public bool Emit <TDelegate>(CompilerContext <TDelegate> context, Label success)
{
var emit = context.Emit;
var localSuccess = emit.DefineLabel();
var end = emit.DefineLabel();
bool canFail = rule.Emit(context, localSuccess); // pos
if (canFail)
{
emit.Branch(end); // pos
}
emit.MarkLabel(localSuccess);
// start, pos
using (var pos = emit.DeclareLocal <int>())
using (var start = emit.DeclareLocal <int>())
{
emit.StoreLocal(pos); // start
emit.StoreLocal(start); // ...
context.EmitLoadString(pos, start); // v
emit.LoadLocal(pos); // v, pos
emit.Branch(success);
}
emit.MarkLabel(end);
return(canFail);
}
protected override void EmitLoadSuccess <TDelegate>(CompilerContext <TDelegate> context, Local pos, Local originalPos, string textToMatch)
{
if (keepTextToMatch)
{
context.Emit.LoadConstant(textToMatch);
}
else
{
context.EmitLoadString(pos, originalPos);
}
}
protected override void EmitSuccessLogic <TDelegate>(CompilerContext <TDelegate> context, Local pos, Local originalPosition)
{
context.EmitLoadString(pos, originalPosition);
}