chrome/browser/resources/chromeos/chromevox/tools/jscompilerwrapper.py

   1 #!/usr/bin/env python
   2
   3 # Copyright 2014 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 '''Uses the closure compiler to check syntax and semantics of a js module
   8 with dependencies.'''
   9
  10 import os
  11 import re
  12 import subprocess
  13 import sys
  14
  15 _SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
  16 _CHROME_SOURCE_DIR = os.path.normpath(
  17     os.path.join(
  18         _SCRIPT_DIR, *[os.path.pardir] * 6))
  19
  20 # Compiler path.
  21 _CLOSURE_COMPILER_JAR = os.path.join(
  22     _CHROME_SOURCE_DIR, 'third_party', 'closure_compiler', 'compiler',
  23     'compiler.jar')
  24
  25 # List of compilation errors to enable with the --jscomp_errors flag.
  26 _JSCOMP_ERRORS = [ 'accessControls', 'checkTypes', 'checkVars', 'invalidCasts',
  27                    'missingProperties', 'undefinedNames', 'undefinedVars',
  28                    'visibility' ]
  29
  30 _java_executable = 'java'
  31
  32
  33 def _Error(msg):
  34   print >>sys.stderr, msg
  35   sys.exit(1)
  36
  37
  38 def _ExecuteCommand(args, ignore_exit_status=False):
  39   try:
  40     return subprocess.check_output(args, stderr=subprocess.STDOUT)
  41   except subprocess.CalledProcessError as e:
  42     if ignore_exit_status and e.returncode > 0:
  43       return e.output
  44     _Error('%s\nCommand \'%s\' returned non-zero exit status %d' %
  45            (e.output, ' '.join(e.cmd), e.returncode))
  46   except (OSError, IOError) as e:
  47     _Error('Error executing %s: %s' % (_java_executable, str(e)))
  48
  49
  50 def _CheckJava():
  51   global _java_executable
  52   java_home = os.environ.get('JAVAHOME')
  53   if java_home is not None:
  54     _java_executable = os.path.join(java_home, 'bin', 'java')
  55   output = _ExecuteCommand([_java_executable, '-version'])
  56   match = re.search(r'version "(?:\d+)\.(\d+)', output)
  57   if match is None or int(match.group(1)) < 7:
  58     _Error('Java 7 or later is required: \n%s' % output)
  59
  60 _CheckJava()
  61
  62
  63 def RunCompiler(js_files, externs=[]):
  64   args = [_java_executable, '-jar', _CLOSURE_COMPILER_JAR]
  65   args.extend(['--compilation_level', 'SIMPLE_OPTIMIZATIONS'])
  66   args.extend(['--jscomp_error=%s' % error for error in _JSCOMP_ERRORS])
  67   args.extend(['--language_in', 'ECMASCRIPT5'])
  68   args.extend(['--externs=%s' % extern for extern in externs])
  69   args.extend(['--js=%s' % js for js in js_files])
  70   args.extend(['--js_output_file', '/dev/null'])
  71   output = _ExecuteCommand(args, ignore_exit_status=True)
  72   success = len(output) == 0
  73   return success, output