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comparison perl-5.22.2/parser.h @ 8045:a16537d2fe07
<xfix> tar xf perl-5.22.2.tar.gz # Ah, whatever, I\'m doing it anyway
author | HackBot |
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date | Sat, 14 May 2016 14:54:38 +0000 |
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1 /* parser.h | |
2 * | |
3 * Copyright (c) 2006, 2007, 2009, 2010, 2011 Larry Wall and others | |
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 | |
12 #define YYEMPTY (-2) | |
13 | |
14 typedef struct { | |
15 YYSTYPE val; /* semantic value */ | |
16 short state; | |
17 I32 savestack_ix; /* size of savestack at this state */ | |
18 CV *compcv; /* value of PL_compcv when this value was created */ | |
19 #ifdef DEBUGGING | |
20 const char *name; /* token/rule name for -Dpv */ | |
21 #endif | |
22 } yy_stack_frame; | |
23 | |
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; | |
28 SV *ls_linestr; /* mirrors PL_parser->linestr */ | |
29 char *ls_bufptr; /* mirrors PL_parser->bufptr */ | |
30 char *re_eval_start; /* start of "(?{..." text */ | |
31 SV *re_eval_str; /* "(?{...})" text */ | |
32 } LEXSHARED; | |
33 | |
34 typedef struct yy_parser { | |
35 | |
36 /* parser state */ | |
37 | |
38 struct yy_parser *old_parser; /* previous value of PL_parser */ | |
39 YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */ | |
40 int yychar; /* The lookahead symbol. */ | |
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 */ | |
47 yy_stack_frame *stack; /* base of stack */ | |
48 yy_stack_frame *ps; /* current stack frame */ | |
49 | |
50 /* lexer state */ | |
51 | |
52 I32 lex_brackets; /* square and curly bracket count */ | |
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 */ | |
56 U8 lex_defer; /* state after determined token */ | |
57 U8 lex_dojoin; /* doing an array interpolation | |
58 1 = @{...} 2 = ->@ */ | |
59 U8 lex_expect; /* UNUSED */ | |
60 U8 expect; /* how to interpret ambiguous tokens */ | |
61 I32 lex_formbrack; /* bracket count at outer format level */ | |
62 OP *lex_inpat; /* in pattern $) and $| are special */ | |
63 OP *lex_op; /* extra info to pass back on op */ | |
64 SV *lex_repl; /* runtime replacement from s/// */ | |
65 U16 lex_inwhat; /* what kind of quoting are we in */ | |
66 OPCODE last_lop_op; /* last named list or unary operator */ | |
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 */ | |
70 I32 multi_end; /* last line of multi-line string */ | |
71 char multi_open; /* delimiter of said string */ | |
72 char multi_close; /* delimiter of said string */ | |
73 bool preambled; | |
74 bool lex_re_reparsing; /* we're doing G_RE_REPARSING */ | |
75 I32 lex_allbrackets;/* (), [], {}, ?: bracket count */ | |
76 SUBLEXINFO sublex_info; | |
77 LEXSHARED *lex_shared; | |
78 SV *linestr; /* current chunk of src text */ | |
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 */ | |
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 */ | |
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; | |
93 U16 in_my; /* we're compiling a "my"/"our" declaration */ | |
94 U8 lex_state; /* next token is determined */ | |
95 U8 error_count; /* how many compile errors so far, max 10 */ | |
96 HV *in_my_stash; /* declared class of this "my" declaration */ | |
97 PerlIO *rsfp; /* current source file pointer */ | |
98 AV *rsfp_filters; /* holds chain of active source filters */ | |
99 U8 form_lex_state; /* remember lex_state when parsing fmt */ | |
100 | |
101 YYSTYPE nextval[5]; /* value of next token, if any */ | |
102 I32 nexttype[5]; /* type of next token */ | |
103 U32 nexttoke; | |
104 | |
105 COP *saved_curcop; /* the previous PL_curcop */ | |
106 char tokenbuf[256]; | |
107 line_t herelines; /* number of lines in here-doc */ | |
108 line_t preambling; /* line # when processing $ENV{PERL5DB} */ | |
109 U8 lex_fakeeof; /* precedence at which to fake EOF */ | |
110 U8 lex_flags; | |
111 PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */ | |
112 PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */ | |
113 PERL_BITFIELD16 saw_infix_sigil:1; /* saw & or * or % operator */ | |
114 PERL_BITFIELD16 parsed_sub:1; /* last thing parsed was a sub */ | |
115 } yy_parser; | |
116 | |
117 /* flags for lexer API */ | |
118 #define LEX_STUFF_UTF8 0x00000001 | |
119 #define LEX_KEEP_PREVIOUS 0x00000002 | |
120 | |
121 #ifdef PERL_CORE | |
122 # define LEX_START_SAME_FILTER 0x00000001 | |
123 # define LEX_IGNORE_UTF8_HINTS 0x00000002 | |
124 # define LEX_EVALBYTES 0x00000004 | |
125 # define LEX_START_COPIED 0x00000008 | |
126 # define LEX_DONT_CLOSE_RSFP 0x00000010 | |
127 # define LEX_START_FLAGS \ | |
128 (LEX_START_SAME_FILTER|LEX_START_COPIED \ | |
129 |LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES|LEX_DONT_CLOSE_RSFP) | |
130 #endif | |
131 | |
132 /* flags for parser API */ | |
133 #define PARSE_OPTIONAL 0x00000001 | |
134 | |
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 | |
151 /* | |
152 * ex: set ts=8 sts=4 sw=4 et: | |
153 */ |