/
mojoshader_lexer.re
197 lines (172 loc) · 6.07 KB
/
mojoshader_lexer.re
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/**
* 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 *matchptr;
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];
ANYLEGAL = [a-zA-Z0-9_/'*=+%^&|!#<>()[{}.,~^:;? \t\v\f\r\n\-\]\\];
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
"\\" [ \t\v\f]* NEWLINE { s->line++; goto scanner_loop; }
"/*" { goto multilinecomment; }
"//" { goto singlelinecomment; }
L (L|D)* { RET(TOKEN_IDENTIFIER); }
("0" [xX] H+ IS?) | ("0" D+ IS?) | (D+ IS?) |
(['] (ESC|ANY\[\r\n\\'])* ['])
{ RET(TOKEN_INT_LITERAL); }
(D+ E FS?) | (D* "." D+ E? FS?) | (D+ "." D* E? FS?)
{ RET(TOKEN_FLOAT_LITERAL); }
(["] (ESC|ANY\[\r\n\\"])* ["])
{ RET(TOKEN_STRING_LITERAL); }
">>=" { RET(TOKEN_RSHIFTASSIGN); }
"<<=" { RET(TOKEN_LSHIFTASSIGN); }
"+=" { RET(TOKEN_ADDASSIGN); }
"-=" { RET(TOKEN_SUBASSIGN); }
"*=" { RET(TOKEN_MULTASSIGN); }
"/=" { RET(TOKEN_DIVASSIGN); }
"%=" { RET(TOKEN_MODASSIGN); }
"^=" { RET(TOKEN_XORASSIGN); }
"&=" { RET(TOKEN_ANDASSIGN); }
"|=" { RET(TOKEN_ORASSIGN); }
"++" { RET(TOKEN_INCREMENT); }
"--" { RET(TOKEN_DECREMENT); }
">>" { 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('?'); }
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 { if (s->report_whitespace) RET(' '); goto scanner_loop; }
NEWLINE { s->line++; RET('\n'); }
ANY { goto bad_chars; }
*/
multilinecomment:
if (YYLIMIT == YYCURSOR)
RET(TOKEN_INCOMPLETE_COMMENT);
matchptr = cursor;
// The "*\/" is just to avoid screwing up text editor syntax highlighting.
/*!re2c
"*\/" {
if (saw_newline)
RET('\n');
else if (s->report_whitespace)
RET(' ');
goto scanner_loop;
}
NEWLINE {
s->line++;
token = matchptr;
saw_newline = 1;
goto multilinecomment;
}
ANY { goto multilinecomment; }
*/
singlelinecomment:
if (YYLIMIT == YYCURSOR)
RET(TOKEN_EOI);
matchptr = cursor;
/*!re2c
NEWLINE { s->line++; token = matchptr; RET('\n'); }
ANY { goto singlelinecomment; }
*/
bad_chars:
if (YYLIMIT == YYCURSOR)
RET(TOKEN_BAD_CHARS);
/*!re2c
ANYLEGAL { cursor--; RET(TOKEN_BAD_CHARS); }
ANY { goto bad_chars; }
*/
assert(0 && "Shouldn't hit this code");
RET(TOKEN_UNKNOWN);
} // preprocessor_internal_lexer
// end of mojoshader_lexer_preprocessor.re (or .c) ...