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5912531f DM |
1 | /* parser.h |
2 | * | |
2eee27d7 | 3 | * Copyright (c) 2006, 2007, 2009, 2010, 2011 Larry Wall and others |
5912531f DM |
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). |
5912531f DM |
10 | */ |
11 | ||
acdf0a21 DM |
12 | #define YYEMPTY (-2) |
13 | ||
5912531f DM |
14 | typedef 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 */ |
5912531f DM |
19 | #ifdef DEBUGGING |
20 | const char *name; /* token/rule name for -Dpv */ | |
21 | #endif | |
22 | } yy_stack_frame; | |
23 | ||
d794b522 FC |
24 | /* Fields that need to be shared with (i.e., visible to) inner lex- |
25 | ing scopes. */ | |
26 | typedef struct yy_lexshared { | |
27 | struct yy_lexshared *ls_prev; | |
60f40a38 FC |
28 | SV *ls_linestr; /* mirrors PL_parser->linestr */ |
29 | char *ls_bufptr; /* mirrors PL_parser->bufptr */ | |
3328ab5a FC |
30 | char *re_eval_start; /* start of "(?{..." text */ |
31 | SV *re_eval_str; /* "(?{...})" text */ | |
d794b522 FC |
32 | } LEXSHARED; |
33 | ||
22735491 | 34 | typedef struct yy_parser { |
199e78b7 DM |
35 | |
36 | /* parser state */ | |
37 | ||
22735491 | 38 | struct yy_parser *old_parser; /* previous value of PL_parser */ |
5912531f | 39 | YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */ |
9bd87817 | 40 | int yychar; /* The lookahead symbol. */ |
5912531f DM |
41 | |
42 | /* Number of tokens to shift before error messages enabled. */ | |
43 | int yyerrstatus; | |
44 | ||
45 | int stack_size; | |
46 | int yylen; /* length of active reduction */ | |
22735491 | 47 | yy_stack_frame *stack; /* base of stack */ |
5912531f | 48 | yy_stack_frame *ps; /* current stack frame */ |
199e78b7 DM |
49 | |
50 | /* lexer state */ | |
51 | ||
78cdf107 | 52 | I32 lex_brackets; /* square and curly bracket count */ |
199e78b7 DM |
53 | I32 lex_casemods; /* casemod count */ |
54 | char *lex_brackstack;/* what kind of brackets to pop */ | |
55 | char *lex_casestack; /* what kind of case mods in effect */ | |
651b5b28 | 56 | U8 lex_defer; /* state after determined token */ |
cc624add FC |
57 | U8 lex_dojoin; /* doing an array interpolation |
58 | 1 = @{...} 2 = ->@ */ | |
8f0d8652 | 59 | U8 lex_expect; /* UNUSED */ |
53a7735b | 60 | U8 expect; /* how to interpret ambiguous tokens */ |
199e78b7 DM |
61 | I32 lex_formbrack; /* bracket count at outer format level */ |
62 | OP *lex_inpat; /* in pattern $) and $| are special */ | |
199e78b7 DM |
63 | OP *lex_op; /* extra info to pass back on op */ |
64 | SV *lex_repl; /* runtime replacement from s/// */ | |
651b5b28 | 65 | U16 lex_inwhat; /* what kind of quoting are we in */ |
5ed5d9db | 66 | OPCODE last_lop_op; /* last named list or unary operator */ |
199e78b7 DM |
67 | I32 lex_starts; /* how many interps done on level */ |
68 | SV *lex_stuff; /* runtime pattern from m// or s/// */ | |
69 | I32 multi_start; /* 1st line of multi-line string */ | |
670a9cb2 | 70 | I32 multi_end; /* last line of multi-line string */ |
651b5b28 NC |
71 | char multi_open; /* delimiter of said string */ |
72 | char multi_close; /* delimiter of said string */ | |
199e78b7 | 73 | bool preambled; |
3a54fd60 | 74 | bool lex_re_reparsing; /* we're doing G_RE_REPARSING */ |
78cdf107 | 75 | I32 lex_allbrackets;/* (), [], {}, ?: bracket count */ |
199e78b7 | 76 | SUBLEXINFO sublex_info; |
d794b522 | 77 | LEXSHARED *lex_shared; |
bdc0bf6f | 78 | SV *linestr; /* current chunk of src text */ |
a0dffe9b FC |
79 | char *bufptr; /* carries the cursor (current parsing |
80 | position) from one invocation of yylex | |
81 | to the next */ | |
82 | char *oldbufptr; /* in yylex, beginning of current token */ | |
83 | char *oldoldbufptr; /* in yylex, beginning of previous token */ | |
f06b5848 DM |
