Function ExistsOneMacroExpander

cel/macro.go:246–256

ExistsOneMacroExpander expands the input call arguments into a comprehension that returns true if exactly one of the elements in the range match the predicate expressions: .exists_one( , )

(meh MacroExprHelper, target *exprpb.Expr, args []*exprpb.Expr)

// one of the elements in the range match the predicate expressions:
// <iterRange>.exists_one(<iterVar>, <predicate>)
func ExistsOneMacroExpander(meh MacroExprHelper, target *exprpb.Expr, args []*exprpb.Expr) (*exprpb.Expr, *Error) {
	ph, err := toParserHelper(meh)
	if err != nil {
		return nil, err
	}
	out, err := parser.MakeExistsOne(ph, mustAdaptToExpr(target), mustAdaptToExprs(args))
	if err != nil {
		return nil, err
	}
	return adaptToProto(out)
}

// MapMacroExpander expands the input call arguments into a comprehension that transforms each element in the
// input to produce an output list.