Function transformList

ext/comprehensions.go:298–331

(mef cel.MacroExprFactory, target ast.Expr, args []ast.Expr)

}

func transformList(mef cel.MacroExprFactory, target ast.Expr, args []ast.Expr) (ast.Expr, *cel.Error) {
	iterVar1, iterVar2, err := extractIterVars(mef, args[0], args[1])
	if err != nil {
		return nil, err
	}

	var transform ast.Expr
	var filter ast.Expr
	if len(args) == 4 {
		filter = args[2]
		transform = args[3]
	} else {
		filter = nil
		transform = args[2]
	}

	//  accumulator = accumulator + [transform]
	step := mef.NewCall(operators.Add, mef.NewAccuIdent(), mef.NewList(transform))
	if filter != nil {
		//  accumulator = (filter) ? accumulator + [transform] : accumulator
		step = mef.NewCall(operators.Conditional, filter, step, mef.NewAccuIdent())
	}

	return mef.NewComprehensionTwoVar(
		target,
		iterVar1,
		iterVar2,
		mef.AccuIdentName(),
		/*accuInit=*/ mef.NewList(),
		/*condition=*/ mef.NewLiteral(types.True),
		step,
		/*result=*/ mef.NewAccuIdent(),
	), nil
}

func transformMap(mef cel.MacroExprFactory, target ast.Expr, args []ast.Expr) (ast.Expr, *cel.Error) {
	iterVar1, iterVar2, err := extractIterVars(mef, args[0], args[1])