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/* parser.h
*
* Copyright (c) 2006, 2007, 2009, 2010, 2011 Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
* This file defines the layout of the parser object used by the parser
* and lexer (perly.c, toke.c).
*/
#define YYEMPTY (-2)
typedef struct {
YYSTYPE val; /* semantic value */
short state;
I32 savestack_ix; /* size of savestack at this state */
CV *compcv; /* value of PL_compcv when this value was created */
#ifdef DEBUGGING
const char *name; /* token/rule name for -Dpv */
#endif
} yy_stack_frame;
typedef struct yy_parser {
/* parser state */
struct yy_parser *old_parser; /* previous value of PL_parser */
YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */
int yychar; /* The lookahead symbol. */
/* Number of tokens to shift before error messages enabled. */
int yyerrstatus;
int stack_size;
int yylen; /* length of active reduction */
yy_stack_frame *stack; /* base of stack */
yy_stack_frame *ps; /* current stack frame */
/* lexer state */
I32 lex_brackets; /* square and curly bracket count */
I32 lex_casemods; /* casemod count */
char *lex_brackstack;/* what kind of brackets to pop */
char *lex_casestack; /* what kind of case mods in effect */
U8 lex_defer; /* state after determined token */
bool lex_dojoin; /* doing an array interpolation */
U8 lex_expect; /* expect after determined token */
U8 expect; /* how to interpret ambiguous tokens */
I32 lex_formbrack; /* bracket count at outer format level */
OP *lex_inpat; /* in pattern $) and $| are special */
OP *lex_op; /* extra info to pass back on op */
SV *lex_repl; /* runtime replacement from s/// */
U16 lex_inwhat; /* what kind of quoting are we in */
OPCODE last_lop_op; /* last list operator */
I32 lex_starts; /* how many interps done on level */
SV *lex_stuff; /* runtime pattern from m// or s/// */
I32 multi_start; /* 1st line of multi-line string */
I32 multi_end; /* last line of multi-line string */
char multi_open; /* delimiter of said string */
char multi_close; /* delimiter of said string */
char pending_ident; /* pending identifier lookup */
bool preambled;
I32 lex_allbrackets;/* (), [], {}, ?: bracket count */
SUBLEXINFO sublex_info;
SV *linestr; /* current chunk of src text */
char *bufptr;
char *oldbufptr;
char *oldoldbufptr;
char *bufend;
char *linestart; /* beginning of most recently read line */
char *last_uni; /* position of last named-unary op */
char *last_lop; /* position of last list operator */
line_t copline; /* current line number */
U16 in_my; /* we're compiling a "my"/"our" declaration */
U8 lex_state; /* next token is determined */
U8 error_count; /* how many compile errors so far, max 10 */
HV *in_my_stash; /* declared class of this "my" declaration */
PerlIO *rsfp; /* current source file pointer */
AV *rsfp_filters; /* holds chain of active source filters */
#ifdef PERL_MAD
SV *endwhite;
I32 faketokens;
I32 lasttoke;
SV *nextwhite;
I32 realtokenstart;
SV *skipwhite;
SV *thisclose;
MADPROP * thismad;
SV *thisopen;
SV *thisstuff;
SV *thistoken;
SV *thiswhite;
/* What we know when we're in LEX_KNOWNEXT state. */
NEXTTOKE nexttoke[5]; /* value of next token, if any */
I32 curforce;
#else
YYSTYPE nextval[5]; /* value of next token, if any */
I32 nexttype[5]; /* type of next token */
I32 nexttoke;
#endif
COP *saved_curcop; /* the previous PL_curcop */
char tokenbuf[256];
U8 lex_fakeeof; /* precedence at which to fake EOF */
U8 lex_flags;
PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */
PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */
} yy_parser;
/* flags for lexer API */
#define LEX_STUFF_UTF8 0x00000001
#define LEX_KEEP_PREVIOUS 0x00000002
#ifdef PERL_CORE
# define LEX_START_SAME_FILTER 0x00000001
# define LEX_IGNORE_UTF8_HINTS 0x00000002
# define LEX_EVALBYTES 0x00000004
# define LEX_START_COPIED 0x00000008
# define LEX_DONT_CLOSE_RSFP 0x00000010
# define LEX_START_FLAGS \
(LEX_START_SAME_FILTER|LEX_START_COPIED \
|LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES|LEX_DONT_CLOSE_RSFP)
#endif
/* flags for parser API */
#define PARSE_OPTIONAL 0x00000001
/* values for lex_fakeeof */
enum {
LEX_FAKEEOF_NEVER, /* don't fake EOF */
LEX_FAKEEOF_CLOSING, /* fake EOF at unmatched closing punctuation */
LEX_FAKEEOF_NONEXPR, /* ... and at token that can't be in expression */
LEX_FAKEEOF_LOWLOGIC, /* ... and at low-precedence logic operator */
LEX_FAKEEOF_COMMA, /* ... and at comma */
LEX_FAKEEOF_ASSIGN, /* ... and at assignment operator */
LEX_FAKEEOF_IFELSE, /* ... and at ?: operator */
LEX_FAKEEOF_RANGE, /* ... and at range operator */
LEX_FAKEEOF_LOGIC, /* ... and at logic operator */
LEX_FAKEEOF_BITWISE, /* ... and at bitwise operator */
LEX_FAKEEOF_COMPARE, /* ... and at comparison operator */
LEX_FAKEEOF_MAX
};
/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*
* ex: set ts=8 sts=4 sw=4 noet:
*/