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From "Helma van der Linden (JIRA)" <j...@apache.org>
Subject [jira] Closed: (COCOON-1523) [PATCH] XSP expressions (attribute value/text interpolation)
Date Tue, 25 Oct 2005 14:09:01 GMT
     [ http://issues.apache.org/jira/browse/COCOON-1523?page=all ]
     
Helma van der Linden closed COCOON-1523:
----------------------------------------

    Resolution: Fixed

> [PATCH] XSP expressions (attribute value/text interpolation)
> ------------------------------------------------------------
>
>          Key: COCOON-1523
>          URL: http://issues.apache.org/jira/browse/COCOON-1523
>      Project: Cocoon
>         Type: Bug
>   Components: Blocks: XSP
>     Versions: 2.1.8-dev (Current SVN)
>  Environment: Operating System: other
> Platform: Other
>     Reporter: Jochen Kuhnle
>     Assignee: Cocoon Developers Team
>  Attachments: xsp-expressions.patch
>
> In [1] in we discussed an XSP expression syntax for attribute value and text
> expressions. This patch makes expressions available.
> In XSP, you now can write:
> <elem attrib="{#expression}" which will be expanded to:
> <elem><xsp:attribute
> name="attrib"><xsp:expr>expression</xsp:expr><xsp:attribute></elem>
> or
> <elem>Hello #user.getFullName</elem>, which will be expanded to <elem>Hello
> <xsp:expr>user.getFullName</xsp:expr></elem>
> Writing {##text} will prevent expansion and will be replaced by the text
> "{#text}". Inside expressions, write "##" to get "#" and "#}" to get "}".
> This works in XSPs as well as logicsheets. The '#' was chosen out of the
> discussed characters because it is IMO least likely to occur in an expression in
> the used languages.
> This feature is turned on by default and can be turned off by setting
> "attribute-value-interpolation" or "text-interpolation" to "false" in cocon.xconf:
> <markup-languages>
>     <xsp-language ... attribute-value-interpolation="false"
> text-interpolation="false">
>         ...
>     </xsp-language>
> </markup-language>
> It can be turned on or off on a per-XSP-/logicsheet-basis by setting attributes
> "attribute-value-interpolation" or "text-interpolation" of the top level element
> to true or false. Note that these attributes must belong to the
> "http://apache.org/xsp" namespace.
> How it works:
> New class XSPExpressionParser is a parser for the expressions. New class
> XSPExpressionFilter is a filter that gets SAX events with embedded expressions
> and generates SAX events for expanded expressions. This is used in LogicSheet to
> filter read logicsheers and in XSPMarkupLanguage to filter the XSP.
> Changes to existing code.
> LogicSheets need to know the namespace and uri of the markup language in order
> to replace expressions. Therefor AbstractMarkupLanguage needs to know this when
> reading logicsheets. This meant that I had to move this configuration
> information from parametrize to configure. It is unclear to me anyway, why
> AbstractMarkupLanguage used both methods at the same time (which are described
> as "incompatible" in the Avalon documentation).
> The old PreProcessFilter wraps text() nodes in <xsp:text> elements inside some
> tags (See [2]). It is unclear to me why this was done, and all XSPs I've tested
> worked without this. I got no reponse on the list, so I left this feature out of
> the new PreProcessFilter.
> If any of the above changes need further discussion, clarification or change,
> please tell me and I'll update the patch.
> This patch also should be applied to 2.2. If it does not work, again please tell
> me and I'll make a 2.2 patch available.
> [1] http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=111693513631888&w=2
> [2] http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=111778627925208&w=2

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