Use jinja2 templating engine for Python code generators

Source/core/scripts/template_expander.py

-#!/usr/bin/python
-#
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
 # in the documentation and/or other materials provided with the
 # distribution.
 #     * Neither the name of Google Inc. nor the names of its
 # contributors may be used to endorse or promote products derived from
 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-"""This file returns a list of all the IDL files that contain a partial interface."""
-
-import re
+import os.path
 import sys
 
-partial_interface_regex = re.compile(r'partial\s+interface\s+(\w+).+\]', re.M | re.S)
+def _setup():
+    autoinstallerpath = "../../../Tools/Scripts/webkitpy/common/system"

[abarth-chromium, 2013/05/06 18:27:32]

Woah, we shouldn't have a dependency across the world like this.

+    sys.path.insert(0, autoinstallerpath)
+    from autoinstall import AutoInstaller
+    installer = AutoInstaller() # This won't re-download if the file already exists
+    installer.install(url="https://pypi.python.org/packages/source/J/Jinja2/Jinja2-2.6.tar.gz#md5=1c49a8825c993bfdcf55bb36897d28a2", url_subpath="Jinja2-2.6/jinja2")

[abarth-chromium, 2013/05/06 18:27:32]

Can we just check jinja into third_party?  We don't want to autoinstall stuff
during compile.  That's what DEPS is for.

+    sys.path.insert(0, os.path.join(autoinstallerpath, "autoinstalled"))
 
-def DoMain(filenames):
-    partial_files = set()
-    for filename in filenames:
-        with open(filename) as f:
-            match = re.search(partial_interface_regex, f.read())
-            if match:
-                partial_files.add(filename)
-    return '\n'.join(partial_files)
+def applytemplate(pathtotemplate, params):
+    try:
+        import jinja2
+    except ImportError:
+        _setup()
+        import jinja2
+    dirname, basename = os.path.split(pathtotemplate)
+    env = jinja2.Environment(loader=jinja2.FileSystemLoader([dirname, "../scripts/templates"]))
+    template = env.get_template(basename)
+    return template.render(params)