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https://github.com/gohugoio/hugo.git
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420c9e4d3d
The variable scope in the Go templates makes it hard, if possible at all, to write templates with counter variables or similar state. This commit fixes that by adding a writable context to Node, backed by a map: Scratch. This context has three methods, Get, Set and Add. The Add is tailored for counter variables, but can be used for any built-in numeric values or strings.
58 lines
1.7 KiB
Go
58 lines
1.7 KiB
Go
// Copyright © 2013-14 Steve Francia <spf@spf13.com>.
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//
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// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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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)
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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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}
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// Add will 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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func (c *Scratch) Add(key string, newAddend interface{}) (string, error) {
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var newVal interface{}
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existingAddend, found := c.values[key]
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if found {
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var err error
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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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} else {
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newVal = newAddend
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}
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c.values[key] = newVal
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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.values[key] = value
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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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return c.values[key]
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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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