Function estimateStringVariableTransformCost

ext/strings.go:914–921

estimateStringVariableTransformCost estimates cost for O(n) string operations that result in a variable sized string which may be empty to the exact input string.

(estimator checker.CostEstimator, target *checker.AstNode, args []checker.AstNode)

// estimateStringVariableTransformCost estimates cost for O(n) string operations that result
// in a variable sized string which may be empty to the exact input string.
func estimateStringVariableTransformCost(estimator checker.CostEstimator, target *checker.AstNode, args []checker.AstNode) *checker.CallEstimate {
	if target == nil {
		return nil
	}
	cost, size := estimateStringScan(estimateSize(estimator, *target))
	transformSize := rangedSizeEstimate(0, size.Max)
	return callEstimate(cost.Add(callCostEstimate).Add(transformSize.AsCost()), &transformSize)
}

// estimateStringCharAtCost includes a cost of 1 for the allocation, plus the string traversal cost.
func estimateStringCharAtCost(estimator checker.CostEstimator, target *checker.AstNode, args []checker.AstNode) *checker.CallEstimate {