84 | char *bufend; |
85 | char *linestart; /* beginning of most recently read line */ | |
86 | char *last_uni; /* position of last named-unary op */ | |
87 | char *last_lop; /* position of last list operator */ | |
1f68b13b FC |
88 | /* copline is used to pass a specific line number to newSTATEOP. It |
89 | is a one-time line number, as newSTATEOP invalidates it (sets it to | |
90 | NOLINE) after using it. The purpose of this is to report line num- | |
91 | bers in multiline constructs using the number of the first line. */ | |
92 | line_t copline; | |
12bd6ede | 93 | U16 in_my; /* we're compiling a "my"/"our" declaration */ |
bc177e6b | 94 | U8 lex_state; /* next token is determined */ |
1f0c31d7 | 95 | U8 error_count; /* how many compile errors so far, max 10 */ |
12bd6ede | 96 | HV *in_my_stash; /* declared class of this "my" declaration */ |
2f9285f8 | 97 | PerlIO *rsfp; /* current source file pointer */ |
5486870f | 98 | AV *rsfp_filters; /* holds chain of active source filters */ |
583c9d5c | 99 | U8 form_lex_state; /* remember lex_state when parsing fmt */ |
199e78b7 | 100 | |
fb205e7a DM |
101 | YYSTYPE nextval[5]; /* value of next token, if any */ |
102 | I32 nexttype[5]; /* type of next token */ | |
a2867f88 | 103 | U32 nexttoke; |
fb205e7a | 104 | |
7c4baf47 | 105 | COP *saved_curcop; /* the previous PL_curcop */ |
14047fc9 | 106 | char tokenbuf[256]; |
851b527a | 107 | line_t herelines; /* number of lines in here-doc */ |
7f1c3e8c | 108 | line_t preambling; /* line # when processing $ENV{PERL5DB} */ |
78cdf107 | 109 | U8 lex_fakeeof; /* precedence at which to fake EOF */ |
286a76ab | 110 | U8 lex_flags; |
7ad221d3 FC |
111 | PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */ |
112 | PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */ | |
9700e2d3 | 113 | PERL_BITFIELD16 saw_infix_sigil:1; /* saw & or * or % operator */ |
34b54951 | 114 | PERL_BITFIELD16 parsed_sub:1; /* last thing parsed was a sub */ |
5912531f | 115 | } yy_parser; |
5912531f | 116 | |
f0e67a1d Z |
117 | /* flags for lexer API */ |
118 | #define LEX_STUFF_UTF8 0x00000001 | |
119 | #define LEX_KEEP_PREVIOUS 0x00000002 | |
17e00314 | 120 | |
27fcb6ee FC |
121 | #ifdef PERL_CORE |
122 | # define LEX_START_SAME_FILTER 0x00000001 | |
60d63348 FC |
123 | # define LEX_IGNORE_UTF8_HINTS 0x00000002 |
124 | # define LEX_EVALBYTES 0x00000004 | |
0abcdfa4 | 125 | # define LEX_START_COPIED 0x00000008 |
87606032 | 126 | # define LEX_DONT_CLOSE_RSFP 0x00000010 |
60d63348 | 127 | # define LEX_START_FLAGS \ |
0abcdfa4 | 128 | (LEX_START_SAME_FILTER|LEX_START_COPIED \ |
87606032 | 129 | |LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES|LEX_DONT_CLOSE_RSFP) |
27fcb6ee | 130 | #endif |
f0e67a1d | 131 | |
361d9b55 Z |
132 | /* flags for parser API */ |
133 | #define PARSE_OPTIONAL 0x00000001 | |
134 | ||
78cdf107 Z |
135 | /* values for lex_fakeeof */ |
136 | enum { | |
137 | LEX_FAKEEOF_NEVER, /* don't fake EOF */ | |
138 | LEX_FAKEEOF_CLOSING, /* fake EOF at unmatched closing punctuation */ | |
139 | LEX_FAKEEOF_NONEXPR, /* ... and at token that can't be in expression */ | |
140 | LEX_FAKEEOF_LOWLOGIC, /* ... and at low-precedence logic operator */ | |
141 | LEX_FAKEEOF_COMMA, /* ... and at comma */ | |
142 | LEX_FAKEEOF_ASSIGN, /* ... and at assignment operator */ | |
143 | LEX_FAKEEOF_IFELSE, /* ... and at ?: operator */ | |
144 | LEX_FAKEEOF_RANGE, /* ... and at range operator */ | |
145 | LEX_FAKEEOF_LOGIC, /* ... and at logic operator */ | |
146 | LEX_FAKEEOF_BITWISE, /* ... and at bitwise operator */ | |
147 | LEX_FAKEEOF_COMPARE, /* ... and at comparison operator */ | |
148 | LEX_FAKEEOF_MAX | |
149 | }; | |
150 | ||
e9a8c099 | 151 | /* |
14d04a33 | 152 | * ex: set ts=8 sts=4 sw=4 et: |
e9a8c099 | 153 | */ |