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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: */