github.com/olliephillips/hugo@v0.42.2/common/maps/maps.go (about)

     1  // Copyright 2018 The Hugo Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package maps
    15  
    16  import (
    17  	"strings"
    18  
    19  	"github.com/spf13/cast"
    20  )
    21  
    22  // ToLower makes all the keys in the given map lower cased and will do so
    23  // recursively.
    24  // Notes:
    25  // * This will modify the map given.
    26  // * Any nested map[interface{}]interface{} will be converted to map[string]interface{}.
    27  func ToLower(m map[string]interface{}) {
    28  	for k, v := range m {
    29  		switch v.(type) {
    30  		case map[interface{}]interface{}:
    31  			v = cast.ToStringMap(v)
    32  			ToLower(v.(map[string]interface{}))
    33  		case map[string]interface{}:
    34  			ToLower(v.(map[string]interface{}))
    35  		}
    36  
    37  		lKey := strings.ToLower(k)
    38  		if k != lKey {
    39  			delete(m, k)
    40  			m[lKey] = v
    41  		}
    42  
    43  	}
    44  }