misc/lemon.c
author Ryan C. Gordon <icculus@icculus.org>
Fri, 12 Feb 2010 13:40:25 -0500
changeset 829 7b3c3ae9e5a9
parent 809 d0fcadcc93b4
child 830 b15b3c3b5c4a
permissions -rw-r--r--
Lemon now deletes its output on failure. This is to fix the build system. Previously, a Makefile would abort when lemon fails, but on the next run it would see a newer (incorrect/incomplete) output file, and assume it succeeded previously, with disastrous effects for later steps in the build process.
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/*
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 * My changes over the original lemon.c from SQLite are encased in
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 *  #if __MOJOSHADER__ blocks.  --ryan.
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 */
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#define __MOJOSHADER__ 1
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/*
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** This file contains all sources (including headers) to the LEMON
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** LALR(1) parser generator.  The sources have been combined into a
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** single file to make it easy to include LEMON in the source tree
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** and Makefile of another program.
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**
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** The author of this program disclaims copyright.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <assert.h>
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#ifndef __WIN32__
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#   if defined(_WIN32) || defined(WIN32)
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#	define __WIN32__
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#   endif
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#endif
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#ifdef __WIN32__
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extern int access();
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#else
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#include <unistd.h>
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#endif
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/* #define PRIVATE static */
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#define PRIVATE
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#ifdef TEST
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#define MAXRHS 5       /* Set low to exercise exception code */
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#else
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#define MAXRHS 1000
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#endif
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#if __MOJOSHADER__
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static const char **made_files = NULL;
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static int made_files_count = 0;
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static void lemon_exit(const int status)
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{
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    /* if we failed, delete (most) files we made, to unconfuse build tools. */
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    int i;
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    for (i = 0; i < made_files_count; i++) {
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        if (status != 0) {
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            remove(made_files[i]);
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        }
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        free((void *) made_files[i]);
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    }
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    free(made_files);
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    made_files_count = 0;
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    made_files = NULL;
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    exit(status);
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}
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#define exit(x) lemon_exit(x)
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#endif
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static char *msort(char*,char**,int(*)(const char*,const char*));
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/*
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** Compilers are getting increasingly pedantic about type conversions
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** as C evolves ever closer to Ada....  To work around the latest problems
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** we have to define the following variant of strlen().
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*/
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#define lemonStrlen(X)   ((int)strlen(X))
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static struct action *Action_new(void);
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static struct action *Action_sort(struct action *);
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/********** From the file "build.h" ************************************/
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void FindRulePrecedences();
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void FindFirstSets();
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void FindStates();
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void FindLinks();
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void FindFollowSets();
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void FindActions();
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/********* From the file "configlist.h" *********************************/
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void Configlist_init(/* void */);
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struct config *Configlist_add(/* struct rule *, int */);
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struct config *Configlist_addbasis(/* struct rule *, int */);
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void Configlist_closure(/* void */);
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void Configlist_sort(/* void */);
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void Configlist_sortbasis(/* void */);
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struct config *Configlist_return(/* void */);
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struct config *Configlist_basis(/* void */);
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void Configlist_eat(/* struct config * */);
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void Configlist_reset(/* void */);
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/********* From the file "error.h" ***************************************/
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void ErrorMsg(const char *, int,const char *, ...);
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/****** From the file "option.h" ******************************************/
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struct s_options {
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  enum { OPT_FLAG=1,  OPT_INT,  OPT_DBL,  OPT_STR,
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         OPT_FFLAG, OPT_FINT, OPT_FDBL, OPT_FSTR} type;
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  char *label;
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  char *arg;
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  char *message;
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};
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int    OptInit(/* char**,struct s_options*,FILE* */);
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int    OptNArgs(/* void */);
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char  *OptArg(/* int */);
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void   OptErr(/* int */);
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void   OptPrint(/* void */);
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/******** From the file "parse.h" *****************************************/
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void Parse(/* struct lemon *lemp */);
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/********* From the file "plink.h" ***************************************/
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struct plink *Plink_new(/* void */);
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void Plink_add(/* struct plink **, struct config * */);
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void Plink_copy(/* struct plink **, struct plink * */);
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void Plink_delete(/* struct plink * */);
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/********** From the file "report.h" *************************************/
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void Reprint(/* struct lemon * */);
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void ReportOutput(/* struct lemon * */);
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void ReportTable(/* struct lemon * */);
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void ReportHeader(/* struct lemon * */);
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void CompressTables(/* struct lemon * */);
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void ResortStates(/* struct lemon * */);
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/********** From the file "set.h" ****************************************/
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void  SetSize(/* int N */);             /* All sets will be of size N */
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char *SetNew(/* void */);               /* A new set for element 0..N */
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void  SetFree(/* char* */);             /* Deallocate a set */
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int SetAdd(/* char*,int */);            /* Add element to a set */
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int SetUnion(/* char *A,char *B */);    /* A <- A U B, thru element N */
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#define SetFind(X,Y) (X[Y])       /* True if Y is in set X */
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/********** From the file "struct.h" *************************************/
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/*
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** Principal data structures for the LEMON parser generator.
