98 lines
3.1 KiB
Go
98 lines
3.1 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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package core
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import (
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"context"
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"fmt"
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"github.com/purpleidea/mgmt/lang/funcs/simple"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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simple.Register("len", &simple.Scaffold{
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T: types.NewType("func(?1) int"),
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// TODO: should we add support for struct or func lengths?
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C: simple.TypeMatch([]string{
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"func(str) int",
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"func([]?1) int",
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"func(map{?1: ?2}) int",
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}),
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//C: func(typ *types.Type) error {
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// if typ == nil {
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// return fmt.Errorf("nil type")
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// }
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// if typ.Kind != types.KindFunc {
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// return fmt.Errorf("not a func")
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// }
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// if len(typ.Map) != 1 || len(typ.Ord) != 1 {
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// return fmt.Errorf("arg count wrong")
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// }
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// if err := typ.Out.Cmp(types.TypeInt); err != nil {
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// return err
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// }
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// t := typ.Map[typ.Ord[0]]
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// if t.Cmp(types.TypeStr) == nil {
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// return nil // func(str) int
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// }
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// if t.Kind == types.KindList {
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// return nil // func([]?1) int
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// }
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// if t.Kind == types.KindMap {
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// return nil // func(map{?1: ?2}) int
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// }
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// return fmt.Errorf("can't determine length of %s", t)
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//},
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F: Len,
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})
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}
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// Len returns the number of elements in a list or the number of key pairs in a
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// map. It can operate on either of these types.
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func Len(ctx context.Context, input []types.Value) (types.Value, error) {
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var length int
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switch k := input[0].Type().Kind; k {
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case types.KindStr:
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length = len(input[0].Str())
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case types.KindList:
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length = len(input[0].List())
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case types.KindMap:
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length = len(input[0].Map())
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default:
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return nil, fmt.Errorf("unsupported kind: %+v", k)
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}
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return &types.IntValue{
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V: int64(length),
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}, nil
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}
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