refactor: simplify implementation
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crimx
parent
90d06a9b0b
commit
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92
README.md
92
README.md
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@ -9,8 +9,6 @@ A Hexo plugin that adds emoji support, using [Github Emojis API][ghemojis].
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Check out the [Emoji Cheat Sheet](http://www.webpagefx.com/tools/emoji-cheat-sheet/) for all the emojis it supports.
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V2 is not compatible with [V1](https://github.com/crimx/hexo-filter-github-emojis/tree/e52ceb8b18a7b06916b6cb0a887b218d49a7ab92). V1 replaces codepoints with `<img>` tags. While V2 makes the font transparent and displays emojis with `background-image`.
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## Installation
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``` bash
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@ -30,43 +28,71 @@ githubEmojis:
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customEmojis:
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```
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- **className** - Image class name. For example :sparkles: `:sparkles:` the filter will generate something like this:
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- **enable** `boolean=true` - Enable `::` emoji parsing. If off the [tag](#tag) and [helper](#helper) still work.
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- **className** `string="github-emoji"` - Emoji class name.
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For example :sparkles: `:sparkles:` the filter will generate something like this:
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```html
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<span class="github-emoji" style="background-image:url(https://assets-cdn.github.com/images/icons/emoji/unicode/2728.png?v8)" data-src="https://assets-cdn.github.com/images/icons/emoji/unicode/2728.png?v8">✨</span>
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<span class="github-emoji"><span>✨</span><img src="https://assets-cdn.github.com/images/icons/emoji/unicode/2728.png?v8"></span>
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```
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- **inject** - If true, the filter will inject proper inline styles and a script to fallback when image loading fails. If you can modify script files and style files, you may turn this off and add them yourself.
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```html
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<span class="github-emoji" style="color:transparent;background:no-repeat url(...) center/contain" ...>
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```
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- **inject** `boolean=true` - Inject emoji styles and fallback script.
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If `true`, the filter will inject a `<style>` to document `<head>`.
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If `false`, the filter will not inject any style. If you can modify source style files you may turn this off and add them yourself.
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A script tag will be appended, the className changes according to the options:
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Below is the injected `<style>`. The class name changes according to option.
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```html
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<script>
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document.querySelectorAll('.github-emojis')
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.forEach(el => {
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if (!el.dataset.src) { return; }
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const img = document.createElement('img');
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img.style = 'display:none !important;';
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img.src = el.dataset.src;
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img.addEventListener('error', () => {
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img.remove();
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el.style.color = 'inherit';
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el.style.backgroundImage = 'none';
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el.style.background = 'none';
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});
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img.addEventListener('load', () => {
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img.remove();
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});
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document.body.appendChild(img);
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});
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</script>
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<style>
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.github-emoji {
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position: relative;
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display: inline-block;
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width: 1.2em;
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min-height: 1.2em;
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overflow: hidden;
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vertical-align: top;
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color: transparent;
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}
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.github-emoji > span {
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position: relative;
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z-index: 10;
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}
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.github-emoji img,
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.github-emoji .fancybox {
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margin: 0 !important;
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padding: 0 !important;
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border: none !important;
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outline: none !important;
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text-decoration: none !important;
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user-select: none !important;
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cursor: auto !important;
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}
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.github-emoji img {
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height: 1.2em !important;
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width: 1.2em !important;
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position: absolute !important;
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left: 50% !important;
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top: 50% !important;
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transform: translate(-50%, -50%) !important;
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user-select: none !important;
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cursor: auto !important;
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}
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.github-emoji-fallback {
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color: inherit;
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}
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.github-emoji-fallback img {
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opacity: 0 !important;
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}
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</style>
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```
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- **styles** - inline styles. For example:
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- **styles** `object={}` - inline styles. For example:
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```yaml
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githubEmojis:
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@ -78,10 +104,10 @@ githubEmojis:
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outputs:
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```html
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<span class="github-emoji" style="font-size:2em;font-weight:bold;background-image:url(...)" ...>
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<span class="github-emoji" style="font-size:2em;font-weight:bold" ...>
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```
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- **customEmojis** - You can specify your own list. An object or JSON string is valid. The filter will first check the `customEmojis` then fallback to the [Github Emojis][ghemojis] list.
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- **customEmojis** `object={}` - You can specify your own list. An object or JSON string is valid. The filter will first check the `customEmojis` then fallback to the [Github Emojis][ghemojis] list.
