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annotate piecrust/templating/pystacheengine.py @ 380:f33712c4cfab

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routing: Fix bugs with matching URLs with correct route but missing metadata. When matching a route like `/foo/%slug%` against an URL like `/foo`, the route will (correctly) return a match, but it will be completely missing the `slug` metadata, resulting in problems elsewhere. This change makes it so that any missing route metadata will be filled in with an empty string. And because this means generated URLs may differ from the incoming URL when using trailing slashes (`/foo/` _vs._ `/foo`), we make the assert in the chef server handle those discrepancies.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 May 2015 00:34:21 -0700
parents 139179dc7abd
children f4b7c8f183a4
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1 import logging
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2 import pystache
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3 from piecrust.templating.base import (
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4 TemplateEngine, TemplateNotFoundError, TemplatingError)
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5
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class PystacheTemplateEngine(TemplateEngine):
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11 ENGINE_NAMES = ['mustache']
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12 EXTENSIONS = ['mustache']
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13
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14 def __init__(self):
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15 self.renderer = None
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16
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17 def renderString(self, txt, data, filename=None):
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18 self._ensureLoaded()
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19 try:
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20 return self.renderer.render(txt, data)
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21 except pystache.TemplateNotFoundError as ex:
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22 raise TemplateNotFoundError() from ex
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23 except pystache.PystacheError as ex:
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24 raise TemplatingError(str(ex), filename) from ex
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25
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26 def renderFile(self, paths, data):
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27 self._ensureLoaded()
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28 tpl = None
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29 logger.debug("Looking for template: %s" % paths)
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30 for p in paths:
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31 if not p.endswith('.mustache'):
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32 raise TemplatingError(
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33 "The Mustache template engine only accepts template "
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34 "filenames with a `.mustache` extension. Got: %s" %
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35 p)
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36 name = p[:-9] # strip `.mustache`
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37 try:
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38 tpl = self.renderer.load_template(name)
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39 except Exception as ex:
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40 print(p, ex)
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41 pass
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42
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43 if tpl is None:
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44 raise TemplateNotFoundError()
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45
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46 try:
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47 return self.renderer.render(tpl, data)
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48 except pystache.PystacheError as ex:
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49 raise TemplatingError(str(ex)) from ex
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50
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51 def _ensureLoaded(self):
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52 if self.renderer:
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53 return
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54
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55 self.renderer = pystache.Renderer(
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56 search_dirs=self.app.templates_dirs)
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57