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Add support for negative array indexes #777

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Add support for negative array indexes #777

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5 changes: 4 additions & 1 deletion value.go
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Original file line number Diff line number Diff line change
Expand Up @@ -294,7 +294,10 @@ func (arr *valueArray) index(i *interpreter, index int) (value, error) {
if 0 <= index && index < arr.length() {
return i.evaluatePV(arr.elements[index])
}
return nil, i.Error(fmt.Sprintf("Index %d out of bounds, not within [0, %v)", index, arr.length()))
if -arr.length() <= index && index < 0 {
return i.evaluatePV(arr.elements[index + arr.length()])
}
return nil, i.Error(fmt.Sprintf("Index %d out of bounds, not within [%v, %v)", index, -arr.length(), arr.length()))
}

func (arr *valueArray) length() int {
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