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*/
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typedef enum {LEMON_FALSE=0, LEMON_TRUE} Boolean;
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/* Symbols (terminals and nonterminals) of the grammar are stored
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** in the following: */
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struct symbol {
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  char *name;              /* Name of the symbol */
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  int index;               /* Index number for this symbol */
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  enum {
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    TERMINAL,
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    NONTERMINAL,
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    MULTITERMINAL
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  } type;                  /* Symbols are all either TERMINALS or NTs */
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  struct rule *rule;       /* Linked list of rules of this (if an NT) */
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  struct symbol *fallback; /* fallback token in case this token doesn't parse */
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  int prec;                /* Precedence if defined (-1 otherwise) */
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  enum e_assoc {
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    LEFT,
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    RIGHT,
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    NONE,
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    UNK
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  } assoc;                 /* Associativity if precedence is defined */
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  char *firstset;          /* First-set for all rules of this symbol */
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  Boolean lambda;          /* True if NT and can generate an empty string */
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  int useCnt;              /* Number of times used */
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  char *destructor;        /* Code which executes whenever this symbol is
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                           ** popped from the stack during error processing */
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  int destLineno;          /* Line number for start of destructor */
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  char *datatype;          /* The data type of information held by this
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                           ** object. Only used if type==NONTERMINAL */
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  int dtnum;               /* The data type number.  In the parser, the value
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                           ** stack is a union.  The .yy%d element of this
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                           ** union is the correct data type for this object */
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  /* The following fields are used by MULTITERMINALs only */
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  int nsubsym;             /* Number of constituent symbols in the MULTI */
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  struct symbol **subsym;  /* Array of constituent symbols */
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};
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/* Each production rule in the grammar is stored in the following
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** structure.  */
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struct rule {
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  struct symbol *lhs;      /* Left-hand side of the rule */
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  char *lhsalias;          /* Alias for the LHS (NULL if none) */
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  int lhsStart;            /* True if left-hand side is the start symbol */
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  int ruleline;            /* Line number for the rule */
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  int nrhs;                /* Number of RHS symbols */
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  struct symbol **rhs;     /* The RHS symbols */
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  char **rhsalias;         /* An alias for each RHS symbol (NULL if none) */
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  int line;                /* Line number at which code begins */
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  char *code;              /* The code executed when this rule is reduced */
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  struct symbol *precsym;  /* Precedence symbol for this rule */
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  int index;               /* An index number for this rule */
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  Boolean canReduce;       /* True if this rule is ever reduced */
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  struct rule *nextlhs;    /* Next rule with the same LHS */
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  struct rule *next;       /* Next rule in the global list */
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};
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/* A configuration is a production rule of the grammar together with
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** a mark (dot) showing how much of that rule has been processed so far.
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** Configurations also contain a follow-set which is a list of terminal
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** symbols which are allowed to immediately follow the end of the rule.
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** Every configuration is recorded as an instance of the following: */
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struct config {
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  struct rule *rp;         /* The rule upon which the configuration is based */
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  int dot;                 /* The parse point */
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  char *fws;               /* Follow-set for this configuration only */
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  struct plink *fplp;      /* Follow-set forward propagation links */
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  struct plink *bplp;      /* Follow-set backwards propagation links */
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  struct state *stp;       /* Pointer to state which contains this */
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  enum {
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    COMPLETE,              /* The status is used during followset and */
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    INCOMPLETE             /*    shift computations */
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  } status;
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  struct config *next;     /* Next configuration in the state */
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  struct config *bp;       /* The next basis configuration */
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};
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/* Every shift or reduce operation is stored as one of the following */
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struct action {
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  struct symbol *sp;       /* The look-ahead symbol */
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  enum e_action {
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    SHIFT,
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    ACCEPT,
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    REDUCE,
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    ERROR,
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    SSCONFLICT,              /* A shift/shift conflict */
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    SRCONFLICT,              /* Was a reduce, but part of a conflict */
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    RRCONFLICT,              /* Was a reduce, but part of a conflict */
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    SH_RESOLVED,             /* Was a shift.  Precedence resolved conflict */
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    RD_RESOLVED,             /* Was reduce.  Precedence resolved conflict */
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    NOT_USED                 /* Deleted by compression */
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  } type;
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  union {
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    struct state *stp;     /* The new state, if a shift */
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    struct rule *rp;       /* The rule, if a reduce */
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  } x;
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  struct action *next;     /* Next action for this state */
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  struct action *collide;  /* Next action with the same hash */
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};
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/* Each state of the generated parser's finite state machine
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** is encoded as an instance of the following structure. */
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struct state {
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  struct config *bp;       /* The basis configurations for this state */
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  struct config *cfp;      /* All configurations in this set */
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  int statenum;            /* Sequential number for this state */
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  struct action *ap;       /* Array of actions for this state */
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  int nTknAct, nNtAct;     /* Number of actions on terminals and nonterminals */
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  int iTknOfst, iNtOfst;   /* yy_action[] offset for terminals and nonterms */
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  int iDflt;               /* Default action */
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};
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#define NO_OFFSET (-2147483647)
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/* A followset propagation link indicates that the contents of one
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** configuration followset should be propagated to another whenever
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** the first changes. */
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struct plink {
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  struct config *cfp;      /* The configuration to which linked */
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  struct plink *next;      /* The next propagate link */
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};
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/* The state vector for the entire parser generator is recorded as
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** follows.  (LEMON uses no global variables and makes little use of
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** static variables.  Fields in the following structure can be thought
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** of as begin global variables in the program.) */
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struct lemon {
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  struct state **sorted;   /* Table of states sorted by state number */
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  struct rule *rule;       /* List of all rules */
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  int nstate;              /* Number of states */
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  int nrule;               /* Number of rules */
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  int nsymbol;             /* Number of terminal and nonterminal symbols */
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  int nterminal;           /* Number of terminal symbols */
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  struct symbol **symbols; /* Sorted array of pointers to symbols */
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  int errorcnt;            /* Number of errors */
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  struct symbol *errsym;   /* The error symbol */
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  struct symbol *wildcard; /* Token that matches anything */
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  char *name;              /* Name of the generated parser */
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  char *arg;               /* Declaration of the 3th argument to parser */
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  char *tokentype;         /* Type of terminal symbols in the parser stack */
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  char *vartype;           /* The default type of non-terminal symbols */
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  char *start;             /* Name of the start symbol for the grammar */
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  char *stacksize;         /* Size of the parser stack */
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  char *include;           /* Code to put at the start of the C file */
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  char *error;             /* Code to execute when an error is seen */
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  char *overflow;          /* Code to execute on a stack overflow */
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  char *failure;           /* Code to execute on parser failure */
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  char *accept;            /* Code to execute when the parser excepts */
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  char *extracode;         /* Code appended to the generated file */
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  char *tokendest;         /* Code to execute to destroy token data */
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  char *vardest;           /* Code for the default non-terminal destructor */
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  char *filename;          /* Name of the input file */
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  char *outname;           /* Name of the current output file */
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  char *tokenprefix;       /* A prefix added to token names in the .h file */
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  int nconflict;           /* Number of parsing conflicts */
809
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#if __MOJOSHADER__
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  int nexpected;           /* Number of expected parsing conflicts */
809
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#endif
708
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  int tablesize;           /* Size of the parse tables */
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  int basisflag;           /* Print only basis configurations */
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  int has_fallback;        /* True if any %fallback is seen in the grammar */
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  int nolinenosflag;       /* True if #line statements should not be printed */
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  char *argv0;             /* Name of the program */
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};
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#define MemoryCheck(X) if((X)==0){ \
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  extern void memory_error(); \
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  memory_error(); \
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}
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/**************** From the file "table.h" *********************************/
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/*
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** All code in this file has been automatically generated
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** from a specification in the file
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**              "table.q"
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** by the associative array code building program "aagen".
