Prism syntax highlighter – Copy to Clipboard – Fix

Recently I created a blog entry regarding enabling prism syntax highlighter on WordPress code snippets. There’s one extra setup needed if you are going to use the copy to clipboard plugin like this website uses.

In addition to including the plugin file with your PrismJS build, we will need to make sure Clipboard.js is loaded before the plugin. We can set it up in multiple ways.

  1. Add the snippet in existing prism.js file
  2. Enqueue clipboard.js before prism.js

Add the snippet in existing prism.js file

This is the simplest method. Here we just edit the existing prism.js file that we’ve uploaded previously and add this code snippet at the top of it:

/*!
 * clipboard.js v1.7.1
 * https://zenorocha.github.io/clipboard.js
 *
 * Licensed MIT © Zeno Rocha
 */
!function(t){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=t();else if("function"==typeof define&&define.amd)define([],t);else{var e;e="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,e.Clipboard=t()}}(function(){var t,e,n;return function t(e,n,o){function i(a,c){if(!n[a]){if(!e[a]){var l="function"==typeof require&&require;if(!c&&l)return l(a,!0);if(r)return r(a,!0);var s=new Error("Cannot find module '"+a+"'");throw s.code="MODULE_NOT_FOUND",s}var u=n[a]={exports:{}};e[a][0].call(u.exports,function(t){var n=e[a][1][t];return i(n||t)},u,u.exports,t,e,n,o)}return n[a].exports}for(var r="function"==typeof require&&require,a=0;a<o.length;a++)i(o[a]);return i}({1:[function(t,e,n){function o(t,e){for(;t&&t.nodeType!==i;){if("function"==typeof t.matches&&t.matches(e))return t;t=t.parentNode}}var i=9;if("undefined"!=typeof Element&&!Element.prototype.matches){var r=Element.prototype;r.matches=r.matchesSelector||r.mozMatchesSelector||r.msMatchesSelector||r.oMatchesSelector||r.webkitMatchesSelector}e.exports=o},{}],2:[function(t,e,n){function o(t,e,n,o,r){var a=i.apply(this,arguments);return t.addEventListener(n,a,r),{destroy:function(){t.removeEventListener(n,a,r)}}}function i(t,e,n,o){return function(n){n.delegateTarget=r(n.target,e),n.delegateTarget&&o.call(t,n)}}var r=t("./closest");e.exports=o},{"./closest":1}],3:[function(t,e,n){n.node=function(t){return void 0!==t&&t instanceof HTMLElement&&1===t.nodeType},n.nodeList=function(t){var e=Object.prototype.toString.call(t);return void 0!==t&&("[object NodeList]"===e||"[object HTMLCollection]"===e)&&"length"in t&&(0===t.length||n.node(t[0]))},n.string=function(t){return"string"==typeof t||t instanceof String},n.fn=function(t){return"[object Function]"===Object.prototype.toString.call(t)}},{}],4:[function(t,e,n){function o(t,e,n){if(!t&&!e&&!n)throw new Error("Missing required arguments");if(!c.string(e))throw new TypeError("Second argument must be a String");if(!c.fn(n))throw new TypeError("Third argument must be a Function");if(c.node(t))return i(t,e,n);if(c.nodeList(t))return r(t,e,n);if(c.string(t))return a(t,e,n);throw new TypeError("First argument must be a String, HTMLElement, HTMLCollection, or NodeList")}function i(t,e,n){return t.addEventListener(e,n),{destroy:function(){t.removeEventListener(e,n)}}}function r(t,e,n){return Array.prototype.forEach.call(t,function(t){t.addEventListener(e,n)}),{destroy:function(){Array.prototype.forEach.call(t,function(t){t.removeEventListener(e,n)})}}}function a(t,e,n){return l(document.body,t,e,n)}var c=t("./is"),l=t("delegate");e.exports=o},{"./is":3,delegate:2}],5:[function(t,e,n){function o(t){var e;if("SELECT"===t.nodeName)t.focus(),e=t.value;else if("INPUT"===t.nodeName||"TEXTAREA"===t.nodeName){var n=t.hasAttribute("readonly");n||t.setAttribute("readonly",""),t.select(),t.setSelectionRange(0,t.value.length),n||t.removeAttribute("readonly"),e=t.value}else{t.hasAttribute("contenteditable")&&t.focus();var o=window.getSelection(),i=document.createRange();i.selectNodeContents(t),o.removeAllRanges(),o.addRange(i),e=o.toString()}return e}e.exports=o},{}],6:[function(t,e,n){function o(){}o.prototype={on:function(t,e,n){var o=this.e||(this.e={});return(o[t]||(o[t]=[])).push({fn:e,ctx:n}),this},once:function(t,e,n){function o(){i.off(t,o),e.apply(n,arguments)}var i=this;return o._=e,this.on(t,o,n)},emit:function(t){var e=[].slice.call(arguments,1),n=((this.e||(this.e={}))[t]||[]).slice(),o=0,i=n.length;for(o;o<i;o++)n[o].fn.apply(n[o].ctx,e);return this},off:function(t,e){var n=this.e||(this.e={}),o=n[t],i=[];if(o&&e)for(var r=0,a=o.length;r<a;r++)o[r].fn!