Implement [LegacyUnenumerableNamedProperties] in the WebIDL parser

http://github.com/heycam/webidl/issues/82

components/script/dom/bindings/codegen/parser/WebIDL.py

@@ -1069,6 +1069,12 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
 
             specialMembersSeen[memberType] = member
 
+        if (self.getExtendedAttribute("LegacyUnenumerableNamedProperties") and
+            "named getters" not in specialMembersSeen):
+            raise WebIDLError("[LegacyUnenumerableNamedProperties] used on an interface "
+                              "without a named getter",
+                              [self.location])
+
         if self._isOnGlobalProtoChain:
             # Make sure we have no named setters, creators, or deleters
             for memberType in ["setter", "creator", "deleter"]:
@@ -1417,7 +1423,8 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
                   identifier == "UnsafeInPrerendering" or
                   identifier == "LegacyEventInit" or
                   identifier == "ProbablyShortLivingObject" or
-                  identifier == "Abstract"):
+                  identifier == "Abstract" or
+                  identifier == "LegacyUnenumerableNamedProperties"):
                 # Known extended attributes that do not take values
                 if not attr.noArguments():
                     raise WebIDLError("[%s] must take no arguments" % identifier,

components/script/dom/bindings/codegen/parser/legacy-unenumerable-named-properties.patch

@@ -0,0 +1,25 @@
+--- WebIDL.py
++++ WebIDL.py
+@@ -1069,6 +1069,12 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
+
+             specialMembersSeen[memberType] = member
+
++        if (self.getExtendedAttribute("LegacyUnenumerableNamedProperties") and
++            "named getters" not in specialMembersSeen):
++            raise WebIDLError("[LegacyUnenumerableNamedProperties] used on an interface "
++                              "without a named getter",
++                              [self.location])
++
+         if self._isOnGlobalProtoChain:
+             # Make sure we have no named setters, creators, or deleters
+             for memberType in ["setter", "creator", "deleter"]:
+@@ -1417,7 +1423,8 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
+                   identifier == "UnsafeInPrerendering" or
+                   identifier == "LegacyEventInit" or
+                   identifier == "ProbablyShortLivingObject" or
+-                  identifier == "Abstract"):
++                  identifier == "Abstract" or
++                  identifier == "LegacyUnenumerableNamedProperties"):
+                 # Known extended attributes that do not take values
+                 if not attr.noArguments():
+                     raise WebIDLError("[%s] must take no arguments" % identifier,

components/script/dom/bindings/codegen/parser/update.sh

@@ -1,4 +1,5 @@
 wget https://mxr.mozilla.org/mozilla-central/source/dom/bindings/parser/WebIDL.py?raw=1 -O WebIDL.py
 patch < abstract.patch
+patch < legacy-unenumerable-named-properties.patch
 
 # TODO: update test files from https://dxr.mozilla.org/mozilla-central/source/dom/bindings/parser/tests