111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package maps
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import (
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"strings"
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"github.com/spf13/cast"
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)
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// Params is a map where all keys are lower case.
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type Params map[string]interface{}
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// Get does a lower case and nested search in this map.
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// It will return nil if none found.
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func (p Params) Get(indices ...string) interface{} {
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v, _, _ := getNested(p, indices)
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return v
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}
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func getNested(m map[string]interface{}, indices []string) (interface{}, string, map[string]interface{}) {
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if len(indices) == 0 {
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return nil, "", nil
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}
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first := indices[0]
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v, found := m[strings.ToLower(cast.ToString(first))]
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if !found {
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if len(indices) == 1 {
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return nil, first, m
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}
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return nil, "", nil
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}
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if len(indices) == 1 {
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return v, first, m
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}
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switch m2 := v.(type) {
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case Params:
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return getNested(m2, indices[1:])
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case map[string]interface{}:
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return getNested(m2, indices[1:])
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default:
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return nil, "", nil
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}
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}
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// GetNestedParam gets the first match of the keyStr in the candidates given.
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// It will first try the exact match and then try to find it as a nested map value,
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// using the given separator, e.g. "mymap.name".
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// It assumes that all the maps given have lower cased keys.
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func GetNestedParam(keyStr, separator string, candidates ...Params) (interface{}, error) {
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keyStr = strings.ToLower(keyStr)
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// Try exact match first
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for _, m := range candidates {
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if v, ok := m[keyStr]; ok {
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return v, nil
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}
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}
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keySegments := strings.Split(keyStr, separator)
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for _, m := range candidates {
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if v := m.Get(keySegments...); v != nil {
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return v, nil
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}
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}
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return nil, nil
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}
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func GetNestedParamFn(keyStr, separator string, lookupFn func(key string) interface{}) (interface{}, string, map[string]interface{}, error) {
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keySegments := strings.Split(keyStr, separator)
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if len(keySegments) == 0 {
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return nil, "", nil, nil
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}
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first := lookupFn(keySegments[0])
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if first == nil {
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return nil, "", nil, nil
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}
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if len(keySegments) == 1 {
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return first, keySegments[0], nil, nil
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}
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switch m := first.(type) {
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case map[string]interface{}:
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v, key, owner := getNested(m, keySegments[1:])
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return v, key, owner, nil
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case Params:
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v, key, owner := getNested(m, keySegments[1:])
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return v, key, owner, nil
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}
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return nil, "", nil, nil
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}
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