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/*-------------------------------------------------------------------------
*
* gramparse.h
* Shared definitions for the "raw" parser (flex and bison phases only)
*
* NOTE: this file is only meant to be included in the core parsing files,
* ie, parser.c, gram.y, scan.l, and keywords.c. Definitions that are needed
* outside the core parser should be in parser.h.
*
*
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/parser/gramparse.h,v 1.46 2009/07/13 02:02:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef GRAMPARSE_H
#define GRAMPARSE_H
#include "nodes/parsenodes.h"
/*
* We track token locations in terms of byte offsets from the start of the
* source string, not the column number/line number representation that
* bison uses by default. Also, to minimize overhead we track only one
* location (usually the first token location) for each construct, not
* the beginning and ending locations as bison does by default. It's
* therefore sufficient to make YYLTYPE an int.
*/
#define YYLTYPE int
/*
* After defining YYLTYPE, it's safe to include gram.h.
*/
#include "parser/gram.h"
/*
* The YY_EXTRA data that a flex scanner allows us to pass around. Private
* state needed for raw parsing/lexing goes here.
*/
typedef struct base_yy_extra_type
{
/*
* The string the lexer is physically scanning. We keep this mainly so
* that we can cheaply compute the offset of the current token (yytext).
*/
char *scanbuf;
Size scanbuflen;
/*
* literalbuf is used to accumulate literal values when multiple rules
* are needed to parse a single literal. Call startlit() to reset buffer
* to empty, addlit() to add text. NOTE: the string in literalbuf is
* NOT necessarily null-terminated, but there always IS room to add a
* trailing null at offset literallen. We store a null only when we
* need it.
*/
char *literalbuf; /* palloc'd expandable buffer */
int literallen; /* actual current string length */
int literalalloc; /* current allocated buffer size */
int xcdepth; /* depth of nesting in slash-star comments */
char *dolqstart; /* current $foo$ quote start string */
/* state variables for literal-lexing warnings */
bool warn_on_first_escape;
bool saw_non_ascii;
/*
* State variables for filtered_base_yylex().
*/
bool have_lookahead; /* is lookahead info valid? */
int lookahead_token; /* one-token lookahead */
YYSTYPE lookahead_yylval; /* yylval for lookahead token */
YYLTYPE lookahead_yylloc; /* yylloc for lookahead token */
/*
* State variables that belong to the grammar, not the lexer. It's
* simpler to keep these here than to invent a separate structure.
* These fields are unused/undefined if the lexer is invoked on its own.
*/
List *parsetree; /* final parse result is delivered here */
bool QueryIsRule; /* signals we are parsing CREATE RULE */
} base_yy_extra_type;
/*
* The type of yyscanner is opaque outside scan.l.
*/
typedef void *base_yyscan_t;
/*
* In principle we should use yyget_extra() to fetch the yyextra field
* from a yyscanner struct. However, flex always puts that field first,
* and this is sufficiently performance-critical to make it seem worth
* cheating a bit to use an inline macro.
*/
#define pg_yyget_extra(yyscanner) (*((base_yy_extra_type **) (yyscanner)))
/* from parser.c */
extern int filtered_base_yylex(YYSTYPE *lvalp, YYLTYPE *llocp,
base_yyscan_t yyscanner);
/* from scan.l */
extern base_yyscan_t scanner_init(const char *str, base_yy_extra_type *yyext);
extern void scanner_finish(base_yyscan_t yyscanner);
extern int base_yylex(YYSTYPE *lvalp, YYLTYPE *llocp,
base_yyscan_t yyscanner);
extern int scanner_errposition(int location, base_yyscan_t yyscanner);
extern void scanner_yyerror(const char *message, base_yyscan_t yyscanner);
/* from gram.y */
extern void parser_init(base_yy_extra_type *yyext);
extern int base_yyparse(base_yyscan_t yyscanner);
#endif /* GRAMPARSE_H */
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