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#!/usr/bin/env python
#
# Copyright 2006 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.
"""Calculates Javascript dependencies without requiring Google3.
It iterates over a number of search paths and builds a dependency tree. With
the inputs provided, it walks the dependency tree and outputs all the files
required for compilation.\n
"""
try:
import distutils.version
except ImportError:
# distutils is not available in all environments
distutils = None
import logging
import optparse
import os
import re
import subprocess
import sys
req_regex = re.compile('goog\.require\s*\(\s*[\'\"]([^\)]+)[\'\"]\s*\)')
prov_regex = re.compile('goog\.provide\s*\(\s*[\'\"]([^\)]+)[\'\"]\s*\)')
ns_regex = re.compile('^ns:((\w+\.)*(\w+))$')
version_regex = re.compile('[\.0-9]+')
js_file_regex = re.compile(r'^.+\.js(\..*)?$')
def IsValidFile(ref):
"""Returns true if the provided reference is a file and exists."""
return os.path.isfile(ref)
def IsJsFile(ref):
"""Returns true if the provided reference is a Javascript file."""
return js_file_regex.match(ref)
# return ref.endswith('.js')
def IsNamespace(ref):
"""Returns true if the provided reference is a namespace."""
return re.match(ns_regex, ref) is not None
def IsDirectory(ref):
"""Returns true if the provided reference is a directory."""
return os.path.isdir(ref)
def ExpandDirectories(refs):
"""Expands any directory references into inputs.
Description:
Looks for any directories in the provided references. Found directories
are recursively searched for .js files, which are then added to the result
list.
Args:
refs: a list of references such as files, directories, and namespaces
Returns:
A list of references with directories removed and replaced by any
.js files that are found in them. Also, the paths will be normalized.
"""
result = []
for ref in refs:
if IsDirectory(ref):
# Disable 'Unused variable' for subdirs
# pylint: disable-msg=W0612
for (directory, subdirs, filenames) in os.walk(ref):
for filename in filenames:
if IsJsFile(filename):
result.append(os.path.join(directory, filename))
else:
result.append(ref)
return map(os.path.normpath, result)
class DependencyInfo(object):
"""Represents a dependency that is used to build and walk a tree."""
def __init__(self, filename):
self.filename = filename
self.provides = []
self.requires = []
def __str__(self):
return '%s Provides: %s Requires: %s' % (self.filename,
repr(self.provides),
repr(self.requires))
def BuildDependenciesFromFiles(files):
"""Build a list of dependencies from a list of files.
Description:
Takes a list of files, extracts their provides and requires, and builds
out a list of dependency objects.
Args:
files: a list of files to be parsed for goog.provides and goog.requires.
Returns:
A list of dependency objects, one for each file in the files argument.
"""
result = []
filenames = set()
for filename in files:
if filename in filenames:
continue
# Python 3 requires the file encoding to be specified
if (sys.version_info[0] < 3):
file_handle = open(filename, 'r')
else:
file_handle = open(filename, 'r', encoding='utf8')
dep = DependencyInfo(filename)
try:
for line in file_handle:
if re.match(req_regex, line):
dep.requires.append(re.search(req_regex, line).group(1))
if re.match(prov_regex, line):
dep.provides.append(re.search(prov_regex, line).group(1))
finally:
file_handle.close()
result.append(dep)
filenames.add(filename)
return result
def BuildDependencyHashFromDependencies(deps):
"""Builds a hash for searching dependencies by the namespaces they provide.
Description:
Dependency objects can provide multiple namespaces. This method enumerates
the provides of each dependency and adds them to a hash that can be used
to easily resolve a given dependency by a namespace it provides.
Args:
deps: a list of dependency objects used to build the hash.
Raises:
Exception: If a multiple files try to provide the same namepace.
Returns:
A hash table { namespace: dependency } that can be used to resolve a
dependency by a namespace it provides.
"""
dep_hash = {}
for dep in deps:
for provide in dep.provides:
if provide in dep_hash:
raise Exception('Duplicate provide (%s) in (%s, %s)' % (
provide,
dep_hash[provide].filename,
dep.filename))
dep_hash[provide] = dep
return dep_hash
def CalculateDependencies(paths, inputs):
"""Calculates the dependencies for given inputs.
Description:
This method takes a list of paths (files, directories) and builds a
searchable data structure based on the namespaces that each .js file
provides. It then parses through each input, resolving dependencies
against this data structure. The final output is a list of files,
including the inputs, that represent all of the code that is needed to
compile the given inputs.
Args:
paths: the references (files, directories) that are used to build the
dependency hash.
inputs: the inputs (files, directories, namespaces) that have dependencies
that need to be calculated.
Raises:
Exception: if a provided input is invalid.
Returns:
A list of all files, including inputs, that are needed to compile the given
inputs.
