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Use math.Copysign for unary negation

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Robert Krimen 2013-02-22 11:49:41 -08:00
parent a24b29ebfe
commit ed8569f1ad
1 changed files with 5 additions and 6 deletions
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11
evaluate_expression.go
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@ -77,13 +77,12 @@ func (self *_runtime) evaluateUnaryOperation(node *_unaryOperationNode) Value {
return toValue(targetValue.toFloat()) return toValue(targetValue.toFloat())
case "-": case "-":
value := targetValue.toFloat() value := targetValue.toFloat()
if value == 0 { // TODO Test this
if math.Signbit(value) { sign := float64(-1)
return positiveZeroValue() if math.Signbit(value) {
} sign = 1
return negativeZeroValue()
} }
return toValue(-value) return toValue(math.Copysign(value, sign))
case "++=": // Prefix ++ case "++=": // Prefix ++
resultValue := toValue(+1 + targetValue.toFloat()) resultValue := toValue(+1 + targetValue.toFloat())
self.PutValue(target.reference(), resultValue) self.PutValue(target.reference(), resultValue)