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** Do not edit this file!  Instead, edit the specification
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** file, then rerun aagen.
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*/
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/*
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** Code for processing tables in the LEMON parser generator.
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*/
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/* Routines for handling a strings */
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char *Strsafe();
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void Strsafe_init(/* void */);
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int Strsafe_insert(/* char * */);
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char *Strsafe_find(/* char * */);
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   333
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/* Routines for handling symbols of the grammar */
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struct symbol *Symbol_new();
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int Symbolcmpp(/* struct symbol **, struct symbol ** */);
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void Symbol_init(/* void */);
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int Symbol_insert(/* struct symbol *, char * */);
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struct symbol *Symbol_find(/* char * */);
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struct symbol *Symbol_Nth(/* int */);
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int Symbol_count(/*  */);
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struct symbol **Symbol_arrayof(/*  */);
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   344
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/* Routines to manage the state table */
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   346
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int Configcmp(/* struct config *, struct config * */);
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struct state *State_new();
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   349
void State_init(/* void */);
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int State_insert(/* struct state *, struct config * */);
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struct state *State_find(/* struct config * */);
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struct state **State_arrayof(/*  */);
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   353
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   354
/* Routines used for efficiency in Configlist_add */
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   355
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   356
void Configtable_init(/* void */);
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int Configtable_insert(/* struct config * */);
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struct config *Configtable_find(/* struct config * */);
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void Configtable_clear(/* int(*)(struct config *) */);
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/****************** From the file "action.c" *******************************/
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/*
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** Routines processing parser actions in the LEMON parser generator.
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   363
*/
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   364
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   365
/* Allocate a new parser action */
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static struct action *Action_new(void){
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  static struct action *freelist = 0;
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   368
  struct action *new;
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   369
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   370
  if( freelist==0 ){
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   371
    int i;
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   372
    int amt = 100;
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   373
    freelist = (struct action *)calloc(amt, sizeof(struct action));
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   374
    if( freelist==0 ){
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   375
      fprintf(stderr,"Unable to allocate memory for a new parser action.");
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   376
      exit(1);
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   377
    }
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   378
    for(i=0; i<amt-1; i++) freelist[i].next = &freelist[i+1];
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   379
    freelist[amt-1].next = 0;
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   380
  }
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   381
  new = freelist;
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   382
  freelist = freelist->next;
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   383
  return new;
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   384
}
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   385
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   386
/* Compare two actions for sorting purposes.  Return negative, zero, or
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   387
** positive if the first action is less than, equal to, or greater than
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   388
** the first
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   389
*/
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   390
static int actioncmp(
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   391
  struct action *ap1,
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   392
  struct action *ap2
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   393
){
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   394
  int rc;
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   395
  rc = ap1->sp->index - ap2->sp->index;
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   396
  if( rc==0 ){
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   397
    rc = (int)ap1->type - (int)ap2->type;
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   398
  }
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   399
  if( rc==0 && ap1->type==REDUCE ){
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   400
    rc = ap1->x.rp->index - ap2->x.rp->index;
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diff changeset
   401
  }
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   402
  return rc;
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parents:
diff changeset
   403
}
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diff changeset
   404
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   405
/* Sort parser actions */
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diff changeset
   406
static struct action *Action_sort(
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   407
  struct action *ap
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   408
){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   409
  ap = (struct action *)msort((char *)ap,(char **)&ap->next,
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   410
                              (int(*)(const char*,const char*))actioncmp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   411
  return ap;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   412
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   413
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   414
void Action_add(app,type,sp,arg)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   415
struct action **app;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   416
enum e_action type;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   417
struct symbol *sp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   418
char *arg;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   419
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   420
  struct action *new;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   421
  new = Action_new();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   422
  new->next = *app;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   423
  *app = new;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   424
  new->type = type;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   425
  new->sp = sp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   426
  if( type==SHIFT ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   427
    new->x.stp = (struct state *)arg;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   428
  }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   429
    new->x.rp = (struct rule *)arg;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   430
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   431
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   432
/********************** New code to implement the "acttab" module ***********/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   433
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   434
** This module implements routines use to construct the yy_action[] table.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   435
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   436
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   437
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   438
** The state of the yy_action table under construction is an instance of
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   439
** the following structure
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   440
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   441
typedef struct acttab acttab;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   442
struct acttab {
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   443
  int nAction;                 /* Number of used slots in aAction[] */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   444
  int nActionAlloc;            /* Slots allocated for aAction[] */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   445
  struct {
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   446
    int lookahead;             /* Value of the lookahead token */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   447
    int action;                /* Action to take on the given lookahead */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   448
  } *aAction,                  /* The yy_action[] table under construction */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   449
    *aLookahead;               /* A single new transaction set */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   450
  int mnLookahead;             /* Minimum aLookahead[].lookahead */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   451
  int mnAction;                /* Action associated with mnLookahead */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   452
  int mxLookahead;             /* Maximum aLookahead[].lookahead */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   453
  int nLookahead;              /* Used slots in aLookahead[] */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   454
  int nLookaheadAlloc;         /* Slots allocated in aLookahead[] */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   455
};
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   456
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   457
/* Return the number of entries in the yy_action table */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   458
#define acttab_size(X) ((X)->nAction)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   459
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   460
/* The value for the N-th entry in yy_action */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   461
#define acttab_yyaction(X,N)  ((X)->aAction[N].action)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   462
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   463
/* The value for the N-th entry in yy_lookahead */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   464
#define acttab_yylookahead(X,N)  ((X)->aAction[N].lookahead)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   465
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   466
/* Free all memory associated with the given acttab */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   467
void acttab_free(acttab *p){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   468
  free( p->aAction );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   469
  free( p->aLookahead );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   470
  free( p );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   471
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   472
