mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-29 17:12:07 -05:00
e393c6290e
This error was introduced in 0.56 and has shown some site breakage in the wild. Fixes #6121
94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
// Copyright 2019 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/spf13/cast"
|
|
)
|
|
|
|
// GetNestedParam gets the first match of the keyStr in the candidates given.
|
|
// It will first try the exact match and then try to find it as a nested map value,
|
|
// using the given separator, e.g. "mymap.name".
|
|
// It assumes that all the maps given have lower cased keys.
|
|
func GetNestedParam(keyStr, separator string, candidates ...map[string]interface{}) (interface{}, error) {
|
|
keyStr = strings.ToLower(keyStr)
|
|
|
|
lookupFn := func(key string) interface{} {
|
|
for _, m := range candidates {
|
|
if v, ok := m[key]; ok {
|
|
return v
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
v, _, _, err := GetNestedParamFn(keyStr, separator, lookupFn)
|
|
return v, err
|
|
}
|
|
|
|
func GetNestedParamFn(keyStr, separator string, lookupFn func(key string) interface{}) (interface{}, string, map[string]interface{}, error) {
|
|
result, _ := traverseDirectParams(keyStr, lookupFn)
|
|
if result != nil {
|
|
return result, keyStr, nil, nil
|
|
}
|
|
|
|
keySegments := strings.Split(keyStr, separator)
|
|
if len(keySegments) == 1 {
|
|
return nil, keyStr, nil, nil
|
|
}
|
|
|
|
return traverseNestedParams(keySegments, lookupFn)
|
|
}
|
|
|
|
func traverseDirectParams(keyStr string, lookupFn func(key string) interface{}) (interface{}, error) {
|
|
return lookupFn(keyStr), nil
|
|
}
|
|
|
|
func traverseNestedParams(keySegments []string, lookupFn func(key string) interface{}) (interface{}, string, map[string]interface{}, error) {
|
|
firstKey, rest := keySegments[0], keySegments[1:]
|
|
result := lookupFn(firstKey)
|
|
if result == nil || len(rest) == 0 {
|
|
return result, firstKey, nil, nil
|
|
}
|
|
|
|
switch m := result.(type) {
|
|
case map[string]interface{}:
|
|
v, key, owner := traverseParams(rest, m)
|
|
return v, key, owner, nil
|
|
default:
|
|
return nil, "", nil, nil
|
|
}
|
|
}
|
|
|
|
func traverseParams(keys []string, m map[string]interface{}) (interface{}, string, map[string]interface{}) {
|
|
// Shift first element off.
|
|
firstKey, rest := keys[0], keys[1:]
|
|
result := m[firstKey]
|
|
|
|
// No point in continuing here.
|
|
if result == nil {
|
|
return result, "", nil
|
|
}
|
|
|
|
if len(rest) == 0 {
|
|
// That was the last key.
|
|
return result, firstKey, m
|
|
}
|
|
|
|
// That was not the last key.
|
|
return traverseParams(rest, cast.ToStringMap(result))
|
|
}
|