private async Task <List <ParsedInput> > ParseInput(string inputText, IRequestContext context, CancellationToken cancellationToken)
{
_synchronizationToken.Increment();
try
{
var parsedInputs = new List <ParsedInput>();
var processedInputText = inputText;
var textPreprocessors = _textPreprocessors.OrderBy(p => p.Priority);
foreach (var preprocessor in textPreprocessors)
{
cancellationToken.ThrowIfCancellationRequested();
processedInputText =
await
preprocessor.ProcessTextAsync(processedInputText, context, cancellationToken)
.ConfigureAwait(false);
}
var textCursor = new TextCursor(processedInputText, context);
foreach (var commandProcessor in _commandProcessors)
{
// Gets all the syntaxes that are of the same culture of the context or are culture invariant
var syntaxes =
commandProcessor.Syntaxes.Where(
s => s.Culture.Equals(context.Culture) || s.Culture.Equals(CultureInfo.InvariantCulture));
foreach (var syntax in syntaxes)
{
cancellationToken.ThrowIfCancellationRequested();
textCursor.RightToLeftParsing = syntax.RightToLeftParsing;
textCursor.Reset();
Expression expression;
if (SyntaxParser.TryParse(textCursor, syntax, context, out expression))
{
var commandParsedQuery = new ParsedInput(expression, commandProcessor);
parsedInputs.Add(commandParsedQuery);
break;
}
}
}
return(parsedInputs);
}
finally
{
_synchronizationToken.Decrement();
}
}
