internal sealed override InternalResult <TToken> Parse(IParseState <TToken> state)
{
var x = state.Peek();
if (!x.HasValue)
{
state.Error = new ParseError <TToken>(
x,
true,
Expected,
state.SourcePos,
null
);
return(InternalResult.Failure <TToken>(false));
}
var val = x.GetValueOrDefault();
if (!EqualityComparer <TToken> .Default.Equals(val, _token))
{
state.Error = new ParseError <TToken>(
x,
false,
Expected,
state.SourcePos,
null
);
return(InternalResult.Failure <TToken>(false));
}
state.Advance();
return(InternalResult.Success <TToken>(val, true));
}
internal sealed override Result <TToken, TToken> Parse(IParseState <TToken> state)
{
var x = state.Peek();
if (!x.HasValue)
{
return(Result.Failure <TToken, TToken>(
new ParseError <TToken>(
x,
true,
Expected,
state.SourcePos,
null
),
false
));
}
var val = x.GetValueOrDefault();
if (!_predicate(val))
{
return(Result.Failure <TToken, TToken>(
new ParseError <TToken>(
x,
false,
Expected,
state.SourcePos,
null
),
false
));
}
state.Advance();
return(Result.Success <TToken, TToken>(val, true));
}
private static Result <TToken, T> DoParse <TToken, T>(Parser <TToken, T> parser, IParseState <TToken> state)
{
using (state) // ensure we return the state's buffer to the buffer pool
{
state.Advance(); // pull the first element from the input
return(parser.Parse(state));
}
}
private static Result <TToken, T> DoParse <TToken, T>(Parser <TToken, T> parser, IParseState <TToken> state)
{
using (state) // ensure we return the state's buffer to the buffer pool
{
state.Advance(); // pull the first element from the input
var result = parser.Parse(state);
if (!result.Success)
{
return(new Result <TToken, T>(result.ConsumedInput, state.Error));
}
return(new Result <TToken, T>(result.ConsumedInput, result.Value));
}
}
internal sealed override Result <TToken, TEnumerable> Parse(IParseState <TToken> state)
{
var consumedInput = false;
foreach (var x in _valueList)
{
var result = state.Peek();
if (!result.HasValue)
{
return(Result.Failure <TToken, TEnumerable>(
new ParseError <TToken>(
result,
true,
Expected,
state.SourcePos,
null
),
consumedInput
));
}
TToken token = result.GetValueOrDefault();
if (!token.Equals(x))
{
return(Result.Failure <TToken, TEnumerable>(
new ParseError <TToken>(
result,
false,
Expected,
state.SourcePos,
null
),
consumedInput
));
}
consumedInput = true;
state.Advance();
}
return(Result.Success <TToken, TEnumerable>(_value, consumedInput));
}
internal sealed override InternalResult <string> Parse(IParseState <char> state)
{
var consumedInput = false;
var builder = new PooledStringBuilder(_value.Length);
foreach (var c in _value)
{
var result = state.Peek();
if (!result.HasValue)
{
state.Error = new ParseError <char>(
result,
true,
Expected,
state.SourcePos,
null
);
return(InternalResult.Failure <string>(consumedInput));
}
var token = result.GetValueOrDefault();
if (char.ToLowerInvariant(token) != c)
{
state.Error = new ParseError <char>(
result,
false,
Expected,
state.SourcePos,
null
);
return(InternalResult.Failure <string>(consumedInput));
}
consumedInput = true;
builder.Append(token);
state.Advance();
}
return(InternalResult.Success <string>(builder.GetStringAndClear(), consumedInput));
}
internal sealed override InternalResult <TEnumerable> Parse(IParseState <TToken> state)
{
var consumedInput = false;
foreach (var x in _valueTokens)
{
var result = state.Peek();
if (!result.HasValue)
{
state.Error = new ParseError <TToken>(
result,
true,
Expected,
state.SourcePos,
null
);
return(InternalResult.Failure <TEnumerable>(consumedInput));
}
TToken token = result.GetValueOrDefault();
if (!EqualityComparer <TToken> .Default.Equals(token, x))
{
state.Error = new ParseError <TToken>(
result,
false,
Expected,
state.SourcePos,
null
);
return(InternalResult.Failure <TEnumerable>(consumedInput));
}
consumedInput = true;
state.Advance();
}
return(InternalResult.Success <TEnumerable>(_value, consumedInput));
}
