SubstitutionList.cs

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using System.Collections;
 
namespace System.Xml.Xsl.Qil;
 
internal sealed class SubstitutionList
{
    private readonly ArrayList _s;
 
    public SubstitutionList()
    {
        _s = new ArrayList(4);
    }
 
    public void AddSubstitutionPair(QilNode find, QilNode replace)
    {
        _s.Add(find);
        _s.Add(replace);
    }
 
    public void RemoveLastSubstitutionPair()
    {
        _s.RemoveRange(_s.Count - 2, 2);
    }
 
    public QilNode FindReplacement(QilNode n)
    {
        for (int num = _s.Count - 2; num >= 0; num -= 2)
        {
            if (_s[num] == n)
            {
                return (QilNode)_s[num + 1];
            }
        }
        return null;
    }
}