Generate isHTML*Element() / toHTML*Element() helper functions

Source/build/scripts/make_element_type_helpers.py

Index: Source/build/scripts/make_element_type_helpers.py
diff --git a/Source/build/scripts/make_element_type_helpers.py b/Source/build/scripts/make_element_type_helpers.py
new file mode 100755
index 0000000000000000000000000000000000000000..ff5c4491e381031f3c534f356f47f6343e6ff2f5
--- /dev/null
+++ b/Source/build/scripts/make_element_type_helpers.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import sys
+from collections import defaultdict
+
+import hasher
+import in_generator
+import name_utilities
+import template_expander
+
+from in_file import InFile
+
+
+class MakeElementTypeHelpersWriter(in_generator.Writer):
+    defaults = {
+        'interfaceName': None,
+        'noConstructor': None,
+        'JSInterfaceName': None,
+        'constructorNeedsCreatedByParser': None,
+        'constructorNeedsFormElement': None,
+        'contextConditional': None,
+        'interfaceName': None,
+        'noConstructor': None,
+        'runtimeEnabled': None,
+    }
+    default_parameters = {
+        'attrsNullNamespace': None,
+        'namespace': '',
+        'namespacePrefix': '',
+        'namespaceURI': '',
+        'fallbackInterfaceName': '',
+        'fallbackJSInterfaceName': '',
+    }
+    filters = {
+        'hash': hasher.hash,
+    }
+
+    def __init__(self, in_file_path):
+        super(MakeElementTypeHelpersWriter, self).__init__(in_file_path)
+
+        self.namespace = self.in_file.parameters['namespace'].strip('"')
+
+        assert self.namespace, 'A namespace is required.'
+
+        self._outputs = {
+            (self.namespace + "ElementTypeHelpers.h"): self.generate_helper_header,
+        }
+
+        self._template_context = {
+            'namespace': self.namespace,
+            'tags': self.in_file.name_dictionaries,
+        }
+
+        tags = self._template_context['tags']
+        interface_counts = defaultdict(int)
+        for tag in tags:
+            tag['interface'] = self._interface(tag)
+            interface_counts[tag['interface']] += 1
+
+        for tag in tags:
+            tag['multipleTagNames'] = interface_counts[tag['interface']] > 1
+
+    @template_expander.use_jinja("ElementTypeHelpers.h.tmpl", filters=filters)
+    def generate_helper_header(self):
+        return self._template_context
+
+    def _interface(self, tag):
+        if tag['interfaceName']:
+            return tag['interfaceName']
+        name = name_utilities.upper_first(tag['name'])
+        # FIXME: We shouldn't hard-code HTML here.
+        if name == 'HTML':
+            name = 'Html'
+        dash = name.find('-')
+        while dash != -1:
+            name = name[:dash] + name[dash + 1].upper() + name[dash + 2:]
+            dash = name.find('-')
+        return '%s%sElement' % (self.namespace, name)
+
+if __name__ == "__main__":
+    in_generator.Maker(MakeElementTypeHelpersWriter).main(sys.argv)