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   473
/* Allocate a new acttab structure */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   474
acttab *acttab_alloc(void){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   475
  acttab *p = calloc( 1, sizeof(*p) );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   476
  if( p==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   477
    fprintf(stderr,"Unable to allocate memory for a new acttab.");
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   478
    exit(1);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   479
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   480
  memset(p, 0, sizeof(*p));
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   481
  return p;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   482
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   483
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   484
/* Add a new action to the current transaction set
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   485
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   486
void acttab_action(acttab *p, int lookahead, int action){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   487
  if( p->nLookahead>=p->nLookaheadAlloc ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   488
    p->nLookaheadAlloc += 25;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   489
    p->aLookahead = realloc( p->aLookahead,
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   490
                             sizeof(p->aLookahead[0])*p->nLookaheadAlloc );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   491
    if( p->aLookahead==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   492
      fprintf(stderr,"malloc failed\n");
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   493
      exit(1);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   494
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   495
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   496
  if( p->nLookahead==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   497
    p->mxLookahead = lookahead;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   498
    p->mnLookahead = lookahead;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   499
    p->mnAction = action;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   500
  }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   501
    if( p->mxLookahead<lookahead ) p->mxLookahead = lookahead;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   502
    if( p->mnLookahead>lookahead ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   503
      p->mnLookahead = lookahead;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   504
      p->mnAction = action;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   505
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   506
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   507
  p->aLookahead[p->nLookahead].lookahead = lookahead;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   508
  p->aLookahead[p->nLookahead].action = action;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   509
  p->nLookahead++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   510
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   511
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   512
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   513
** Add the transaction set built up with prior calls to acttab_action()
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   514
** into the current action table.  Then reset the transaction set back
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   515
** to an empty set in preparation for a new round of acttab_action() calls.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   516
**
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   517
** Return the offset into the action table of the new transaction.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   518
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   519
int acttab_insert(acttab *p){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   520
  int i, j, k, n;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   521
  assert( p->nLookahead>0 );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   522
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   523
  /* Make sure we have enough space to hold the expanded action table
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   524
  ** in the worst case.  The worst case occurs if the transaction set
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   525
  ** must be appended to the current action table
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   526
  */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   527
  n = p->mxLookahead + 1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   528
  if( p->nAction + n >= p->nActionAlloc ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   529
    int oldAlloc = p->nActionAlloc;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   530
    p->nActionAlloc = p->nAction + n + p->nActionAlloc + 20;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   531
    p->aAction = realloc( p->aAction,
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   532
                          sizeof(p->aAction[0])*p->nActionAlloc);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   533
    if( p->aAction==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   534
      fprintf(stderr,"malloc failed\n");
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   535
      exit(1);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   536
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   537
    for(i=oldAlloc; i<p->nActionAlloc; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   538
      p->aAction[i].lookahead = -1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   539
      p->aAction[i].action = -1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   540
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   541
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   542
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   543
  /* Scan the existing action table looking for an offset where we can
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   544
  ** insert the current transaction set.  Fall out of the loop when that
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   545
  ** offset is found.  In the worst case, we fall out of the loop when
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   546
  ** i reaches p->nAction, which means we append the new transaction set.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   547
  **
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   548
  ** i is the index in p->aAction[] where p->mnLookahead is inserted.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   549
  */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   550
  for(i=0; i<p->nAction+p->mnLookahead; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   551
    if( p->aAction[i].lookahead<0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   552
      for(j=0; j<p->nLookahead; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   553
        k = p->aLookahead[j].lookahead - p->mnLookahead + i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   554
        if( k<0 ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   555
        if( p->aAction[k].lookahead>=0 ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   556
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   557
      if( j<p->nLookahead ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   558
      for(j=0; j<p->nAction; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   559
        if( p->aAction[j].lookahead==j+p->mnLookahead-i ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   560
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   561
      if( j==p->nAction ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   562
        break;  /* Fits in empty slots */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   563
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   564
    }else if( p->aAction[i].lookahead==p->mnLookahead ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   565
      if( p->aAction[i].action!=p->mnAction ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   566
      for(j=0; j<p->nLookahead; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   567
        k = p->aLookahead[j].lookahead - p->mnLookahead + i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   568
        if( k<0 || k>=p->nAction ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   569
        if( p->aLookahead[j].lookahead!=p->aAction[k].lookahead ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   570
        if( p->aLookahead[j].action!=p->aAction[k].action ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   571
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   572
      if( j<p->nLookahead ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   573
      n = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   574
      for(j=0; j<p->nAction; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   575
        if( p->aAction[j].lookahead<0 ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   576
        if( p->aAction[j].lookahead==j+p->mnLookahead-i ) n++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   577
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   578
      if( n==p->nLookahead ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   579
        break;  /* Same as a prior transaction set */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   580
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   581
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   582
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   583
  /* Insert transaction set at index i. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   584
  for(j=0; j<p->nLookahead; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   585
    k = p->aLookahead[j].lookahead - p->mnLookahead + i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   586
    p->aAction[k] = p->aLookahead[j];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   587
    if( k>=p->nAction ) p->nAction = k+1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   588
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   589
  p->nLookahead = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   590
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   591
  /* Return the offset that is added to the lookahead in order to get the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   592
  ** index into yy_action of the action */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   593
  return i - p->mnLookahead;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   594
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   595
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   596
/********************** From the file "build.c" *****************************/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   597
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   598
** Routines to construction the finite state machine for the LEMON
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   599
** parser generator.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   600
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   601
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   602
/* Find a precedence symbol of every rule in the grammar.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   603
** 
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   604
** Those rules which have a precedence symbol coded in the input
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   605
** grammar using the "[symbol]" construct will already have the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   606
** rp->precsym field filled.  Other rules take as their precedence
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   607
** symbol the first RHS symbol with a defined precedence.  If there
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   608
** are not RHS symbols with a defined precedence, the precedence
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   609
** symbol field is left blank.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   610
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   611
void FindRulePrecedences(xp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   612
struct lemon *xp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   613
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   614
  struct rule *rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   615
  for(rp=xp->rule; rp; rp=rp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   616
    if( rp->precsym==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   617
      int i, j;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   618
      for(i=0; i<rp->nrhs && rp->precsym==0; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   619
