(depth int, funcTok lex.Token)
| 655 | } |
| 656 | |
| 657 | func (t *tree) Func(depth int, funcTok lex.Token) (fn *FuncNode) { |
| 658 | debugf(depth, "Func: tok: %v cur:%v peek:%v", funcTok.V, t.Cur(), t.Peek()) |
| 659 | if t.Cur().T != lex.TokenLeftParenthesis { |
| 660 | t.unexpected(t.Cur(), "must have left paren on function") |
| 661 | } |
| 662 | var node Node |
| 663 | var tok lex.Token |
| 664 | |
| 665 | funcImpl, ok := t.getFunction(funcTok.V) |
| 666 | if !ok { |
| 667 | if t.funcCheck { |
| 668 | t.errorf("non existent function %s", funcTok.V) |
| 669 | } else { |
| 670 | // if we aren't testing for validity, make a "fake" func |
| 671 | // we may not be using vm, just ast |
| 672 | //u.Warnf("non func? %v", funcTok.V) |
| 673 | funcImpl = Func{Name: funcTok.V, Eval: EmptyEvalFunc} |
| 674 | } |
| 675 | } |
| 676 | fn = NewFuncNode(funcTok.V, funcImpl) |
| 677 | fn.Missing = !ok |
| 678 | |
| 679 | t.expect(lex.TokenLeftParenthesis, "func") |
| 680 | t.Next() // Are we sure we consume? |
| 681 | |
| 682 | defer func() { |
| 683 | if err := fn.Validate(); err != nil { |
| 684 | t.error(err) // will panic |
| 685 | } |
| 686 | }() |
| 687 | |
| 688 | switch { |
| 689 | // Ugh, we need a way of identifying which functions get this special |
| 690 | // parser? |
| 691 | case t.Peek().T == lex.TokenAs && strings.ToLower(fn.Name) == "cast": |
| 692 | // We are not in a comma style function |
| 693 | // CAST(<expression> AS <identity>) |
| 694 | |
| 695 | node = t.O(depth + 1) |
| 696 | if node != nil { |
| 697 | fn.append(node) |
| 698 | } |
| 699 | if t.Cur().T != lex.TokenAs { |
| 700 | t.unexpected(t.Cur(), "func AS") |
| 701 | } |
| 702 | // This really isn't correct, we probably need an OperatorNode? |
| 703 | fn.append(NewStringNodeToken(t.Next())) |
| 704 | if t.Cur().T != lex.TokenIdentity { |
| 705 | t.unexpected(t.Cur(), "func AS exected Identity") |
| 706 | } |
| 707 | fn.append(NewStringNodeToken(t.Next())) |
| 708 | return fn |
| 709 | default: |
| 710 | lastComma := false |
| 711 | for { |
| 712 | node = nil |
| 713 | |
| 714 | switch firstToken := t.Cur(); firstToken.T { |
no test coverage detected