Struct folder

interpreter/interpretable.go:1539–1553

folder tracks the state associated with folding a list or map with a comprehension v2 style macro. The folder embeds an interpreter.Activation and Interpretable evalFold value as well as implements the traits.Folder interface methods. Instances of a folder are intended to be pooled to minimize all

// in preserving evaluation order semantics which might otherwise be disrupted through the use of
// cel.bind or cel.@block.
type folder struct {
	*evalFold
	frame *ExecutionFrame

	// fold state objects.
	accuVal     ref.Val
	iterVar1Val any
	iterVar2Val any

	// bookkeeping flags to modify Activation and fold behaviors.
	initialized   bool
	mutableValue  bool
	interrupted   bool
	computeResult bool
}

func (f *folder) foldIterable(iterable traits.Iterable) ref.Val {
	it := iterable.Iterator()