==e&&o[r].fn._!==e&&i.push(o[r]);return i.length?n[t]=i:delete n[t],this}},e.exports=o},{}],7:[function(e,n,o){!function(i,r){if("function"==typeof t&&t.amd)t(["module","select"],r);else if(void 0!==o)r(n,e("select"));else{var a={exports:{}};r(a,i.select),i.clipboardAction=a.exports}}(this,function(t,e){"use strict";function n(t){return t&&t.__esModule?t:{default:t}}function o(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}var i=n(e),r="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},a=function(){function t(t,e){for(var n=0;n<e.length;n++){var o=e[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(t,o.key,o)}}return function(e,n,o){return n&&t(e.prototype,n),o&&t(e,o),e}}(),c=function(){function t(e){o(this,t),this.resolveOptions(e),this.initSelection()}return a(t,[{key:"resolveOptions",value:function t(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};this.action=e.action,this.container=e.container,this.emitter=e.emitter,this.target=e.target,this.text=e.text,this.trigger=e.trigger,this.selectedText=""}},{key:"initSelection",value:function t(){this.text?this.selectFake():this.target&&this.selectTarget()}},{key:"selectFake",value:function t(){var e=this,n="rtl"==document.documentElement.getAttribute("dir");this.removeFake(),this.fakeHandlerCallback=function(){return e.removeFake()},this.fakeHandler=this.container.addEventListener("click",this.fakeHandlerCallback)||!0,this.fakeElem=document.createElement("textarea"),this.fakeElem.style.fontSize="12pt",this.fakeElem.style.border="0",this.fakeElem.style.padding="0",this.fakeElem.style.margin="0",this.fakeElem.style.position="absolute",this.fakeElem.style[n?"right":"left"]="-9999px";var o=window.pageYOffset||document.documentElement.scrollTop;this.fakeElem.style.top=o+"px",this.fakeElem.setAttribute("readonly",""),this.fakeElem.value=this.text,this.container.appendChild(this.fakeElem),this.selectedText=(0,i.default)(this.fakeElem),this.copyText()}},{key:"removeFake",value:function t(){this.fakeHandler&&(this.container.removeEventListener("click",this.fakeHandlerCallback),this.fakeHandler=null,this.fakeHandlerCallback=null),this.fakeElem&&(this.container.removeChild(this.fakeElem),this.fakeElem=null)}},{key:"selectTarget",value:function t(){this.selectedText=(0,i.default)(this.target),this.copyText()}},{key:"copyText",value:function t(){var e=void 0;try{e=document.execCommand(this.action)}catch(t){e=!1}this.handleResult(e)}},{key:"handleResult",value:function t(e){this.emitter.emit(e?"success":"error",{action:this.action,text:this.selectedText,trigger:this.trigger,clearSelection:this.clearSelection.bind(this)})}},{key:"clearSelection",value:function t(){this.trigger&&this.trigger.focus(),window.getSelection().removeAllRanges()}},{key:"destroy",value:function t(){this.removeFake()}},{key:"action",set:function t(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"copy";if(this._action=e,"copy"!==this._action&&"cut"!==this._action)throw new Error('Invalid "action" value, use either "copy" or "cut"')},get:function t(){return this._action}},{key:"target",set:function t(e){if(void 0!==e){if(!e||"object"!==(void 0===e?"undefined":r(e))||1!==e.nodeType)throw new Error('Invalid "target" value, use a valid Element');if("copy"===this.action&&e.hasAttribute("disabled"))throw new Error('Invalid "target" attribute. Please use "readonly" instead of "disabled" attribute');if("cut"===this.action&&(e.hasAttribute("readonly")||e.hasAttribute("disabled")))throw new Error('Invalid "target" attribute. You can\'t cut text from elements with "readonly" or "disabled" attributes');this._target=e}},get:function t(){return this._target}}]),t}();t.exports=c})},{select:5}],8:[function(e,n,o){!function(i,r){if("function"==typeof t&&t.amd)t(["module","./clipboard-action","tiny-emitter","good-listener"],r);else if(void 0!