QilStrConcatenator.cs

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using System.Text;
using System.Xml.Xsl.Qil;
using System.Xml.Xsl.XPath;
 
namespace System.Xml.Xsl.Xslt;
 
internal sealed class QilStrConcatenator
{
    private readonly XPathQilFactory _f;
 
    private readonly StringBuilder _builder;
 
    private QilList _concat;
 
    private bool _inUse;
 
    public QilStrConcatenator(XPathQilFactory f)
    {
        _f = f;
        _builder = new StringBuilder();
    }
 
    public void Reset()
    {
        _inUse = true;
        _builder.Length = 0;
        _concat = null;
    }
 
    private void FlushBuilder()
    {
        if (_concat == null)
        {
            _concat = _f.BaseFactory.Sequence();
        }
        if (_builder.Length != 0)
        {
            _concat.Add(_f.String(_builder.ToString()));
            _builder.Length = 0;
        }
    }
 
    public void Append(string value)
    {
        _builder.Append(value);
    }
 
    public void Append(char value)
    {
        _builder.Append(value);
    }
 
    public void Append(QilNode value)
    {
        if (value != null)
        {
            if (value.NodeType == QilNodeType.LiteralString)
            {
                _builder.Append((string)(QilLiteral)value);
                return;
            }
            FlushBuilder();
            _concat.Add(value);
        }
    }
 
    public QilNode ToQil()
    {
        _inUse = false;
        if (_concat == null)
        {
            return _f.String(_builder.ToString());
        }
        FlushBuilder();
        return _f.StrConcat(_concat);
    }
}