"""
deps = BuildDependenciesFromFiles(paths + inputs)
search_hash = BuildDependencyHashFromDependencies(deps)
result_list = []
seen_list = []
for input_file in inputs:
if IsNamespace(input_file):
namespace = re.search(ns_regex, input_file).group(1)
if namespace not in search_hash:
raise Exception('Invalid namespace (%s)' % namespace)
input_file = search_hash[namespace].filename
if not IsValidFile(input_file) or not IsJsFile(input_file):
raise Exception('Invalid file (%s)' % input_file)
seen_list.append(input_file)
file_handle = open(input_file, 'r')
try:
for line in file_handle:
if re.match(req_regex, line):
require = re.search(req_regex, line).group(1)
ResolveDependencies(require, search_hash, result_list, seen_list)
finally:
file_handle.close()
result_list.append(input_file)
# All files depend on base.js, so put it first.
base_js_path = FindClosureBasePath(paths)
if base_js_path:
result_list.insert(0, base_js_path)
else:
logging.warning('Closure Library base.js not found.')
return result_list
def FindClosureBasePath(paths):
"""Given a list of file paths, return Closure base.js path, if any.
Args:
paths: A list of paths.
Returns:
The path to Closure's base.js file including filename, if found.
"""
for path in paths:
pathname, filename = os.path.split(path)
if filename == 'base.js':
f = open(path)
is_base = False
# Sanity check that this is the Closure base file. Check that this
# is where goog is defined.
for line in f:
if line.startswith('var goog = goog || {};'):
is_base = True
break
f.close()
if is_base:
return path
def ResolveDependencies(require, search_hash, result_list, seen_list):
"""Takes a given requirement and resolves all of the dependencies for it.
Description:
A given requirement may require other dependencies. This method
recursively resolves all dependencies for the given requirement.
Raises:
Exception: when require does not exist in the search_hash.
Args:
require: the namespace to resolve dependencies for.
search_hash: the data structure used for resolving dependencies.
result_list: a list of filenames that have been calculated as dependencies.
This variable is the output for this function.
seen_list: a list of filenames that have been 'seen'. This is required
for the dependency->dependant ordering.
"""
if require not in search_hash:
raise Exception('Missing provider for (%s)' % require)
dep = search_hash[require]
if not dep.filename in seen_list:
seen_list.append(dep.filename)
for sub_require in dep.requires:
ResolveDependencies(sub_require, search_hash, result_list, seen_list)
result_list.append(dep.filename)
def GetDepsLine(dep, base_path):
"""Returns a JS string for a dependency statement in the deps.js file.
Args:
dep: The dependency that we're printing.
base_path: The path to Closure's base.js including filename.
"""
return 'goog.addDependency("%s", %s, %s);' % (
GetRelpath(dep.filename, base_path), dep.provides, dep.requires)
def GetRelpath(path, start):
"""Return a relative path to |path| from |start|."""
# NOTE: Python 2.6 provides os.path.relpath, which has almost the same
# functionality as this function. Since we want to support 2.4, we have
# to implement it manually. :(
path_list = os.path.abspath(os.path.normpath(path)).split(os.sep)
start_list = os.path.abspath(
os.path.normpath(os.path.dirname(start))).split(os.sep)
common_prefix_count = 0
for i in range(0, min(len(path_list), len(start_list))):
if path_list[i] != start_list[i]:
break
common_prefix_count += 1
# Always use forward slashes, because this will get expanded to a url,
# not a file path.
return '/'.join(['..'] * (len(start_list) - common_prefix_count) +
path_list[common_prefix_count:])
def PrintLine(msg, out):
out.write(msg)
out.write('\n')
def PrintDeps(source_paths, deps, out):
"""Print out a deps.js file from a list of source paths.
Args:
source_paths: Paths that we should generate dependency info for.
deps: Paths that provide dependency info. Their dependency info should
not appear in the deps file.
out: The output file.
Returns:
True on success, false if it was unable to find the base path
to generate deps relative to.
"""
base_path = FindClosureBasePath(source_paths + deps)
if not base_path:
return False
PrintLine('// This file was autogenerated by calcdeps.py', out)
excludesSet = set(deps)
for dep in BuildDependenciesFromFiles(source_paths + deps):
if not dep.filename in excludesSet:
PrintLine(GetDepsLine(dep, base_path), out)
return True
def PrintScript(source_paths, out):
for index, dep in enumerate(source_paths):
PrintLine('// Input %d' % index, out)
f = open(dep, 'r')
PrintLine(f.read(), out)
f.close()
def GetJavaVersion():
"""Returns the string for the current version of Java installed."""
proc = subprocess.Popen(['java', '-version'], stderr=subprocess.PIPE)
proc.wait()
version_line = proc.stderr.read().splitlines()[0]
return version_regex.search(version_line).group()
def FilterByExcludes(options, files):
"""Filters the given files by the exlusions specified at the command line.
Args:
options: The flags to calcdeps.
files: The files to filter.
Returns:
A list of files.
