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Re^3: XML::Simple giving a non-specific error

by Anonymous Monk
on Mar 12, 2010 at 00:23 UTC ( #828169=note: print w/ replies, xml ) Need Help??

in reply to Re^2: XML::Simple giving a non-specific error
in thread XML::Simple giving a non-specific error

That's not the case, as seen in the update to my post.

Your update shows how LibXML, a parser which builds a tree (takes more memory), can provide better error messages than a simpler parser like expat.

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Re^4: XML::Simple giving a non-specific error
by ikegami (Pope) on Mar 12, 2010 at 00:30 UTC
    You seem to be implying that the fact that it builds a tree is relevant (if XML::LibXML::SAX even builds a tree). It's not. To be able to provide the error message it already provides, the parser needs a list of unclosed elements.
    my @unclosed = ( 'ROOT', 'ERROR', 'ERROR', );
    All that's needed to provide a better error message is to note a line number along with the name of the element.
    my @unclosed = ( [ 'ROOT', 3 ], [ 'ERROR', 8 ], [ 'ERROR', 8 ], );

    Yes, it uses extra memory, but 1) it doesn't add to the magnitude (O()) of the memory used, 2) the maximum used is proportional to the depth of tree and they're usually quite shallow (20?).

    As for expat being simpler, its actually almost identical to SAX. It wouldn't surprise me if one inspired the other.

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