From: [email protected]
[mailto:[email protected]] On Behalf Of
Paul Rousseau
Sent: 04 February 2010 16:44
To: perl Win32-users
Subject: HTML Parsing Question
> Hello,
>
> I have an HTML file that contains the following snippet:
>
> <group name="Group1" visible="true" wallpaper="false" toolTipText=""
exposeToVba="notExposed"
> isReferenceObject="true" linkSize="true" linkConnections="true"
> linkAnimations="linkWithoutExpression"
linkBaseObject="System_Bar.Group1">
> <button name="Button1" height="25" width="85" left="8"
top="10" visible="true" toolTipText=""
> exposeToVba="notExposed" isReferenceObject="true" linkSize="true"
linkConnections="true"
> linkAnimations="linkWithoutExpression"
linkBaseObject="System_Bar.Button1" style="recessed"
> captureCursor="false" highlightOnFocus="true" tabIndex="1">
> <command pressAction="Display Overview" repeatAction=""
releaseAction=""
> repeatRate="0.25"/>
> <up patternColor="black" patternStyle="none"
backColor="#ECE9D8" backStyle="solid"
> foreColor="black">
> <caption fontFamily="Arial" fontSize="8" bold="true"
italic="false" underline="false"
> strikethrough="false" caption="Overviews"/>
> <imageSettings imageReference="noImage"/>
> </up>
> <down downSameAsUp="true" patternColor="black"
patternStyle="none" backColor="#ECE9D8"
> backStyle="solid" foreColor="black">
> <caption fontFamily="Arial" fontSize="10" bold="false"
italic="false"
> underline="false" strikethrough="false" caption=""/>
> <imageSettings imageReference="noImage"/>
> </down>
> </button>
> <button name="Button24" height="25" width="85" left="95"
top="10" visible="true"
> toolTipText="" exposeToVba="notExposed" isReferenceObject="true"
linkSize="true"
> linkConnections="true" linkAnimations="linkWithoutExpression"
linkBaseObject="System_Bar.Button24"
> style="recessed" captureCursor="false" highlightOnFocus="true"
tabIndex="2">
> <command pressAction="Display Oil_Treating_Overview"
repeatAction="" releaseAction=""
> repeatRate="0.25"/>
> <up patternColor="black" patternStyle="none"
backColor="#ECE9D8" backStyle="solid"
> foreColor="black">
> <caption fontFamily="Arial" fontSize="8" bold="true"
italic="false" underline="false"
> strikethrough="false" caption="Oil Treating"/>
> <imageSettings imageReference="noImage"/>
> </up>
> <down downSameAsUp="true" patternColor="black"
patternStyle="none" backColor="#ECE9D8"
> backStyle="solid" foreColor="black">
> <caption fontFamily="Arial" fontSize="10" bold="false"
italic="false"
> underline="false" strikethrough="false" caption=""/>
> <imageSettings imageReference="noImage"/>
> </down>
> </button>
> .
> .
> .
> </group>
I'm not an html expert, but is 'group' a valid tag? The parser seems to
be silently ignoring it. It works if you change it group to form.
> I want to obtain the parent name for all "button" tags. I am having
trouble extracting the parent
> name. For example, I can find "Button1" and "Button24" but I can not
get to either item's parent name, > "Group1".
> Here is my code so far. (I believe it's something trivial; I feel I am
so close.)
>
> foreach $filename (@filenames)
> {
> print "filename is $filename";
> $tree = HTML::TreeBuilder->new();
> $tree->parse_file("$sourcedir\\$filename");
> @Ans = $tree->look_down('_tag' => 'button');
> foreach $button (@Ans)
> {
> print "button is " . $button->attr('name'); # prints "button
is Button1"
> print "button tag is " . $button->tag; # can also use
${$button}{_tag} # prints "button tag is
> button"
> print "button parent hash pointer is " . $button->parent; # can also
use ${$button}{_parent} #
> prints "button parent hash pointer is HTML::Element=HASH(0x1afa5c4)"
> #
> #print Dumper($button->parent);
> #
> foreach $key (keys %{$button->parent})
> {
> print "key is $key"; # prints four keys: _parent,
_content, _tag, _implicit
> }
> print "button _parent value is " . ${$button}{_parent}; # prints
"button _parent value is
> HTML::Element=HASH(0x1afa5c4)"
> print "button _tag value is " . ${$button}{_tag}; # prints "button
_tag value is button"
>
> $parent = $button->parent;
> print "parent tag is " . ${$parent}{_tag}; # prints "parent
tag is body"
> print "parent content is " . ${$parent}{_content}; # prints "parent
content is ARRAY(0x1afa7b0)"
> foreach $key (@{${$parent}{_content}})
> {
> # print "content item is $key";
> }
> #print "parent name is " . $parent->attr('name');
> $groupid = $button->look_up('_tag', => 'group');
> # print "group id is " . $groupid;
> } Alw2ays
> # $tree->dump;
> # print $tree->as_HTML;
> }
Apart from your code being poorly laid out (which may well be the result
of emailing), you appear to either not be using 'use strict;' or you are
declaring variables in a larger scope than necessary. Both of which are
not recommended, if you will excuse the double negative. Always code
with 'use strict; use warnings;' at the top of your code, and declare
variables in the smallest scope necessary.
HTH
--
Brian Raven
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