        struct symbol *sp = rp->rhs[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   620
        if( sp->type==MULTITERMINAL ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   621
          for(j=0; j<sp->nsubsym; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   622
            if( sp->subsym[j]->prec>=0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   623
              rp->precsym = sp->subsym[j];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   624
              break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   625
            }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   626
          }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   627
        }else if( sp->prec>=0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   628
          rp->precsym = rp->rhs[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   629
	}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   630
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   631
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   632
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   633
  return;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   634
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   635
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   636
/* Find all nonterminals which will generate the empty string.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   637
** Then go back and compute the first sets of every nonterminal.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   638
** The first set is the set of all terminal symbols which can begin
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   639
** a string generated by that nonterminal.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   640
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   641
void FindFirstSets(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   642
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   643
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   644
  int i, j;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   645
  struct rule *rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   646
  int progress;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   647
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   648
  for(i=0; i<lemp->nsymbol; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   649
    lemp->symbols[i]->lambda = LEMON_FALSE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   650
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   651
  for(i=lemp->nterminal; i<lemp->nsymbol; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   652
    lemp->symbols[i]->firstset = SetNew();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   653
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   654
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   655
  /* First compute all lambdas */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   656
  do{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   657
    progress = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   658
    for(rp=lemp->rule; rp; rp=rp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   659
      if( rp->lhs->lambda ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   660
      for(i=0; i<rp->nrhs; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   661
         struct symbol *sp = rp->rhs[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   662
         if( sp->type!=TERMINAL || sp->lambda==LEMON_FALSE ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   663
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   664
      if( i==rp->nrhs ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   665
        rp->lhs->lambda = LEMON_TRUE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   666
        progress = 1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   667
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   668
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   669
  }while( progress );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   670
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   671
  /* Now compute all first sets */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   672
  do{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   673
    struct symbol *s1, *s2;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   674
    progress = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   675
    for(rp=lemp->rule; rp; rp=rp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   676
      s1 = rp->lhs;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   677
      for(i=0; i<rp->nrhs; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   678
        s2 = rp->rhs[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   679
        if( s2->type==TERMINAL ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   680
          progress += SetAdd(s1->firstset,s2->index);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   681
          break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   682
        }else if( s2->type==MULTITERMINAL ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   683
          for(j=0; j<s2->nsubsym; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   684
            progress += SetAdd(s1->firstset,s2->subsym[j]->index);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   685
          }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   686
          break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   687
	}else if( s1==s2 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   688
          if( s1->lambda==LEMON_FALSE ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   689
	}else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   690
          progress += SetUnion(s1->firstset,s2->firstset);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   691
          if( s2->lambda==LEMON_FALSE ) break;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   692
	}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   693
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   694
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   695
  }while( progress );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   696
  return;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   697
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   698
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   699
/* Compute all LR(0) states for the grammar.  Links
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   700
** are added to between some states so that the LR(1) follow sets
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   701
** can be computed later.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   702
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   703
PRIVATE struct state *getstate(/* struct lemon * */);  /* forward reference */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   704
void FindStates(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   705
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   706
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   707
  struct symbol *sp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   708
  struct rule *rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   709
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   710
  Configlist_init();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   711
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   712
  /* Find the start symbol */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   713
  if( lemp->start ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   714
    sp = Symbol_find(lemp->start);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   715
    if( sp==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   716
      ErrorMsg(lemp->filename,0,
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   717
"The specified start symbol \"%s\" is not \
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   718
in a nonterminal of the grammar.  \"%s\" will be used as the start \
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   719
symbol instead.",lemp->start,lemp->rule->lhs->name);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   720
      lemp->errorcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   721
      sp = lemp->rule->lhs;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   722
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   723
  }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   724
    sp = lemp->rule->lhs;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   725
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   726
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   727
  /* Make sure the start symbol doesn't occur on the right-hand side of
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   728
  ** any rule.  Report an error if it does.  (YACC would generate a new
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   729
  ** start symbol in this case.) */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   730
  for(rp=lemp->rule; rp; rp=rp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   731
    int i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   732
    for(i=0; i<rp->nrhs; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   733
      if( rp->rhs[i]==sp ){   /* FIX ME:  Deal with multiterminals */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   734
        ErrorMsg(lemp->filename,0,
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   735
"The start symbol \"%s\" occurs on the \
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   736
right-hand side of a rule. This will result in a parser which \
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   737
does not work properly.",sp->name);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   738
        lemp->errorcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   739
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   740
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   741
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   742
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   743
  /* The basis configuration set for the first state
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   744
  ** is all rules which have the start symbol as their
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   745
  ** left-hand side */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   746
  for(rp=sp->rule; rp; rp=rp->nextlhs){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   747
    struct config *newcfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   748
    rp->lhsStart = 1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   749
    newcfp = Configlist_addbasis(rp,0);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   750
    SetAdd(newcfp->fws,0);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   751
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   752
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   753
  /* Compute the first state.  All other states will be
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   754
  ** computed automatically during the computation of the first one.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   755
  ** The returned pointer to the first state is not used. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   756
  (void)getstate(lemp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   757
  return;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   758
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   759
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   760
/* Return a pointer to a state which is described by the configuration
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   761
** list which has been built from calls to Configlist_add.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   762
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   763
PRIVATE void buildshifts(/* struct lemon *, struct state * */); /* Forwd ref */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   764
PRIVATE struct state *getstate(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   765
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   766
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   767
  struct config *cfp, *bp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   768
  struct state *stp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   769
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   770
  /* Extract the sorted basis of the new state.  The basis was constructed
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   771
  ** by prior calls to "Configlist_addbasis()". */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   772
  Configlist_sortbasis();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   773
  bp = Configlist_basis();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   774
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   775
