build-app.py

#!/usr/bin/python
# Compresses the files for one game into a single JavaScript file.
#
# Copyright 2013 Google Inc.
# https://github.com/google/blockly-games
#
# 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.

# This script generates two files:
#   compressed.js
#   uncompressed.js
# The compressed file is a concatenation of all the relevant JavaScript which
# has been run through Google's Closure Compiler.
# The uncompressed file is a script that loads in each JavaScript file
# one by one.  This takes much longer for a browser to load, but is useful
# when debugging code since line numbers are meaningful and variables haven't
# been renamed.  The uncompressed file also allows for a faster development
# cycle since there is no need to rebuild or recompile, just reload.

import json
import os.path
import re
import subprocess
import sys

# Define a warning message for all the generated files.
WARNING = '// Automatically generated file.  Do not edit!\n'


def main(name, lang):
  if lang != None:
    language(name, lang)
  else:
    # Extract the list of supported languages from boot.js.
    # This is a bit fragile.
    boot = open('appengine/common/boot.js', 'r')
    js = ' '.join(boot.readlines())
    boot.close()
    m = re.search('\[\'BlocklyGamesLanguages\'\] = (\[[-,\'\\s\\w]+\])', js)
    if not m:
      print("Can't find BlocklyGamesLanguages in boot.js")
      raise
    langs = m.group(1)
    langs = langs.replace("'", '"')
    langs = json.loads(langs)
    for lang in langs:
      language(name, lang)


def language(name, lang):
  if os.path.exists('appengine/third-party/blockly/msg/js/%s.js' % lang):
    # Convert 'pt-br' to 'pt.br'.
    core_language = 'Blockly.Msg.' + lang.replace('-', '.')
  else:
    core_language = 'Blockly.Msg.en'
  f = open('appengine/%s/generated/%s/msg.js' % (name, lang), 'w')
  f.write(WARNING)
  f.write("goog.provide('BlocklyGames.Msg');\n")
  f.write("goog.require('%s');\n" % core_language)
  f.close()
  write_uncompressed(name, lang)
  write_compressed(name, lang)


def write_uncompressed(name, lang):
  print('\n%s - %s - uncompressed:' % (name.title(), lang))
  cmd = ['third-party/build/closurebuilder.py',
      '--root=appengine/third-party/',
      '--root=appengine/generated/%s/' % lang,
      '--root=appengine/js/',
      '--namespace=%s' % name.replace('/', '.').title(),
      '--output_mode=list']
  directory = name
  while directory:
    cmd.append('--root=appengine/%s/generated/%s/' % (directory, lang))
    cmd.append('--root=appengine/%s/js/' % directory)
    (directory, sep, fragment) = directory.rpartition(os.path.sep)
  try:
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  except:
    print("Failed to Popen: %s" % cmd)
    raise
  files = readStdout(proc)

  if name == 'pond/docs':
    path = '../'
  else:
    path = ''
  prefix = 'appengine/'
  srcs = []
  for file in files:
    file = file.strip()
    if file[:len(prefix)] == prefix:
      file = file[len(prefix):]
    else:
      raise(Exception('"%s" is not in "%s".' % (file, prefix)))
    srcs.append('"%s%s"' % (path, file))
  f = open('appengine/%s/generated/%s/uncompressed.js' % (name, lang), 'w')
  f.write("""%s
(function() {
  var srcs = [
      %s
  ];
  function loadScript() {
    var src = srcs.shift();
    if (src) {
      var script = document.createElement('script');
      script.src = src;
      script.type = 'text/javascript';
      script.onload = loadScript;
      document.head.appendChild(script);
    }
  }
  loadScript();
})();
""" % (WARNING, ',\n      '.join(srcs)))
  f.close()
  print('Found %d dependencies.' % len(srcs))


def trim_licence(code):
  """Strip out Google's and MIT's Apache licences.

  JS Compiler preserves dozens of Apache licences in the Blockly code.
  Remove these if they belong to Google or MIT.
  MIT's permission to do this is logged in Blockly issue 2412.

  Args:
    code: Large blob of compiled source code.

  Returns:
    Code with Google's and MIT's Apache licences trimmed.
  """
  apache2 = re.compile("""/\\*

 [\\w: ]+

 (Copyright \\d+ (Google Inc.|Massachusetts Institute of Technology))
 (https://developers.google.com/blockly/|All rights reserved.)

 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.
\\*/""")
  return re.sub(apache2, '', code)


def write_compressed(name, lang):
  print('\n%s - %s - compressed:' % (name.title(), lang))

  cmd = [
    'java',
    '-jar', 'third-party/closure-compiler.jar',
    '--generate_exports',
    '--compilation_level', 'ADVANCED_OPTIMIZATIONS',
    '--dependency_mode=STRICT',
    '--externs', 'externs/gviz-externs.js',
    '--externs', 'externs/interpreter-externs.js',
    '--externs', 'externs/prettify-externs.js',
    '--externs', 'externs/soundJS-externs.js',
    '--externs', 'externs/storage-externs.js',
    '--externs', 'appengine/third-party/blockly/externs/svg-externs.js',
    '--language_out', 'ECMASCRIPT5_STRICT',
    '--entry_point=%s' % name.replace('/', '.').title(),
    "--js='appengine/third-party/**.js'",
    "--js='!appengine/third-party/blockly/*.js'",
    "--js='!appengine/third-party/blockly/tests/**.js'",
    "--js='!appengine/third-party/blockly/externs/**.js'",
    "--js='!appengine/third-party/blockly/demos/**.js'",
    "--js='appengine/generated/%s/*.js'" % lang,
    "--js='appengine/js/*.js'",
    '--warning_level', 'QUIET',
  ]
  directory = name
  while directory:
    cmd.append("--js='appengine/%s/generated/%s/*.js'" % (directory, lang))
    cmd.append("--js='appengine/%s/js/*.js'" % directory)
    (directory, sep, fragment) = directory.rpartition(os.path.sep)
  try:
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  except:
    print("Failed to Popen: %s" % cmd)
    raise
  script = readStdout(proc)
  script = ''.join(script)
  script = trim_licence(script)
  print('Compressed to %d KB.' % (len(script) / 1024))

  f = open('appengine/%s/generated/%s/compressed.js' % (name, lang), 'w')
  f.write(WARNING)
  f.write(script)
  f.close()


def readStdout(proc):
  data = proc.stdout.readlines()
  # Python 2 reads stdout as text.
  # Python 3 reads stdout as bytes.
  return list(map(lambda line:
      type(line) == str and line or str(line, 'utf-8'), data))


if __name__ == '__main__':
  if len(sys.argv) == 2:
    main(sys.argv[1], None)
  elif len(sys.argv) == 3:
    main(sys.argv[1], sys.argv[2])
  else:
    print('Format: %s <appname> [<language>]' % sys.argv[0])
    sys.exit(2)