public object PrecedenceTesting(string expression)
{
IParser parser = Factory.Instance.Create();
IToken token = parser.Compile(expression);
return(token.EvalValue(null));
}
public void ParsingFailure(string expression, Type errType)
{
TestDelegate handler = new TestDelegate(() => {
IParser parser = Factory.Instance.Create();
IToken token = parser.Compile(expression);
token.EvalValue(null);
});
Assert.Throws(errType, handler);
}
public override void Compile(ICompileContext context)
{
if (context.Cut == null)
{
previous.Compile(context);
}
else
{
var success = Label();
context.Child(previous, null, context.Result, success, context.Failure);
context.Append(Label(success));
context.Append(Assign(context.Cut, Constant(true)));
context.Succeed();
}
}
public object Run(string expression)
{
Func <string, object> func = name => {
switch (name.ToLower())
{
case "a":
return(1);
case "b":
return(2);
case "c":
return(3);
default:
return(null);
}
};
IParser parser = Factory.Instance.Create();
return(parser.Compile(expression).EvalValue(func));
}
public override void Compile(ICompileContext context) => _inner.Compile(context);
