protected void ExpectToken(string token)
{
if (CurrentToken.ToLower() != token.ToLower())
{
throw new ExpectedTokenNotFoundException(token, CurrentToken, Tokenizer.Position);
}
ReadNextToken();
}
/// <inheritdoc />
public override void ParseModifiers()
{
var tok = CurrentToken.ToLower();
if (tok == "not" || tok == "non" || tok == "never")
{
IsNegated = true;
SkipToken();
if (!EndOfInput && CurrentToken == "-")
{
SkipToken();
}
}
}
protected void ExpectToken(string token)
{
var current = Tokenizer.Current;
if (current == Token.Null || CurrentToken.ToLower() != token.ToLower())
{
throw new ExpectedTokenNotFoundException(
token,
current != Token.Null ? current.ToString() : "EOF",
Tokenizer.Position
);
}
ReadNextToken();
}
/// <summary>
/// Attempt to match tokens to a complex NP, including modifiers.
/// If successful, this sets Modifiers and CommonNoun directly.
/// Will fail phrase includes an unknown noun or adjective.
/// </summary>
/// <returns>True on success</returns>
// ReSharper disable once InconsistentNaming
private bool ScanComplexNP()
{
Debug.Assert(CachedConcept == null);
var beginning = State;
MonadicConcept nextConcept;
MonadicConceptLiteral last = null;
Modifiers.Clear();
do
{
var isPositive = true;
if (EndOfInput)
{
break;
}
var tok = CurrentToken.ToLower();
if (tok == "not" || tok == "non")
{
isPositive = false;
SkipToken();
if (EndOfInput)
{
return(false);
}
if (CurrentToken == "-")
{
SkipToken();
}
}
nextConcept = Parser.MatchTrie(Ontology.MonadicConceptTrie);
if (nextConcept != null)
{
var next = new MonadicConceptLiteral(nextConcept, isPositive);
if (last != null)
{
Modifiers.Add(last);
}
last = next;
if (!EndOfInput && !ElementOfList && CurrentToken == ",")
{
SkipToken();
}
}
} while (nextConcept != null);
if (last?.Concept is Noun n)
{
CachedConcept = n;
if (!Number.HasValue)
{
// Only update if Number wasn't already set by a determiner.
// This is to get around nouns that are their own plurals.
Number = Ontology.LastMatchPlural ? Parser.Number.Plural : Parser.Number.Singular;
}
RelativeFrequency = Parser.ParseRelativeFrequency();
SetText(beginning);
return(true);
}
ResetTo(beginning);
return(false);
}