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mojoshader_lexer.re
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mojoshader_lexer.re
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/**
* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
// This was originally based on examples/pp-c.re from re2c: http://re2c.org/
// re2c is public domain code.
//
// You build mojoshader_lexer_preprocessor.c from the .re file with re2c...
// re2c -is -o mojoshader_lexer_preprocessor.c mojoshader_lexer_preprocessor.re
//
// Changes to the lexer are done to the .re file, not the C code!
//
// Please note that this isn't a perfect C lexer, since it is used for both
// HLSL and shader assembly language, and follows the quirks of Microsoft's
// tools.
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
typedef unsigned char uchar;
#define RET(t) do { update_state(s, cursor, token); return t; } while (0)
#define YYCTYPE uchar
#define YYCURSOR cursor
#define YYLIMIT limit
#define YYMARKER s->lexer_marker
#define YYFILL(n) { if ((n) == 1) { RET(TOKEN_EOI); } }
static void update_state(IncludeState *s, const uchar *cur, const uchar *tok)
{
s->bytes_left -= (unsigned int) (cur - ((const uchar *) s->source));
s->source = (const char *) cur;
s->token = (const char *) tok;
} // update_state
Token preprocessor_internal_lexer(IncludeState *s)
{
const uchar *cursor = (const uchar *) s->source;
const uchar *token;
const uchar *limit = cursor + s->bytes_left;
int saw_newline = 0;
scanner_loop:
token = cursor;
if (YYLIMIT == YYCURSOR)
RET(TOKEN_EOI);
/*!re2c
any = [\000-\377];
O = [0-7];
D = [0-9];
L = [a-zA-Z_];
H = [a-fA-F0-9];
E = [Ee] [+-]? D+;
FS = [fFlL];
IS = [uUlL]*;
ESC = [\\] ([abfnrtv?'"\\] | "x" H+ | O+);
PP = "#" [ \t]*;
NEWLINE = "\r\n" | "\r" | "\n";
WHITESPACE = [ \t\v\f]+;
*/
/*!re2c
"/*" { goto multilinecomment; }
"//" { goto singlelinecomment; }
L (L|D)* { RET(TOKEN_IDENTIFIER); }
("0" [xX] H+ IS?) | ("0" D+ IS?) | (D+ IS?) |
(['] (ESC|any\[\n\\'])* ['])
{ RET(TOKEN_INT_LITERAL); }
(D+ E FS?) | (D* "." D+ E? FS?) | (D+ "." D* E? FS?)
{ RET(TOKEN_FLOAT_LITERAL); }
(["] (ESC|any\[\n\\"])* ["])
{ RET(TOKEN_STRING_LITERAL); }
"..." { RET(TOKEN_ELLIPSIS); }
">>" { RET(TOKEN_RSHIFT); }
"<<" { RET(TOKEN_LSHIFT); }
"&&" { RET(TOKEN_ANDAND); }
"||" { RET(TOKEN_OROR); }
"<=" { RET(TOKEN_LEQ); }
">=" { RET(TOKEN_GEQ); }
"==" { RET(TOKEN_EQL); }
"!=" { RET(TOKEN_NEQ); }
"##" { RET(TOKEN_HASHHASH); }
"(" { RET('('); }
")" { RET(')'); }
"[" { RET('['); }
"]" { RET(']'); }
"." { RET('.'); }
"," { RET(','); }
"&" { RET('&'); }
"!" { RET('!'); }
"~" { RET('~'); }
"-" { RET('-'); }
"+" { RET('+'); }
"*" { RET('*'); }
"/" { RET('/'); }
"%" { RET('%'); }
"<" { RET('<'); }
">" { RET('>'); }
"^" { RET('^'); }
"|" { RET('|'); }
":" { RET(':'); }
";" { RET(';'); }
"{" { RET('{'); }
"}" { RET('}'); }
"=" { RET('='); }
"?" { RET('?'); }
"\\" { RET('\\'); }
"#" { RET('#'); }
PP "include" { RET(TOKEN_PP_INCLUDE); }
PP "line" { RET(TOKEN_PP_LINE); }
PP "define" { RET(TOKEN_PP_DEFINE); }
PP "undef" { RET(TOKEN_PP_UNDEF); }
PP "if" { RET(TOKEN_PP_IF); }
PP "ifdef" { RET(TOKEN_PP_IFDEF); }
PP "ifndef" { RET(TOKEN_PP_IFNDEF); }
PP "else" { RET(TOKEN_PP_ELSE); }
PP "elif" { RET(TOKEN_PP_ELIF); }
PP "endif" { RET(TOKEN_PP_ENDIF); }
PP "error" { RET(TOKEN_PP_ERROR); }
WHITESPACE { goto scanner_loop; }
NEWLINE { s->line++; RET('\n'); }
any { printf("bad char\n"); goto scanner_loop; }
*/
multilinecomment:
if (YYLIMIT == YYCURSOR)
RET(TOKEN_PP_INCOMPLETE_COMMENT);
// The "*\/" is just to avoid screwing up text editor syntax highlighting.
/*!re2c
"*\/" {
if (saw_newline)
RET('\n');
goto scanner_loop;
}
NEWLINE {
s->line++;
token = cursor-1;
saw_newline = 1;
goto multilinecomment;
}
any { goto multilinecomment; }
*/
singlelinecomment:
if (YYLIMIT == YYCURSOR)
RET(TOKEN_EOI);
/*!re2c
NEWLINE { s->line++; token = cursor-1; RET('\n'); }
any { goto singlelinecomment; }
*/
// !!! FIXME
/*
bad_chars:
if (YYLIMIT == YYCURSOR)
RET(TOKEN_BAD_TOKEN);
*/
/*!re2c
NEWLINE { s->line++; goto scanner_loop; }
WHITESPACE { goto scanner_loop; }
any { goto singlelinecomment; }
*/
assert(0 && "Shouldn't hit this code");
RET(TOKEN_UNKNOWN);
} // preprocessor_internal_lexer
// end of mojoshader_lexer_preprocessor.re (or .c) ...