mirror of
https://github.com/postgres/postgres.git
synced 2025-08-28 18:48:04 +03:00
Add support for \x hex escapes in backend strings. Octal was already
supported. This follows the C standard escapes.
This commit is contained in:
@@ -1,5 +1,5 @@
|
|||||||
<!--
|
<!--
|
||||||
$PostgreSQL: pgsql/doc/src/sgml/syntax.sgml,v 1.99 2004/12/23 05:37:40 tgl Exp $
|
$PostgreSQL: pgsql/doc/src/sgml/syntax.sgml,v 1.100 2005/06/02 01:23:08 momjian Exp $
|
||||||
-->
|
-->
|
||||||
|
|
||||||
<chapter id="sql-syntax">
|
<chapter id="sql-syntax">
|
||||||
@@ -254,17 +254,18 @@ UPDATE "my_table" SET "a" = 5;
|
|||||||
|
|
||||||
<para>
|
<para>
|
||||||
Another <productname>PostgreSQL</productname> extension is that
|
Another <productname>PostgreSQL</productname> extension is that
|
||||||
C-style backslash escapes are available:
|
C-style backslash escapes are available: <literal>\b</literal> is a
|
||||||
<literal>\b</literal> is a backspace, <literal>\f</literal> is a
|
backspace, <literal>\f</literal> is a form feed,
|
||||||
form feed, <literal>\n</literal> is a newline,
|
<literal>\n</literal> is a newline, <literal>\r</literal> is a
|
||||||
<literal>\r</literal> is a carriage return, <literal>\t</literal>
|
carriage return, <literal>\t</literal> is a tab. Also supported is
|
||||||
is a tab, and <literal>\<replaceable>xxx</replaceable></literal>,
|
<literal>\<replaceable>digits</replaceable></literal>, where
|
||||||
where <replaceable>xxx</replaceable> is an octal number, is a
|
<replaceable>ddd</replaceable> represents an octal byte value, and
|
||||||
byte with the corresponding code. (It is your responsibility
|
<literal>\x<replaceable>hexdigits</replaceable></literal>, where
|
||||||
that the byte sequences you create are valid characters in the
|
<replaceable>hexdigits</replaceable> represents a hexadecimal byte value.
|
||||||
server character set encoding.) Any other character following a
|
(It is your responsibility that the byte sequences you create are
|
||||||
backslash is taken literally. Thus, to include a backslash in a
|
valid characters in the server character set encoding.) Any other
|
||||||
string constant, write two backslashes.
|
character following a backslash is taken literally. Thus, to
|
||||||
|
include a backslash in a string constant, write two backslashes.
|
||||||
</para>
|
</para>
|
||||||
|
|
||||||
<para>
|
<para>
|
||||||
|
@@ -24,7 +24,7 @@
|
|||||||
* Portions Copyright (c) 1994, Regents of the University of California
|
* Portions Copyright (c) 1994, Regents of the University of California
|
||||||
*
|
*
|
||||||
* IDENTIFICATION
|
* IDENTIFICATION
|
||||||
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.122 2005/05/26 01:24:29 tgl Exp $
|
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.123 2005/06/02 01:23:08 momjian Exp $
|
||||||
*
|
*
|
||||||
*-------------------------------------------------------------------------
|
*-------------------------------------------------------------------------
|
||||||
*/
|
*/
|
||||||
@@ -193,8 +193,9 @@ xnstart [nN]{quote}
|
|||||||
xqstart {quote}
|
xqstart {quote}
|
||||||
xqdouble {quote}{quote}
|
xqdouble {quote}{quote}
|
||||||
xqinside [^\\']+
|
xqinside [^\\']+
|
||||||
xqescape [\\][^0-7]
|
xqescape [\\][^0-7x]
|
||||||
xqoctesc [\\][0-7]{1,3}
|
xqoctesc [\\][0-7]{1,3}
|
||||||
|
xqhexesc [\\]x[0-9A-Fa-f]{1,2}
|
||||||
|
|
||||||
/* $foo$ style quotes ("dollar quoting")
|
/* $foo$ style quotes ("dollar quoting")
|
||||||
* The quoted string starts with $foo$ where "foo" is an optional string
|
* The quoted string starts with $foo$ where "foo" is an optional string
|
||||||
@@ -435,6 +436,10 @@ other .
|
|||||||
unsigned char c = strtoul(yytext+1, NULL, 8);
|
unsigned char c = strtoul(yytext+1, NULL, 8);
|
||||||
addlitchar(c);
|
addlitchar(c);
|
||||||
}
|
}
|
||||||
|
<xq>{xqhexesc} {
|
||||||
|
unsigned char c = strtoul(yytext+2, NULL, 16);
|
||||||
|
addlitchar(c);
|
||||||
|
}
|
||||||
<xq>{quotecontinue} {
|
<xq>{quotecontinue} {
|
||||||
/* ignore */
|
/* ignore */
|
||||||
}
|
}
|
||||||
|
Reference in New Issue
Block a user