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Scanner performance improvements

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Use flex flags -CF.  Pass the to-be-scanned string around as StringInfo
type, to avoid querying the length repeatedly.  Clean up some code and
remove lex-compatibility cruft.  Escape backslash sequences inline.  Use
flex-provided yy_scan_buffer() function to set up input, rather than using
myinput().
This commit is contained in:
Peter Eisentraut
2002-04-20 21:56:15 +00:00
parent ff4281472a
commit 32c6c99e0b
8 changed files with 144 additions and 155 deletions
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7
src/include/parser/gramparse.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: gramparse.h,v 1.20 2002/04/09 20:35:55 tgl Exp $
* $Id: gramparse.h,v 1.21 2002/04/20 21:56:15 petere Exp $
*
*-------------------------------------------------------------------------
*/
@@ -15,11 +15,14 @@
#ifndef GRAMPARSE_H
#define GRAMPARSE_H
#include "lib/stringinfo.h"
/* from parser.c */
extern int yylex(void);
/* from scan.l */
extern void scanner_init(void);
extern void scanner_init(StringInfo str);
extern void scanner_finish(void);
extern int base_yylex(void);
extern void yyerror(const char *message);