internal SqlTokenInfo(SqlTokenKind kind, char value)
{
Kind = kind;
ReadOnlySpan <char> ca = stackalloc char[1] {
value
};
Value = new string(ca);
}
internal SqlTokenInfo(SqlTokenKind kind, ReadOnlySpan <char> value)
{
Kind = kind;
Value = new string(value);
}
internal SqlTokenInfo(SqlTokenKind kind, StringBuilder value)
{
Kind = kind;
Value = value?.ToString();
}
internal SqlTokenInfo(SqlTokenKind kind, string value)
{
Kind = kind;
Value = value;
}
/// <summary>
/// Tokenizes the provided sql statement.
/// </summary>
/// <param name="reader"></param>
/// <param name="skipSundry">Do not emit sundry tokens (such as comments and whitespace) in the output.</param>
private static IReadOnlyCollection <SqlTokenInfo> Tokenize(SqlCharReader reader, bool skipSundry)
{
Debug.Assert(!(reader is null));
Span <char> peekBuffer = stackalloc char[2];
var tokens = new List <SqlTokenInfo>();
while (true)
{
reader.FillLength(peekBuffer, peekBuffer.Length, out var peekLength);
if (peekLength <= 0)
{
break;
}
SqlTokenInfo token;
SqlTokenKind kind = Peek(peekBuffer.Slice(0, peekLength));
switch (kind)
{
case SqlTokenKind.Whitespace:
token = ReadWhitespace(peekBuffer, peekLength, reader, skipSundry);
if (skipSundry)
{
continue;
}
break;
case SqlTokenKind.LineComment:
token = ReadLineComment(reader, skipSundry);
if (skipSundry)
{
continue;
}
break;
case SqlTokenKind.BlockComment:
token = ReadBlockComment(reader, skipSundry);
if (skipSundry)
{
continue;
}
break;
case SqlTokenKind.Literal:
token = ReadLiteral(peekBuffer, peekLength, reader);
break;
case SqlTokenKind.Symbol:
token = ReadSymbol(peekBuffer, peekLength, reader);
break;
case SqlTokenKind.SquareString:
token = ReadSquareString(peekBuffer, peekLength, reader);
break;
case SqlTokenKind.QuotedString:
token = ReadQuotedString(peekBuffer, peekLength, reader);
break;
default:
throw new InvalidOperationException($"Unknown {nameof(SqlTokenKind)}: {kind}");
}
tokens.Add(token);
}
return(tokens);
}
internal SqlTokenInfo(SqlTokenKind kind, char[] value, int offset, int count)
{
Kind = kind;
Value = new string(value, offset, count);
}
internal SqlTokenInfo(SqlTokenKind kind, params char[] value)
{
Kind = kind;
Value = value == null ? null : new string(value);
}