IfAction.cs

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namespace System.Xml.Xsl.XsltOld;
 
internal class IfAction : ContainerAction
{
    internal enum ConditionType
    {
        ConditionIf,
        ConditionWhen,
        ConditionOtherwise
    }
 
    private readonly ConditionType _type;
 
    private int _testKey = -1;
 
    internal IfAction(ConditionType type)
    {
        _type = type;
    }
 
    internal override void Compile(Compiler compiler)
    {
        CompileAttributes(compiler);
        if (_type != ConditionType.ConditionOtherwise)
        {
            CheckRequiredAttribute(compiler, _testKey != -1, "test");
        }
        if (compiler.Recurse())
        {
            CompileTemplate(compiler);
            compiler.ToParent();
        }
    }
 
    internal override bool CompileAttribute(Compiler compiler)
    {
        string localName = compiler.Input.LocalName;
        string value = compiler.Input.Value;
        if (Ref.Equal(localName, compiler.Atoms.Test))
        {
            if (_type == ConditionType.ConditionOtherwise)
            {
                return false;
            }
            _testKey = compiler.AddBooleanQuery(value);
            return true;
        }
        return false;
    }
 
    internal override void Execute(Processor processor, ActionFrame frame)
    {
        switch (frame.State)
        {
        case 0:
            if ((_type == ConditionType.ConditionIf || _type == ConditionType.ConditionWhen) && !processor.EvaluateBoolean(frame, _testKey))
            {
                frame.Finished();
                break;
            }
            processor.PushActionFrame(frame);
            frame.State = 1;
            break;
        case 1:
            if (_type == ConditionType.ConditionWhen || _type == ConditionType.ConditionOtherwise)
            {
                frame.Exit();
            }
            frame.Finished();
            break;
        }
    }
}