58 lines
2.4 KiB
Python
58 lines
2.4 KiB
Python
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'''PX stands for *P*ython *X*ML. It is a templating engine that reuses the pod
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engine to produce XML (including XHTML) from templates written as a mix of
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Python and XML.'''
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# ------------------------------------------------------------------------------
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from UserDict import UserDict
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from px_parser import PxParser, PxEnvironment
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from appy.pod.renderer import BAD_CONTEXT
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# Exception class --------------------------------------------------------------
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class PxError(Exception): pass
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# ------------------------------------------------------------------------------
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class Px:
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'''Represents a (chunk of) PX code.'''
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def __init__(self, content, isFileName=False, partial=True):
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'''p_content is the PX code, as a string, or a file name if p_isFileName
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is True. If this code represents a complete XML file, p_partial is
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False. Else, we must surround p_content with a root tag to be able
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to parse it with a SAX parser.'''
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# Get the PX content
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if isFileName:
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f = file(content)
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self.content = f.read()
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f.close()
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else:
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self.content = content
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# It this content a complete XML file, or just some part of it?
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if partial:
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# Surround the partial chunk with a root tag: it must be valid XML.
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self.content = '<x>%s</x>' % self.content
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self.partial = partial
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# Create a PX parser
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self.parser = PxParser(PxEnvironment(), self)
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# Parses self.content (a PX code in a string) with self.parser, to
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# produce a tree of memory buffers.
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self.parser.parse(self.content)
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def __call__(self, context):
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# Get the context in a standardized form.
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evalContext = {}
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if hasattr(context, '__dict__'):
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evalContext.update(context.__dict__)
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elif isinstance(context, dict) or isinstance(context, UserDict):
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evalContext.update(context)
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else:
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raise PxError(BAD_CONTEXT)
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# Store the context on the PX environment
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self.parser.env.context = evalContext
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# Render the PX result and return it
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env = self.parser.env
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env.ast.evaluate()
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res = env.result.content
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# Clean the res, for the next evaluation
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env.result.clean()
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return res
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# ------------------------------------------------------------------------------
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