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#!/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.
'''Uses the closure compiler to check syntax and semantics of a js module
with dependencies.'''
import os
import re
import subprocess
import sys
_SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
_CHROME_SOURCE_DIR = os.path.normpath(
os.path.join(
_SCRIPT_DIR, *[os.path.pardir] * 6))
# Compiler path.
_CLOSURE_COMPILER_JAR = os.path.join(
_CHROME_SOURCE_DIR, 'third_party', 'closure_compiler', 'compiler',
'compiler.jar')
# List of compilation errors to enable with the --jscomp_errors flag.
_JSCOMP_ERRORS = [ 'accessControls', 'checkTypes', 'checkVars', 'invalidCasts',
'missingProperties', 'undefinedNames', 'undefinedVars',
'visibility' ]
_java_executable = 'java'
def _Error(msg):
print >>sys.stderr, msg
sys.exit(1)
def _ExecuteCommand(args, ignore_exit_status=False):
try:
return subprocess.check_output(args, stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
if ignore_exit_status and e.returncode > 0:
return e.output
_Error('%s\nCommand \'%s\' returned non-zero exit status %d' %
(e.output, ' '.join(e.cmd), e.returncode))
except (OSError, IOError) as e:
_Error('Error executing %s: %s' % (_java_executable, str(e)))
def _CheckJava():
global _java_executable
java_home = os.environ.get('JAVAHOME')
if java_home is not None:
_java_executable = os.path.join(java_home, 'bin', 'java')
output = _ExecuteCommand([_java_executable, '-version'])
match = re.search(r'version "(?:\d+)\.(\d+)', output)
if match is None or int(match.group(1)) < 7:
_Error('Java 7 or later is required: \n%s' % output)
_CheckJava()
def RunCompiler(js_files, externs=[]):
args = [_java_executable, '-jar', _CLOSURE_COMPILER_JAR]
args.extend(['--compilation_level', 'SIMPLE_OPTIMIZATIONS'])
args.extend(['--jscomp_error=%s' % error for error in _JSCOMP_ERRORS])
args.extend(['--language_in', 'ECMASCRIPT5'])
args.extend(['--externs=%s' % extern for extern in externs])
args.extend(['--js=%s' % js for js in js_files])
args.extend(['--js_output_file', '/dev/null'])
output = _ExecuteCommand(args, ignore_exit_status=True)
success = len(output) == 0
return success, output
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