author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 21 Feb 2009 00:33:59 +0000 | |
changeset 1416 | 6c94a1531ead |
parent 686 | df109be0567c |
permissions | -rwxr-xr-x |
109
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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|
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"""A simple wrapper for Django templates. |
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|
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The main purpose of this module is to hide all of the package import pain |
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you normally have to go through to get Django to work. We expose the Django |
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Template and Context classes from this module, handling the import nonsense |
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on behalf of clients. |
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|
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Typical usage: |
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|
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from google.appengine.ext.webapp import template |
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print template.render('templates/index.html', {'foo': 'bar'}) |
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|
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Django uses a global setting for the directory in which it looks for templates. |
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This is not natural in the context of the webapp module, so our load method |
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takes in a complete template path, and we set these settings on the fly |
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automatically. Because we have to set and use a global setting on every |
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method call, this module is not thread safe, though that is not an issue |
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for applications. |
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|
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Django template documentation is available at: |
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http://www.djangoproject.com/documentation/templates/ |
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""" |
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import md5 |
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import os |
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|
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try: |
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from django import v0_96 |
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except ImportError: |
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pass |
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import django |
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import django.conf |
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try: |
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django.conf.settings.configure( |
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DEBUG=False, |
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TEMPLATE_DEBUG=False, |
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TEMPLATE_LOADERS=( |
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'django.template.loaders.filesystem.load_template_source', |
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), |
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) |
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except (EnvironmentError, RuntimeError): |
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pass |
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import django.template |
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import django.template.loader |
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|
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from google.appengine.ext import webapp |
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def render(template_path, template_dict, debug=False): |
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"""Renders the template at the given path with the given dict of values. |
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|
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Example usage: |
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render("templates/index.html", {"name": "Bret", "values": [1, 2, 3]}) |
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|
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Args: |
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template_path: path to a Django template |
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template_dict: dictionary of values to apply to the template |
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""" |
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t = load(template_path, debug) |
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return t.render(Context(template_dict)) |
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|
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|
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template_cache = {} |
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def load(path, debug=False): |
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"""Loads the Django template from the given path. |
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|
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It is better to use this function than to construct a Template using the |
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class below because Django requires you to load the template with a method |
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if you want imports and extends to work in the template. |
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""" |
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abspath = os.path.abspath(path) |
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|
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if not debug: |
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template = template_cache.get(abspath, None) |
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else: |
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template = None |
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|
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if not template: |
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directory, file_name = os.path.split(abspath) |
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new_settings = { |
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'TEMPLATE_DIRS': (directory,), |
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'TEMPLATE_DEBUG': debug, |
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'DEBUG': debug, |
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} |
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old_settings = _swap_settings(new_settings) |
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try: |
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template = django.template.loader.get_template(file_name) |
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finally: |
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_swap_settings(old_settings) |
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|
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if not debug: |
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113 |
template_cache[abspath] = template |
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|
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115 |
def wrap_render(context, orig_render=template.render): |
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116 |
URLNode = django.template.defaulttags.URLNode |
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save_urlnode_render = URLNode.render |
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old_settings = _swap_settings(new_settings) |
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119 |
try: |
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URLNode.render = _urlnode_render_replacement |
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121 |
return orig_render(context) |
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122 |
finally: |
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123 |
_swap_settings(old_settings) |
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124 |
URLNode.render = save_urlnode_render |
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125 |
|
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126 |
template.render = wrap_render |
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127 |
|
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128 |
return template |
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129 |
|
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130 |
|
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131 |
def _swap_settings(new): |
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"""Swap in selected Django settings, returning old settings. |
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133 |
|
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134 |
Example: |
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save = _swap_settings({'X': 1, 'Y': 2}) |
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136 |
try: |
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...new settings for X and Y are in effect here... |
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138 |
finally: |
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139 |
_swap_settings(save) |
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140 |
|
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141 |
Args: |
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142 |
new: A dict containing settings to change; the keys should |
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143 |
be setting names and the values settings values. |
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144 |
|
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145 |
Returns: |
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146 |
Another dict structured the same was as the argument containing |
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147 |
the original settings. Original settings that were not set at all |
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148 |
are returned as None, and will be restored as None by the |
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149 |
'finally' clause in the example above. This shouldn't matter; we |
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150 |
can't delete settings that are given as None, since None is also a |
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151 |
legitimate value for some settings. Creating a separate flag value |
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152 |
for 'unset' settings seems overkill as there is no known use case. |
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153 |
""" |
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154 |
settings = django.conf.settings |
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155 |
old = {} |
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156 |
for key, value in new.iteritems(): |
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old[key] = getattr(settings, key, None) |
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158 |
setattr(settings, key, value) |
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159 |
return old |
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160 |
|
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161 |
|
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162 |
def create_template_register(): |
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"""Used to extend the Django template library with custom filters and tags. |
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164 |
|
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165 |
To extend the template library with a custom filter module, create a Python |
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166 |
module, and create a module-level variable named "register", and register |
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167 |
all custom filters to it as described at |
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168 |
http://www.djangoproject.com/documentation/templates_python/ |
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169 |
#extending-the-template-system: |
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170 |
|
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171 |
templatefilters.py |
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172 |
================== |
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173 |
register = webapp.template.create_template_register() |
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174 |
|
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175 |
def cut(value, arg): |
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176 |
return value.replace(arg, '') |
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177 |
register.filter(cut) |
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178 |
|
686
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179 |
Then, register the custom template module with the register_template_library |
109
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180 |
function below in your application module: |
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181 |
|
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182 |
myapp.py |
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183 |
======== |
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184 |
webapp.template.register_template_library('templatefilters') |
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185 |
""" |
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186 |
return django.template.Library() |
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187 |
|
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188 |
|
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189 |
def register_template_library(package_name): |
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190 |
"""Registers a template extension module to make it usable in templates. |
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191 |
|
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192 |
See the documentation for create_template_register for more information.""" |
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193 |
if not django.template.libraries.get(package_name, None): |
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194 |
django.template.add_to_builtins(package_name) |
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195 |
|
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196 |
|
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197 |
Template = django.template.Template |
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198 |
Context = django.template.Context |
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199 |
|
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200 |
|
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201 |
def _urlnode_render_replacement(self, context): |
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202 |
"""Replacement for django's {% url %} block. |
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203 |
|
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204 |
This version uses WSGIApplication's url mapping to create urls. |
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205 |
|
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206 |
Examples: |
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207 |
|
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208 |
<a href="{% url MyPageHandler "overview" %}"> |
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209 |
{% url MyPageHandler implicit_args=False %} |
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210 |
{% url MyPageHandler "calendar" %} |
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211 |
{% url MyPageHandler "jsmith","calendar" %} |
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212 |
""" |
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213 |
args = [arg.resolve(context) for arg in self.args] |
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214 |
try: |
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|
215 |
app = webapp.WSGIApplication.active_instance |
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216 |
handler = app.get_registered_handler_by_name(self.view_name) |
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217 |
return handler.get_url(implicit_args=True, *args) |
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218 |
except webapp.NoUrlFoundError: |
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219 |
return '' |