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For example:
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@ -129,7 +155,7 @@ no-emoji: true
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You can also render a GitHub emoji from a template using the `github_emoji` helper:
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```html
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<h1><% github_emoji('octocat') %></h1>
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<h1><%- github_emoji('octocat') %></h1>
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```
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[ghemojis]: https://api.github.com/emojis
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245
index.js
245
index.js
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@ -1,144 +1,187 @@
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'use strict'
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"use strict";
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/* global hexo */
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const _ = require('lodash')
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const path = require('path')
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const fs = require('fs')
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const { JSDOM } = require('jsdom')
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const _ = require("lodash");
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const { JSDOM } = require("jsdom");
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var options = _.assign({
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enable: true,
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inject: true,
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version: 'latest',
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className: 'github-emoji',
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}, hexo.config.githubEmojis)
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const options = Object.assign(
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{
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enable: true,
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inject: true,
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version: "latest",
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className: "github-emoji",
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},
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hexo.theme.githubEmojis || {},
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hexo.config.githubEmojis || {}
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);
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if (options.enable !== false) {
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const emojis = _.assign(
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{},
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require('./emojis.json'),
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loadCustomEmojis(options.customEmojis || options.localEmojis),
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)
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const emojis = Object.assign(
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{},
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require("./emojis.json"),
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loadCustomEmojis(options.customEmojis || options.localEmojis)
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);
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fs.writeFile(
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path.join(__dirname, 'emojis.json'),
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JSON.stringify(emojis, null, ' '),
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function (err) { err && console.warn(err) },
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)
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hexo.extend.helper.register("github_emoji", (name) =>
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renderEmoji(emojis, name)
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);
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hexo.extend.filter.register('after_post_render', data => {
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if (!options.inject && data['no-emoji']) { return data }
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hexo.extend.tag.register("github_emoji", (args) =>
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renderEmoji(emojis, args[0])
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);
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const $content = new JSDOM(data.content)
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const $excerpt = new JSDOM(data.excerpt)
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hexo.extend.filter.register("after_post_render", (data) => {
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if (data["no-emoji"]) {
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if (options.inject !== false) {
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data.content = `<style>${getEmojiStyles()}</style>` + data.content;
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}
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} else {
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const $content = new JSDOM(data.content);
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const $excerpt = new JSDOM(data.excerpt);
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if (options.inject) {
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const $script = $content.window.document.createElement('script')
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$script.innerHTML = `
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document.querySelectorAll('.${options.className}')
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.forEach(el => {
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if (!el.dataset.src) { return; }
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const img = document.createElement('img');
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img.style = 'display:none !important;';
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img.src = el.dataset.src;
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img.addEventListener('error', () => {
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img.remove();
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el.style.color = 'inherit';
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el.style.backgroundImage = 'none';
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el.style.background = 'none';
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});
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img.addEventListener('load', () => {
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img.remove();
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});
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document.body.appendChild(img);
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});
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`
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$content.window.document.body.appendChild($script)
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replaceColons($content.window.document.body, emojis);
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replaceColons($excerpt.window.document.body, emojis);
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if (options.inject !== false) {
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const style = $content.window.document.createElement("style");
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style.innerHTML = getEmojiStyles();
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$content.window.document.body.insertBefore(
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style,
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$content.window.document.body.firstElementChild
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);
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}
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if (!data['no-emoji']) {
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replaceColons($content.window.document.body, emojis)
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replaceColons($excerpt.window.document.body, emojis)
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}
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data.content = $content.window.document.body.innerHTML;
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data.excerpt = $excerpt.window.document.body.innerHTML;
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}
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data.content = $content.window.document.body.innerHTML
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data.excerpt = $excerpt.window.document.body.innerHTML
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return data
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})
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return data;
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});
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hexo.extend.helper.register('github_emoji', name => renderEmoji(emojis, name))
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hexo.extend.tag.register('github_emoji', args => renderEmoji(emojis, args[0]))
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}
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function replaceColons (node, emojis) {
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if (!node || !node.childNodes) { return }
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function replaceColons(node, emojis) {
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if (!node || !node.childNodes) {
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return;
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}
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for (let i = node.childNodes.length - 1; i >= 0; i--) {
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const child = node.childNodes[i]
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if (child.tagName === 'PRE' || child.tagName === 'CODE') { return }
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const child = node.childNodes[i];
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if (child.tagName === "PRE" || child.tagName === "CODE") {
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return;
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}
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if (child.nodeType === 3) {
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const content = child.data.replace(
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/:(\w+):/ig,
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(match, p1) => emojis[p1] ? renderEmoji(emojis, p1) : match,
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)
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const content = child.data.replace(/:(\w+):/gi, (match, p1) =>
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emojis[p1] ? renderEmoji(emojis, p1) : match
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);
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if (content !== child.data) {
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child.replaceWith(JSDOM.fragment(content))
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child.replaceWith(JSDOM.fragment(content));
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}
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} else {
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replaceColons(child, emojis)
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replaceColons(child, emojis);
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}
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}
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}
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function loadCustomEmojis (customEmojis) {
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function loadCustomEmojis(customEmojis) {
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// JSON string
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if (_.isString(customEmojis)) {
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try {
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customEmojis = JSON.parse(customEmojis)
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Object.keys(customEmojis).forEach(name => {
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customEmojis = JSON.parse(customEmojis);
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Object.keys(customEmojis).forEach((name) => {
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if (_.isString(customEmojis[name])) {
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customEmojis[name] = {
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src: customEmojis[name],
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}
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};
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}
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})
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});
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} catch (err) {
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customEmojis = {}
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console.warn('hexo-filter-github-emojis: Custom emojis not valid. Skipped.')
