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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,
# This script generates properties/descriptor binding webidl based on
# ServoCSSPropList.
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, dataFile, ruleType, interfaceName, bindingTemplate, pref=None):
propsData = runpy.run_path(dataFile)["data"]
output.write(
"""/* THIS IS AN AUTOGENERATED FILE. DO NOT EDIT */
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
[Exposed=Window"""
)
if pref:
output.write(', Pref="' + pref + '"')
output.write(
"""]
interface """
+ interfaceName
+ " : CSSStyleDeclaration {\n"
)
for p in propsData.values():
# Skip properties which aren't valid in style rules.
if ruleType not in p.rules:
continue
if p.type() == "alias":
if p.pref == propsData[p.prop_id].pref:
# We already added this as a BindingAlias for the original prop.
continue
propId = p.prop_id
else:
propId = p.id
extendedAttrs = [
"BindingTemplate=(%s, eCSSProperty_%s)" % (bindingTemplate, propId),
"CEReactions",
"SetterThrows",
"SetterNeedsSubjectPrincipal=NonSystem",
]
if p.pref != "":
assert "Internal" not in p.flags
# 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"')
# MozTransform accessor is generated regardless, for compatibility,
elif p.method not in ["MozTransform", "MozTransformOrigin"]:
extendedAttrs.append('Pref="%s"' % p.pref)
elif "EnabledInUASheetsAndChrome" in p.flags:
extendedAttrs.append("ChromeOnly")
elif "Internal" in p.flags:
continue
def add_extra_accessors(p):
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)
return prop
prop = add_extra_accessors(p)
if p.type() != "alias":
for a in p.aliases:
if p.pref == propsData[a].pref:
newProp = add_extra_accessors(propsData[a])
extendedAttrs.append('BindingAlias="%s"' % newProp)
output.write(generateLine(prop, extendedAttrs))
output.write("};")
def generateCSS2Properties(output, dataFile):
generate(output, dataFile, "Style", "CSS2Properties", "CSS2Property")
def generateCSSPageDescriptors(output, dataFile):
generate(
output,
dataFile,
"Page",
"CSSPageDescriptors",
"CSSPageDescriptor",
)
def generateCSSPositionTryDescriptors(output, dataFile):
generate(
output,
dataFile,
"PositionTry",
"CSSPositionTryDescriptors",
"CSSPositionTryDescriptor",
"layout.css.anchor-positioning.enabled",
)