WebUI: Add GN rules for Vulcanize.

chrome/browser/resources/vulcanize_gn.py

+#!/usr/bin/env python
+# Copyright 2016 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.
+
+import argparse
+import itertools
+import os
+import re
+import subprocess
+import sys
+import tempfile
+from functools import partial
+
+_HERE_PATH = os.path.join(os.path.dirname(__file__))
+_SRC_PATH = os.path.normpath(os.path.join(_HERE_PATH, '..', '..', '..'))
+
+sys.path.append(os.path.join(_SRC_PATH, 'third_party', 'node'))
+import node
+import node_modules
+
+_NODE_BINARY = node.get_binary()
+
+_RESOURCES_PATH = os.path.join(_SRC_PATH, 'ui', 'webui', 'resources')
+
+_CR_ELEMENTS_PATH = os.path.join(_RESOURCES_PATH, 'cr_elements')
+_CSS_RESOURCES_PATH = os.path.join(_RESOURCES_PATH, 'css')
+_HTML_RESOURCES_PATH = os.path.join(_RESOURCES_PATH, 'html')
+_JS_RESOURCES_PATH = os.path.join(_RESOURCES_PATH, 'js')
+_POLYMER_PATH = os.path.join(
+    _SRC_PATH, 'third_party', 'polymer', 'v1_0', 'components-chromium')
+
+_VULCANIZE_BASE_ARGS = [
+  '--exclude', 'crisper.js',
+
+  # These files are already combined and minified.
+  '--exclude', 'chrome://resources/html/polymer.html',
+  '--exclude', 'web-animations-next-lite.min.js',
+
+  # These files are dynamically created by C++.
+  '--exclude', 'load_time_data.js',
+  '--exclude', 'strings.js',
+  '--exclude', 'text_defaults.css',
+  '--exclude', 'text_defaults_md.css',
+
+  '--inline-css',
+  '--inline-scripts',
+  '--strip-comments',
+]
+
+_URL_MAPPINGS = [
+    ('chrome://resources/cr_elements/', _CR_ELEMENTS_PATH),
+    ('chrome://resources/css/', _CSS_RESOURCES_PATH),
+    ('chrome://resources/html/', _HTML_RESOURCES_PATH),
+    ('chrome://resources/js/', _JS_RESOURCES_PATH),
+    ('chrome://resources/polymer/v1_0/', _POLYMER_PATH)
+]
+
+_VULCANIZE_REDIRECT_ARGS = list(itertools.chain.from_iterable(map(

[Dan Beam, 2017/01/20 00:56:50]

what's goin on here?  why can't this just be

['--redirect|%s' % m for m in _URL_MAPPINGS]

?

[dpapad, 2017/01/20 18:35:04]

Need to generate an array that looks as follows
[
  '--redirect', 'chrome://a/b|../c/d',
  '--redirect', 'chrome://c/d|../e/f',
]
but your suggestion 
['--redirect '%s|%s' % (u,p) for (u, p) in _URL_MAPPINGS]

generates a different array that looks as follows

[
  '--redirect chrome://a/b|../c/d',
  '--redirect chrome://c/d|../e/f',
]

The problem is that the '--redirect' part and the remaining part need to be
separate elements of the returned array, otherwise the run_cmd call at line 115
is treating "--redirect foo" as a single argument.

+    lambda m: ['--redirect', m[0] + '|%s' % m[1]], _URL_MAPPINGS)))
+
+def _run_cmd(cmd_parts, stdout=None):
+  cmd = "'" + "' '".join(cmd_parts) + "'"
+  process = subprocess.Popen(
+      cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+  stdout, stderr = process.communicate()
+
+  if stderr:
+    print >> sys.stderr, '%s failed: %s' % (cmd, stderr)
+    raise
+
+  return stdout
+
+def _undo_mapping(mappings, url):
+  for tup in mappings:
+    res = re.match(tup[0], url)
+    if res:
+      return url.replace(tup[0], tup[1] + '/');
+  return url
+
+# Get a list of all files that were bundled with Vulcanize and update the
+# depfile accordingly such that Ninja knows when to trigger re-vulcanization.
+def _update_dep_file(in_folder, out_folder, host, depfile, html_out_file):
+  in_path = os.path.join(os.getcwd(), in_folder)
+  out_path = os.path.join(os.getcwd(), out_folder)
+
+  # Prior call to vulcanize already generated the deps list, grab it from there.
+  request_list = open(os.path.join(
+      out_path, 'request_list.txt'), 'r').read().splitlines()
+
+  # Undo the URL mappings applied by vulcanize to get file paths relative to
+  # current working directory.
+  url_mappings = [
+      ('/', os.path.relpath(in_path, os.getcwd())),
+      ('chrome://%s/' % host, os.path.relpath(in_path, os.getcwd())),
+  ]
+  dependencies = map(partial(

[Dan Beam, 2017/01/20 00:56:50]

can you just use lambda instead?