  /* Get a state with the same basis */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   776
  stp = State_find(bp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   777
  if( stp ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   778
    /* A state with the same basis already exists!  Copy all the follow-set
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   779
    ** propagation links from the state under construction into the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   780
    ** preexisting state, then return a pointer to the preexisting state */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   781
    struct config *x, *y;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   782
    for(x=bp, y=stp->bp; x && y; x=x->bp, y=y->bp){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   783
      Plink_copy(&y->bplp,x->bplp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   784
      Plink_delete(x->fplp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   785
      x->fplp = x->bplp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   786
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   787
    cfp = Configlist_return();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   788
    Configlist_eat(cfp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   789
  }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   790
    /* This really is a new state.  Construct all the details */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   791
    Configlist_closure(lemp);    /* Compute the configuration closure */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   792
    Configlist_sort();           /* Sort the configuration closure */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   793
    cfp = Configlist_return();   /* Get a pointer to the config list */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   794
    stp = State_new();           /* A new state structure */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   795
    MemoryCheck(stp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   796
    stp->bp = bp;                /* Remember the configuration basis */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   797
    stp->cfp = cfp;              /* Remember the configuration closure */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   798
    stp->statenum = lemp->nstate++; /* Every state gets a sequence number */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   799
    stp->ap = 0;                 /* No actions, yet. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   800
    State_insert(stp,stp->bp);   /* Add to the state table */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   801
    buildshifts(lemp,stp);       /* Recursively compute successor states */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   802
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   803
  return stp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   804
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   805
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   806
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   807
** Return true if two symbols are the same.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   808
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   809
int same_symbol(a,b)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   810
struct symbol *a;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   811
struct symbol *b;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   812
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   813
  int i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   814
  if( a==b ) return 1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   815
  if( a->type!=MULTITERMINAL ) return 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   816
  if( b->type!=MULTITERMINAL ) return 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   817
  if( a->nsubsym!=b->nsubsym ) return 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   818
  for(i=0; i<a->nsubsym; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   819
    if( a->subsym[i]!=b->subsym[i] ) return 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   820
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   821
  return 1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   822
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   823
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   824
/* Construct all successor states to the given state.  A "successor"
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   825
** state is any state which can be reached by a shift action.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   826
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   827
PRIVATE void buildshifts(lemp,stp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   828
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   829
struct state *stp;     /* The state from which successors are computed */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   830
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   831
  struct config *cfp;  /* For looping thru the config closure of "stp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   832
  struct config *bcfp; /* For the inner loop on config closure of "stp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   833
  struct config *new;  /* */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   834
  struct symbol *sp;   /* Symbol following the dot in configuration "cfp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   835
  struct symbol *bsp;  /* Symbol following the dot in configuration "bcfp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   836
  struct state *newstp; /* A pointer to a successor state */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   837
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   838
  /* Each configuration becomes complete after it contibutes to a successor
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   839
  ** state.  Initially, all configurations are incomplete */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   840
  for(cfp=stp->cfp; cfp; cfp=cfp->next) cfp->status = INCOMPLETE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   841
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   842
  /* Loop through all configurations of the state "stp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   843
  for(cfp=stp->cfp; cfp; cfp=cfp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   844
    if( cfp->status==COMPLETE ) continue;    /* Already used by inner loop */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   845
    if( cfp->dot>=cfp->rp->nrhs ) continue;  /* Can't shift this config */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   846
    Configlist_reset();                      /* Reset the new config set */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   847
    sp = cfp->rp->rhs[cfp->dot];             /* Symbol after the dot */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   848
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   849
    /* For every configuration in the state "stp" which has the symbol "sp"
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   850
    ** following its dot, add the same configuration to the basis set under
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   851
    ** construction but with the dot shifted one symbol to the right. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   852
    for(bcfp=cfp; bcfp; bcfp=bcfp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   853
      if( bcfp->status==COMPLETE ) continue;    /* Already used */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   854
      if( bcfp->dot>=bcfp->rp->nrhs ) continue; /* Can't shift this one */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   855
      bsp = bcfp->rp->rhs[bcfp->dot];           /* Get symbol after dot */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   856
      if( !same_symbol(bsp,sp) ) continue;      /* Must be same as for "cfp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   857
      bcfp->status = COMPLETE;                  /* Mark this config as used */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   858
      new = Configlist_addbasis(bcfp->rp,bcfp->dot+1);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   859
      Plink_add(&new->bplp,bcfp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   860
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   861
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   862
    /* Get a pointer to the state described by the basis configuration set
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   863
    ** constructed in the preceding loop */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   864
    newstp = getstate(lemp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   865
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   866
    /* The state "newstp" is reached from the state "stp" by a shift action
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   867
    ** on the symbol "sp" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   868
    if( sp->type==MULTITERMINAL ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   869
      int i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   870
      for(i=0; i<sp->nsubsym; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   871
        Action_add(&stp->ap,SHIFT,sp->subsym[i],(char*)newstp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   872
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   873
    }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   874
      Action_add(&stp->ap,SHIFT,sp,(char *)newstp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   875
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   876
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   877
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   878
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   879
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   880
** Construct the propagation links
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   881
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   882
void FindLinks(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   883
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   884
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   885
  int i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   886
  struct config *cfp, *other;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   887
  struct state *stp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   888
  struct plink *plp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   889
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   890
  /* Housekeeping detail:
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   891
  ** Add to every propagate link a pointer back to the state to
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   892
  ** which the link is attached. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   893
  for(i=0; i<lemp->nstate; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   894
    stp = lemp->sorted[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   895
    for(cfp=stp->cfp; cfp; cfp=cfp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   896
      cfp->stp = stp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   897
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   898
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   899
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   900
  /* Convert all backlinks into forward links.  Only the forward
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   901
  ** links are used in the follow-set computation. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   902
  for(i=0; i<lemp->nstate; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   903
    stp = lemp->sorted[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   904
    for(cfp=stp->cfp; cfp; cfp=cfp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   905
      for(plp=cfp->bplp; plp; plp=plp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   906
        other = plp->cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   907
        Plink_add(&other->fplp,cfp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   908
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   909
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   910
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   911
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   912
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   913
/* Compute all followsets.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   914
**
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   915
** A followset is the set of all symbols which can come immediately
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   916
** after a configuration.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   917
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   918
