/* 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:
*/
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