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parser.h
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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; /* Fields that need to be shared with (i.e., visible to) inner lex- ing scopes. */ typedef struct yy_lexshared { struct yy_lexshared *ls_prev; SV *ls_linestr; /* mirrors PL_parser->linestr */ char *ls_bufptr; /* mirrors PL_parser->bufptr */ char *re_eval_start; /* start of "(?{..." text */ SV *re_eval_str; /* "(?{...})" text */ } LEXSHARED; 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 yylen; /* length of active reduction */ yy_stack_frame *stack; /* base of stack */ yy_stack_frame *stack_max1;/* (top-1)th element of allocated 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 */ U8 lex_dojoin; /* doing an array interpolation 1 = @{...} 2 = ->@ */ U8 expect; /* how to interpret ambiguous tokens */ bool preambled; 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 named list or unary 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 */ UV multi_open; /* delimiter of said string */ UV multi_close; /* delimiter of said string */ bool lex_re_reparsing; /* we're doing G_RE_REPARSING */ U8 lex_super_state;/* lexer state to save */ U16 lex_sub_inwhat; /* "lex_inwhat" to use in sublex_push */ I32 lex_allbrackets;/* (), [], {}, ?: bracket count */ OP *lex_sub_op; /* current op in y/// or pattern */ SV *lex_sub_repl; /* repl of s/// used in sublex_push */ LEXSHARED *lex_shared; SV *linestr; /* current chunk of src text */ char *bufptr; /* carries the cursor (current parsing position) from one invocation of yylex to the next */ char *oldbufptr; /* in yylex, beginning of current token */ char *oldoldbufptr; /* in yylex, beginning of previous token */ 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 */ /* copline is used to pass a specific line number to newSTATEOP. It is a one-time line number, as newSTATEOP invalidates it (sets it to NOLINE) after using it. The purpose of this is to report line num- bers in multiline constructs using the number of the first line. */ line_t copline; 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 */ YYSTYPE nextval[5]; /* value of next token, if any */ I32 nexttype[5]; /* type of next token */ U8 nexttoke; U8 form_lex_state; /* remember lex_state when parsing fmt */ U8 lex_fakeeof; /* precedence at which to fake EOF */ U8 lex_flags; COP *saved_curcop; /* the previous PL_curcop */ char tokenbuf[256]; line_t herelines; /* number of lines in here-doc */ line_t preambling; /* line # when processing $ENV{PERL5DB} */ /* these are valid while parsing a subroutine signature */ IV sig_elems; /* number of signature elements seen so far */ IV sig_optelems; /* number of optional signature elems seen */ char sig_slurpy; /* the sigil of the slurpy var (or null) */ bool recheck_utf8_validity; PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */ PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */ PERL_BITFIELD16 saw_infix_sigil:1; /* saw & or * or % operator */ PERL_BITFIELD16 parsed_sub:1; /* last thing parsed was a sub */ bool sub_no_recover; /* can't recover from a sublex error */ U8 sub_error_count; /* the number of errors before sublexing */ } 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 }; /* * ex: set ts=8 sts=4 sw=4 et: */