private SyntaxNode ParseClassDeclaration()
{
Consume(TokenType.Identifier, "Expect class name.");
Token name = Previous();
VariableExpression superclass = null;
if (Match(TokenType.Less))
{
Consume(TokenType.Identifier, "Expect superclass name");
superclass = new VariableExpression(Previous());
}
Consume(TokenType.LeftBrace, "Expect '{' before class body.");
List <FunctionStatement> methods = new List <FunctionStatement>();
while (!Check(TokenType.RightBrace) && !IsAtEnd())
{
methods.Add((FunctionStatement)ParseFunctionDeclaration("method"));
}
Consume(TokenType.RightBrace, "Expect '}' after class Body.");
return(new ClassStatement(name, superclass, methods));
}
private object EvaluateVariableExpression(VariableExpression expr)
{
return(LookupVariable(expr.Name, expr));
}
public ClassStatement(Token name, VariableExpression superclass, List <FunctionStatement> methods)
{
Name = name;
Methods = methods;
SuperClass = superclass;
}
