c4b97fadcc
It turns out that some planned additions to the parser make it so that the map type definition can be ambiguous. As a result, this patch updates the definition so that the map definition is not confused with an open curly bracket anywhere. Thanks to pestle and stbenjamin for their help understanding yacc!
58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
// Mgmt
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// Copyright (C) 2013-2018+ 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 <http://www.gnu.org/licenses/>.
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package simplepoly // TODO: should this be in its own individual package?
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import (
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"fmt"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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Register("len", []*types.FuncValue{
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{
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T: types.NewType("func([]variant) int"),
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V: Len,
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},
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{
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T: types.NewType("func(map{variant: variant}) int"),
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V: Len,
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},
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// TODO: should we add support for struct or func lengths?
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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(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.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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