gramparse.h File Reference

#include "nodes/parsenodes.h"
#include "parser/scanner.h"
#include "parser/gram.h"

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Data Structures
struct	base_yy_extra_type

Macros
#define	pg_yyget_extra(yyscanner)   (*((base_yy_extra_type **) (yyscanner)))

Typedefs
typedef struct base_yy_extra_type	base_yy_extra_type

Functions
int	base_yylex (YYSTYPE *lvalp, YYLTYPE *llocp, core_yyscan_t yyscanner)
void	parser_init (base_yy_extra_type *yyext)
int	base_yyparse (core_yyscan_t yyscanner)

Macro Definition Documentation

pg_yyget_extra

#define pg_yyget_extra

(

yyscanner

)

(*((base_yy_extra_type **) (yyscanner)))

Definition at line 64 of file gramparse.h.

Referenced by base_yylex().

Typedef Documentation

base_yy_extra_type

typedef struct base_yy_extra_type base_yy_extra_type

Function Documentation

base_yylex()

int base_yylex	(	YYSTYPE *	lvalp,
		YYLTYPE *	llocp,
		core_yyscan_t	yyscanner
	)

Definition at line 83 of file parser.c.

References Assert, base_yy_extra_type::core_yy_extra, core_yylex(), base_yy_extra_type::have_lookahead, base_yy_extra_type::lookahead_end, base_yy_extra_type::lookahead_hold_char, base_yy_extra_type::lookahead_token, base_yy_extra_type::lookahead_yylloc, base_yy_extra_type::lookahead_yylval, next_token(), pg_yyget_extra, core_yy_extra_type::scanbuf, and YYLTYPE.

Referenced by filtered_base_yylex().

{
    base_yy_extra_type *yyextra = pg_yyget_extra(yyscanner);
    int         cur_token;
    int         next_token;
    int         cur_token_length;
    YYLTYPE     cur_yylloc;

    /* Get next token --- we might already have it */
    if (yyextra->have_lookahead)
    {
        cur_token = yyextra->lookahead_token;
        lvalp->core_yystype = yyextra->lookahead_yylval;
        *llocp = yyextra->lookahead_yylloc;
        *(yyextra->lookahead_end) = yyextra->lookahead_hold_char;
        yyextra->have_lookahead = false;
    }
    else
        cur_token = core_yylex(&(lvalp->core_yystype), llocp, yyscanner);

    /*
     * If this token isn't one that requires lookahead, just return it.  If it
     * does, determine the token length.  (We could get that via strlen(), but
     * since we have such a small set of possibilities, hardwiring seems
     * feasible and more efficient.)
     */
    switch (cur_token)
    {
        case NOT:
            cur_token_length = 3;
            break;
        case NULLS_P:
            cur_token_length = 5;
            break;
        case WITH:
            cur_token_length = 4;
            break;
        default:
            return cur_token;
    }

    /*
     * Identify end+1 of current token.  core_yylex() has temporarily stored a
     * '\0' here, and will undo that when we call it again.  We need to redo
     * it to fully revert the lookahead call for error reporting purposes.
     */
    yyextra->lookahead_end = yyextra->core_yy_extra.scanbuf +
        *llocp + cur_token_length;
    Assert(*(yyextra->lookahead_end) == '\0');

    /*
     * Save and restore *llocp around the call.  It might look like we could
     * avoid this by just passing &lookahead_yylloc to core_yylex(), but that
     * does not work because flex actually holds onto the last-passed pointer
     * internally, and will use that for error reporting.  We need any error
     * reports to point to the current token, not the next one.
     */
    cur_yylloc = *llocp;

    /* Get next token, saving outputs into lookahead variables */
    next_token = core_yylex(&(yyextra->lookahead_yylval), llocp, yyscanner);
    yyextra->lookahead_token = next_token;
    yyextra->lookahead_yylloc = *llocp;

    *llocp = cur_yylloc;

    /* Now revert the un-truncation of the current token */
    yyextra->lookahead_hold_char = *(yyextra->lookahead_end);
    *(yyextra->lookahead_end) = '\0';

    yyextra->have_lookahead = true;

    /* Replace cur_token if needed, based on lookahead */
    switch (cur_token)
    {
        case NOT:
            /* Replace NOT by NOT_LA if it's followed by BETWEEN, IN, etc */
            switch (next_token)
            {
                case BETWEEN:
                case IN_P:
                case LIKE:
                case ILIKE:
                case SIMILAR:
                    cur_token = NOT_LA;
                    break;
            }
            break;

        case NULLS_P:
            /* Replace NULLS_P by NULLS_LA if it's followed by FIRST or LAST */
            switch (next_token)
            {
                case FIRST_P:
                case LAST_P:
                    cur_token = NULLS_LA;
                    break;
            }
            break;

        case WITH:
            /* Replace WITH by WITH_LA if it's followed by TIME or ORDINALITY */
            switch (next_token)
            {
                case TIME:
                case ORDINALITY:
                    cur_token = WITH_LA;
                    break;
            }
            break;
    }

    return cur_token;
}

base_yyparse()

int base_yyparse

(

core_yyscan_t

yyscanner

)

Referenced by main(), and raw_parser().

parser_init()

void parser_init

(

base_yy_extra_type *

yyext

)

Referenced by raw_parser().