# 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 runpy # 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()