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Home: Perl Programming Help: Regular Expressions:
List tag closing in hierarchical way


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Jan 6, 2012, 5:56 PM

Post #1 of 2 (7686 views)
List tag closing in hierarchical way Can't Post

Hi guru's

i'm very newer to Perl,i need all ur's help to complete my task.
i want to close the list tags in hierarchical manner,there may any numbers of inner list tags in different listing styles
for e.g

<P_list-bull(1)>Use Microsoft Windows accessibility </P_list-bull(1)>
<P_list-simple(2)> Magnify the display </P_list-simple(2)>
<P_list-simple(2)> Change the size of text and icons </P_list-simple
<P_list-simple(2)> Convert the text displayed </P_list-simple(2)>
<P_list-simple(2)> Change the contrast </P_list-simple(2)>
<P_list-simple(2)> Display an onscreen keyboard </P_list-simple(2)>
<P_list-simple(2)> Convert the mouse for left-handed use. </P_list-s
<P_list-bull(1)>Deliver learning through </P_list-bull(1)>
<P_list-bull(1)>Increase the character . </P_list-bull(1)>
<P_list-bull(1)> fonts to assist dyslexic learners. </P_list-bull(1)>
<P_list-bull(1)>Adjust background colours </P_list-bull(1)>

and my result should be generate like the below code

<list list-type="bullet">  
<list-item><p>Use Microsoft Windows accessibility options to:
<list list-type="simple">
<list-item><p> Magnify the display</p></list-item>
<list-item><p> Change the size of text and icons</p></list-item>
<list-item><p> Convert the text displayed into speech (i.e. narrator)</p></list-item>
<list-item><p> Change the contrast</p></list-item>
<list-item><p> Display an onscreen keyboard</p></list-item>
<list-item><p> Convert the mouse for left-handed use.</p></list-item>
<list-item><p>Deliver learning through </p></list-item>
<list-item><p>Increase the character </p></list-item>
<list-item><p> fonts to assist dyslexic learners.</p></list-item>
<list-item><p> Adjust background colours</p></list-item>

pls any one suggest me an idea to solve my problem
thank u


Jan 9, 2012, 2:16 AM

Post #2 of 2 (7623 views)
Re: [mahalakshmi] List tag closing in hierarchical way [In reply to] Can't Post

First, I think you made a mistake when posting the desired result, because it is not well-formed (there is one </list-item> missing).
Please correct this, so that we can understand your problem better.

If I understand you correctly, your input data (<P_Normal>...) is XML, and the result is also XML. Since nested structures are difficult to deal with using regular expressions, I suggest a different approach: To parse the XML code and generate new XML.

You could do this with XML::Simple from CPAN (which can do reading and writing), or with XML::Parser and XML::Writer. I personally worked only with XML::Simple, but this module has its limitations, and many experienced developers recommend XML::Parser instead. Maye you can try both and see what is better suited for you.

In both cases, the XML structure will be transformed into a hash, where the XML tags end up as hash keys. You would then transform this "hash tree" (by replacing the old tags by new ones) and then write the XML tree.


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