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pcre2grep: add $& as an alias for $0 (#519)

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Perl does not use $0 anymore to refer to the text of the matched subject
and `pcre2_substitute()` was recently updated to also provide that value
using the variable Perl prefers: `$&`.

In a similar context, either as part of the formatted output from a match
or during the processing of a callback, teach pcre2grep to also populate
$&.

While at it, update the ChangeLog with recent changes.
This commit is contained in:
Carlo Marcelo Arenas Belón
2024-10-09 01:08:27 -07:00
committed by GitHub
parent 223941425f
commit 0d087cce82
12 changed files with 265 additions and 247 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
NEWS
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@@ -52,7 +52,7 @@ a list). Those that are not bugfixes or code tidies are:
matches the "fullwidth" versions of hex digits. PCRE2_EXTRA_ASCII_DIGIT can matches the "fullwidth" versions of hex digits. PCRE2_EXTRA_ASCII_DIGIT can
be used to keep it ASCII only. be used to keep it ASCII only.
* Make PCRE2_UCP the default in UTF mode in pcre2grep and add -no_ucp, * Make PCRE2_UCP the default in UTF mode in pcre2grep and add --no-ucp,
--case-restrict and --posix-digit. --case-restrict and --posix-digit.
* Add --group-separator and --no-group-separator to pcre2grep. * Add --group-separator and --no-group-separator to pcre2grep.

2
RunGrepTest
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@@ -637,6 +637,8 @@ echo "RC=$?" >>testtrygrep
echo "---------------------------- Test 120 ------------------------------" >>testtrygrep echo "---------------------------- Test 120 ------------------------------" >>testtrygrep
(cd $srcdir; $valgrind $vjs $pcre2grep -HO '$0:$2$1$3' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep (cd $srcdir; $valgrind $vjs $pcre2grep -HO '$0:$2$1$3' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep
echo "RC=$?" >>testtrygrep echo "RC=$?" >>testtrygrep
(cd $srcdir; $valgrind $vjs $pcre2grep -HO '$&:$2$1$3' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep
echo "RC=$?" >>testtrygrep
(cd $srcdir; $valgrind $vjs $pcre2grep -m 1 -O '$0:$a$b$e$f$r$t$v' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep (cd $srcdir; $valgrind $vjs $pcre2grep -m 1 -O '$0:$a$b$e$f$r$t$v' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep
echo "RC=$?" >>testtrygrep echo "RC=$?" >>testtrygrep
(cd $srcdir; $valgrind $vjs $pcre2grep -HO '${X}' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep 2>&1 (cd $srcdir; $valgrind $vjs $pcre2grep -HO '${X}' '(\w+) binary (\w+)(\.)?' ./testdata/grepinput) >>testtrygrep 2>&1

18
doc/html/pcre2grep.html
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@@ -724,9 +724,9 @@ text.
<br> <br>
<br> <br>
$&#60;digits&#62; or ${&#60;digits&#62;} is replaced by the captured substring of the given $&#60;digits&#62; or ${&#60;digits&#62;} is replaced by the captured substring of the given
decimal number; zero substitutes the whole match. If the number is greater than decimal number; $& (or the legacy $0) substitutes the whole match. If the
the number of capturing substrings, or if the capture is unset, the replacement number is greater than the number of capturing substrings, or if the capture
is empty. is unset, the replacement is empty.
<br> <br>
<br> <br>
$a is replaced by bell; $b by backspace; $e by escape; $f by form feed; $n by $a is replaced by bell; $b by backspace; $e by escape; $f by form feed; $n by
@@ -1025,9 +1025,9 @@ available, provided that callouts were not completely disabled when
zero-terminated string, which means it should not contain any internal binary zero-terminated string, which means it should not contain any internal binary
zeros. It is written to the output, having first been passed through the same zeros. It is written to the output, having first been passed through the same
escape processing as text from the <b>--output</b> (<b>-O</b>) option (see escape processing as text from the <b>--output</b> (<b>-O</b>) option (see
above). However, $0 cannot be used to insert a matched substring because the above). However, $0 or $& cannot be used to insert a matched substring because
match is still in progress. Instead, the single character '0' is inserted. Any the match is still in progress. Instead, the single character '0' is inserted.
syntax errors in the string (for example, a dollar not followed by another Any syntax errors in the string (for example, a dollar not followed by another
character) causes the callout to be ignored. No terminator is added to the character) causes the callout to be ignored. No terminator is added to the
output string, so if you want a newline, you must include it explicitly using output string, so if you want a newline, you must include it explicitly using
the escape $n. For example: the escape $n. For example:
@@ -1057,9 +1057,9 @@ arguments:
</pre> </pre>
Any substring (including the executable name) may contain escape sequences Any substring (including the executable name) may contain escape sequences
started by a dollar character. These are the same as for the <b>--output</b> started by a dollar character. These are the same as for the <b>--output</b>
(<b>-O</b>) option documented above, except that $0 cannot insert the matched (<b>-O</b>) option documented above, except that $0 or $& cannot insert the
string because the match is still in progress. Instead, the character '0' matched string because the match is still in progress. Instead, the character
is inserted. If you need a literal dollar or pipe character in any '0' is inserted. If you need a literal dollar or pipe character in any
substring, use $$ or $| respectively. Here is an example: substring, use $$ or $| respectively. Here is an example:
<pre> <pre>
echo -e "abcde\n12345" | pcre2grep \ echo -e "abcde\n12345" | pcre2grep \

