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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/.
import argparse
import runpy
import string
import sys
# Generates a line of WebIDL with the given spelling of the property name
# (whether camelCase, _underscorePrefixed, etc.) and the given array of
# extended attributes.
def generateLine(propName, extendedAttrs):
return " [%s] attribute [LegacyNullToEmptyString] UTF8String %s;\n" % (
", ".join(extendedAttrs),
propName,
)
def generate(output, idlFilename, dataFile):
propList = runpy.run_path(dataFile)["data"]
props = ""
for p in propList:
if "Internal" in p.flags:
continue
# Skip properties which aren't valid in style rules.
if "Style" not in p.rules:
continue
# Unfortunately, even some of the getters here are fallible
# (e.g. on nsComputedDOMStyle).
extendedAttrs = [
"CEReactions",
"Throws",
"SetterNeedsSubjectPrincipal=NonSystem",
]
if p.pref != "":
# BackdropFilter is a special case where we want WebIDL to check
# a function instead of checking the pref directly.
if p.method == "BackdropFilter":
extendedAttrs.append('Func="nsCSSProps::IsBackdropFilterAvailable"')
else:
extendedAttrs.append('Pref="%s"' % p.pref)
prop = p.method
# webkit properties get a camelcase "webkitFoo" accessor
# as well as a capitalized "WebkitFoo" alias (added here).
if prop.startswith("Webkit"):
extendedAttrs.append('BindingAlias="%s"' % prop)
# Generate a name with camelCase spelling of property-name (or capitalized,
# for Moz-prefixed properties):
if not prop.startswith("Moz"):
prop = prop[0].lower() + prop[1:]
# Per spec, what's actually supposed to happen here is that we're supposed
# to have properties for:
#
# 1) Each supported CSS property name, camelCased.
# 2) Each supported name that contains or starts with dashes,
# without any changes to the name.
# 3) cssFloat
#
# Note that "float" will cause a property called "float" to exist due to (1)
# in that list.
#
# In practice, cssFloat is the only case in which "name" doesn't contain
# "-" but also doesn't match "prop". So the generateLine() call will
# cover (3) and all of (1) except "float". If we now add an alias
# for all the cases where "name" doesn't match "prop", that will cover
# "float" and (2).
if prop != p.name:
extendedAttrs.append('BindingAlias="%s"' % p.name)
props += generateLine(prop, extendedAttrs)
idlFile = open(idlFilename, "r")
idlTemplate = idlFile.read()
idlFile.close()
output.write(
"/* THIS IS AN AUTOGENERATED FILE. DO NOT EDIT */\n\n"
+ string.Template(idlTemplate).substitute({"props": props})
+ "\n"
)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("idlFilename", help="IDL property file template")
parser.add_argument(
"preprocessorHeader", help="Header file to pass through the preprocessor"
)
args = parser.parse_args()
generate(sys.stdout, args.idlFilename, args.preprocessorHeader)
if __name__ == "__main__":
main()
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