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#!/usr/bin/env python
#
# Copyright 2009 The Closure Library Authors. 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.
"""Generates out a Closure deps.js file given a list of JavaScript sources.
Paths can be specified as arguments or (more commonly) specifying trees
with the flags (call with --help for descriptions).
Usage: depswriter.py [path/to/js1.js [path/to/js2.js] ...]
"""
import logging
import optparse
import os
import posixpath
import shlex
import sys
import source
import treescan
__author__ = 'nnaze@google.com (Nathan Naze)'
def MakeDepsFile(source_map):
"""Make a generated deps file.
Args:
source_map: A dict map of the source path to source.Source object.
Returns:
str, A generated deps file source.
"""
# Write in path alphabetical order
paths = sorted(source_map.keys())
lines = []
for path in paths:
js_source = source_map[path]
# We don't need to add entries that don't provide anything.
if js_source.provides:
lines.append(_GetDepsLine(path, js_source))
return ''.join(lines)
def _GetDepsLine(path, js_source):
"""Get a deps.js file string for a source."""
provides = sorted(js_source.provides)
requires = sorted(js_source.requires)
return 'goog.addDependency(\'%s\', %s, %s);\n' % (path, provides, requires)
def _GetOptionsParser():
"""Get the options parser."""
parser = optparse.OptionParser(__doc__)
parser.add_option('--output_file',
dest='output_file',
action='store',
help=('If specified, write output to this path instead of '
'writing to standard output.'))
parser.add_option('--root',
dest='roots',
default=[],
action='append',
help='A root directory to scan for JS source files. '
'Paths of JS files in generated deps file will be '
'relative to this path. This flag may be specified '
'multiple times.')
parser.add_option('--root_with_prefix',
dest='roots_with_prefix',
default=[],
action='append',
help='A root directory to scan for JS source files, plus '
'a prefix (if either contains a space, surround with '
'quotes). Paths in generated deps file will be relative '
'to the root, but preceded by the prefix. This flag '
'may be specified multiple times.')
parser.add_option('--path_with_depspath',
dest='paths_with_depspath',
default=[],
action='append',
help='A path to a source file and an alternate path to '
'the file in the generated deps file (if either contains '
'a space, surround with whitespace). This flag may be '
'specified multiple times.')
return parser
def _NormalizePathSeparators(path):
"""Replaces OS-specific path separators with POSIX-style slashes.
Args:
path: str, A file path.
Returns:
str, The path with any OS-specific path separators (such as backslash on
Windows) replaced with URL-compatible forward slashes. A no-op on systems
that use POSIX paths.
"""
return path.replace(os.sep, posixpath.sep)
def _GetRelativePathToSourceDict(root, prefix=''):
"""Scans a top root directory for .js sources.
Args:
root: str, Root directory.
prefix: str, Prefix for returned paths.
Returns:
dict, A map of relative paths (with prefix, if given), to source.Source
objects.
"""
# Remember and restore the cwd when we're done. We work from the root so
# that paths are relative from the root.
start_wd = os.getcwd()
os.chdir(root)
path_to_source = {}
for path in treescan.ScanTreeForJsFiles('.'):
prefixed_path = _NormalizePathSeparators(os.path.join(prefix, path))
path_to_source[prefixed_path] = source.Source(source.GetFileContents(path))
os.chdir(start_wd)
return path_to_source
def _GetPair(s):
"""Return a string as a shell-parsed tuple. Two values expected."""
try:
# shlex uses '\' as an escape character, so they must be escaped.
s = s.replace('\\', '\\\\')
first, second = shlex.split(s)
return (first, second)
except:
raise Exception('Unable to parse input line as a pair: %s' % s)
def main():
"""CLI frontend to MakeDepsFile."""
logging.basicConfig(format=(sys.argv[0] + ': %(message)s'),
level=logging.INFO)
options, args = _GetOptionsParser().parse_args()
path_to_source = {}
# Roots without prefixes
for root in options.roots:
path_to_source.update(_GetRelativePathToSourceDict(root))
# Roots with prefixes
for root_and_prefix in options.roots_with_prefix:
root, prefix = _GetPair(root_and_prefix)
path_to_source.update(_GetRelativePathToSourceDict(root, prefix=prefix))
# Source paths
for path in args:
path_to_source[path] = source.Source(source.GetFileContents(path))
# Source paths with alternate deps paths
for path_with_depspath in options.paths_with_depspath:
srcpath, depspath = _GetPair(path_with_depspath)
path_to_source[depspath] = source.Source(source.GetFileContents(srcpath))
# Make our output pipe.
if options.output_file:
out = open(options.output_file, 'w')
else:
out = sys.stdout
out.write('// This file was autogenerated by %s.\n' % sys.argv[0])
out.write('// Please do not edit.\n')
out.write(MakeDepsFile(path_to_source))
if __name__ == '__main__':
main()
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