"""
excludes = []
if options.excludes:
excludes = ExpandDirectories(options.excludes)
excludesSet = set(excludes)
return [i for i in files if not i in excludesSet]
def GetPathsFromOptions(options):
"""Generates the path files from flag options.
Args:
options: The flags to calcdeps.
Returns:
A list of files in the specified paths. (strings).
"""
search_paths = options.paths
if not search_paths:
search_paths = ['.'] # Add default folder if no path is specified.
search_paths = ExpandDirectories(search_paths)
return FilterByExcludes(options, search_paths)
def GetInputsFromOptions(options):
"""Generates the inputs from flag options.
Args:
options: The flags to calcdeps.
Returns:
A list of inputs (strings).
"""
inputs = options.inputs
if not inputs: # Parse stdin
logging.info('No inputs specified. Reading from stdin...')
inputs = filter(None, [line.strip('\n') for line in sys.stdin.readlines()])
logging.info('Scanning files...')
inputs = ExpandDirectories(inputs)
return FilterByExcludes(options, inputs)
def Compile(compiler_jar_path, source_paths, out, flags=None):
"""Prepares command-line call to Closure compiler.
Args:
compiler_jar_path: Path to the Closure compiler .jar file.
source_paths: Source paths to build, in order.
flags: A list of additional flags to pass on to Closure compiler.
"""
args = ['java', '-jar', compiler_jar_path]
for path in source_paths:
args += ['--js', path]
if flags:
args += flags
logging.info('Compiling with the following command: %s', ' '.join(args))
proc = subprocess.Popen(args, stdout=subprocess.PIPE)
(stdoutdata, stderrdata) = proc.communicate()
if proc.returncode != 0:
logging.error('JavaScript compilation failed.')
sys.exit(1)
else:
out.write(stdoutdata)
def main():
"""The entrypoint for this script."""
logging.basicConfig(format='calcdeps.py: %(message)s', level=logging.INFO)
usage = 'usage: %prog [options] arg'
parser = optparse.OptionParser(usage)
parser.add_option('-i',
'--input',
dest='inputs',
action='append',
help='The inputs to calculate dependencies for. Valid '
'values can be files, directories, or namespaces '
'(ns:goog.net.XhrLite). Only relevant to "list" and '
'"script" output.')
parser.add_option('-p',
'--path',
dest='paths',
action='append',
help='The paths that should be traversed to build the '
'dependencies.')
parser.add_option('-d',
'--dep',
dest='deps',
action='append',
help='Directories or files that should be traversed to '
'find required dependencies for the deps file. '
'Does not generate dependency information for names '
'provided by these files. Only useful in "deps" mode.')
parser.add_option('-e',
'--exclude',
dest='excludes',
action='append',
help='Files or directories to exclude from the --path '
'and --input flags')
parser.add_option('-o',
'--output_mode',
dest='output_mode',
action='store',
default='list',
help='The type of output to generate from this script. '
'Options are "list" for a list of filenames, "script" '
'for a single script containing the contents of all the '
'file, "deps" to generate a deps.js file for all '
'paths, or "compiled" to produce compiled output with '
'the Closure compiler.')
parser.add_option('-c',
'--compiler_jar',
dest='compiler_jar',
action='store',
help='The location of the Closure compiler .jar file.')
parser.add_option('-f',
'--compiler_flag',
'--compiler_flags', # for backwards compatability
dest='compiler_flags',
action='append',
help='Additional flag to pass to the Closure compiler. '
'May be specified multiple times to pass multiple flags.')
parser.add_option('--output_file',
dest='output_file',
action='store',
help=('If specified, write output to this path instead of '
'writing to standard output.'))
(options, args) = parser.parse_args()
search_paths = GetPathsFromOptions(options)
if options.output_file:
out = open(options.output_file, 'w')
else:
out = sys.stdout
if options.output_mode == 'deps':
result = PrintDeps(search_paths, ExpandDirectories(options.deps or []), out)
if not result:
logging.error('Could not find Closure Library in the specified paths')
sys.exit(1)
return
inputs = GetInputsFromOptions(options)
logging.info('Finding Closure dependencies...')
deps = CalculateDependencies(search_paths, inputs)
output_mode = options.output_mode
if output_mode == 'script':
PrintScript(deps, out)
elif output_mode == 'list':
# Just print out a dep per line
for dep in deps:
PrintLine(dep, out)
elif output_mode == 'compiled':
# Make sure a .jar is specified.
if not options.compiler_jar:
logging.error('--compiler_jar flag must be specified if --output is '
'"compiled"')
sys.exit(1)
# User friendly version check.
if distutils and not (distutils.version.LooseVersion(GetJavaVersion()) >
distutils.version.LooseVersion('1.6')):
logging.error('Closure Compiler requires Java 1.6 or higher.')
logging.error('Please visit http://www.java.com/getjava')
sys.exit(1)
Compile(options.compiler_jar, deps, out, options.compiler_flags)
else:
logging.error('Invalid value for --output flag.')
sys.exit(1)
if __name__ == '__main__':
main()
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