# Copyright 2020 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import argparse
import errno
import io
import json
import os
import sys
# For Node, EvaluateExpression
import grit.node.base
# For CheckConditionalElements
import grit.format.html_inline
_CWD = os.getcwd()
class PreprocessIfExprNode(grit.node.base.Node):
def __init__(self):
super().__init__()
def PreprocessIfExpr(self, content, removal_comments_extension):
return grit.format.html_inline.CheckConditionalElements(
self, content, removal_comments_extension)
def EvaluateCondition(self, expr):
return grit.node.base.Node.EvaluateExpression(expr, self.defines,
self.target_platform, {})
def SetDefines(self, defines):
self.defines = defines
def SetTargetPlatform(self, target_platform):
self.target_platform = target_platform
@staticmethod
def Construct(defines, target_platform):
node = PreprocessIfExprNode()
node.SetDefines(defines)
node.SetTargetPlatform(target_platform or sys.platform)
return node
def ParseDefinesArg(definesArg):
defines = {}
for define in definesArg:
parts = [part.strip() for part in define.split('=', 1)]
name = parts[0]
val = True if len(parts) == 1 else parts[1]
if (val == "1" or val == "true"):
val = True
elif (val == "0" or val == "false"):
val = False
defines[name] = val
return defines
def ExtensionForComments(input_file):
"""Get the file extension that determines the comment style.
Returns the file extension that determines the format of the
'grit-removed-lines' comments. '.ts' or '.js' will produce '/*...*/'-style
comments, '.html; will produce '<!-- -->'-style comments.
"""
split = os.path.splitext(input_file)
extension = split[1]
# .html.ts and .html.js files should still use HTML comments.
if os.path.splitext(split[0])[1] == '.html':
extension = '.html'
return extension
def main(argv):
parser = argparse.ArgumentParser()
parser.add_argument('--in-folder', required=True)
parser.add_argument('--out-folder', required=True)
parser.add_argument('--out-manifest')
parser.add_argument('--in-files', required=True, nargs="*")
parser.add_argument('-D', '--defines', action='append')
parser.add_argument('-E', '--environment')
parser.add_argument('-t', '--target')
parser.add_argument('--enable_removal_comments', action='store_true')
args = parser.parse_args(argv)
in_folder = os.path.normpath(os.path.join(_CWD, args.in_folder))
out_folder = os.path.normpath(os.path.join(_CWD, args.out_folder))
defines = ParseDefinesArg(args.defines)
node = PreprocessIfExprNode.Construct(defines, args.target)
for input_file in args.in_files:
in_path = os.path.join(in_folder, input_file)
content = ""
with open(in_path, encoding='utf-8') as f:
content = f.read()
removal_comments_extension = None # None means no removal comments
if args.enable_removal_comments:
removal_comments_extension = ExtensionForComments(input_file)
try:
preprocessed = node.PreprocessIfExpr(content, removal_comments_extension)
except:
raise Exception('Error processing %s' % in_path)
out_path = os.path.join(out_folder, input_file)
out_dir = os.path.dirname(out_path)
assert out_dir.startswith(out_folder), \
'Cannot preprocess files to locations not under %s.' % out_dir
try:
os.makedirs(out_dir)
except OSError as e:
# Ignore directory exists errors. This can happen if two build rules
# for overlapping directories hit the makedirs line at the same time.
if e.errno != errno.EEXIST:
raise
# Delete the target file before witing it, as it may be hardlinked to other
# files, which can break the build. This is the case in particular if the
# file was "copied" to different locations with GN (as GN's copy is actually
# a hard link under the hood). See https://crbug.com/1332497
if os.path.exists(out_path):
os.remove(out_path)
# Detect and delete any stale TypeScript files present in the output folder,
# corresponding to input .js files, since they can get picked up by
# subsequent ts_library() invocations and cause transient build failures.
# This can happen when a file is migrated from JS to TS and a bot is
# switched from building a later CL to building an earlier CL.
[pathname, extension] = os.path.splitext(out_path)
if extension == '.js':
to_check = pathname + '.ts'
if os.path.exists(to_check):
os.remove(to_check)
with open(out_path, mode='wb') as f:
f.write(preprocessed.encode('utf-8'))
if args.out_manifest:
manifest_data = {}
manifest_data['base_dir'] = '%s' % args.out_folder
manifest_data['files'] = args.in_files
manifest_file = open(
os.path.normpath(os.path.join(_CWD, args.out_manifest)), 'w',
encoding='utf-8', newline='\n')
json.dump(manifest_data, manifest_file)
return
if __name__ == '__main__':
main(sys.argv[1:])
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