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Fix for LT-18767 Yellow crash foe XAmple-style redup pattern #313

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Fix for LT-18767 Yellow crash foe XAmple-style redup pattern #313

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8 changes: 8 additions & 0 deletions src/SIL.Machine.Morphology.HermitCrab/MorphologicalRules/CopyFromInput.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,14 @@ public override void GenerateAnalysisLhs(
IDictionary<string, int> capturedParts
)
{
if (!partLookup.ContainsKey(PartName))
// The key can be missing when using XAmple-style partial reduplication patterns
// and the environment does not have a matching indexed natural class.
// For example, [C^1][V^1][C^2][C^3] /[C^1][V^1][C^2]h_
// where there is no [C^3] in the environment.
// We skip it here. N.B. XAmple does not give any warning message about it, either.
// This fixes LT-18767.
return;
Pattern<Word, ShapeNode> pattern = partLookup[PartName];
int count = capturedParts.GetOrCreate(PartName, () => 0);
string groupName = AnalysisMorphologicalTransform.GetGroupName(PartName, count);
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