Method FromExpr

expr/node.go:608–642

(e *Expr)

	return fe
}
func (m *FuncNode) FromExpr(e *Expr) error {
	if e.Op != lex.TokenUdfExpr.String() {
		return fmt.Errorf("Expected 'expr' but got %v", e.Op)
	}
	if len(e.Args) < 1 {
		return fmt.Errorf("Expected function name in args but got none")
	}

	m.Name = e.Args[0].Identity

	if len(e.Args) > 1 {
		args, err := NodesFromExprs(e.Args[1:])
		if err != nil {
			return err
		}
		m.Args = args
	}
	s := m.String()
	n, err := ParseExpression(s)
	if err != nil {
		return fmt.Errorf("Could not round-trip parse func:  %s  err=%v", s, err)
	}
	fn, ok := n.(*FuncNode)
	if !ok {
		return fmt.Errorf("Expected funcnode but got %T", n)
	}
	m.F = fn.F
	if err = fn.Validate(); err != nil {
		return err
	}
	if m.Eval == nil {
		m.Eval = fn.Eval
	}
	return nil
}
func (m *FuncNode) Equal(n Node) bool {
	if m == nil && n == nil {
		return true