void FindFollowSets(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   919
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   920
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   921
  int i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   922
  struct config *cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   923
  struct plink *plp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   924
  int progress;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   925
  int change;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   926
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   927
  for(i=0; i<lemp->nstate; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   928
    for(cfp=lemp->sorted[i]->cfp; cfp; cfp=cfp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   929
      cfp->status = INCOMPLETE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   930
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   931
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   932
  
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   933
  do{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   934
    progress = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   935
    for(i=0; i<lemp->nstate; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   936
      for(cfp=lemp->sorted[i]->cfp; cfp; cfp=cfp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   937
        if( cfp->status==COMPLETE ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   938
        for(plp=cfp->fplp; plp; plp=plp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   939
          change = SetUnion(plp->cfp->fws,cfp->fws);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   940
          if( change ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   941
            plp->cfp->status = INCOMPLETE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   942
            progress = 1;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   943
	  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   944
	}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   945
        cfp->status = COMPLETE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   946
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   947
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   948
  }while( progress );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   949
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   950
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   951
static int resolve_conflict();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   952
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   953
/* Compute the reduce actions, and resolve conflicts.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   954
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   955
void FindActions(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   956
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   957
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   958
  int i,j;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   959
  struct config *cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   960
  struct state *stp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   961
  struct symbol *sp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   962
  struct rule *rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   963
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   964
  /* Add all of the reduce actions 
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   965
  ** A reduce action is added for each element of the followset of
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   966
  ** a configuration which has its dot at the extreme right.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   967
  */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   968
  for(i=0; i<lemp->nstate; i++){   /* Loop over all states */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   969
    stp = lemp->sorted[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   970
    for(cfp=stp->cfp; cfp; cfp=cfp->next){  /* Loop over all configurations */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   971
      if( cfp->rp->nrhs==cfp->dot ){        /* Is dot at extreme right? */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   972
        for(j=0; j<lemp->nterminal; j++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   973
          if( SetFind(cfp->fws,j) ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   974
            /* Add a reduce action to the state "stp" which will reduce by the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   975
            ** rule "cfp->rp" if the lookahead symbol is "lemp->symbols[j]" */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   976
            Action_add(&stp->ap,REDUCE,lemp->symbols[j],(char *)cfp->rp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   977
          }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   978
	}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   979
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   980
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   981
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   982
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   983
  /* Add the accepting token */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   984
  if( lemp->start ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   985
    sp = Symbol_find(lemp->start);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   986
    if( sp==0 ) sp = lemp->rule->lhs;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   987
  }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   988
    sp = lemp->rule->lhs;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   989
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   990
  /* Add to the first state (which is always the starting state of the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   991
  ** finite state machine) an action to ACCEPT if the lookahead is the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   992
  ** start nonterminal.  */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   993
  Action_add(&lemp->sorted[0]->ap,ACCEPT,sp,0);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   994
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   995
  /* Resolve conflicts */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   996
  for(i=0; i<lemp->nstate; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   997
    struct action *ap, *nap;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   998
    struct state *stp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   999
    stp = lemp->sorted[i];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1000
    /* assert( stp->ap ); */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1001
    stp->ap = Action_sort(stp->ap);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1002
    for(ap=stp->ap; ap && ap->next; ap=ap->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1003
      for(nap=ap->next; nap && nap->sp==ap->sp; nap=nap->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1004
         /* The two actions "ap" and "nap" have the same lookahead.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1005
         ** Figure out which one should be used */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1006
         lemp->nconflict += resolve_conflict(ap,nap,lemp->errsym);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1007
      }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1008
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1009
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1010
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1011
  /* Report an error for each rule that can never be reduced. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1012
  for(rp=lemp->rule; rp; rp=rp->next) rp->canReduce = LEMON_FALSE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1013
  for(i=0; i<lemp->nstate; i++){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1014
    struct action *ap;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1015
    for(ap=lemp->sorted[i]->ap; ap; ap=ap->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1016
      if( ap->type==REDUCE ) ap->x.rp->canReduce = LEMON_TRUE;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1017
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1018
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1019
  for(rp=lemp->rule; rp; rp=rp->next){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1020
    if( rp->canReduce ) continue;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1021
    ErrorMsg(lemp->filename,rp->ruleline,"This rule can not be reduced.\n");
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1022
    lemp->errorcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1023
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1024
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1025
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1026
/* Resolve a conflict between the two given actions.  If the
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1027
** conflict can't be resolved, return non-zero.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1028
**
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1029
** NO LONGER TRUE:
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1030
**   To resolve a conflict, first look to see if either action
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1031
**   is on an error rule.  In that case, take the action which
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1032
**   is not associated with the error rule.  If neither or both
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1033
**   actions are associated with an error rule, then try to
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1034
**   use precedence to resolve the conflict.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1035
**
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1036
** If either action is a SHIFT, then it must be apx.  This
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1037
** function won't work if apx->type==REDUCE and apy->type==SHIFT.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1038
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1039
static int resolve_conflict(apx,apy,errsym)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1040
struct action *apx;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1041
struct action *apy;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1042
struct symbol *errsym;   /* The error symbol (if defined.  NULL otherwise) */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1043
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1044
  struct symbol *spx, *spy;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1045
  int errcnt = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1046
  assert( apx->sp==apy->sp );  /* Otherwise there would be no conflict */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1047
  if( apx->type==SHIFT && apy->type==SHIFT ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1048
    apy->type = SSCONFLICT;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1049
    errcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1050
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1051
  if( apx->type==SHIFT && apy->type==REDUCE ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1052
    spx = apx->sp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1053
    spy = apy->x.rp->precsym;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1054
    if( spy==0 || spx->prec<0 || spy->prec<0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1055
      /* Not enough precedence information. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1056
      apy->type = SRCONFLICT;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1057
      errcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1058
    }else if( spx->prec>spy->prec ){    /* Lower precedence wins */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1059
      apy->type = RD_RESOLVED;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1060
    }else if( spx->prec<spy->prec ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1061
      apx->type = SH_RESOLVED;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1062
    }else if( spx->prec==spy->prec && spx->assoc==RIGHT ){ /* Use operator */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1063
      apy->type = RD_RESOLVED;                             /* associativity */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1064
    }else if( spx->prec==spy->prec && spx->assoc==LEFT ){  /* to break tie */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1065
      apx->type = SH_RESOLVED;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1066
    }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1067
