78 lines
2.8 KiB
Go
78 lines
2.8 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 types
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import (
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"fmt"
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"reflect"
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)
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// nextPowerOfTwo gets the lowest number higher than v that is a power of two.
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func nextPowerOfTwo(v uint) uint {
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v--
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v |= v >> 1
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v |= v >> 2
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v |= v >> 4
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v |= v >> 8
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v |= v >> 16
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v |= v >> 32
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v++
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return v
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}
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// TypeStructTagToFieldName returns a mapping from recommended alias to actual
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// field name. It returns an error if it finds a collision. It uses the `lang`
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// tags. It must be passed a reflect.Type representation of a struct or it will
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// error.
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// TODO: This is a copy of engineUtil.StructTagToFieldName taking a reflect.Type
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func TypeStructTagToFieldName(st reflect.Type) (map[string]string, error) {
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if k := st.Kind(); k != reflect.Struct { // this should be a struct now
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return nil, fmt.Errorf("input doesn't point to a struct, got: %+v", k)
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}
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result := make(map[string]string) // `lang` field tag -> field name
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for i := 0; i < st.NumField(); i++ {
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field := st.Field(i)
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name := field.Name
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// if !ok, then nothing is found
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if alias, ok := field.Tag.Lookup(StructTag); ok { // golang 1.7+
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if val, exists := result[alias]; exists {
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return nil, fmt.Errorf("field `%s` uses the same key `%s` as field `%s`", name, alias, val)
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}
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// empty string ("") is a valid value
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if alias != "" {
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result[alias] = name
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}
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}
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}
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return result, nil
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}
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