RusticToken CaptureValueOrLeftOperator(string expression, ref int index)
{
RusticToken result = TryCaptureValueOrLeftOperator(expression, ref index, canEndGroups: false);
if (result == null)
{
throw new Exception("Unexpected token: " + unexpectedTokenExpr.Match(expression, index));
}
return(result);
}
public void PutToken(RusticToken token)
{
switch (token.mode)
{
case RusticTokenMode.Literal: PutValueToken(token.value); break;
case RusticTokenMode.VariableName: PutVariableToken(token.value.ToString()); break;
case RusticTokenMode.Operation: PutOperationToken((RusticOperation)token.value); break;
case RusticTokenMode.PriorityOffset: ChangePriority((int)token.value); break;
default: throw new NotImplementedException();
}
}
public IEnumerable <RusticToken> GetTokenList(string expression)
{
if (initialized == false)
{
Initialize();
}
int index = 0;
expression.Trim();
currentState.Clear();
currentState.Push(ParsingState.ValueOrLeftOperatorOrEnd);
while (currentState.Count > 0)
{
TryCaptureIgnoredPattern(expression, ref index);
RusticToken result = null;
switch (currentState.Pop())
{
case ParsingState.ValueOrLeftOperatorOrEnd: result = TryCaptureValueOrLeftOperator(expression, ref index); break;
case ParsingState.ValueOrLeftOperatorExpected: result = CaptureValueOrLeftOperator(expression, ref index); break;
case ParsingState.MiddleOperatorOrEnd: result = TryCaptureMiddleOperator(expression, ref index); break;
}
if (result != null)
{
yield return(result);
}
}
TryCaptureIgnoredPattern(expression, ref index);
if (index < expression.Length)
{
throw new Exception($"Unexpected sequence of characters: {expression.Substring(index)}");
}
}