blob: 25e804c696aa7ebf78d5591fd5d7db35932fcb98 [file] [log] [blame]
# Copyright 2017 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.
"""Used by a js_binary action to compile javascript files.
This script takes in a list of sources and dependencies and compiles them all
together into a single compiled .js file. The dependencies are ordered in a
post-order, left-to-right traversal order. If multiple instances of the same
source file are read, only the first is kept. The script can also take in
optional --flags argument which will add custom flags to the compiler. Any
extern files can also be passed in using the --extern flag.
import argparse
import os
import sys
import compile2
def ParseDepList(dep):
"""Parses a dependency list, returns |sources, deps, externs|."""
assert os.path.isfile(dep), (dep +
' is not a js_library target')
with open(dep, 'r') as dep_list:
lines =
assert 'deps:' in lines, dep + ' is not formated correctly, missing "deps:"'
deps_start = lines.index('deps:')
assert 'externs:' in lines, dep + ' is not formated correctly, missing "externs:"'
externs_start = lines.index('externs:')
return (lines[1:deps_start],
def CrawlDepsTree(deps, sources, externs):
"""Parses the dependency tree creating a post-order listing of sources."""
for dep in deps:
cur_sources, cur_deps, cur_externs = ParseDepList(dep)
child_sources, child_externs = CrawlDepsTree(
cur_deps, cur_sources, cur_externs)
# Add child dependencies of this node first.
new_sources = child_sources
# Add the current node's sources and dedupe.
new_sources += [s for s in cur_sources if s not in new_sources]
# Add the original sources, none of which will be dependencies of this node,
# and dedupe.
new_sources += [s for s in sources if s not in new_sources]
sources = new_sources
externs += [e for e in cur_externs if e not in externs]
return sources, externs
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-c', '--compiler', required=True,
help='Path to compiler')
parser.add_argument('-s', '--sources', nargs='*', default=[],
help='List of js source files')
parser.add_argument('-o', '--output', required=True,
help='Compile to output')
parser.add_argument('-d', '--deps', nargs='*', default=[],
help='List of js_libarary dependencies')
parser.add_argument('-b', '--bootstrap',
help='A file to include before all others')
parser.add_argument('-cf', '--config', nargs='*', default=[],
help='A list of files to include after bootstrap and '
'before all others')
parser.add_argument('-f', '--flags', nargs='*', default=[],
help='A list of custom flags to pass to the compiler. '
'Do not include leading dashes')
parser.add_argument('-e', '--externs', nargs='*', default=[],
help='A list of extern files to pass to the compiler')
args = parser.parse_args()
sources, externs = CrawlDepsTree(args.deps, args.sources, args.externs)
compiler_args = ['--%s' % flag for flag in args.flags]
compiler_args += ['--externs=%s' % e for e in args.externs]
compiler_args += [
if args.bootstrap:
compiler_args += [args.bootstrap]
compiler_args += args.config
compiler_args += sources
returncode, errors = compile2.Checker().run_jar(args.compiler, compiler_args)
if returncode != 0:
print errors
return returncode
if __name__ == '__main__':