Support converting referenced enum array into string.

tools/json_schema_compiler/cc_generator.py

Index: tools/json_schema_compiler/cc_generator.py
diff --git a/tools/json_schema_compiler/cc_generator.py b/tools/json_schema_compiler/cc_generator.py
index febd7bb769748ce159064a21336fdfaed0ed60ed..96492ba103056ce8a07358a5b30ec9e3df5fc7c9 100644
--- a/tools/json_schema_compiler/cc_generator.py
+++ b/tools/json_schema_compiler/cc_generator.py
@@ -366,12 +366,12 @@ class _Generator(object):
       # ANY is a base::Value which is abstract and cannot be a direct member, so
       # it will always be a pointer.
       is_ptr = prop.optional or prop.type_.property_type == PropertyType.ANY
-      c.Append('value->SetWithoutPathExpansion("%s", %s);' % (
+      c.Cblock(self._CreateValueFromType(
+          'value->SetWithoutPathExpansion("%s", %%s);' % prop.name,
           prop.name,
-          self._CreateValueFromType(cpp_namespace,
-                                    prop.type_,
-                                    prop_var,
-                                    is_ptr=is_ptr)))
+          prop.type_,
+          prop_var,
+          is_ptr=is_ptr))
 
       if prop.optional:
         c.Eblock('}')
@@ -390,11 +390,11 @@ class _Generator(object):
                       cpp_util.PadForGenerics(cpp_type))
           .Append('       additional_properties.begin();')
           .Append('   it != additional_properties.end(); ++it) {')
-          .Append('value->SetWithoutPathExpansion(it->first, %s);' %
-              self._CreateValueFromType(
-                  cpp_namespace,
-                  type_.additional_properties,
-                  '%sit->second' % ('*' if needs_unwrap else '')))
+          .Cblock(self._CreateValueFromType(
+              'value->SetWithoutPathExpansion(it->first, %s);',
+              type_.additional_properties.name,
+              type_.additional_properties,
+              '%sit->second' % ('*' if needs_unwrap else '')))
           .Eblock('}')
         )
 
@@ -414,10 +414,10 @@ class _Generator(object):
       (c.Sblock('if (%s) {' % choice_var)
           .Append('DCHECK(!result) << "Cannot set multiple choices for %s";' %
                       type_.unix_name)
-          .Append('result.reset(%s);' % self._CreateValueFromType(
-              cpp_namespace,
-              choice,
-              '*%s' % choice_var))
+          .Cblock(self._CreateValueFromType('result.reset(%s);',
+                                            choice.name,
+                                            choice,
+                                            '*%s' % choice_var))
         .Eblock('}')
       )
     (c.Append('DCHECK(result) << "Must set at least one choice for %s";' %
@@ -474,7 +474,7 @@ class _Generator(object):
     )
     return c
 
-  def _CreateValueFromType(self, cpp_namespace, type_, var, is_ptr=False):
+  def _CreateValueFromType(self, code, prop_name, type_, var, is_ptr=False):
     """Creates a base::Value given a type. Generated code passes ownership
     to caller.
 
@@ -482,6 +482,52 @@ class _Generator(object):
 
     E.g for std::string, generate new base::StringValue(var)
     """
+    c = Code()
+    underlying_type = self._type_helper.FollowRef(type_)
+    if underlying_type.property_type == PropertyType.ARRAY:
+      # Enums are treated specially because C++ templating thinks that they're
+      # ints, but really they're strings. So we create a vector of strings and
+      # populate it with the names of the enum in the array. The |ToString|
+      # function of the enum can be in another namespace when the enum is
+      # referenced. Templates can not be used here because C++ templating does
+      # not support passing a namespace as an argument.
+      item_type = self._type_helper.FollowRef(underlying_type.item_type)
+      if item_type.property_type == PropertyType.ENUM:
+        vardot = '(%s)%s' % (var, '->' if is_ptr else '.')
+
+        maybe_namespace = ''
+        if type_.item_type.property_type == PropertyType.REF:
+          maybe_namespace = '%s::' % item_type.namespace.unix_name
+
+        enum_list_var = '%s_list' % prop_name
+        # Scope the std::vector variable declaration inside braces.
+        (c.Sblock('{')
+          .Append('std::vector<std::string> %s;' % enum_list_var)
+          .Append('for (std::vector<%s>::const_iterator it = %sbegin();'
+              % (self._type_helper.GetCppType(item_type), vardot))
+          .Sblock('    it != %send(); ++it) {' % vardot)
+          .Append('%s.push_back(%sToString(*it));' % (enum_list_var,
+                                                      maybe_namespace))
+          .Eblock('}'))
+
+        # Because the std::vector above is always created for both required and
+        # optional enum arrays, |is_ptr| is set to false and uses the
+        # std::vector to create the values.
+        (c.Append(code %
+            self._GenerateCreateValueFromType(type_, enum_list_var, False))
+          .Eblock('}'))
+        return c
+
+    c.Append(code % self._GenerateCreateValueFromType(type_, var, is_ptr))
+    return c
+
+  def _GenerateCreateValueFromType(self, type_, var, is_ptr):
+    """Generates the statement to create a base::Value given a type.
+
+    type_:  The type of the values being converted.
+    var:    The name of the variable.
+    is_ptr: Whether |type_| is optional.
+    """
     underlying_type = self._type_helper.FollowRef(type_)
     if (underlying_type.property_type == PropertyType.CHOICES or
         underlying_type.property_type == PropertyType.OBJECT):
@@ -510,8 +556,6 @@ class _Generator(object):
               (vardot, vardot))
     elif underlying_type.property_type == PropertyType.ARRAY:
       return '%s.release()' % self._util_cc_helper.CreateValueFromArray(
-          cpp_namespace,
-          underlying_type,
           var,
           is_ptr)
     elif underlying_type.property_type.is_fundamental:
@@ -959,10 +1003,10 @@ class _Generator(object):
     for param in params:
       declaration_list.append(cpp_util.GetParameterDeclaration(
           param, self._type_helper.GetCppType(param.type_)))
-      c.Append('create_results->Append(%s);' % self._CreateValueFromType(
-          cpp_namespace,
-          param.type_,
-          param.unix_name))
+      c.Cblock(self._CreateValueFromType('create_results->Append(%s);',
+                                         param.name,
+                                         param.type_,
+                                         param.unix_name))
     c.Append('return create_results.Pass();')
     c.Eblock('}')
     c.Substitute({