OutputScopeManager.cs

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namespace System.Xml.Xsl.Xslt;
 
internal sealed class OutputScopeManager
{
    public struct ScopeReord
    {
        public int scopeCount;
 
        public string prefix;
 
        public string nsUri;
    }
 
    private ScopeReord[] _records = new ScopeReord[32];
 
    private int _lastRecord;
 
    private int _lastScopes;
 
    public OutputScopeManager()
    {
        Reset();
    }
 
    public void Reset()
    {
        _records[0].prefix = null;
        _records[0].nsUri = null;
        PushScope();
    }
 
    public void PushScope()
    {
        _lastScopes++;
    }
 
    public void PopScope()
    {
        if (0 < _lastScopes)
        {
            _lastScopes--;
            return;
        }
        while (_records[--_lastRecord].scopeCount == 0)
        {
        }
        _lastScopes = _records[_lastRecord].scopeCount;
        _lastScopes--;
    }
 
    public void AddNamespace(string prefix, string uri)
    {
        AddRecord(prefix, uri);
    }
 
    private void AddRecord(string prefix, string uri)
    {
        _records[_lastRecord].scopeCount = _lastScopes;
        _lastRecord++;
        if (_lastRecord == _records.Length)
        {
            ScopeReord[] array = new ScopeReord[_lastRecord * 2];
            Array.Copy(_records, array, _lastRecord);
            _records = array;
        }
        _lastScopes = 0;
        _records[_lastRecord].prefix = prefix;
        _records[_lastRecord].nsUri = uri;
    }
 
    public void InvalidateAllPrefixes()
    {
        if (_records[_lastRecord].prefix != null)
        {
            AddRecord(null, null);
        }
    }
 
    public void InvalidateNonDefaultPrefixes()
    {
        string text = LookupNamespace(string.Empty);
        if (text == null)
        {
            InvalidateAllPrefixes();
        }
        else if (_records[_lastRecord].prefix.Length != 0 || _records[_lastRecord - 1].prefix != null)
        {
            AddRecord(null, null);
            AddRecord(string.Empty, text);
        }
    }
 
    public string LookupNamespace(string prefix)
    {
        int num = _lastRecord;
        while (_records[num].prefix != null)
        {
            if (_records[num].prefix == prefix)
            {
                return _records[num].nsUri;
            }
            num--;
        }
        return null;
    }
}