public static DisjunctiveExamplesSpec WitnessRegexPair(GrammarRule rule,
DisjunctiveExamplesSpec spec)
{
var rrExamples = new Dictionary <State, IEnumerable <object> >();
foreach (State input in spec.ProvidedInputs)
{
var v = (StringRegion)input[rule.Body[0]];
var regexes = new List <Tuple <RegularExpression, RegularExpression> >();
foreach (uint pos in spec.DisjunctiveExamples[input])
{
MultiValueDictionary <Token, TokenMatch> rightMatches;
if (!v.Cache.TryGetAllMatchesStartingAt(pos, out rightMatches))
{
continue;
}
MultiValueDictionary <Token, TokenMatch> leftMatches;
if (!v.Cache.TryGetAllMatchesEndingAt(pos, out leftMatches))
{
continue;
}
var leftRegexes =
leftMatches.Keys.Select(t => RegularExpression.Create(new[] { t }))
.Append(Epsilon);
var rightRegexes =
rightMatches.Keys.Select(t => RegularExpression.Create(new[] { t }))
.Append(Epsilon);
var regexPairs = from l in leftRegexes
from r in rightRegexes
select Tuple.Create(l, r);
regexes.AddRange(regexPairs);
}
rrExamples[input] = regexes;
}
return(DisjunctiveExamplesSpec.From(rrExamples));
}