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Satyam
----- Original Message -----
From: "Winfried Meining" <wim@xxxxxxxxx>
To: <php-general@xxxxxxxxxxxxx>
Sent: Sunday, April 09, 2006 10:20 PM
Subject: stripping enclosed text from PHP code
Hi,
I am writing on a script that parses a PHP script and finds all function
calls
to check, if these functions exist. To do this, I needed a function that
would
strip out all text, which is enclosed in apostrophes or quotation marks.
This
is somewhat tricky, as the script needs to be aware of what really is an
enclosed text and what is PHP code. Apostrophes in quotation mark enclosed
text
should be ignored and quotation marks in apostrophe enclosed text should
be
ignored, as well. Similarly, escaped apostrophes in apostrophe enclosed
text
and escaped quotation marks in quotation mark enclosed text should be
ignored.
The following function uses preg_match to do this job.
<?
function stripstrings($text) {
while (preg_match("/^(.*)(?<!\\\)('|\")(.*)$/", $text, $matches)) {
$front = $matches[1];
$lim = $matches[2];
$tail = $matches[3];
while (preg_match("/^(.*)(?<!\\\)('|\")(.*)$/", $front, $matches)) {
$front = $matches[1];
$tail = $matches[3] . $lim . $tail;
$lim = $matches[2];
}
if (!preg_match("/^(.*)(?<!\\\)$lim(.*)$/", $tail, $matches))
break;
$string = $matches[1];
$tail = $matches[2];
while (preg_match("/^(.*)(?<!\\\)$lim(.*)$/", $string, $matches)) {
$string = $matches[1];
$tail = $matches[2] . $lim . $tail;
}
$text = $front . $tail;
}
return($text);
}
?>
I noticed that this function is very slow, in particular because
preg_match("/^(.*)some_string(.*)$/", $text, $matches);
always seems to find the *last* occurrence of some_string and not the
*first*
(I would need the first). There is certainly a way to write another
version
where one looks at every single character when going through $text, but
this
would make the code much more complex.
I wonder, if there is a faster *and* simple way to do the same thing.
Is there btw a script freely available, which can parse PHP code and check
for
errors ?
Any help is highly appreciated.
Winfried
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