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customEmojis = {};
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console.warn(
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"hexo-filter-github-emojis: Custom emojis not valid. Skipped."
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);
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}
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}
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if (!_.isObject(customEmojis)) {
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customEmojis = {}
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customEmojis = {};
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}
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Object.values(customEmojis).forEach(emoji => {
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if (emoji.codepoints && !_.isArray(emoji.codepoints)) {
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emoji.codepoints = emoji.codepoints.split(' ')
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}
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})
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return Object.keys(customEmojis).reduce((emojis, name) => {
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const emoji = customEmojis[name];
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emojis[name] = Object.assign(
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{},
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emoji,
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emoji.codepoints && !_.isArray(emoji.codepoints)
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? { codepoints: emoji.codepoints.split(" ") }
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: {}
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);
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return emojis;
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}, {});
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}
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function renderEmoji (emojis, name) {
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if (!emojis[name]) { return name }
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function renderEmoji(emojis, name) {
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if (!emojis[name]) return name;
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const styles = _.isObject(options.styles)
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? Object.keys(options.styles)
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.filter(k => _.isString(options.styles[k]))
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.map(k => k + ':' + options.styles[k])
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: []
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if (options.inject) {
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styles.push(
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'color: transparent',
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`background:no-repeat url(${emojis[name].src}) center/contain`,
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)
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} else {
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styles.push(`background-image:url(${emojis[name].src})`)
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}
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? ` style="${Object.keys(options.styles)
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.map((k) => k + ":" + options.styles[k])
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.join(";")}"`
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: "";
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const codepoints = emojis[name].codepoints
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? emojis[name].codepoints.map(c => `&#x${c};`).join('')
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: ' '
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? emojis[name].codepoints.map((c) => `&#x${c};`).join("")
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: " ";
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return `<span class="${options.className}" style="${styles.join(';')}" data-src="${emojis[name].src}">${codepoints}</span>`
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return (
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`<span class="${options.className}" aria-hidden="true"${styles}>` +
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`<span>${codepoints}</span>` +
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`<img src="${emojis[name].src}" onerror="this.parent.classList.add('${options.className}-fallback')">` +
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`</span>`
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);
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}
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function getEmojiStyles() {
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const rules = `.${options.className} {
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position: relative;
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display: inline-block;
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width: 1.2em;
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min-height: 1.2em;
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overflow: hidden;
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vertical-align: top;
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color: transparent;
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}
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.${options.className} > span {
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position: relative;
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z-index: 10;
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}
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.${options.className} img,
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.${options.className} .fancybox {
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margin: 0 !important;
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padding: 0 !important;
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border: none !important;
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outline: none !important;
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text-decoration: none !important;
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user-select: none !important;
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cursor: auto !important;
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}
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.${options.className} img {
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height: 1.2em !important;
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width: 1.2em !important;
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position: absolute !important;
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left: 50% !important;
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top: 50% !important;
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transform: translate(-50%, -50%) !important;
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user-select: none !important;
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cursor: auto !important;
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}
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.${options.className}-fallback {
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color: inherit;
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}
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.${options.className}-fallback img {
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opacity: 0 !important;
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}`;
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return rules.replace(/^ +/gm, ' ').replace(/\n/g, '')
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}
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