lxml/etree/XSLT and dynamic stylesheet variables
I'm using etree to perform XSLT transforms, such as - from lxml import etree source = etree.parse(self.rfile) xslt = etree.fromstring(self._xslt) transform = etree.XSLT(xslt) result = transform(source) according to the docs at <http://lxml.de/xpathxslt.html#stylesheet-parameters> I can pass a dictionary of parameters to transform, such as - result = transform(doc_root, **{'non-python-identifier': '5'}) Can I pass a dictionary-like object? That doesn't seem to be working. I need to perform dynamic lookup of variables for the stylesheet. I've subclassed dictionary and overloaded [], get, has_key, and in to perform the required lookups; these work in testing. But passing the object to transform doesn't work. If that isn't possible is there an alternate XSLT implementation for python that would allow calling back for variable values?
On Fri, 2012-01-20 at 17:54 -0500, Adam Tauno Williams wrote:
I'm using etree to perform XSLT transforms, such as - from lxml import etree source = etree.parse(self.rfile) xslt = etree.fromstring(self._xslt) transform = etree.XSLT(xslt) result = transform(source) according to the docs at <http://lxml.de/xpathxslt.html#stylesheet-parameters> I can pass a dictionary of parameters to transform, such as - result = transform(doc_root, **{'non-python-identifier': '5'}) Can I pass a dictionary-like object? That doesn't seem to be working.
A copy is made of the dictionary so subclassing the dictionary passed in doesn't accomplish anything.
I need to perform dynamic lookup of variables for the stylesheet.
The LXML extensions supported provided what I needed <http://lxml.de/extensions.html> A stupid test case / example for anyone interested: from lxml import etree class MyExt: def __init__(self, languages): self._languages = languages def languagelookup(self, _, arg): language = self._languages.get(arg) if not language: return 'undefined' return language extensions = etree.Extension( MyExt(languages={ 'ES': 'Spanish', 'EL': 'Greek', 'DE': 'German', 'EN': 'English' } ), ( 'languagelookup', ), ns='847fe241-df88-45c6-b4a7' ) text = '''<documents> <document> <id>109</id> <category>OP</category> <title>Revolt Of The Masses</title> <author>Jose Ortega y Gasset</author> <published>1930</published> <language translator="anonymous">ES</language> </document> <document> <id>108</id> <category>P</category> <title>Meditations</title> <author>Marcus Aurelius</author> <language translator="Maxwell Staniforth">EL</language> <published>1930</published> </document> <document> <id>425</id> <category>OP</category> <title>The Communist Manifesto</title> <author>Karl Marx</author> <author>Friedrich Engels</author> <language translator="Samuel Moore">DE</language> <published>1914</published> </document> <document> <id>507</id> <category>POT</category> <title>The Cathedral & The Bazaar</title> <author>Eric S. Raymond</author> <published>199</published> </document> </documents>''' source = etree.fromstring(text) style ='''<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ext="847fe241-df88-45c6-b4a7"> <xsl:output method="text"/> <xsl:template match="/documents/document"> <xsl:value-of select="id"/> <xsl:text>,"</xsl:text> <xsl:value-of select="author"/> <xsl:text>","</xsl:text> <xsl:value-of select="ext:languagelookup(string(language))"/> <xsl:text>"</xsl:text> </xsl:template> </xsl:stylesheet>''' xslt = etree.XSLT(etree.XML(style), extensions=extensions) print xslt(source) -- Adam Tauno Williams <http://www.whitemiceconsulting.com> System Administrator, OpenGroupware Developer, LPI / CNA Fingerprint 8C08 209A FBE3 C41A DD2F A270 2D17 8FA4 D95E D383
participants (1)
-
Adam Tauno Williams