[dpapad, 2017/01/20 18:35:04]

Done.

+      _undo_mapping, _URL_MAPPINGS + url_mappings), request_list)
+
+  f = open(os.path.join(os.getcwd(), depfile), 'w')
+  f.write(os.path.join(
+      out_folder, html_out_file + ': ') + ' '.join(dependencies))
+  f.close()
+
+def _vulcanize(in_folder, out_folder, host, html_in_file,
+               html_out_file, js_out_file):
+  in_path = os.path.join(os.getcwd(), in_folder)
+  out_path = os.path.join(os.getcwd(), out_folder)
+
+  html_out_path = os.path.join(out_path, html_out_file)
+  js_out_path = os.path.join(out_path, js_out_file)
+
+  output = _run_cmd(
+      [_NODE_BINARY, node_modules.get_vulcanize_binary()] +
+      _VULCANIZE_BASE_ARGS + _VULCANIZE_REDIRECT_ARGS +
+      ['--out-request-list', os.path.join(out_path, 'request_list.txt'),
+       '--redirect', '/|%s' % in_path,
+       '--redirect', 'chrome://%s/|%s' % (host, in_path),
+       os.path.join('/', html_in_file)])
+
+  with tempfile.NamedTemporaryFile(mode='wt+', delete=False) as tmp:
+    # Grit includes are not supported, use HTML imports instead.
+    tmp.write(output.replace(
+        '<include src="', '<include src-disabled="'))
+
+  try:
+    _run_cmd([_NODE_BINARY, node_modules.get_crisper_binary(),
+             '--source', tmp.name,
+             '--script-in-head', 'false',
+             '--html', html_out_path,
+             '--js', js_out_path])
+
+    # TODO(tsergeant): Remove when JS resources are minified by default:
+    # crbug.com/619091.
+    _run_cmd([_NODE_BINARY, node_modules.get_uglifyjs_binary(), js_out_path,
+              '--comments', '/Copyright|license|LICENSE|\<\/?if/',
+              '--output', js_out_path])
+  finally:
+    os.remove(tmp.name)
+
+def _css_build(out_folder, files):
+  out_path = os.path.join(os.getcwd(), out_folder)
+  paths = map(lambda f: os.path.join(out_path, f), files)
+
+  _run_cmd([_NODE_BINARY, node_modules.get_polymer_css_build_binary()] + paths)
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--host')
+  parser.add_argument('--htmlInFile')
+  parser.add_argument('--htmlOutFile')
+  parser.add_argument('--inputType')
+  parser.add_argument('--input')
+  parser.add_argument('--jsOutFile')
+  parser.add_argument('--outFolder')
+  parser.add_argument('--depfile')
+  args = parser.parse_args()
+
+  vulcanize_input_folder = args.input;
+
+  # If a .pak file was specified, unpack that file first and pass the output to
+  # vulcanize.
+  if (args.inputType == 'PAK_FILE'):
+    import unpack_pak
+    input_folder = os.path.join(os.getcwd(), args.input)
+    output_folder = os.path.join(args.outFolder, 'flattened');
+    unpack_pak.unpack(args.input, output_folder)
+    vulcanize_input_folder = output_folder
+  # assert inputType == "FOLDER"

[Dan Beam, 2017/01/20 00:56:50]

remove

[dpapad, 2017/01/20 18:35:05]

Done.

+
+  _vulcanize(vulcanize_input_folder, args.outFolder, args.host, args.htmlInFile,
+             args.htmlOutFile, args.jsOutFile);
+  _css_build(args.outFolder, files=[args.htmlOutFile])
+
+  _update_dep_file(vulcanize_input_folder, args.outFolder, args.host,
+                   args.depfile, args.htmlOutFile)
+
+if __name__ == '__main__':
+  main()