Add a snapshot of flutter/engine/src/build to our sdk

build/android/gyp/jinja_template.py

+#!/usr/bin/env python
+#
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Renders one or more template files using the Jinja template engine."""
+
+import codecs
+import optparse
+import os
+import sys
+
+from util import build_utils
+
+# Import jinja2 from third_party/jinja2
+sys.path.append(os.path.join(os.path.dirname(__file__), '../../../third_party'))
+import jinja2  # pylint: disable=F0401
+
+
+class RecordingFileSystemLoader(jinja2.FileSystemLoader):
+  '''A FileSystemLoader that stores a list of loaded templates.'''
+  def __init__(self, searchpath):
+    jinja2.FileSystemLoader.__init__(self, searchpath)
+    self.loaded_templates = set()
+
+  def get_source(self, environment, template):
+    contents, filename, uptodate = jinja2.FileSystemLoader.get_source(
+        self, environment, template)
+    self.loaded_templates.add(os.path.relpath(filename))
+    return contents, filename, uptodate
+
+  def get_loaded_templates(self):
+    return list(self.loaded_templates)
+
+
+def ProcessFile(env, input_filename, loader_base_dir, output_filename,
+                variables):
+  input_rel_path = os.path.relpath(input_filename, loader_base_dir)
+  template = env.get_template(input_rel_path)
+  output = template.render(variables)
+  with codecs.open(output_filename, 'w', 'utf-8') as output_file:
+    output_file.write(output)
+
+
+def ProcessFiles(env, input_filenames, loader_base_dir, inputs_base_dir,
+                 outputs_zip, variables):
+  with build_utils.TempDir() as temp_dir:
+    for input_filename in input_filenames:
+      relpath = os.path.relpath(os.path.abspath(input_filename),
+                                os.path.abspath(inputs_base_dir))
+      if relpath.startswith(os.pardir):
+        raise Exception('input file %s is not contained in inputs base dir %s'
+                        % (input_filename, inputs_base_dir))
+
+      output_filename = os.path.join(temp_dir, relpath)
+      parent_dir = os.path.dirname(output_filename)
+      build_utils.MakeDirectory(parent_dir)
+      ProcessFile(env, input_filename, loader_base_dir, output_filename,
+                  variables)
+
+    build_utils.ZipDir(outputs_zip, temp_dir)
+
+
+def main():
+  parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+  parser.add_option('--inputs', help='The template files to process.')
+  parser.add_option('--output', help='The output file to generate. Valid '
+                    'only if there is a single input.')
+  parser.add_option('--outputs-zip', help='A zip file containing the processed '
+                    'templates. Required if there are multiple inputs.')
+  parser.add_option('--inputs-base-dir', help='A common ancestor directory of '
+                    'the inputs. Each output\'s path in the output zip will '
+                    'match the relative path from INPUTS_BASE_DIR to the '
+                    'input. Required if --output-zip is given.')
+  parser.add_option('--loader-base-dir', help='Base path used by the template '
+                    'loader. Must be a common ancestor directory of '
+                    'the inputs. Defaults to CHROMIUM_SRC.',
+                    default=build_utils.CHROMIUM_SRC)
+  parser.add_option('--variables', help='Variables to be made available in the '
+                    'template processing environment, as a GYP list (e.g. '
+                    '--variables "channel=beta mstone=39")', default='')
+  options, args = parser.parse_args()
+
+  build_utils.CheckOptions(options, parser, required=['inputs'])
+  inputs = build_utils.ParseGypList(options.inputs)
+
+  if (options.output is None) == (options.outputs_zip is None):
+    parser.error('Exactly one of --output and --output-zip must be given')
+  if options.output and len(inputs) != 1:
+    parser.error('--output cannot be used with multiple inputs')
+  if options.outputs_zip and not options.inputs_base_dir:
+    parser.error('--inputs-base-dir must be given when --output-zip is used')
+  if args:
+    parser.error('No positional arguments should be given.')
+
+  variables = {}
+  for v in build_utils.ParseGypList(options.variables):
+    if '=' not in v:
+      parser.error('--variables argument must contain "=": ' + v)
+    name, _, value = v.partition('=')
+    variables[name] = value
+
+  loader = RecordingFileSystemLoader(options.loader_base_dir)
+  env = jinja2.Environment(loader=loader, undefined=jinja2.StrictUndefined,
+                           line_comment_prefix='##')
+  if options.output:
+    ProcessFile(env, inputs[0], options.loader_base_dir, options.output,
+                variables)
+  else:
+    ProcessFiles(env, inputs, options.loader_base_dir, options.inputs_base_dir,
+                 options.outputs_zip, variables)
+
+  if options.depfile:
+    deps = loader.get_loaded_templates() + build_utils.GetPythonDependencies()
+    build_utils.WriteDepfile(options.depfile, deps)
+
+
+if __name__ == '__main__':
+  main()