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Fix panic on reverse of empty linestrings #163

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Merged
merged 1 commit into from
Sep 6, 2025
Merged

Fix panic on reverse of empty linestrings #163

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5 changes: 5 additions & 0 deletions line_string.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,11 @@ func (ls LineString) Dimensions() int {
// This is done inplace, ie. it modifies the original data.
func (ls LineString) Reverse() {
l := len(ls) - 1

if l < 1 {
return
}

for i := 0; i <= l/2; i++ {
ls[i], ls[l-i] = ls[l-i], ls[i]
}
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10 changes: 10 additions & 0 deletions line_string_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,16 @@ func TestLineStringReverse(t *testing.T) {
input LineString
output LineString
}{
{
name: "0 point line",
input: LineString{},
output: LineString{},
},
{
name: "1 point line",
input: LineString{{1, 2}},
output: LineString{{1, 2}},
},
{
name: "2 point line",
input: LineString{{1, 2}, {3, 4}},
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