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

mojo/public/tools/bindings/pylib/mojom/parse/lexer.py

Index: mojo/public/tools/bindings/pylib/mojom/parse/lexer.py
diff --git a/mojo/public/tools/bindings/pylib/mojom/parse/lexer.py b/mojo/public/tools/bindings/pylib/mojom/parse/lexer.py
index 6104615f3fa7e6154036b0e8aa80c675297831c7..b890f232869fa596cb0854ed422634ca31d03ffc 100644
--- a/mojo/public/tools/bindings/pylib/mojom/parse/lexer.py
+++ b/mojo/public/tools/bindings/pylib/mojom/parse/lexer.py
@@ -78,7 +78,7 @@ class Lexer(object):
     # Constants
     'ORDINAL',
     'INT_CONST_DEC', 'INT_CONST_HEX',
-    'FLOAT_CONST',
+    'FLOAT_CONST', 'FLOAT_BUILTIN',
 
     # String literals
     'STRING_LITERAL',
@@ -146,6 +146,8 @@ class Lexer(object):
   floating_constant = \
       '(((('+fractional_constant+')'+ \
       exponent_part+'?)|([0-9]+'+exponent_part+')))'
+  floating_builtin = \
+      r"""(((double)|(float))\.((NAN)|((NEGATIVE_)?INFINITY)))"""
 
   # Ordinals
   ordinal = r'@[0-9]+'
@@ -200,6 +202,10 @@ class Lexer(object):
   def t_FLOAT_CONST(self, t):
     return t
 
+  @TOKEN(floating_builtin)
+  def t_FLOAT_BUILTIN(self, t):
+    return t
+
   @TOKEN(hex_constant)
   def t_INT_CONST_HEX(self, t):
     return t