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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
"""
This script implements the `mach devtools-css-db` command. It runs an xpcshell script
that uses inIDOMUtils to query the CSS properties used by the browser. This information
is used to generate the properties-db.js file.
"""
import json
import os
import sys
import string
import subprocess
from mozbuild.base import (
MozbuildObject,
MachCommandBase,
)
from mach.decorators import (
CommandProvider,
Command,
)
def resolve_path(start, relativePath):
"""Helper to resolve a path from a start, and a relative path"""
return os.path.normpath(os.path.join(start, relativePath))
def stringify(obj):
"""Helper to stringify to JSON"""
return json.dumps(obj, sort_keys=True, indent=2, separators=(',', ': '))
@CommandProvider
class MachCommands(MachCommandBase):
@Command(
'devtools-css-db', category='post-build',
description='Rebuild the devtool\'s static css properties database.')
def generate_css_db(self):
"""Generate the static css properties database for devtools and write it to file."""
print("Re-generating the css properties database...")
db = self.get_properties_db_from_xpcshell()
self.output_template({
'cssProperties': stringify(db['cssProperties']),
'pseudoElements': stringify(db['pseudoElements'])})
def get_properties_db_from_xpcshell(self):
"""Generate the static css properties db for devtools from an xpcshell script."""
build = MozbuildObject.from_environment()
# Get the paths
script_path = resolve_path(self.topsrcdir,
'devtools/shared/css/generated/generate-properties-db.js')
gre_path = resolve_path(self.topobjdir, 'dist/bin')
browser_path = resolve_path(self.topobjdir, 'dist/bin/browser')
xpcshell_path = build.get_binary_path(what='xpcshell')
print(browser_path)
sub_env = dict(os.environ)
if sys.platform.startswith('linux'):
sub_env["LD_LIBRARY_PATH"] = gre_path
# Run the xcpshell script, and set the appdir flag to the browser path so that
# we have the proper dependencies for requiring the loader.
contents = subprocess.check_output([xpcshell_path, '-g', gre_path,
'-a', browser_path, script_path],
env = sub_env)
# Extract just the output between the delimiters as the xpcshell output can
# have extra output that we don't want.
contents = contents.split('DEVTOOLS_CSS_DB_DELIMITER')[1]
return json.loads(contents)
def output_template(self, substitutions):
"""Output a the properties-db.js from a template."""
js_template_path = resolve_path(self.topsrcdir,
'devtools/shared/css/generated/properties-db.js.in')
destination_path = resolve_path(self.topsrcdir,
'devtools/shared/css/generated/properties-db.js')
with open(js_template_path, 'rb') as handle:
js_template = handle.read()
preamble = '/* THIS IS AN AUTOGENERATED FILE. DO NOT EDIT */\n\n'
contents = string.Template(js_template).substitute(substitutions)
with open(destination_path, 'wb') as destination:
destination.write(preamble + contents)
print('The database was successfully generated at ' + destination_path)
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