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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package maps
import (
"strings"
"github.com/gobwas/glob"
"github.com/spf13/cast"
)
// ToLower makes all the keys in the given map lower cased and will do so
// recursively.
// Notes:
// * This will modify the map given.
// * Any nested map[interface{}]interface{} will be converted to map[string]interface{}.
func ToLower(m map[string]interface{}) {
for k, v := range m {
switch v.(type) {
case map[interface{}]interface{}:
v = cast.ToStringMap(v)
ToLower(v.(map[string]interface{}))
case map[string]interface{}:
ToLower(v.(map[string]interface{}))
}
lKey := strings.ToLower(k)
if k != lKey {
delete(m, k)
m[lKey] = v
}
}
}
type keyRename struct {
pattern glob.Glob
newKey string
}
// KeyRenamer supports renaming of keys in a map.
type KeyRenamer struct {
renames []keyRename
}
// NewKeyRenamer creates a new KeyRenamer given a list of pattern and new key
// value pairs.
func NewKeyRenamer(patternKeys ...string) (KeyRenamer, error) {
var renames []keyRename
for i := 0; i < len(patternKeys); i += 2 {
g, err := glob.Compile(strings.ToLower(patternKeys[i]), '/')
if err != nil {
return KeyRenamer{}, err
}
renames = append(renames, keyRename{pattern: g, newKey: patternKeys[i+1]})
}
return KeyRenamer{renames: renames}, nil
}
func (r KeyRenamer) getNewKey(keyPath string) string {
for _, matcher := range r.renames {
if matcher.pattern.Match(keyPath) {
return matcher.newKey
}
}
return ""
}
// Rename renames the keys in the given map according
// to the patterns in the current KeyRenamer.
func (r KeyRenamer) Rename(m map[string]interface{}) {
r.renamePath("", m)
}
func (KeyRenamer) keyPath(k1, k2 string) string {
k1, k2 = strings.ToLower(k1), strings.ToLower(k2)
if k1 == "" {
return k2
} else {
return k1 + "/" + k2
}
}
func (r KeyRenamer) renamePath(parentKeyPath string, m map[string]interface{}) {
for key, val := range m {
keyPath := r.keyPath(parentKeyPath, key)
switch val.(type) {
case map[interface{}]interface{}:
val = cast.ToStringMap(val)
r.renamePath(keyPath, val.(map[string]interface{}))
case map[string]interface{}:
r.renamePath(keyPath, val.(map[string]interface{}))
}
newKey := r.getNewKey(keyPath)
if newKey != "" {
delete(m, key)
m[newKey] = val
}
}
}
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