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Fix: DiffLinesToChars hash error. #125

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Fix: DiffLinesToChars hash error. #125

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9 changes: 5 additions & 4 deletions diffmatchpatch/diff.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1312,18 +1312,19 @@ func (dmp *DiffMatchPatch) DiffFromDelta(text1 string, delta string) (diffs []Di
func (dmp *DiffMatchPatch) diffLinesToStrings(text1, text2 string) (string, string, []string) {
// '\x00' is a valid character, but various debuggers don't like it. So we'll insert a junk entry to avoid generating a null character.
lineArray := []string{""} // e.g. lineArray[4] == 'Hello\n'
lineHash := make(map[string]int)
lineHash[""] = 0

//Each string has the index of lineArray which it points to
strIndexArray1 := dmp.diffLinesToStringsMunge(text1, &lineArray)
strIndexArray2 := dmp.diffLinesToStringsMunge(text2, &lineArray)
strIndexArray1 := dmp.diffLinesToStringsMunge(text1, &lineArray, lineHash)
strIndexArray2 := dmp.diffLinesToStringsMunge(text2, &lineArray, lineHash)

return intArrayToString(strIndexArray1), intArrayToString(strIndexArray2), lineArray
}

// diffLinesToStringsMunge splits a text into an array of strings, and reduces the texts to a []string.
func (dmp *DiffMatchPatch) diffLinesToStringsMunge(text string, lineArray *[]string) []uint32 {
func (dmp *DiffMatchPatch) diffLinesToStringsMunge(text string, lineArray *[]string, lineHash map[string]int) []uint32 {
// Walk the text, pulling out a substring for each line. text.split('\n') would would temporarily double our memory footprint. Modifying text would create many large strings to garbage collect.
lineHash := map[string]int{} // e.g. lineHash['Hello\n'] == 4
lineStart := 0
lineEnd := -1
strs := []uint32{}
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