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Viewing changes to src/mako/ext/autohandler.py

  • Committer: Matthew Nuzum
  • Date: 2008-04-18 01:58:53 UTC
  • Revision ID: matthew.nuzum@canonical.com-20080418015853-2b8rf979z2c2exxl
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src/mako/ext/autohandler.py
 
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"""adds autohandler functionality to Mako templates.
 
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requires that the TemplateLookup class is used with templates.
 
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usage:
 
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<%!
 
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        from mako.ext.autohandler import autohandler
 
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%>
 
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<%inherit file="${autohandler(template, context)}"/>
 
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or with custom autohandler filename:
 
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<%!
 
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        from mako.ext.autohandler import autohandler
 
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%>
 
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<%inherit file="${autohandler(template, context, name='somefilename')}"/>
 
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"""
 
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import posixpath, os, re
 
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def autohandler(template, context, name='autohandler'):
 
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    lookup = context.lookup
 
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    _template_uri = template.module._template_uri
 
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    if not lookup.filesystem_checks:
 
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        try:
 
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            return lookup._uri_cache[(autohandler, _template_uri, name)]
 
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        except KeyError:
 
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            pass
 
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    tokens = re.findall(r'([^/]+)', posixpath.dirname(_template_uri)) + [name]
 
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    while len(tokens):
 
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        path = '/' + '/'.join(tokens)
 
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        if path != _template_uri and _file_exists(lookup, path):
 
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            if not lookup.filesystem_checks:
 
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                return lookup._uri_cache.setdefault((autohandler, _template_uri, name), path)
 
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            else:
 
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                return path
 
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        if len(tokens) == 1:
 
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            break
 
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        tokens[-2:] = [name]
 
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    if not lookup.filesystem_checks:
 
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        return lookup._uri_cache.setdefault((autohandler, _template_uri, name), None)
 
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    else:
 
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        return None
 
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def _file_exists(lookup, path):
 
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    psub = re.sub(r'^/', '',path)
 
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    for d in lookup.directories:
 
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        if os.access(d + '/' + psub, os.F_OK):
 
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            return True
 
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    else:
 
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        return False
 
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b'\\ No newline at end of file'