ID: 30257
Updated by: rrichards@php.net
Reported By: christoffer at natlikan dot se
-Status: Assigned
+Status: Bogus
Bug Type: XML related
Operating System: *
PHP Version: 5CVS-2005-02-02
Assigned To: rrichards
New Comment:
It's a libxml issue and wasnt able to find a way to work around any of
these. I have a list of issues going I'll be submitting for
documentation.
Previous Comments:
------------------------------------------------------------------------
[2005-08-06 01:34:17] sniper@php.net
Rob, you had some nice explanation about this, iirc?
IIRC, this is libxml issue, not something we can fix?
------------------------------------------------------------------------
[2005-08-04 11:44:37] vrana@php.net
It's so weird that it should be rather fixed than documented:
All functions point to the end of a tag instead of beginning. (it can
be documented)
xml_get_current_byte_index() and xml_get_current_column_number() behave
unpredictable (it should be fixed):
<?xml version='1.0' encoding='us-ascii'?><a></a> CN=42, BI=4
<?xml version='1.0' encoding='us-ascii' ?><a></a> CN=42, BI=5
<?xml version='1.0' encoding='us-ascii'?><a></a> CN=42, BI=4
<?xml version='1.0' encoding='utf-8'?><a></a> CN=39, BI=40
Another problem is with attribute values and whitespace. They are not
counted to CN (it should be fixed):
<?xml version='1.0' encoding='utf-8'?><a b=''></a>
CN=41, BI=45
<?xml version='1.0' encoding='utf-8'?> <a b=''></a>
CN=41, BI=46
<?xml version='1.0' encoding='utf-8'?><a b=''></a>
CN=41, BI=46
<?xml version='1.0' encoding='utf-8'?><a
b='cde'></a> CN=41, BI=48
Such a weird behavior is nearly undocumentable and unusable for sure.
------------------------------------------------------------------------
[2005-08-01 00:37:06] sniper@php.net
This difference is caused by the fact that in PHP5 we use libxml
instead of expat by default.
To get the expat behaviour, you can always compile PHP with
--with-expat-dir=/path/to/expat
This change in behaviour needs to be documented though.
------------------------------------------------------------------------
[2004-09-30 01:27:16] olivier at samalyse dot com
I'm experiencing similar troubles with xml_get_current_byte_index().
But I don't agree with the expected result christoffer proposes.
Actually, in php4 xml_get_current_byte_index() behaves perfectly to me.
Using the test code below with php version 4.3.4 produces :
ElementOpen - Row: 2 Col: 0 BIndex: 44
ElementOpen - Row: 4 Col: 1 BIndex: 61
ElementOpen - Row: 5 Col: 2 BIndex: 67
ElementClose - Row: 5 Col: 8 BIndex: 73
ElementClose - Row: 6 Col: 1 BIndex: 79
ElementClose - Row: 7 Col: 0 BIndex: 84
Byte Index 44 points at the beginning of the <a> tag :
<a b="x">
^
That is fine.
Now, if you omit the xml declaration '<?xml version="1.0"
encoding="ISO-8859-1"?>', using php5, you will obtain :
ElementOpen - Row: 1 Col: 5 BIndex: 8
ElementOpen - Row: 3 Col: 8 BIndex: 19
ElementOpen - Row: 4 Col: 11 BIndex: 25
ElementClose - Row: 4 Col: 15 BIndex: 33
ElementClose - Row: 5 Col: 18 BIndex: 39
ElementClose - Row: 6 Col: 21 BIndex: 44
Byte index 8 does not point at the beginning of the tag anymore, but at
its end :
<a b="x">
^
In my particular case (XML indexing/marshalling) that's far less
usable. Some may consider that's no bug, but it breaks backward
compatibility with php4.
Now, if you let the xml declaration in place, this function does not
produce anything relevant anymore. As Christoffer reports, parsing this
xml document when it includes '<?xml version="1.0"
encoding="ISO-8859-1"?>' will produce :
ElementOpen - Row: 2 Col: 5 BIndex: 11
ElementOpen - Row: 4 Col: 8 BIndex: 22
ElementOpen - Row: 5 Col: 11 BIndex: 28
ElementClose - Row: 5 Col: 15 BIndex: 36
ElementClose - Row: 6 Col: 18 BIndex: 42
ElementClose - Row: 7 Col: 21 BIndex: 47
In this later case, what seems to happen is that the xml declaration
byte length is badly evaluated. If you add to this the fact that the
returned byte index points at the end of the tag (php5) instead of the
beginning of the tag (php4), it really starts to look like random
output...
------------------------------------------------------------------------
[2004-09-27 20:36:13] christoffer at natlikan dot se
Description:
------------
xml_get_current_byte_index and xml_get_current_column_number returns
unexpected values when the XML contains a XML declaration. Using
php5.0-win32-200409270830 and Apache/1.3.31.
Reproduce code:
---------------
<?php
function elementOpen($parser, $elementName, $attributes) {
echo("ElementOpen - Row: " . xml_get_current_line_number($parser) .
" Col: " . xml_get_current_column_number($parser) .
" BIndex: " . xml_get_current_byte_index($parser) . "<br />");
}
function elementClose($parser, $elementName) {
echo("ElementClose - Row: " . xml_get_current_line_number($parser) .
" Col: " . xml_get_current_column_number($parser) .
" BIndex: " . xml_get_current_byte_index($parser) . "<br />");
}
$parser = xml_parser_create();
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($parser, "elementOpen", "elementClose");
$xml =
"<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n" .
"<a b=\"x\">\n" .
"\ttest\n" .
"\t<c>\n" .
"\t\t<d>foo</d>\n" .
"\t</c>\n" .
"</a>";
xml_parse($parser, $xml);
xml_parser_free($parser);
?>
Expected result:
----------------
ElementOpen - Row: 2 Col: 10 BIndex: 52
ElementOpen - Row: 4 Col: 8 BIndex: 63
ElementOpen - Row: 5 Col: 11 BIndex: 69
ElementClose - Row: 5 Col: 9 BIndex: 73
ElementClose - Row: 6 Col: 2 BIndex: 79
ElementClose - Row: 7 Col: 1 BIndex: 85
Actual result:
--------------
ElementOpen - Row: 2 Col: 5 BIndex: 11
ElementOpen - Row: 4 Col: 8 BIndex: 22
ElementOpen - Row: 5 Col: 11 BIndex: 28
ElementClose - Row: 5 Col: 15 BIndex: 36
ElementClose - Row: 6 Col: 18 BIndex: 42
ElementClose - Row: 7 Col: 21 BIndex: 47
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=30257&edit=1