2
doc/pcre2demo.3
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@@ -1,4 +1,4 @@
.TH PCRE2DEMO 3 " 4 October 2024" "PCRE2 10.44" .TH PCRE2DEMO 3 " 8 October 2024" "PCRE2 10.44"
.\"AUTOMATICALLY GENERATED BY PrepareRelease - do not EDIT! .\"AUTOMATICALLY GENERATED BY PrepareRelease - do not EDIT!
.SH NAME .SH NAME
PCRE2DEMO - A demonstration C program for PCRE2 PCRE2DEMO - A demonstration C program for PCRE2

18
doc/pcre2grep.1
View File

@@ -629,9 +629,9 @@ contents of the matched part of the line and/or captured substrings into the
text. text.
.sp .sp
$<digits> or ${<digits>} is replaced by the captured substring of the given $<digits> or ${<digits>} is replaced by the captured substring of the given
decimal number; zero substitutes the whole match. If the number is greater than decimal number; $& (or the legacy $0) substitutes the whole match. If the
the number of capturing substrings, or if the capture is unset, the replacement number is greater than the number of capturing substrings, or if the capture
is empty. is unset, the replacement is empty.
.sp .sp
$a is replaced by bell; $b by backspace; $e by escape; $f by form feed; $n by $a is replaced by bell; $b by backspace; $e by escape; $f by form feed; $n by
newline; $r by carriage return; $t by tab; $v by vertical tab. newline; $r by carriage return; $t by tab; $v by vertical tab.
@@ -914,9 +914,9 @@ available, provided that callouts were not completely disabled when
zero-terminated string, which means it should not contain any internal binary zero-terminated string, which means it should not contain any internal binary
zeros. It is written to the output, having first been passed through the same zeros. It is written to the output, having first been passed through the same
escape processing as text from the \fB--output\fP (\fB-O\fP) option (see escape processing as text from the \fB--output\fP (\fB-O\fP) option (see
above). However, $0 cannot be used to insert a matched substring because the above). However, $0 or $& cannot be used to insert a matched substring because
match is still in progress. Instead, the single character '0' is inserted. Any the match is still in progress. Instead, the single character '0' is inserted.
syntax errors in the string (for example, a dollar not followed by another Any syntax errors in the string (for example, a dollar not followed by another
character) causes the callout to be ignored. No terminator is added to the character) causes the callout to be ignored. No terminator is added to the
output string, so if you want a newline, you must include it explicitly using output string, so if you want a newline, you must include it explicitly using
the escape $n. For example: the escape $n. For example:
@@ -945,9 +945,9 @@ arguments:
.sp .sp
Any substring (including the executable name) may contain escape sequences Any substring (including the executable name) may contain escape sequences
started by a dollar character. These are the same as for the \fB--output\fP started by a dollar character. These are the same as for the \fB--output\fP
(\fB-O\fP) option documented above, except that $0 cannot insert the matched (\fB-O\fP) option documented above, except that $0 or $& cannot insert the
string because the match is still in progress. Instead, the character '0' matched string because the match is still in progress. Instead, the character
is inserted. If you need a literal dollar or pipe character in any '0' is inserted. If you need a literal dollar or pipe character in any
substring, use $$ or $| respectively. Here is an example: substring, use $$ or $| respectively. Here is an example:
.sp .sp
echo -e "abcde\en12345" | pcre2grep \e echo -e "abcde\en12345" | pcre2grep \e

