/// <summary>
/// Combine two empty results.
/// </summary>
/// <typeparam name="T">The source type.</typeparam>
/// <typeparam name="TKind">The kind of token.</typeparam>
/// <param name="first">The first value to combine.</param>
/// <param name="second">The second value to combine.</param>
/// <returns>A result of type <typeparamref name="T"/> carrying information from both results.</returns>
public static TokenListParserResult <TKind, T> CombineEmpty <TKind, T>(TokenListParserResult <TKind, T> first, TokenListParserResult <TKind, T> second)
{
if (first.Remainder != second.Remainder)
{
return(second);
}
var expectations = first.Expectations;
if (expectations == null)
{
expectations = second.Expectations;
}
else if (second.Expectations != null)
{
expectations = new string[first.Expectations.Length + second.Expectations.Length];
var i = 0;
for (; i < first.Expectations.Length; ++i)
{
expectations[i] = first.Expectations[i];
}
for (var j = 0; j < second.Expectations.Length; ++i, ++j)
{
expectations[i] = second.Expectations[j];
}
}
return(new TokenListParserResult <TKind, T>(second.Remainder, second.SubTokenErrorPosition, first.ErrorMessage, expectations, second.Backtrack));
}
/// <summary>
/// Consume a token from the start of the list, returning a result with the token and remainder.
/// </summary>
/// <returns></returns>
public TokenListParserResult <TKind, Token <TKind> > ConsumeToken()
{
EnsureHasValue();
if (IsAtEnd)
{
return(TokenListParserResult.Empty <TKind, Token <TKind> >(this));
}
var token = _tokens ![Position];
/// <summary>
/// Consume a token from the start of the list, returning a result with the token and remainder.
/// </summary>
/// <returns></returns>
public TokenListParserResult <TKind, Token <TKind> > ConsumeToken()
{
EnsureHasValue();
if (IsAtEnd)
{
return(TokenListParserResult.Empty <TKind, Token <TKind> >(this));
}
var token = _tokens[Position];
return(TokenListParserResult.Value(token, this, new TokenList <TKind>(_tokens, Position + 1)));
}
/// <summary>
/// Combine two empty results.
/// </summary>
/// <typeparam name="T">The source type.</typeparam>
/// <typeparam name="TKind">The kind of token.</typeparam>
/// <param name="first">The first value to combine.</param>
/// <param name="second">The second value to combine.</param>
/// <returns>A result of type <typeparamref name="T"/> carrying information from both results.</returns>
public static TokenListParserResult <TKind, T> CombineEmpty <TKind, T>(TokenListParserResult <TKind, T> first, TokenListParserResult <TKind, T> second)
{
if (first.Remainder != second.Remainder)
{
return(second);
}
var expectations = first.Expectations;
if (expectations == null)
{
expectations = second.Expectations;
}
else if (second.Expectations != null)
{
expectations = new string[first.Expectations !.Length + second.Expectations.Length];
/// <summary>
/// Convert an empty result of one type into another.
/// </summary>
/// <typeparam name="TKind">The kind of token.</typeparam>
/// <typeparam name="T">The source type.</typeparam>
/// <typeparam name="U">The destination type.</typeparam>
/// <param name="result">The result to convert.</param>
/// <returns>The converted result.</returns>
public static TokenListParserResult <TKind, U> CastEmpty <TKind, T, U>(TokenListParserResult <TKind, T> result)
{
return(new TokenListParserResult <TKind, U>(result.Remainder, result.SubTokenErrorPosition, result.ErrorMessage, result.Expectations, result.Backtrack));
}