aparoksha/levenshtein-transformations
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Fix crashing when source or target array empty

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This commit is contained in:
david-swift 2024-01-01 12:29:34 +01:00
parent cfaa94f08e
commit a88dee4c4b
1 changed files with 20 additions and 17 deletions
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5
Sources/LevenshteinTransformations/LevenshteinTransformations.swift
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@ -80,6 +80,7 @@ enum LevenshteinTransformations {
operations[0][targetIndex] = .insert operations[0][targetIndex] = .insert
} }
if sourceCount > 0 && targetCount > 0 {
for sourceIndex in 1...sourceCount { for sourceIndex in 1...sourceCount {
for targetIndex in 1...targetCount { for targetIndex in 1...targetCount {
if source[sourceIndex - 1] == target[targetIndex - 1] { if source[sourceIndex - 1] == target[targetIndex - 1] {
@ -91,7 +92,8 @@ enum LevenshteinTransformations {
editDistances[sourceIndex - 1][targetIndex], editDistances[sourceIndex - 1][targetIndex],
editDistances[sourceIndex][targetIndex - 1] editDistances[sourceIndex][targetIndex - 1]
) )
if editDistances[sourceIndex][targetIndex] == editDistances[sourceIndex - 1][targetIndex - 1] + 1 { if editDistances[sourceIndex][targetIndex]
== editDistances[sourceIndex - 1][targetIndex - 1] + 1 {
operations[sourceIndex][targetIndex] = .replace operations[sourceIndex][targetIndex] = .replace
} else if editDistances[sourceIndex][targetIndex] } else if editDistances[sourceIndex][targetIndex]
== editDistances[sourceIndex - 1][targetIndex] + 1 { == editDistances[sourceIndex - 1][targetIndex] + 1 {
@ -103,6 +105,7 @@ enum LevenshteinTransformations {
} }
} }
} }
}
/// The transformation function for arrays with identifiable elements. /// The transformation function for arrays with identifiable elements.
/// - Parameters: /// - Parameters: