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https://github.com/gohugoio/hugo.git
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c846b051f3
It is a fairly costly operation: ``` benchmark old ns/op new ns/op delta BenchmarkScratchGet-4 109 31.6 -71.01% benchmark old allocs new allocs delta BenchmarkScratchGet-4 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkScratchGet-4 0 0 +0.00% ´´´
127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
// Copyright 2015 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 hugolib
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import (
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"github.com/spf13/hugo/helpers"
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"reflect"
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"sort"
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"sync"
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)
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// Scratch is a writable context used for stateful operations in Page/Node rendering.
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type Scratch struct {
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values map[string]interface{}
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mu sync.RWMutex
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}
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// Add will, for single values, add (using the + operator) the addend to the existing addend (if found).
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// Supports numeric values and strings.
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//
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// If the first add for a key is an array or slice, then the next value(s) will be appended.
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func (c *Scratch) Add(key string, newAddend interface{}) (string, error) {
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var newVal interface{}
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c.mu.RLock()
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existingAddend, found := c.values[key]
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c.mu.RUnlock()
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if found {
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var err error
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addendV := reflect.ValueOf(existingAddend)
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if addendV.Kind() == reflect.Slice || addendV.Kind() == reflect.Array {
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nav := reflect.ValueOf(newAddend)
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if nav.Kind() == reflect.Slice || nav.Kind() == reflect.Array {
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newVal = reflect.AppendSlice(addendV, nav).Interface()
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} else {
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newVal = reflect.Append(addendV, nav).Interface()
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}
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} else {
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newVal, err = helpers.DoArithmetic(existingAddend, newAddend, '+')
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if err != nil {
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return "", err
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}
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}
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} else {
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newVal = newAddend
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}
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c.mu.Lock()
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c.values[key] = newVal
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c.mu.Unlock()
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return "", nil // have to return something to make it work with the Go templates
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}
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// Set stores a value with the given key in the Node context.
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// This value can later be retrieved with Get.
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func (c *Scratch) Set(key string, value interface{}) string {
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c.mu.Lock()
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c.values[key] = value
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c.mu.Unlock()
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return ""
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}
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// Get returns a value previously set by Add or Set
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func (c *Scratch) Get(key string) interface{} {
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c.mu.RLock()
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val := c.values[key]
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c.mu.RUnlock()
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return val
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}
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// SetInMap stores a value to a map with the given key in the Node context.
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// This map can later be retrieved with GetSortedMapValues.
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func (c *Scratch) SetInMap(key string, mapKey string, value interface{}) string {
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c.mu.Lock()
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_, found := c.values[key]
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if !found {
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c.values[key] = make(map[string]interface{})
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}
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c.values[key].(map[string]interface{})[mapKey] = value
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c.mu.Unlock()
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return ""
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}
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// GetSortedMapValues returns a sorted map previously filled with SetInMap
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func (c *Scratch) GetSortedMapValues(key string) interface{} {
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c.mu.RLock()
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if c.values[key] == nil {
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c.mu.RUnlock()
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return nil
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}
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unsortedMap := c.values[key].(map[string]interface{})
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c.mu.RUnlock()
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var keys []string
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for mapKey := range unsortedMap {
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keys = append(keys, mapKey)
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}
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sort.Strings(keys)
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sortedArray := make([]interface{}, len(unsortedMap))
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for i, mapKey := range keys {
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sortedArray[i] = unsortedMap[mapKey]
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}
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return sortedArray
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}
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func newScratch() *Scratch {
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return &Scratch{values: make(map[string]interface{})}
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}
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