1 files changed, 104 insertions, 0 deletions
diff --git a/dom/bindings/GenerateCSS2PropertiesWebIDL.py b/dom/bindings/GenerateCSS2PropertiesWebIDL.py
new file mode 100644
index 0000000000..b74d8ef92d
--- /dev/null
+++ b/dom/bindings/GenerateCSS2PropertiesWebIDL.py
@@ -0,0 +1,104 @@
+# 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()