private static IStep ParseStep(LineReader reader, IStep previousStep)
{
var stepTitle = reader.CurrentLineTrimmed;
if (reader.IsGivenLine)
{
return(ParseStep(reader, (table, multiLineString) => new GivenStep(stepTitle, table, multiLineString)));
}
if (reader.IsWhenLine)
{
return(ParseStep(reader, (table, multiLineString) => new WhenStep(stepTitle, table, multiLineString)));
}
if (reader.IsThenLine)
{
return(ParseStep(reader, (table, multiLineString) => new ThenStep(stepTitle, table, multiLineString)));
}
if (!reader.IsAndLine && !reader.IsButLine)
{
throw new NotSupportedException(
$"Unrecognised step type in line '{reader.CurrentLineTrimmed}'.");
}
if (previousStep == null)
{
throw new InvalidGherkinSyntaxException(
$"The first step in a scenario cannot start with 'And'. Expected Given, When or Then", reader.CurrentLineNumber);
}
return(ParseStep(reader, (table, multiLineString) => previousStep.CreateAnother(stepTitle, table, multiLineString)));
}