72 lines
2.3 KiB
Python
72 lines
2.3 KiB
Python
# Copyright 2010 The Closure Library Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS-IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Utility to use the Closure Compiler CLI from Python."""
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import distutils.version
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import logging
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import re
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import subprocess
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# Pulls a version number from the first line of 'java -version'
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# See http://java.sun.com/j2se/versioning_naming.html to learn more about the
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# command's output format.
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_VERSION_REGEX = re.compile('"([0-9][.0-9]*)')
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def _GetJavaVersion():
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"""Returns the string for the current version of Java installed."""
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proc = subprocess.Popen(['java', '-version'], stderr=subprocess.PIPE)
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unused_stdoutdata, stderrdata = proc.communicate()
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version_line = stderrdata.splitlines()[0]
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return _VERSION_REGEX.search(version_line).group(1)
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def Compile(compiler_jar_path, source_paths, flags=None):
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"""Prepares command-line call to Closure Compiler.
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Args:
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compiler_jar_path: Path to the Closure compiler .jar file.
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source_paths: Source paths to build, in order.
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flags: A list of additional flags to pass on to Closure Compiler.
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Returns:
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The compiled source, as a string, or None if compilation failed.
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"""
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# User friendly version check.
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if not (distutils.version.LooseVersion(_GetJavaVersion()) >=
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distutils.version.LooseVersion('1.6')):
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logging.error('Closure Compiler requires Java 1.6 or higher. '
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'Please visit http://www.java.com/getjava')
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return
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args = ['java', '-jar', compiler_jar_path]
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for path in source_paths:
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args += ['--js', path]
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if flags:
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args += flags
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logging.info('Compiling with the following command: %s', ' '.join(args))
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proc = subprocess.Popen(args, stdout=subprocess.PIPE)
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stdoutdata, unused_stderrdata = proc.communicate()
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if proc.returncode != 0:
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return
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return stdoutdata
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