internal override InternalResult <Unit> Parse(ref ParseState <char> state)
{
var startingLoc = state.Location;
var chunk = state.LookAhead(32);
while (chunk.Length > 0)
{
for (var i = 0; i < chunk.Length; i++)
{
if (!char.IsWhiteSpace(chunk[i]))
{
state.Advance(i);
return(InternalResult.Success(Unit.Value, state.Location > startingLoc));
}
}
state.Advance(chunk.Length);
chunk = state.LookAhead(32);
}
return(InternalResult.Success(Unit.Value, state.Location > startingLoc));
}
internal override bool TryParse(ref ParseState <char> state, ref ExpectedCollector <char> expecteds, out Unit result)
{
result = Unit.Value;
var chunk = state.LookAhead(32);
while (chunk.Length > 0)
{
for (var i = 0; i < chunk.Length; i++)
{
if (!char.IsWhiteSpace(chunk[i]))
{
state.Advance(i);
return(true);
}
}
state.Advance(chunk.Length);
chunk = state.LookAhead(32);
}
return(true);
}
internal sealed override bool TryParse(ref ParseState <TToken> state, ref ExpectedCollector <TToken> expecteds, out TEnumerable result)
{
var span = state.LookAhead(_valueTokens.Length); // span.Length <= _valueTokens.Length
var errorPos = -1;
for (var i = 0; i < span.Length; i++)
{
if (!EqualityComparer <TToken> .Default.Equals(span[i], _valueTokens[i]))
{
errorPos = i;
break;
}
}
if (errorPos != -1)
{
// strings didn't match
state.Advance(errorPos);
state.Error = new InternalError <TToken>(
Maybe.Just(span[errorPos]),
false,
state.Location,
null
);
expecteds.Add(new Expected <TToken>(_valueTokens));
result = default;
return(false);
}
if (span.Length < _valueTokens.Length)
{
// strings matched but reached EOF
state.Advance(span.Length);
state.Error = new InternalError <TToken>(
Maybe.Nothing <TToken>(),
true,
state.Location,
null
);
expecteds.Add(new Expected <TToken>(_valueTokens));
result = default;
return(false);
}
// OK
state.Advance(_valueTokens.Length);
result = _value;
return(true);
}
internal sealed override bool TryParse(ref ParseState <char> state, ref ExpectedCollector <char> expecteds, out string result)
{
var span = state.LookAhead(_value.Length); // span.Length <= _valueTokens.Length
var errorPos = -1;
for (var i = 0; i < span.Length; i++)
{
if (!char.ToLowerInvariant(span[i]).Equals(char.ToLowerInvariant(_value[i])))
{
errorPos = i;
break;
}
}
if (errorPos != -1)
{
// strings didn't match
state.Advance(errorPos);
state.Error = new InternalError <char>(
Maybe.Just(span[errorPos]),
false,
state.Location,
null
);
expecteds.Add(Expected);
result = null;
return(false);
}
if (span.Length < _value.Length)
{
// strings matched but reached EOF
state.Advance(span.Length);
state.Error = new InternalError <char>(
Maybe.Nothing <char>(),
true,
state.Location,
null
);
expecteds.Add(Expected);
result = null;
return(false);
}
// OK
state.Advance(_value.Length);
result = span.ToString();
return(true);
}
internal sealed override InternalResult <string> Parse(ref ParseState <char> state)
{
var span = state.LookAhead(_value.Length); // span.Length <= _valueTokens.Length
var errorPos = -1;
for (var i = 0; i < span.Length; i++)
{
if (!char.ToLowerInvariant(span[i]).Equals(char.ToLowerInvariant(_value[i])))
{
errorPos = i;
break;
}
}
if (errorPos != -1)
{
// strings didn't match
state.Advance(errorPos);
state.Error = new InternalError <char>(
Maybe.Just(span[errorPos]),
false,
state.Location,
null
);
state.AddExpected(Expected);
return(InternalResult.Failure <string>(errorPos > 0));
}
if (span.Length < _value.Length)
{
// strings matched but reached EOF
state.Advance(span.Length);
state.Error = new InternalError <char>(
Maybe.Nothing <char>(),
true,
state.Location,
null
);
state.AddExpected(Expected);
return(InternalResult.Failure <string>(span.Length > 0));
}
// OK
state.Advance(_value.Length);
return(InternalResult.Success <string>(span.ToString(), _value.Length > 0));
}
internal sealed override InternalResult <TEnumerable> Parse(ref ParseState <TToken> state)
{
var span = state.LookAhead(_valueTokens.Length); // span.Length <= _valueTokens.Length
var errorPos = -1;
for (var i = 0; i < span.Length; i++)
{
if (!EqualityComparer <TToken> .Default.Equals(span[i], _valueTokens[i]))
{
errorPos = i;
break;
}
}
if (errorPos != -1)
{
// strings didn't match
state.Advance(errorPos);
state.Error = new InternalError <TToken>(
Maybe.Just(span[errorPos]),
false,
state.Location,
null
);
state.AddExpected(new Expected <TToken>(_valueTokens));
return(InternalResult.Failure <TEnumerable>(errorPos > 0));
}
if (span.Length < _valueTokens.Length)
{
// strings matched but reached EOF
state.Advance(span.Length);
state.Error = new InternalError <TToken>(
Maybe.Nothing <TToken>(),
true,
state.Location,
null
);
state.AddExpected(new Expected <TToken>(_valueTokens));
return(InternalResult.Failure <TEnumerable>(span.Length > 0));
}
// OK
state.Advance(_valueTokens.Length);
return(InternalResult.Success <TEnumerable>(_value, _valueTokens.Length > 0));
}
