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#!/usr/bin/python
# Copyright (c) 2012 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.
"""Utilities for formatting and writing DEPS files."""
import re
import sys
# Used by Varify() to automatically convert variable names tagged with this
# prefix into Var('<variable name>').
VARIFY_MARKER_TAG_PREFIX = 'VARIFY_MARKER_TAG_'
class VarImpl(object):
"""Implement the Var function used within the DEPS file."""
def __init__(self, local_scope):
self._local_scope = local_scope
def Lookup(self, var_name):
"""Implements the Var syntax."""
if var_name in self._local_scope.get('vars', {}):
return self._local_scope['vars'][var_name]
raise Exception('Var is not defined: %s' % var_name)
def GetDepsContent(deps_path):
"""Read a DEPS file and return all the sections."""
deps_file = open(deps_path, 'rU')
content = deps_file.read()
local_scope = {}
var = VarImpl(local_scope)
global_scope = {
'Var': var.Lookup,
'deps': {},
'deps_os': {},
'include_rules': [],
'skip_child_includes': [],
'hooks': [],
}
exec(content, global_scope, local_scope)
local_scope.setdefault('deps', {})
local_scope.setdefault('deps_os', {})
local_scope.setdefault('include_rules', [])
local_scope.setdefault('skip_child_includes', [])
local_scope.setdefault('hooks', [])
local_scope.setdefault('vars', {})
return (local_scope['deps'], local_scope['deps_os'],
local_scope['include_rules'], local_scope['skip_child_includes'],
local_scope['hooks'], local_scope['vars'])
def PrettyDeps(deps, indent=0):
"""Stringify a deps dictionary in a pretty way."""
pretty = ' ' * indent
pretty += '{\n'
indent += 4
for item in sorted(deps):
if type(deps[item]) == dict:
value = PrettyDeps(deps[item], indent)
else:
value = ' ' * (indent + 4)
if deps[item] is None:
value += str(deps[item])
else:
value += '\'%s\'' % str(deps[item])
pretty += ' ' * indent
pretty += '\'%s\':\n' % item
pretty += '%s,\n' % value
indent -= 4
pretty += ' ' * indent
pretty += '}'
return pretty
def PrettyObj(obj):
"""Stringify an object in a pretty way."""
pretty = str(obj).replace('{', '{\n ')
pretty = pretty.replace('}', '\n}')
pretty = pretty.replace('[', '[\n ')
pretty = pretty.replace(']', '\n]')
pretty = pretty.replace('\':', '\':\n ')
pretty = pretty.replace(', ', ',\n ')
return pretty
def Varify(deps):
"""Replace all instances of our git server with a git_url var."""
deps = deps.replace(
'\'https://chromium.googlesource.com/chromium/blink.git',
'Var(\'webkit_url\')')
deps = deps.replace(
'\'https://chromium.googlesource.com', 'Var(\'git_url\') + \'')
deps = deps.replace(
'\'https://git.chromium.org', 'Var(\'git_url\') + \'')
deps = deps.replace('VAR_WEBKIT_REV\'', ' + Var(\'webkit_rev\')')
# Try to replace all instances of form "marker_prefix_<name>'" with
# "' + Var('<name>')". If there are no matches, nothing is done.
deps = re.sub(VARIFY_MARKER_TAG_PREFIX + '_(\w+)\'',
lambda match: '\' + Var(\'%s\')' % match.group(1), deps)
return deps
def WriteDeps(deps_file_name, deps_vars, deps, deps_os, include_rules,
skip_child_includes, hooks):
"""Given all the sections in a DEPS file, write it to disk."""
new_deps = ('# DO NOT EDIT EXCEPT FOR LOCAL TESTING.\n'
'# THIS IS A GENERATED FILE.\n',
'# ALL MANUAL CHANGES WILL BE OVERWRITTEN.\n',
'# SEE http://code.google.com/p/chromium/wiki/UsingGit\n',
'# FOR HOW TO ROLL DEPS\n'
'vars = %s\n\n' % PrettyObj(deps_vars),
'deps = %s\n\n' % Varify(PrettyDeps(deps)),
'deps_os = %s\n\n' % Varify(PrettyDeps(deps_os)),
'include_rules = %s\n\n' % PrettyObj(include_rules),
'skip_child_includes = %s\n\n' % PrettyObj(skip_child_includes),
'hooks = %s\n' % PrettyObj(hooks))
new_deps = ''.join(new_deps)
if deps_file_name:
deps_file = open(deps_file_name, 'wb')
else:
deps_file = sys.stdout
try:
deps_file.write(new_deps)
finally:
if deps_file_name:
deps_file.close()
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