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[perl5.git] / parser.h
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1/* parser.h
2 *
bc641c27 3 * Copyright (c) 2006, 2007, Larry Wall and others
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4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
8 * This file defines the layout of the parser object used by the parser
9 * and lexer (perly.c, toke,c).
10 */
11
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12#define YYEMPTY (-2)
13
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14typedef struct {
15 YYSTYPE val; /* semantic value */
16 short state;
17 AV *comppad; /* value of PL_comppad when this value was created */
18#ifdef DEBUGGING
19 const char *name; /* token/rule name for -Dpv */
20#endif
21} yy_stack_frame;
22
22735491 23typedef struct yy_parser {
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24
25 /* parser state */
26
22735491 27 struct yy_parser *old_parser; /* previous value of PL_parser */
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28 int yychar; /* The lookahead symbol. */
29 YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */
30
31 /* Number of tokens to shift before error messages enabled. */
32 int yyerrstatus;
33
34 int stack_size;
35 int yylen; /* length of active reduction */
22735491 36 yy_stack_frame *stack; /* base of stack */
5912531f 37 yy_stack_frame *ps; /* current stack frame */
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38
39 /* lexer state */
40
41 I32 lex_brackets; /* bracket count */
42 I32 lex_casemods; /* casemod count */
43 char *lex_brackstack;/* what kind of brackets to pop */
44 char *lex_casestack; /* what kind of case mods in effect */
45 U32 lex_defer; /* state after determined token */
46 I32 lex_dojoin; /* doing an array interpolation */
47 int lex_expect; /* expect after determined token */
48 I32 lex_formbrack; /* bracket count at outer format level */
49 OP *lex_inpat; /* in pattern $) and $| are special */
50 I32 lex_inwhat; /* what kind of quoting are we in */
51 OP *lex_op; /* extra info to pass back on op */
52 SV *lex_repl; /* runtime replacement from s/// */
53 I32 lex_starts; /* how many interps done on level */
54 SV *lex_stuff; /* runtime pattern from m// or s/// */
55 I32 multi_start; /* 1st line of multi-line string */
56 I32 multi_open; /* delimiter of said string */
57 I32 multi_close; /* delimiter of said string */
58 char pending_ident; /* pending identifier lookup */
59 bool preambled;
60 SUBLEXINFO sublex_info;
61
62#ifdef PERL_MAD
63 SV *endwhite;
64 I32 faketokens;
65 I32 lasttoke;
66 SV *nextwhite;
67 I32 realtokenstart;
68 SV *skipwhite;
69 SV *thisclose;
70 MADPROP * thismad;
71 SV *thisopen;
72 SV *thisstuff;
73 SV *thistoken;
74 SV *thiswhite;
75#endif
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76} yy_parser;
77
78