private IParseResult <ExpressionMetaData> TryGetConcatenationExpression(ITokenStream tokenStream, out IExpression expression)
{
expression = null;
var concatExpression = new ConcatenationExpression(_random);
var elementaryExpressionResult = TryGetElementaryExpression(tokenStream, out var elementaryExpression);
if (!elementaryExpressionResult.IsSuccess)
{
return(elementaryExpressionResult);
}
var metaData = elementaryExpressionResult.Value;
elementaryExpression.RepeatRange = GetRepeatConcatenationInterval(tokenStream);
concatExpression.Append(elementaryExpression);
var result = TryGetElementaryExpression(tokenStream, out elementaryExpression);
while (result.IsSuccess)
{
metaData.UpdateWith(result.Value);
elementaryExpression.RepeatRange = GetRepeatConcatenationInterval(tokenStream);
concatExpression.Append(elementaryExpression);
result = TryGetElementaryExpression(tokenStream, out elementaryExpression);
}
if (result.ErrorType != RegSeedErrorType.None)
{
return(result);
}
expression = concatExpression;
return(new SuccessParseResult <ExpressionMetaData>(tokenStream.CurrentPosition, metaData));
}
public override IExpression Clone()
{
var clone = new ConcatenationExpression(_random)
{
RepeatRange = RepeatRange?.Clone(),
ExpansionLength = ExpansionLength
};
clone.AppendRange(_elementaryExpressions.Select(x => x.Clone()));
return(clone);
}
private ConcatenationExpression GetInverseOfExpandedConcatForPosition(List <IExpression> expandedConcatRepresentation, int i)
{
var predecessorRange = expandedConcatRepresentation.GetRange(0, i);
var inverse = expandedConcatRepresentation[i].GetInverse();
var successorRange = expandedConcatRepresentation.GetRange(i + 1, expandedConcatRepresentation.Count - i - 1);
var concatExpression = new ConcatenationExpression(_random);
concatExpression.AppendRange(predecessorRange)
.Append(inverse)
.AppendRange(successorRange);
return(concatExpression);
}
