52897cc16c
Into() mutates a given reflect.Value and sets the data represented by the types.Value into the storage represented by the reflect.Value. Into() is the opposite to ValueOf() which converts reflect.Value into types.Value, and in theory they should be (almost) bijective with some edge case exceptions where the conversion is lossy. Simply, it replaces reflect.Value.Set() in the broad case, giving finer control of how the reflect.Value is modified and how the data is set. types.Value.Value() is now also a redundant function that achieves the same outcome as Into(), but with less type specificity. Signed-off-by: Joe Groocock <me@frebib.net>
65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
// Mgmt
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// Copyright (C) 2013-2021+ 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 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 uint32) uint32 {
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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++
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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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