30
doc/pcre2grep.txt
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@@ -702,10 +702,10 @@ OPTIONS
captured substrings into the text. captured substrings into the text.
$<digits> or ${<digits>} is replaced by the captured sub- $<digits> or ${<digits>} is replaced by the captured sub-
string of the given decimal number; zero substitutes the string of the given decimal number; $& (or the legacy $0)
whole match. If the number is greater than the number of cap- substitutes the whole match. If the number is greater than
turing substrings, or if the capture is unset, the replace- the number of capturing substrings, or if the capture is un-
ment is empty. set, the replacement is empty.
$a is replaced by bell; $b by backspace; $e by escape; $f by $a is replaced by bell; $b by backspace; $e by escape; $f by
form feed; $n by newline; $r by carriage return; $t by tab; form feed; $n by newline; $r by carriage return; $t by tab;
@@ -998,13 +998,13 @@ USING PCRE2'S CALLOUT FACILITY
processed as a zero-terminated string, which means it should not con- processed as a zero-terminated string, which means it should not con-
tain any internal binary zeros. It is written to the output, having tain any internal binary zeros. It is written to the output, having
first been passed through the same escape processing as text from the first been passed through the same escape processing as text from the
--output (-O) option (see above). However, $0 cannot be used to insert --output (-O) option (see above). However, $0 or $& cannot be used to
a matched substring because the match is still in progress. Instead, insert a matched substring because the match is still in progress. In-
the single character '0' is inserted. Any syntax errors in the string stead, the single character '0' is inserted. Any syntax errors in the
(for example, a dollar not followed by another character) causes the string (for example, a dollar not followed by another character) causes
callout to be ignored. No terminator is added to the output string, so the callout to be ignored. No terminator is added to the output string,
if you want a newline, you must include it explicitly using the escape so if you want a newline, you must include it explicitly using the es-
$n. For example: cape $n. For example:
pcre2grep '(.)(..(.))(?C"|[$1] [$2] [$3]$n")' <some file> pcre2grep '(.)(..(.))(?C"|[$1] [$2] [$3]$n")' <some file>
@@ -1028,10 +1028,10 @@ USING PCRE2'S CALLOUT FACILITY
Any substring (including the executable name) may contain escape se- Any substring (including the executable name) may contain escape se-
quences started by a dollar character. These are the same as for the quences started by a dollar character. These are the same as for the
--output (-O) option documented above, except that $0 cannot insert the --output (-O) option documented above, except that $0 or $& cannot in-
matched string because the match is still in progress. Instead, the sert the matched string because the match is still in progress. In-
character '0' is inserted. If you need a literal dollar or pipe charac- stead, the character substring, use $$ or $| respectively. Here is an
ter in any substring, use $$ or $| respectively. Here is an example: example:
echo -e "abcde\n12345" | pcre2grep \ echo -e "abcde\n12345" | pcre2grep \
'(?x)(.)(..(.)) '(?x)(.)(..(.))

20
src/pcre2grep.c
View File

@@ -2024,11 +2024,23 @@ switch (*(++string))
*last = string; *last = string;
return DDE_ERROR; return DDE_ERROR;
case '&':
/* In a callout, no capture is available. Return the character '0' for
consistency with $0. */
if (callout) *value = '0';
else
{
*value = 0;
rc = DDE_CAPTURE;
}
break;
case '{': case '{':
brace = TRUE; brace = TRUE;
string++; string++;
if (!isdigit((unsigned char)(*string))) /* Syntax error: a decimal number required. */ if (!isdigit((unsigned char)(*string))) /* Syntax error: */
{ { /* a decimal number required. */
if (!callout) if (!callout)
fprintf(stderr, "pcre2grep: Error in output text at offset %d: %s\n", fprintf(stderr, "pcre2grep: Error in output text at offset %d: %s\n",
(int)(string - begin), "decimal number expected"); (int)(string - begin), "decimal number expected");
@@ -2105,9 +2117,9 @@ switch (*(++string))
{ {
if (!isxdigit(*string)) break; if (!isxdigit(*string)) break;
if (*string >= '0' && *string <= '9') if (*string >= '0' && *string <= '9')
c = c *16 + *string++ - '0'; c = c *16 + (*string++ - '0');
else else
c = c * 16 + (*string++ | 0x20) - 'a' + 10; c = c * 16 + ((*string++ | 0x20) - 'a') + 10;
} }
*value = c; *value = c;
string--; /* Point to last digit */ string--; /* Point to last digit */

4
testdata/grepoutput vendored
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@@ -876,6 +876,10 @@ RC=0
./testdata/grepinput:a binary zero:zeroa ./testdata/grepinput:a binary zero:zeroa
./testdata/grepinput:the binary zero.:zerothe. ./testdata/grepinput:the binary zero.:zerothe.
RC=0 RC=0
./testdata/grepinput:the binary zero.:zerothe.
./testdata/grepinput:a binary zero:zeroa
./testdata/grepinput:the binary zero.:zerothe.
RC=0
the binary zero.: the binary zero.:
RC=0 RC=0