166 lines
6.9 KiB
C
166 lines
6.9 KiB
C
/* parser.h
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*
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* Copyright (c) 2006, 2007, 2009, 2010, 2011 Larry Wall and others
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Artistic License, as specified in the README file.
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*
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* This file defines the layout of the parser object used by the parser
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* and lexer (perly.c, toke.c).
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*/
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#define YYEMPTY (-2)
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typedef struct {
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YYSTYPE val; /* semantic value */
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short state;
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I32 savestack_ix; /* size of savestack at this state */
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CV *compcv; /* value of PL_compcv when this value was created */
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#ifdef DEBUGGING
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const char *name; /* token/rule name for -Dpv */
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#endif
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} yy_stack_frame;
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/* Fields that need to be shared with (i.e., visible to) inner lex-
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ing scopes. */
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typedef struct yy_lexshared {
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struct yy_lexshared *ls_prev;
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SV *ls_linestr; /* mirrors PL_parser->linestr */
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char *ls_bufptr; /* mirrors PL_parser->bufptr */
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char *re_eval_start; /* start of "(?{..." text */
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SV *re_eval_str; /* "(?{...})" text */
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} LEXSHARED;
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typedef struct yy_parser {
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/* parser state */
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struct yy_parser *old_parser; /* previous value of PL_parser */
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YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */
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int yychar; /* The lookahead symbol. */
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/* Number of tokens to shift before error messages enabled. */
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int yyerrstatus;
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yy_stack_frame *stack; /* base of stack */
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yy_stack_frame *stack_max1;/* (top-1)th element of allocated stack */
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yy_stack_frame *ps; /* current stack frame */
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int yylen; /* length of active reduction */
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/* lexer state */
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I32 lex_formbrack; /* bracket count at outer format level */
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I32 lex_brackets; /* square and curly bracket count */
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I32 lex_casemods; /* casemod count */
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char *lex_brackstack;/* what kind of brackets to pop */
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char *lex_casestack; /* what kind of case mods in effect */
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U8 lex_defer; /* state after determined token */
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U8 lex_dojoin; /* doing an array interpolation
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1 = @{...} 2 = ->@ */
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U8 expect; /* how to interpret ambiguous tokens */
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bool preambled;
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bool sub_no_recover; /* can't recover from a sublex error */
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U8 sub_error_count; /* the number of errors before sublexing */
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OP *lex_inpat; /* in pattern $) and $| are special */
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OP *lex_op; /* extra info to pass back on op */
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SV *lex_repl; /* runtime replacement from s/// */
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U16 lex_inwhat; /* what kind of quoting are we in */
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OPCODE last_lop_op; /* last named list or unary operator */
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I32 lex_starts; /* how many interps done on level */
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SV *lex_stuff; /* runtime pattern from m// or s/// */
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I32 multi_start; /* 1st line of multi-line string */
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I32 multi_end; /* last line of multi-line string */
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UV multi_open; /* delimiter code point of said string */
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UV multi_close; /* delimiter code point of said string */
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bool lex_re_reparsing; /* we're doing G_RE_REPARSING */
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U8 lex_super_state;/* lexer state to save */
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U16 lex_sub_inwhat; /* "lex_inwhat" to use in sublex_push */
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I32 lex_allbrackets;/* (), [], {}, ?: bracket count */
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OP *lex_sub_op; /* current op in y/// or pattern */
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SV *lex_sub_repl; /* repl of s/// used in sublex_push */
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LEXSHARED *lex_shared;
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SV *linestr; /* current chunk of src text */
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char *bufptr; /* carries the cursor (current parsing
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position) from one invocation of yylex
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to the next */
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char *oldbufptr; /* in yylex, beginning of current token */
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char *oldoldbufptr; /* in yylex, beginning of previous token */
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char *bufend;
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char *linestart; /* beginning of most recently read line */
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char *last_uni; /* position of last named-unary op */
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char *last_lop; /* position of last list operator */
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/* copline is used to pass a specific line number to newSTATEOP. It
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is a one-time line number, as newSTATEOP invalidates it (sets it to
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NOLINE) after using it. The purpose of this is to report line num-
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bers in multiline constructs using the number of the first line. */
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line_t copline;
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U16 in_my; /* we're compiling a "my"/"our" declaration */
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U8 lex_state; /* next token is determined */
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U8 error_count; /* how many compile errors so far, max 10 */
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HV *in_my_stash; /* declared class of this "my" declaration */
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PerlIO *rsfp; /* current source file pointer */
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AV *rsfp_filters; /* holds chain of active source filters */
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YYSTYPE nextval[5]; /* value of next token, if any */
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I32 nexttype[5]; /* type of next token */
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U8 nexttoke;
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U8 form_lex_state; /* remember lex_state when parsing fmt */
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U8 lex_fakeeof; /* precedence at which to fake EOF */
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U8 lex_flags;
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COP *saved_curcop; /* the previous PL_curcop */
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char tokenbuf[256];
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line_t herelines; /* number of lines in here-doc */
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line_t preambling; /* line # when processing $ENV{PERL5DB} */
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/* these are valid while parsing a subroutine signature */
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UV sig_elems; /* number of signature elements seen so far */
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UV sig_optelems; /* number of optional signature elems seen */
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char sig_slurpy; /* the sigil of the slurpy var (or null) */
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bool sig_seen; /* the currently parsing sub has a signature */
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bool recheck_utf8_validity;
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PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */
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PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */
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PERL_BITFIELD16 saw_infix_sigil:1; /* saw & or * or % operator */
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PERL_BITFIELD16 parsed_sub:1; /* last thing parsed was a sub */
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} yy_parser;
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/* flags for lexer API */
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#define LEX_STUFF_UTF8 0x00000001
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#define LEX_KEEP_PREVIOUS 0x00000002
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#ifdef PERL_CORE
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# define LEX_START_SAME_FILTER 0x00000001
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# define LEX_IGNORE_UTF8_HINTS 0x00000002
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# define LEX_EVALBYTES 0x00000004
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# define LEX_START_COPIED 0x00000008
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# define LEX_DONT_CLOSE_RSFP 0x00000010
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# define LEX_START_FLAGS \
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(LEX_START_SAME_FILTER|LEX_START_COPIED \
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|LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES|LEX_DONT_CLOSE_RSFP)
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#endif
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/* flags for parser API */
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#define PARSE_OPTIONAL 0x00000001
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/* values for lex_fakeeof */
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enum {
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LEX_FAKEEOF_NEVER, /* don't fake EOF */
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LEX_FAKEEOF_CLOSING, /* fake EOF at unmatched closing punctuation */
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LEX_FAKEEOF_NONEXPR, /* ... and at token that can't be in expression */
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LEX_FAKEEOF_LOWLOGIC, /* ... and at low-precedence logic operator */
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LEX_FAKEEOF_COMMA, /* ... and at comma */
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LEX_FAKEEOF_ASSIGN, /* ... and at assignment operator */
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LEX_FAKEEOF_IFELSE, /* ... and at ?: operator */
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LEX_FAKEEOF_RANGE, /* ... and at range operator */
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LEX_FAKEEOF_LOGIC, /* ... and at logic operator */
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LEX_FAKEEOF_BITWISE, /* ... and at bitwise operator */
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LEX_FAKEEOF_COMPARE, /* ... and at comparison operator */
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LEX_FAKEEOF_MAX
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};
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/*
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* ex: set ts=8 sts=4 sw=4 et:
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*/
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