mirror of
https://bitbucket.org/chromiumembedded/cef
synced 2024-12-08 07:41:04 +01:00
207 lines
7.2 KiB
Python
207 lines
7.2 KiB
Python
# Copyright 2014 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.
|
|
# Deleted from Chromium in https://crrev.com/097f64c631.
|
|
|
|
"""Converts a given gypi file to a python scope and writes the result to stdout.
|
|
|
|
USING THIS SCRIPT IN CHROMIUM
|
|
|
|
Forking Python to run this script in the middle of GN is slow, especially on
|
|
Windows, and it makes both the GYP and GN files harder to follow. You can't
|
|
use "git grep" to find files in the GN build any more, and tracking everything
|
|
in GYP down requires a level of indirection. Any calls will have to be removed
|
|
and cleaned up once the GYP-to-GN transition is complete.
|
|
|
|
As a result, we only use this script when the list of files is large and
|
|
frequently-changing. In these cases, having one canonical list outweights the
|
|
downsides.
|
|
|
|
As of this writing, the GN build is basically complete. It's likely that all
|
|
large and frequently changing targets where this is appropriate use this
|
|
mechanism already. And since we hope to turn down the GYP build soon, the time
|
|
horizon is also relatively short. As a result, it is likely that no additional
|
|
uses of this script should every be added to the build. During this later part
|
|
of the transition period, we should be focusing more and more on the absolute
|
|
readability of the GN build.
|
|
|
|
|
|
HOW TO USE
|
|
|
|
It is assumed that the file contains a toplevel dictionary, and this script
|
|
will return that dictionary as a GN "scope" (see example below). This script
|
|
does not know anything about GYP and it will not expand variables or execute
|
|
conditions.
|
|
|
|
It will strip conditions blocks.
|
|
|
|
A variables block at the top level will be flattened so that the variables
|
|
appear in the root dictionary. This way they can be returned to the GN code.
|
|
|
|
Say your_file.gypi looked like this:
|
|
{
|
|
'sources': [ 'a.cc', 'b.cc' ],
|
|
'defines': [ 'ENABLE_DOOM_MELON' ],
|
|
}
|
|
|
|
You would call it like this:
|
|
gypi_values = exec_script("//build/gypi_to_gn.py",
|
|
[ rebase_path("your_file.gypi") ],
|
|
"scope",
|
|
[ "your_file.gypi" ])
|
|
|
|
Notes:
|
|
- The rebase_path call converts the gypi file from being relative to the
|
|
current build file to being system absolute for calling the script, which
|
|
will have a different current directory than this file.
|
|
|
|
- The "scope" parameter tells GN to interpret the result as a series of GN
|
|
variable assignments.
|
|
|
|
- The last file argument to exec_script tells GN that the given file is a
|
|
dependency of the build so Ninja can automatically re-run GN if the file
|
|
changes.
|
|
|
|
Read the values into a target like this:
|
|
component("mycomponent") {
|
|
sources = gypi_values.sources
|
|
defines = gypi_values.defines
|
|
}
|
|
|
|
Sometimes your .gypi file will include paths relative to a different
|
|
directory than the current .gn file. In this case, you can rebase them to
|
|
be relative to the current directory.
|
|
sources = rebase_path(gypi_values.sources, ".",
|
|
"//path/gypi/input/values/are/relative/to")
|
|
|
|
This script will tolerate a 'variables' in the toplevel dictionary or not. If
|
|
the toplevel dictionary just contains one item called 'variables', it will be
|
|
collapsed away and the result will be the contents of that dictinoary. Some
|
|
.gypi files are written with or without this, depending on how they expect to
|
|
be embedded into a .gyp file.
|
|
|
|
This script also has the ability to replace certain substrings in the input.
