database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-09-02 04:21:28 +03:00
Code Activity

Implement SQL99 OVERLAY(). Allows substitution of a substring in a string.

Browse Source 
Implement SQL99 SIMILAR TO as a synonym for our existing operator "~".
Implement SQL99 regular expression SUBSTRING(string FROM pat FOR escape).
 Extend the definition to make the FOR clause optional.
 Define textregexsubstr() to actually implement this feature.
Update the regression test to include these new string features.
 All tests pass.
Rename the regular expression support routines from "pg95_xxx" to "pg_xxx".
Define CREATE CHARACTER SET in the parser per SQL99. No implementation yet.
This commit is contained in:
Thomas G. Lockhart
2002-06-11 15:44:38 +00:00
parent 090dd22de6
commit ea01a451cc
16 changed files with 521 additions and 258 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/backend/parser/scan.l
View File

@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.94 2002/05/02 18:44:10 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.95 2002/06/11 15:41:37 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -92,14 +92,14 @@ unsigned char unescape_single_char(unsigned char c);
* We use exclusive states for quoted strings, extended comments,
* and to eliminate parsing troubles for numeric strings.
* Exclusive states:
* <xbit> bit string literal
* <xb> bit string literal
* <xc> extended C-style comments - thomas 1997-07-12
* <xd> delimited identifiers (double-quoted identifiers) - thomas 1997-10-27
* <xh> hexadecimal numeric string - thomas 1997-11-16
* <xq> quoted strings - thomas 1997-07-30
*/
%x xbit
%x xb
%x xc
%x xd
%x xh
@@ -107,10 +107,10 @@ unsigned char unescape_single_char(unsigned char c);
/* Bit string
*/
xbitstart [bB]{quote}
xbitstop {quote}
xbitinside [^']*
xbitcat {quote}{whitespace_with_newline}{quote}
xbstart [bB]{quote}
xbstop {quote}
xbinside [^']*
xbcat {quote}{whitespace_with_newline}{quote}
/* Hexadecimal number
*/
@@ -285,13 +285,13 @@ other .
<xc><<EOF>> { yyerror("unterminated /* comment"); }
{xbitstart} {
{xbstart} {
token_start = yytext;
BEGIN(xbit);
BEGIN(xb);
startlit();
addlitchar('b');
}
<xbit>{xbitstop} {
<xb>{xbstop} {
BEGIN(INITIAL);
if (literalbuf[strspn(literalbuf + 1, "01") + 1] != '\0')
yyerror("invalid bit string input");
@@ -299,14 +299,14 @@ other .
return BITCONST;
}
<xh>{xhinside} |
<xbit>{xbitinside} {
<xb>{xbinside} {
addlit(yytext, yyleng);
}
<xh>{xhcat} |
<xbit>{xbitcat} {
<xb>{xbcat} {
/* ignore */
}
<xbit><<EOF>> { yyerror("unterminated bit string literal"); }
<xb><<EOF>> { yyerror("unterminated bit string literal"); }
{xhstart} {
token_start = yytext;