      assert( spx->prec==spy->prec && spx->assoc==NONE );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1068
      apy->type = SRCONFLICT;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1069
      errcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1070
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1071
  }else if( apx->type==REDUCE && apy->type==REDUCE ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1072
    spx = apx->x.rp->precsym;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1073
    spy = apy->x.rp->precsym;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1074
    if( spx==0 || spy==0 || spx->prec<0 ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1075
    spy->prec<0 || spx->prec==spy->prec ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1076
      apy->type = RRCONFLICT;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1077
      errcnt++;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1078
    }else if( spx->prec>spy->prec ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1079
      apy->type = RD_RESOLVED;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1080
    }else if( spx->prec<spy->prec ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1081
      apx->type = RD_RESOLVED;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1082
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1083
  }else{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1084
    assert( 
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1085
      apx->type==SH_RESOLVED ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1086
      apx->type==RD_RESOLVED ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1087
      apx->type==SSCONFLICT ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1088
      apx->type==SRCONFLICT ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1089
      apx->type==RRCONFLICT ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1090
      apy->type==SH_RESOLVED ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1091
      apy->type==RD_RESOLVED ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1092
      apy->type==SSCONFLICT ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1093
      apy->type==SRCONFLICT ||
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1094
      apy->type==RRCONFLICT
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1095
    );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1096
    /* The REDUCE/SHIFT case cannot happen because SHIFTs come before
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1097
    ** REDUCEs on the list.  If we reach this point it must be because
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1098
    ** the parser conflict had already been resolved. */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1099
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1100
  return errcnt;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1101
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1102
/********************* From the file "configlist.c" *************************/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1103
/*
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1104
** Routines to processing a configuration list and building a state
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1105
** in the LEMON parser generator.
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1106
*/
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1107
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1108
static struct config *freelist = 0;      /* List of free configurations */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1109
static struct config *current = 0;       /* Top of list of configurations */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1110
static struct config **currentend = 0;   /* Last on list of configs */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1111
static struct config *basis = 0;         /* Top of list of basis configs */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1112
static struct config **basisend = 0;     /* End of list of basis configs */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1113
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1114
/* Return a pointer to a new configuration */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1115
PRIVATE struct config *newconfig(){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1116
  struct config *new;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1117
  if( freelist==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1118
    int i;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1119
    int amt = 3;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1120
    freelist = (struct config *)calloc( amt, sizeof(struct config) );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1121
    if( freelist==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1122
      fprintf(stderr,"Unable to allocate memory for a new configuration.");
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1123
      exit(1);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1124
    }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1125
    for(i=0; i<amt-1; i++) freelist[i].next = &freelist[i+1];
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1126
    freelist[amt-1].next = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1127
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1128
  new = freelist;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1129
  freelist = freelist->next;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1130
  return new;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1131
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1132
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1133
/* The configuration "old" is no longer used */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1134
PRIVATE void deleteconfig(old)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1135
struct config *old;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1136
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1137
  old->next = freelist;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1138
  freelist = old;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1139
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1140
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1141
/* Initialized the configuration list builder */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1142
void Configlist_init(){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1143
  current = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1144
  currentend = &current;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1145
  basis = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1146
  basisend = &basis;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1147
  Configtable_init();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1148
  return;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1149
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1150
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1151
/* Initialized the configuration list builder */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1152
void Configlist_reset(){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1153
  current = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1154
  currentend = &current;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1155
  basis = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1156
  basisend = &basis;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1157
  Configtable_clear(0);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1158
  return;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1159
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1160
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1161
/* Add another configuration to the configuration list */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1162
struct config *Configlist_add(rp,dot)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1163
struct rule *rp;    /* The rule */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1164
int dot;            /* Index into the RHS of the rule where the dot goes */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1165
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1166
  struct config *cfp, model;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1167
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1168
  assert( currentend!=0 );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1169
  model.rp = rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1170
  model.dot = dot;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1171
  cfp = Configtable_find(&model);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1172
  if( cfp==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1173
    cfp = newconfig();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1174
    cfp->rp = rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1175
    cfp->dot = dot;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1176
    cfp->fws = SetNew();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1177
    cfp->stp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1178
    cfp->fplp = cfp->bplp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1179
    cfp->next = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1180
    cfp->bp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1181
    *currentend = cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1182
    currentend = &cfp->next;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1183
    Configtable_insert(cfp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1184
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1185
  return cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1186
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1187
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1188
/* Add a basis configuration to the configuration list */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1189
struct config *Configlist_addbasis(rp,dot)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1190
struct rule *rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1191
int dot;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1192
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1193
  struct config *cfp, model;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1194
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1195
  assert( basisend!=0 );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1196
  assert( currentend!=0 );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1197
  model.rp = rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1198
  model.dot = dot;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1199
  cfp = Configtable_find(&model);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1200
  if( cfp==0 ){
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1201
    cfp = newconfig();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1202
    cfp->rp = rp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1203
    cfp->dot = dot;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1204
    cfp->fws = SetNew();
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1205
    cfp->stp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1206
    cfp->fplp = cfp->bplp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1207
    cfp->next = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1208
    cfp->bp = 0;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1209
    *currentend = cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1210
    currentend = &cfp->next;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1211
    *basisend = cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1212
    basisend = &cfp->bp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1213
    Configtable_insert(cfp);
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1214
  }
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1215
  return cfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1216
}
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1217
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1218
/* Compute the closure of the configuration list */
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1219
void Configlist_closure(lemp)
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1220
struct lemon *lemp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1221
{
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1222
  struct config *cfp, *newcfp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1223
  struct rule *rp, *newrp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1224
  struct symbol *sp, *xsp;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1225
  int i, dot;
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1226
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1227
  assert( currentend!=0 );
d29c193900b0 Added lemon and lempar sources to revision control.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
  1228
  for(cfp=current; cfp; cfp=cfp->next){