public void Parse()
{
_sourceEnumeratorField?.Dispose();
_sourceEnumeratorField = Source.GetEnumerator();
_inputTokenField = GetNextToken();
Begin("Expression");
LogicalExpression();
Match("EOP");
End();
}
public ParseResult Parse()
{
_sourceEnumerator?.Dispose();
_sourceEnumerator = Source.GetEnumerator();
_inputToken = GetNextToken();
Begin("Expression");
LogicalExpression();
Match("EOP");
End();
return _result;
}
public IEnumerable<Token> Scan(IEnumerable<char> source)
{
State current = StatesTable.InitialState;
int position = 0;
bool @continue = false;
var currentValue = new StringBuilder();
char symbol = ' ';
Func<Token> markPartialStop = () =>
{
if (current.IsStop)
{
var result = new Token(current.ResultingTokenId,
currentValue.ToString());
current = StatesTable.InitialState;
currentValue.Clear();
return result;
}
else
throw new ArgumentException(
string.Format(
"Invalid source (construction {0}; symbol '{1}' pos {2})",
currentValue, (@continue ? symbol.ToString() : "EOP"),
position),
"source");
};
using (IEnumerator<char> enumerator = source.GetEnumerator())
{
@continue = enumerator.MoveNext();
while (@continue)
{
symbol = @enumerator.Current;
if (current.Accepts(symbol))
{
current = StatesTable.Accept(current.ChangeTo(symbol));
currentValue.Append(symbol);
@continue = enumerator.MoveNext();
position++;
}
else
yield return markPartialStop();
}
}
yield return markPartialStop();
}
public IEnumerable<Token> Scan(IEnumerable<char> source)
{
State[] current = {StatesTable.InitialState};
var position = 0;
var @continue = false;
var currentValue = new StringBuilder();
var symbol = ' ';
Func<Token> markPartialStop = () =>
{
if (current[0].IsStop)
{
var result = new Token(current[0].ResultingTokenId,
currentValue.ToString());
current[0] = StatesTable.InitialState;
currentValue.Clear();
return result;
}
else
throw new ArgumentException(
$"Invalid source (construction {currentValue}; symbol '{(@continue ? symbol.ToString() : "EOP")}' pos {position})",
nameof(source));
};
using (var enumerator = source.GetEnumerator())
{
@continue = enumerator.MoveNext();
while (@continue)
{
symbol = @enumerator.Current;
if (current[0].Accepts(symbol))
{
current[0] = StatesTable.Accept(current[0].ChangeTo(symbol));
currentValue.Append(symbol);
@continue = enumerator.MoveNext();
position++;
}
else
yield return markPartialStop();
}
}
yield return markPartialStop();
}
internal UnexpectedTokenException(Token unexpected)
: base($"Unexpected token {unexpected}")
{
}
private void Match(string tokenType)
{
if (_inputToken.Id == tokenType)
{
Begin(_inputToken.ToString());
_inputToken = GetNextToken();
End();
}
else
throw new UnexpectedTokenException(_inputToken);
}
internal UnexpectedTokenException(Token unexpected)
: base(string.Format("Unexpected token {0}", unexpected))
{
}
private void Match(string tokenType)
{
if (inputTokenField.Id == tokenType)
{
Begin(inputTokenField.ToString());
inputTokenField = GetNextToken();
End();
}
else
throw new UnexpectedTokenException(inputTokenField);
}
