adding Enums to grammar.txt

libsolidity/grammar.txt

@@ -1,7 +1,7 @@
 ContractDefinition = 'contract' Identifier
                      ( 'is' InheritanceSpecifier (',' InheritanceSpecifier )* )?
                      '{' ContractPart* '}'
-ContractPart = StateVariableDeclaration | StructDefinition | ModifierDefinition | FunctionDefinition
+ContractPart = StateVariableDeclaration | StructDefinition | ModifierDefinition | FunctionDefinition | EnumDefinition
 
 InheritanceSpecifier = Identifier ( '(' Expression ( ',' Expression )* ')' )?
 StructDefinition = 'struct' Identifier '{'
@@ -11,6 +11,9 @@ ModifierDefinition = 'modifier' Identifier ParameterList? Block
 FunctionDefinition = 'function' Identifier ParameterList
                      ( Identifier | 'constant' | 'public' | 'protected' | 'private' )*
                      ( 'returns' ParameterList )? Block
+
+EnumValue = Identifier
+EnumDefinition = 'enum' '{' EnumValue (',' EnumValue)* '}' ';'
 ParameterList = '(' ( VariableDeclaration (',' VariableDeclaration)* )? ')'
 // semantic restriction: mappings and structs (recursively) containing mappings
 // are not allowed in argument lists