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[perl5.git] / parser.h
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1/* parser.h
2 *
2eee27d7 3 * Copyright (c) 2006, 2007, 2009, 2010, 2011 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
6cded92d 9 * and lexer (perly.c, toke.c).
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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;
33703721 17 I32 savestack_ix; /* size of savestack at this state */
8c63ea58 18 CV *compcv; /* value of PL_compcv when this value was created */
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19#ifdef DEBUGGING
20 const char *name; /* token/rule name for -Dpv */
21#endif
22} yy_stack_frame;
23
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24/* Fields that need to be shared with (i.e., visible to) inner lex-
25 ing scopes. */
26typedef struct yy_lexshared {
27 struct yy_lexshared *ls_prev;
28 line_t herelines; /* number of lines in here-doc */
29} LEXSHARED;
30
22735491 31typedef struct yy_parser {
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32
33 /* parser state */
34
22735491 35 struct yy_parser *old_parser; /* previous value of PL_parser */
5912531f 36 YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */
9bd87817 37 int yychar; /* The lookahead symbol. */
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38
39 /* Number of tokens to shift before error messages enabled. */
40 int yyerrstatus;
41
42 int stack_size;
43 int yylen; /* length of active reduction */
22735491 44 yy_stack_frame *stack; /* base of stack */
5912531f 45 yy_stack_frame *ps; /* current stack frame */
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46
47 /* lexer state */
48
78cdf107 49 I32 lex_brackets; /* square and curly bracket count */
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50 I32 lex_casemods; /* casemod count */
51 char *lex_brackstack;/* what kind of brackets to pop */
52 char *lex_casestack; /* what kind of case mods in effect */
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53 U8 lex_defer; /* state after determined token */
54 bool lex_dojoin; /* doing an array interpolation */
55 U8 lex_expect; /* expect after determined token */
53a7735b 56 U8 expect; /* how to interpret ambiguous tokens */
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57 I32 lex_formbrack; /* bracket count at outer format level */
58 OP *lex_inpat; /* in pattern $) and $| are special */
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59 OP *lex_op; /* extra info to pass back on op */
60 SV *lex_repl; /* runtime replacement from s/// */
651b5b28 61 U16 lex_inwhat; /* what kind of quoting are we in */
5ed5d9db 62 OPCODE last_lop_op; /* last named list or unary operator */
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63 I32 lex_starts; /* how many interps done on level */
64 SV *lex_stuff; /* runtime pattern from m// or s/// */
65 I32 multi_start; /* 1st line of multi-line string */
670a9cb2 66 I32 multi_end; /* last line of multi-line string */
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67 char multi_open; /* delimiter of said string */
68 char multi_close; /* delimiter of said string */
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69 char pending_ident; /* pending identifier lookup */
70 bool preambled;
78cdf107 71 I32 lex_allbrackets;/* (), [], {}, ?: bracket count */
199e78b7 72 SUBLEXINFO sublex_info;
d794b522 73 LEXSHARED *lex_shared;
bdc0bf6f 74 SV *linestr; /* current chunk of src text */
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75 char *bufptr; /* carries the cursor (current parsing
76 position) from one invocation of yylex
77 to the next */
78 char *oldbufptr; /* in yylex, beginning of current token */
79 char *oldoldbufptr; /* in yylex, beginning of previous token */
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80 char *bufend;
81 char *linestart; /* beginning of most recently read line */
82 char *last_uni; /* position of last named-unary op */
83 char *last_lop; /* position of last list operator */
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84 line_t copline; /* current line number */
85 U16 in_my; /* we're compiling a "my"/"our" declaration */
bc177e6b 86 U8 lex_state; /* next token is determined */
1f0c31d7 87 U8 error_count; /* how many compile errors so far, max 10 */
12bd6ede 88 HV *in_my_stash; /* declared class of this "my" declaration */
2f9285f8 89 PerlIO *rsfp; /* current source file pointer */
5486870f 90 AV *rsfp_filters; /* holds chain of active source filters */
583c9d5c 91 U8 form_lex_state; /* remember lex_state when parsing fmt */
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92
93#ifdef PERL_MAD
94 SV *endwhite;
95 I32 faketokens;
96 I32 lasttoke;
97 SV *nextwhite;
98 I32 realtokenstart;
99 SV *skipwhite;
100 SV *thisclose;
101 MADPROP * thismad;
102 SV *thisopen;
103 SV *thisstuff;
104 SV *thistoken;
105 SV *thiswhite;
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106
107/* What we know when we're in LEX_KNOWNEXT state. */
108 NEXTTOKE nexttoke[5]; /* value of next token, if any */
109 I32 curforce;
110#else
111 YYSTYPE nextval[5]; /* value of next token, if any */
112 I32 nexttype[5]; /* type of next token */
113 I32 nexttoke;
199e78b7 114#endif
fb205e7a 115
7c4baf47 116 COP *saved_curcop; /* the previous PL_curcop */
14047fc9 117 char tokenbuf[256];
7c4baf47 118
78cdf107 119 U8 lex_fakeeof; /* precedence at which to fake EOF */
286a76ab 120 U8 lex_flags;
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121 PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */
122 PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */
5912531f 123} yy_parser;
5912531f 124
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125/* flags for lexer API */
126#define LEX_STUFF_UTF8 0x00000001
127#define LEX_KEEP_PREVIOUS 0x00000002
17e00314 128
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129#ifdef PERL_CORE
130# define LEX_START_SAME_FILTER 0x00000001
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131# define LEX_IGNORE_UTF8_HINTS 0x00000002
132# define LEX_EVALBYTES 0x00000004
0abcdfa4 133# define LEX_START_COPIED 0x00000008
87606032 134# define LEX_DONT_CLOSE_RSFP 0x00000010
60d63348 135# define LEX_START_FLAGS \
0abcdfa4 136 (LEX_START_SAME_FILTER|LEX_START_COPIED \
87606032 137 |LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES|LEX_DONT_CLOSE_RSFP)
27fcb6ee 138#endif
f0e67a1d 139
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140/* flags for parser API */
141#define PARSE_OPTIONAL 0x00000001
142
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143/* values for lex_fakeeof */
144enum {
145 LEX_FAKEEOF_NEVER, /* don't fake EOF */
146 LEX_FAKEEOF_CLOSING, /* fake EOF at unmatched closing punctuation */
147 LEX_FAKEEOF_NONEXPR, /* ... and at token that can't be in expression */
148 LEX_FAKEEOF_LOWLOGIC, /* ... and at low-precedence logic operator */
149 LEX_FAKEEOF_COMMA, /* ... and at comma */
150 LEX_FAKEEOF_ASSIGN, /* ... and at assignment operator */
151 LEX_FAKEEOF_IFELSE, /* ... and at ?: operator */
152 LEX_FAKEEOF_RANGE, /* ... and at range operator */
153 LEX_FAKEEOF_LOGIC, /* ... and at logic operator */
154 LEX_FAKEEOF_BITWISE, /* ... and at bitwise operator */
155 LEX_FAKEEOF_COMPARE, /* ... and at comparison operator */
156 LEX_FAKEEOF_MAX
157};
158
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159/*
160 * Local variables:
161 * c-indentation-style: bsd
162 * c-basic-offset: 4
14d04a33 163 * indent-tabs-mode: nil
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164 * End:
165 *
14d04a33 166 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 167 */