mirror of https://github.com/gohugoio/hugo.git
99 lines
2.5 KiB
Go
99 lines
2.5 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 collections
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import (
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"reflect"
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"strings"
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"github.com/gohugoio/hugo/common/hreflect"
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"github.com/pkg/errors"
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)
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// Merge creates a copy of dst and merges src into it.
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// Currently only maps supported. Key handling is case insensitive.
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func (ns *Namespace) Merge(src, dst interface{}) (interface{}, error) {
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vdst, vsrc := reflect.ValueOf(dst), reflect.ValueOf(src)
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if vdst.Kind() != reflect.Map {
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return nil, errors.Errorf("destination must be a map, got %T", dst)
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}
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if !hreflect.IsTruthfulValue(vsrc) {
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return dst, nil
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}
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if vsrc.Kind() != reflect.Map {
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return nil, errors.Errorf("source must be a map, got %T", src)
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}
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if vsrc.Type() != vdst.Type() {
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return nil, errors.Errorf("incompatible map types, got %T to %T", src, dst)
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}
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return mergeMap(vdst, vsrc).Interface(), nil
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}
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func caseInsensitiveLookup(m, k reflect.Value) (reflect.Value, bool) {
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if m.Type().Key().Kind() != reflect.String || k.Kind() != reflect.String {
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// Fall back to direct lookup.
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v := m.MapIndex(k)
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return v, hreflect.IsTruthfulValue(v)
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}
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for _, key := range m.MapKeys() {
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if strings.EqualFold(k.String(), key.String()) {
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return m.MapIndex(key), true
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}
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}
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return reflect.Value{}, false
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}
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func mergeMap(dst, src reflect.Value) reflect.Value {
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out := reflect.MakeMap(dst.Type())
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// Copy the destination map.
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for _, key := range dst.MapKeys() {
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v := dst.MapIndex(key)
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out.SetMapIndex(key, v)
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}
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// Add all keys in src not already in destination.
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// Maps of the same type will be merged.
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for _, key := range src.MapKeys() {
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sv := src.MapIndex(key)
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dv, found := caseInsensitiveLookup(dst, key)
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if found {
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// If both are the same map type, merge.
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dve := dv.Elem()
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if dve.Kind() == reflect.Map {
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sve := sv.Elem()
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if dve.Type() == sve.Type() {
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out.SetMapIndex(key, mergeMap(dve, sve))
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}
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}
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} else {
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out.SetMapIndex(key, sv)
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}
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}
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return out
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}
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