Mojo: add support for {double,float}.{INFINITY,NEGATIVE_INFINITY,NAN}

mojo/public/tools/bindings/generators/mojom_js_generator.py

 # Copyright 2013 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.
 
 """Generates JavaScript source files from a mojom.Module."""
 
 import mojom.generate.generator as generator
 import mojom.generate.module as mojom
 import mojom.generate.pack as pack
 from mojom.generate.template_expander import UseJinja
@@ skipping 23 matching lines @@
   mojom.STRING:                '""',
   mojom.NULLABLE_STRING:       '""'
 }
 
 
 def JavaScriptDefaultValue(field):
   if field.default:
     if mojom.IsStructKind(field.kind):
       assert field.default == "default"
       return "new %s()" % JavascriptType(field.kind)
-    return ExpressionToText(field.default)
+    return ExpressionToText(field.default, kind=field.kind)
   if field.kind in mojom.PRIMITIVES:
     return _kind_to_javascript_default_value[field.kind]
   if mojom.IsStructKind(field.kind):
     return "null"
   if mojom.IsArrayKind(field.kind):
     return "null"
   if mojom.IsInterfaceKind(field.kind) or \
      mojom.IsInterfaceRequestKind(field.kind):
     return _kind_to_javascript_default_value[mojom.MSGPIPE]
   if mojom.IsEnumKind(field.kind):
@@ skipping 76 matching lines @@
   if mojom.IsArrayKind(kind) and mojom.IsBoolKind(kind.kind):
     return "encodeArrayPointer(new codec.ArrayOf(codec.PackedBool), ";
   if mojom.IsAnyArrayKind(kind):
     return "encodeArrayPointer(%s, " % CodecType(kind.kind)
   if mojom.IsInterfaceKind(kind) or mojom.IsInterfaceRequestKind(kind):
     return JavaScriptEncodeSnippet(mojom.MSGPIPE)
   if mojom.IsEnumKind(kind):
     return JavaScriptEncodeSnippet(mojom.INT32)
 
 
-def TranslateConstants(token):
+def TranslateConstants(token, kind=None):
   if isinstance(token, (mojom.EnumValue, mojom.NamedValue)):
     # Both variable and enum constants are constructed like:
     # NamespaceUid.Struct[.Enum].CONSTANT_NAME
     name = []
     if token.imported_from:
       name.append(token.imported_from["unique_name"])
     if token.parent_kind:
       name.append(token.parent_kind.name)
     if isinstance(token, mojom.EnumValue):
       name.append(token.enum_name)
     name.append(token.name)
     return ".".join(name)
+
+  if kind == mojom.DOUBLE or kind == mojom.FLOAT:
+    if token == "Inf" or token == "+Inf":
+      return "Infinity"
+    if token == "-Inf":
+      return "-Infinity"
+    if token == "NaN":
+      return "NaN"
+
   return token
 
 
-def ExpressionToText(value):
-  return TranslateConstants(value)
+def ExpressionToText(value, kind=None):
+  return TranslateConstants(value, kind)
 
 
 def JavascriptType(kind):
   if kind.imported_from:
     return kind.imported_from["unique_name"] + "." + kind.name
   return kind.name
 
 
 class Generator(generator.Generator):
 
@@ skipping 23 matching lines @@
     self.Write(self.GenerateJsModule(), "%s.js" % self.module.name)
 
   def GetImports(self):
     # Since each import is assigned a variable in JS, they need to have unique
     # names.
     counter = 1
     for each in self.module.imports:
       each["unique_name"] = "import" + str(counter)
       counter += 1
     return self.module.imports