Function extractIterVars

ext/comprehensions.go:401–420

(mef cel.MacroExprFactory, arg0, arg1 ast.Expr)

}

func extractIterVars(mef cel.MacroExprFactory, arg0, arg1 ast.Expr) (string, string, *cel.Error) {
	iterVar1, err := extractIterVar(mef, arg0)
	if err != nil {
		return "", "", err
	}
	iterVar2, err := extractIterVar(mef, arg1)
	if err != nil {
		return "", "", err
	}
	if iterVar1 == iterVar2 {
		return "", "", mef.NewError(arg1.ID(), fmt.Sprintf("duplicate variable name: %s", iterVar1))
	}
	if iterVar1 == mef.AccuIdentName() || iterVar1 == parser.AccumulatorName {
		return "", "", mef.NewError(arg0.ID(), "iteration variable overwrites accumulator variable")
	}
	if iterVar2 == mef.AccuIdentName() || iterVar2 == parser.AccumulatorName {
		return "", "", mef.NewError(arg1.ID(), "iteration variable overwrites accumulator variable")
	}
	return iterVar1, iterVar2, nil
}

func extractIterVar(mef cel.MacroExprFactory, target ast.Expr) (string, *cel.Error) {
	iterVar, found := extractIdent(target)