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OpenStack Study: jinja_view.py**** CubicPower OpenStack Study ****
# Copyright 2013 Red Hat, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """Provides Jinja Views This module provides views that utilize the Jinja templating system for serialization. For more information on Jinja, please see http://jinja.pocoo.org/ . """ import jinja2
**** CubicPower OpenStack Study **** class JinjaView(object): """A Jinja View This view renders the given model using the provided Jinja template. The template can be given in various ways. If the `VIEw_TEXT` property is
**** CubicPower OpenStack Study **** def __init__(self, path=None, text=None): try: self._text = self.VIEW_TEXT except AttributeError: if path is not None: with open(path, 'r') as f: self._text = f.read() elif text is not None: self._text = text else: self._text = "" if self._text[0] == "\n": self._text = self._text[1:] newtext = self._text.lstrip() amt = len(self._text) - len(newtext) if (amt > 0): base_indent = self._text[0:amt] lines = self._text.splitlines() newlines = [] for line in lines: if line.startswith(base_indent): newlines.append(line[amt:]) else: newlines.append(line) self._text = "\n".join(newlines) if self._text[-1] == "\n": self._text = self._text[:-1] self._regentemplate = True self._templatecache = None
**** CubicPower OpenStack Study **** def __call__(self, model): return self.template.render(**model) @property
**** CubicPower OpenStack Study **** def template(self): """Get the Compiled Template Gets the compiled template, using a cached copy if possible (stored in attr:`_templatecache`) or otherwise recompiling the template if the compiled template is not present or is invalid (due to attr:`_regentemplate` being set to True). :returns: the compiled Jinja template :rtype: :class:`jinja2.Template` """ if self._templatecache is None or self._regentemplate: self._templatecache = jinja2.Template(self._text) self._regentemplate = False return self._templatecache
**** CubicPower OpenStack Study **** def _gettext(self): """Get the Template Text Gets the text of the current template :returns: the text of the Jinja template :rtype: str """ return self._text
**** CubicPower OpenStack Study **** def _settext(self, textval): """Set the Template Text Sets the text of the current template, marking it for recompilation next time the compiled template is retrived via attr:`template` . :param str textval: the new text of the Jinja template """ self._text = textval self.regentemplate = True text = property(_gettext, _settext)
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