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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 sys
import string
import argparse
import subprocess
import buildconfig
from mozbuild import shellutil
# 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 DOMString %s;\n" % (", ".join(extendedAttrs),
propName)
def generate(output, idlFilename, preprocessorHeader):
cpp = list(buildconfig.substs['CPP'])
cpp += shellutil.split(buildconfig.substs['ACDEFINES'])
cpp.append(preprocessorHeader)
preprocessed = subprocess.check_output(cpp)
propList = eval(preprocessed)
props = ""
for [name, prop, id, flags, pref, proptype] in propList:
if "CSS_PROPERTY_INTERNAL" in flags:
continue
# Unfortunately, even some of the getters here are fallible
# (e.g. on nsComputedDOMStyle).
extendedAttrs = ["Throws", "TreatNullAs=EmptyString"]
if pref is not "":
extendedAttrs.append('Pref="%s"' % pref)
# webkit properties get a capitalized "WebkitFoo" accessor (added here)
# as well as a camelcase "webkitFoo" accessor (added next).
if (prop.startswith("Webkit")):
props += generateLine(prop, extendedAttrs)
# Generate a line with camelCase spelling of property-name (or capitalized,
# for Moz-prefixed properties):
if not prop.startswith("Moz"):
prop = prop[0].lower() + prop[1:]
props += generateLine(prop, extendedAttrs)
# 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 above generatePropLine() call
# covered (3) and all of (1) except "float". If we now output attributes
# for all the cases where "name" doesn't match "prop", that will cover
# "float" and (2).
if prop != name:
extendedAttrs.append('BinaryName="%s"' % prop)
# Throw in a '_' before the attribute name, because some of these
# property names collide with IDL reserved words.
props += generateLine("_" + name, 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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