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annotate roundup/cgi/engine_zopetal.py @ 5179:e8b3d3a14563

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- issue2550796: Calendar and Classhelp selection tools don't cause onchange event to be triggered. Using the helper popups for modifying lists of users, lists of issues, dates etc.. now trigger the change event on the form's field. This allows onchange javascript to trigger to highlight changes, recalculate other form values etc. See ``upgrading.txt`` for details on applying these changes to your tracker.
author John Rouillard <rouilj@ieee.org>
date Sat, 28 Jan 2017 20:58:19 -0500
parents 0421390b3094
children 198b6e810c67
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1 """Templating engine adapter for the legacy TAL implementation ported from
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2 Zope.
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3 """
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4 __docformat__ = 'restructuredtext'
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5
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6 import errno
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7 import mimetypes
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8 import os
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9 import os.path
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10
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11 from roundup.cgi.templating import StringIO, context, translationService, TALLoaderBase
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12 from roundup.cgi.PageTemplates import PageTemplate, GlobalTranslationService
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13 from roundup.cgi.PageTemplates.Expressions import getEngine
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14 from roundup.cgi.TAL import TALInterpreter
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15
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16 GlobalTranslationService.setGlobalTranslationService(translationService)
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17
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18 class Loader(TALLoaderBase):
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19 templates = {}
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20
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21 def __init__(self, dir):
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22 self.dir = dir
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23
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24 def load(self, tplname):
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25 # find the source
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26 src, filename = self._find(tplname)
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27
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28 # has it changed?
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29 try:
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30 stime = os.stat(src)[os.path.stat.ST_MTIME]
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31 except os.error, error:
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32 if error.errno != errno.ENOENT:
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33 raise
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34
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35 if self.templates.has_key(src) and \
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36 stime <= self.templates[src].mtime:
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37 # compiled template is up to date
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38 return self.templates[src]
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39
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40 # compile the template
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41 pt = RoundupPageTemplate()
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42 # use pt_edit so we can pass the content_type guess too
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43 content_type = mimetypes.guess_type(filename)[0] or 'text/html'
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44 pt.pt_edit(open(src).read(), content_type)
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45 pt.id = filename
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46 pt.mtime = stime
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47 # Add it to the cache. We cannot do this until the template
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48 # is fully initialized, as we could otherwise have a race
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49 # condition when running with multiple threads:
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50 #
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51 # 1. Thread A notices the template is not in the cache,
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52 # adds it, but has not yet set "mtime".
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53 #
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54 # 2. Thread B notices the template is in the cache, checks
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55 # "mtime" (above) and crashes.
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56 #
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57 # Since Python dictionary access is atomic, as long as we
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58 # insert "pt" only after it is fully initialized, we avoid
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59 # this race condition. It's possible that two separate
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60 # threads will both do the work of initializing the template,
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61 # but the risk of wasted work is offset by avoiding a lock.
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62 self.templates[src] = pt
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63 return pt
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64
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65 class RoundupPageTemplate(PageTemplate.PageTemplate):
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66 """A Roundup-specific PageTemplate.
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67
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68 Interrogate the client to set up Roundup-specific template variables
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69 to be available. See 'context' function for the list of variables.
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70
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71 """
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72
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73 def render(self, client, classname, request, **options):
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74 """Render this Page Template"""
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75
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76 if not self._v_cooked:
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77 self._cook()
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78
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79 __traceback_supplement__ = (PageTemplate.PageTemplateTracebackSupplement, self)
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80
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81 if self._v_errors:
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82 raise PageTemplate.PTRuntimeError, \
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83 'Page Template %s has errors.'%self.id
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84
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85 # figure the context
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86 c = context(client, self, classname, request)
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87 c.update({'options': options})
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88
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89 # and go
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90 output = StringIO.StringIO()
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91 TALInterpreter.TALInterpreter(self._v_program, self.macros,
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92 getEngine().getContext(c), output, tal=1, strictinsert=0)()
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93 return output.getvalue()
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94
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