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-rw-r--r--dom/bindings/GenerateCSS2PropertiesWebIDL.py104
1 files changed, 104 insertions, 0 deletions
diff --git a/dom/bindings/GenerateCSS2PropertiesWebIDL.py b/dom/bindings/GenerateCSS2PropertiesWebIDL.py
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+++ b/dom/bindings/GenerateCSS2PropertiesWebIDL.py
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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()