RuntimeError executing stylesheet with Amara 2.0.0a6 on Python 2.7.5

Chimezie Ogbuji

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Aug 17, 2014, 9:56:43 PM8/17/14

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Hello.

I recently updated my Macbook pro to OSX 10.9.4 and had to reinstall all the components I use for an Akara / Amara / Akamu web application I deploy for medical information management. In short, when I try to run the amara.xslt.transform method on the following XML source (gutted in order to try to isolate the problem):

<Root/>

I get the traceback at the bottom of the page.

The deployed, production web application does not reproduce this when I try to transform the exact same source document with the same XSLT source (which is attached to this email for reference):

>>> import amara

>>> amara.__version__

'2.0.0a6'

>>> from amara.xslt import transform

>>> transform('<Root/>','xslt/index.xslt')

'<html xmlns="http://www.w3.org/1999/xhtml”> .. etc.. </html>’

Of course, I haven’t reinstalled or upgraded any of the various software packages (including Amara) since the application was deployed earlier this year, hence my printing of the version number to make sure I wasn’t comparing apples to oranges.

Notably, the server is running Python 2.6.6, while I”m running Python 2.7.5 locally.

Unfortunately, the traceback error is such that I don’t know where to begin troubleshooting (there are many xsl:if elements). Is there a place in the stack where I could add print statements that might help me identify where the problem is in the stylesheet?

Thanks in advance!

——————— %<----------------

>>> import amara

>>> amara.__version__

'2.0.0a6'

>>> from amara.xslt import transform

>>> transform('<Root/>','xslt/index.xslt')

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "/Library/Python/2.7/site-packages/amara/xslt/__init__.py", line 521, in transform

return proc.run(inputsource(source), params, result)

File "/Library/Python/2.7/site-packages/amara/xslt/processor.py", line 251, in run

return self._run(document, parameters, result)

File "/Library/Python/2.7/site-packages/amara/xslt/processor.py", line 547, in _run

self.transform.apply_templates(context, [node])

File "/Library/Python/2.7/site-packages/amara/xslt/tree/transform_element.py", line 666, in apply_templates

template.instantiate(context, params)

File "/Library/Python/2.7/site-packages/amara/xslt/tree/template_element.py", line 102, in instantiate

child.instantiate(context)

File "/Library/Python/2.7/site-packages/amara/xslt/tree/literal_element.py", line 67, in instantiate

self.process_children(context)

File "/Library/Python/2.7/site-packages/amara/xslt/tree/literal_element.py", line 67, in instantiate

self.process_children(context)

File "/Library/Python/2.7/site-packages/amara/xslt/tree/literal_element.py", line 67, in instantiate

self.process_children(context)

File "/Library/Python/2.7/site-packages/amara/xslt/tree/literal_element.py", line 67, in instantiate

self.process_children(context)

File "/Library/Python/2.7/site-packages/amara/xslt/tree/if_element.py", line 21, in instantiate

if self._test.evaluate_as_boolean(context):

File "/Library/Python/2.7/site-packages/amara/xpath/expressions/__init__.py", line 72, in evaluate_as_boolean

docstring=unicode(self))

File "/Library/Python/2.7/site-packages/amara/xpath/compiler/__init__.py", line 45, in compile

firstlineno)

File "/Library/Python/2.7/site-packages/amara/xpath/compiler/assembler.py", line 60, in assemble

stacksize = self._compute_stack_size()

File "/Library/Python/2.7/site-packages/amara/xpath/compiler/assembler.py", line 202, in _compute_stack_size

return walk(self.entry, 0, 0)

File "/Library/Python/2.7/site-packages/amara/xpath/compiler/assembler.py", line 192, in walk

maxsize = walk(instr.target, size, maxsize)

File "/Library/Python/2.7/site-packages/amara/xpath/compiler/assembler.py", line 198, in walk

maxsize = walk(block.next, size, maxsize)

File "/Library/Python/2.7/site-packages/amara/xpath/compiler/assembler.py", line 187, in walk

raise RuntimeError("unhandled instruction: %r" % instr)

RuntimeError: unhandled instruction: <instr at 0x1082cd9a8: opname='<block 1, offset 0>', oparg=None, target=None>

--
Chimezie Ogbuji
Sent with Airmail

index.xslt

Uche Ogbuji

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Aug 18, 2014, 12:34:30 AM8/18/14

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On Sun, Aug 17, 2014 at 7:56 PM, Chimezie Ogbuji <chim...@gmail.com> wrote:

Unfortunately, the traceback error is such that I don’t know where to begin troubleshooting (there are many xsl:if elements). Is there a place in the stack where I could add print statements that might help me identify where the problem is in the stylesheet?

Hmm. I guess the best bet I can think of is to add a try/except around this key bit:

https://github.com/zepheira/amara/blob/master/lib/xpath/expressions/__init__.py#L71

And in the exception handler print (str(self), repr(self)) to see the actual, problem XPath.

I know there are still rough edges left from Jeremy's redesign of Amara's XPath around Python's AST facilities, and unfortunately I have never had the time to dig into it all myself. For Amara3 my thoughts are to reimplement XPath by hand.

--

Uche Ogbuji http://uche.ogbuji.net
Founding Partner, Zepheira http://zepheira.com

Author, _Ndewo, Colorado_ http://uche.ogbuji.net/ndewo/
Founding editor, Kin Poetry Journal http://wearekin.org
http://copia.ogbuji.net http://www.linkedin.com/in/ucheogbuji http://twitter.com/uogbuji

Luis Miguel Morillas

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Aug 18, 2014, 5:42:44 PM8/18/14

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I reported similar error time ago [1] I had an issue with xpath rules
using *or* connectors such as:

u'//course[@year="2008" or @year="2010"]'

I'll try to test your example later.

[1] https://groups.google.com/forum/?hl=en&fromgroups=#!topic/akara-dev/Ksbou-n3lCY%5B1-25-false%5D

Best regards,

-- luismiguel (@lmorillas)

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