|
|
Generally this is used to emulate GYP variable expansion. If you passed the
|
|
argument "--replace=<(foo)=bar" then all instances of "<(foo)" in strings in
|
|
the input will be replaced with "bar":
|
|
|
|
gypi_values = exec_script("//build/gypi_to_gn.py",
|
|
[ rebase_path("your_file.gypi"),
|
|
"--replace=<(foo)=bar"],
|
|
"scope",
|
|
[ "your_file.gypi" ])
|
|
|
|
"""
|
|
|
|
from __future__ import absolute_import
|
|
from __future__ import print_function
|
|
from optparse import OptionParser
|
|
import os
|
|
import sys
|
|
|
|
try:
|
|
# May already be in the import path.
|
|
import gn_helpers
|
|
except ImportError as e:
|
|
# Add src/build to import path.
|
|
cef_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
|
|
src_dir = os.path.abspath(os.path.join(cef_dir, os.pardir))
|
|
sys.path.append(os.path.join(src_dir, 'build'))
|
|
import gn_helpers
|
|
|
|
|
|
def LoadPythonDictionary(path):
|
|
file_string = open(path).read()
|
|
try:
|
|
file_data = eval(file_string, {'__builtins__': None}, None)
|
|
except SyntaxError as e:
|
|
e.filename = path
|
|
raise
|
|
except Exception as e:
|
|
raise Exception("Unexpected error while reading %s: %s" % (path, str(e)))
|
|
|
|
assert isinstance(file_data, dict), "%s does not eval to a dictionary" % path
|
|
|
|
# Flatten any variables to the top level.
|
|
if 'variables' in file_data:
|
|
file_data.update(file_data['variables'])
|
|
del file_data['variables']
|
|
|
|
# Strip all elements that this script can't process.
|
|
elements_to_strip = [
|
|
'conditions',
|
|
'target_conditions',
|
|
'target_defaults',
|
|
'targets',
|
|
'includes',
|
|
'actions',
|
|
]
|
|
for element in elements_to_strip:
|
|
if element in file_data:
|
|
del file_data[element]
|
|
|
|
return file_data
|
|
|
|
|
|
def ReplaceSubstrings(values, search_for, replace_with):
|
|
"""Recursively replaces substrings in a value.
|
|
|
|
Replaces all substrings of the "search_for" with "repace_with" for all
|
|
strings occurring in "values". This is done by recursively iterating into
|
|
lists as well as the keys and values of dictionaries."""
|
|
if isinstance(values, str):
|
|
return values.replace(search_for, replace_with)
|
|
|
|
if isinstance(values, list):
|
|
return [ReplaceSubstrings(v, search_for, replace_with) for v in values]
|
|
|
|
if isinstance(values, dict):
|
|
# For dictionaries, do the search for both the key and values.
|
|
result = {}
|
|
for key, value in values.items():
|
|
new_key = ReplaceSubstrings(key, search_for, replace_with)
|
|
new_value = ReplaceSubstrings(value, search_for, replace_with)
|
|
result[new_key] = new_value
|
|
return result
|
|
|
|
# Assume everything else is unchanged.
|
|
return values
|
|
|
|
def main():
|
|
parser = OptionParser()
|
|
parser.add_option("-r", "--replace", action="append",
|
|
help="Replaces substrings. If passed a=b, replaces all substrs a with b.")
|
|
(options, args) = parser.parse_args()
|
|
|
|
if len(args) != 1:
|
|
raise Exception("Need one argument which is the .gypi file to read.")
|
|
|
|
data = LoadPythonDictionary(args[0])
|
|
if options.replace:
|
|
# Do replacements for all specified patterns.
|
|
for replace in options.replace:
|
|
split = replace.split('=')
|
|
# Allow "foo=" to replace with nothing.
|
|
if len(split) == 1:
|
|
split.append('')
|
|
assert len(split) == 2, "Replacement must be of the form 'key=value'."
|
|
data = ReplaceSubstrings(data, split[0], split[1])
|
|
|
|
# Sometimes .gypi files use the GYP syntax with percents at the end of the
|
|
# variable name (to indicate not to overwrite a previously-defined value):
|
|
# 'foo%': 'bar',
|
|
# Convert these to regular variables.
|
|
for key in data:
|
|
if len(key) > 1 and key[len(key) - 1] == '%':
|
|
data[key[:-1]] = data[key]
|
|
del data[key]
|
|
|
|
print(gn_helpers.ToGNString(data))
|
|
|
|
if __name__ == '__main__':
|
|
try:
|
|
main()
|
|
except Exception as e:
|
|
print(str(e))
|
|
sys.exit(1)
|