[jira] Updated: (DOXIA-226) Make XML based parsers better handle whitespace

["Vincent Siveton (JIRA)" <ji...@codehaus.org>]

     [ http://jira.codehaus.org/browse/DOXIA-226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vincent Siveton updated DOXIA-226:
----------------------------------

    Fix Version/s:     (was: 1.0-beta-1)
                   1.0-beta-2

> Make XML based parsers better handle whitespace
> -----------------------------------------------
>
>                 Key: DOXIA-226
>                 URL: http://jira.codehaus.org/browse/DOXIA-226
>             Project: Maven Doxia
>          Issue Type: Improvement
>            Reporter: Benjamin Bentmann
>             Fix For: 1.0-beta-2
>
>
> Regarding whitespace in XML documents, one needs to consider the following aspects:
> - ignorable whitespace, i.e. view "{{<tr> <td/> </tr>}}" and "{{<tr><td/></tr>}}" as equivalent
> - collapsible whitespace, i.e. view "{{Text &nbsp; Text}}" and "{{Text Text}}" as equivalent
> - trimmable whitespace, i.e. view "{{<p>  Text  </p>}}" and "{{<p>Text</p>}}" as equivalent
> Those distinctions require a DTD/XSD in combination with a validating parser and/or application-specific knowledge. For robustness, doxia parsers for XML-based formats should not depend on the existence of a schema definition such that they reliably deliver events into the sinks. Hence I suggest to hard-code the required logic for proper whitespace handling into each parser.
> Currently, whitespace handling is rather static, e.g. {{XhtmlBaseParser}} pushes all input whitespace into the sink. This might cause troubles with sinks that are not expected to receive ignorable whitespace. To address this issue, it seems helpful if {{AbstractXmlParser}} provided a default implementation of {{handleText()}} that subclasses can simply control via state flags instead of implementing {{handleText()}} from scratch in each parser. Copy&Paste - which caused DOXIA-225 - needs to be avoided.
> More precisely, I image the following changes:
> - Have {{AbstractXmlParser}} maintain a stack of tuples (ignorable, collapsible, trimmable) where each tuple describes the whitespace handling for the currently parsed element
> - Have {{AbstractXmlParser}} push/pop a tuple from this stack before/after calling {{handleStartTag()}}/{{handleEndTag()}}
> - Have {{AbstractXmlParser}} provide setters to allow subclasses to control the desired whitespace handling in their {{handleStartTag()}} implementation
> - Have {{AbstractXmlParser}} implement {{handleText()}} where it evalutes the top-most tuple from the stack

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