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

mojo/public/tools/bindings/generators/mojom_cpp_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 C++ 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 205 matching lines @@
     if token.imported_from:
       name.extend(NamespaceToArray(token.namespace))
     if token.parent_kind:
       name.append(token.parent_kind.name)
     if isinstance(token, mojom.EnumValue):
       name.append(
           "%s_%s" % (generator.CamelCaseToAllCaps(token.enum_name), token.name))
     else:
       name.append(token.name)
     return "::".join(name)
+
+  if kind == mojom.DOUBLE:
+    if token == "Inf" or token == "+Inf":
+      return "std::numeric_limits<double>::infinity()"

[viettrungluu, 2014/08/14 22:32:25]

This (and everything else) probably creates a static initializer if used for
constant values, in C++03. It may be better to use the C macros from <math.h>.

+    if token == "-Inf":
+      return "-std::numeric_limits<double>::infinity()"
+    if token == "NaN":
+      return "std::numeric_limits<double>::quiet_NaN()"
+
+  if kind == mojom.FLOAT:
+    if token == "Inf" or token == "+Inf":
+      return "std::numeric_limits<float>::infinity()"
+    if token == "-Inf":
+      return "-std::numeric_limits<float>::infinity()"
+    if token == "NaN":
+      return "std::numeric_limits<float>::quiet_NaN()"
+
   return '%s%s' % (token, _kind_to_cpp_literal_suffix.get(kind, ''))
 
 def ExpressionToText(value, kind=None):
   return TranslateConstants(value, kind)
 
 def HasCallbacks(interface):
   for method in interface.methods:
     if method.response_parameters != None:
       return True
   return False
@@ skipping 64 matching lines @@
 
   @UseJinja("cpp_templates/module.cc.tmpl", filters=cpp_filters)
   def GenerateModuleSource(self):
     return self.GetJinjaExports()
 
   def GenerateFiles(self, args):
     self.Write(self.GenerateModuleHeader(), "%s.h" % self.module.name)
     self.Write(self.GenerateModuleInternalHeader(),
         "%s-internal.h" % self.module.name)
     self.Write(self.GenerateModuleSource(), "%s.cc" % self.module.name)