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Edit File : parser.h \| Size : 6.75 KB
/* 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: */ Back

Edit File : parser.h | Size : 6.75 KB

/*    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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