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gramparse.h
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1 /*-------------------------------------------------------------------------
2  *
3  * gramparse.h
4  * Shared definitions for the "raw" parser (flex and bison phases only)
5  *
6  * NOTE: this file is only meant to be included in the core parsing files,
7  * ie, parser.c, gram.y, scan.l, and src/common/keywords.c.
8  * Definitions that are needed outside the core parser should be in parser.h.
9  *
10  *
11  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
12  * Portions Copyright (c) 1994, Regents of the University of California
13  *
14  * src/include/parser/gramparse.h
15  *
16  *-------------------------------------------------------------------------
17  */
18 
19 #ifndef GRAMPARSE_H
20 #define GRAMPARSE_H
21 
22 #include "nodes/parsenodes.h"
23 #include "parser/scanner.h"
24 
25 /*
26  * NB: include gram.h only AFTER including scanner.h, because scanner.h
27  * is what #defines YYLTYPE.
28  */
29 #include "parser/gram.h"
30 
31 /*
32  * The YY_EXTRA data that a flex scanner allows us to pass around. Private
33  * state needed for raw parsing/lexing goes here.
34  */
35 typedef struct base_yy_extra_type
36 {
37  /*
38  * Fields used by the core scanner.
39  */
41 
42  /*
43  * State variables for base_yylex().
44  */
45  bool have_lookahead; /* is lookahead info valid? */
46  int lookahead_token; /* one-token lookahead */
47  core_YYSTYPE lookahead_yylval; /* yylval for lookahead token */
48  YYLTYPE lookahead_yylloc; /* yylloc for lookahead token */
49  char *lookahead_end; /* end of current token */
50  char lookahead_hold_char; /* to be put back at *lookahead_end */
51 
52  /*
53  * State variables that belong to the grammar.
54  */
55  List *parsetree; /* final parse result is delivered here */
57 
58 /*
59  * In principle we should use yyget_extra() to fetch the yyextra field
60  * from a yyscanner struct. However, flex always puts that field first,
61  * and this is sufficiently performance-critical to make it seem worth
62  * cheating a bit to use an inline macro.
63  */
64 #define pg_yyget_extra(yyscanner) (*((base_yy_extra_type **) (yyscanner)))
65 
66 
67 /* from parser.c */
68 extern int base_yylex(YYSTYPE *lvalp, YYLTYPE *llocp,
70 
71 /* from gram.y */
72 extern void parser_init(base_yy_extra_type *yyext);
74 
75 #endif /* GRAMPARSE_H */
char * lookahead_end
Definition: gramparse.h:49
int base_yyparse(core_yyscan_t yyscanner)
void * core_yyscan_t
Definition: scanner.h:116
core_YYSTYPE lookahead_yylval
Definition: gramparse.h:47
core_yy_extra_type core_yy_extra
Definition: gramparse.h:40
void parser_init(base_yy_extra_type *yyext)
#define YYLTYPE
Definition: scanner.h:44
struct base_yy_extra_type base_yy_extra_type
YYLTYPE lookahead_yylloc
Definition: gramparse.h:48
char lookahead_hold_char
Definition: gramparse.h:50
static core_yyscan_t yyscanner
Definition: pl_scanner.c:210
int base_yylex(YYSTYPE *lvalp, YYLTYPE *llocp, core_yyscan_t yyscanner)
Definition: parser.c:83
Definition: pg_list.h:45