==o)r(n,e("./clipboard-action"),e("tiny-emitter"),e("good-listener"));else{var a={exports:{}};r(a,i.clipboardAction,i.tinyEmitter,i.goodListener),i.clipboard=a.exports}}(this,function(t,e,n,o){"use strict";function i(t){return t&&t.__esModule?t:{default:t}}function r(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function a(t,e){if(!t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!e||"object"!=typeof e&&"function"!=typeof e?t:e}function c(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function, not "+typeof e);t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,enumerable:!1,writable:!0,configurable:!0}}),e&&(Object.setPrototypeOf?Object.setPrototypeOf(t,e):t.__proto__=e)}function l(t,e){var n="data-clipboard-"+t;if(e.hasAttribute(n))return e.getAttribute(n)}var s=i(e),u=i(n),f=i(o),d="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},h=function(){function t(t,e){for(var n=0;n<e.length;n++){var o=e[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(t,o.key,o)}}return function(e,n,o){return n&&t(e.prototype,n),o&&t(e,o),e}}(),p=function(t){function e(t,n){r(this,e);var o=a(this,(e.__proto__||Object.getPrototypeOf(e)).call(this));return o.resolveOptions(n),o.listenClick(t),o}return c(e,t),h(e,[{key:"resolveOptions",value:function t(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};this.action="function"==typeof e.action?e.action:this.defaultAction,this.target="function"==typeof e.target?e.target:this.defaultTarget,this.text="function"==typeof e.text?e.text:this.defaultText,this.container="object"===d(e.container)?e.container:document.body}},{key:"listenClick",value:function t(e){var n=this;this.listener=(0,f.default)(e,"click",function(t){return n.onClick(t)})}},{key:"onClick",value:function t(e){var n=e.delegateTarget||e.currentTarget;this.clipboardAction&&(this.clipboardAction=null),this.clipboardAction=new s.default({action:this.action(n),target:this.target(n),text:this.text(n),container:this.container,trigger:n,emitter:this})}},{key:"defaultAction",value:function t(e){return l("action",e)}},{key:"defaultTarget",value:function t(e){var n=l("target",e);if(n)return document.querySelector(n)}},{key:"defaultText",value:function t(e){return l("text",e)}},{key:"destroy",value:function t(){this.listener.destroy(),this.clipboardAction&&(this.clipboardAction.destroy(),this.clipboardAction=null)}}],[{key:"isSupported",value:function t(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:["copy","cut"],n="string"==typeof e?[e]:e,o=!!document.queryCommandSupported;return n.forEach(function(t){o=o&&!!document.queryCommandSupported(t)}),o}}]),e}(u.default);t.exports=p})},{"./clipboard-action":7,"good-listener":4,"tiny-emitter":6}]},{},[8])(8)});
Please make sure you do not make any changes to the existing code. We only need to add the above code at the beginning of the file. You can add a space or two at the end or move the existing code to the second line and then add the above code, but DO NOT edit the existing code

Enqueue clipboard.js as a separate file

This is another method. Here we create a new file with the above code and then register clipboardJS separately. The following code does the magic:

// Register clipboard.js file

function clipboardjs() { 
wp_register_script('clipboardJS', get_stylesheet_directory_uri() . '/prism/clipboard.js' // location of clipboard.js file);
wp_enqueue_script('clipboardJS');
}
add_action('wp_enqueue_scripts', 'clipboardjs');

Or you can just replace the code added in this method with the fllowing code

// Prism syntax highlighting
function prism_syntax_highlight() {
// Register prism.css file
wp_register_style(
'prismCSS', get_stylesheet_directory_uri() . '/prism/prism.css' // location of prism.css file
);
// Register clipboard.js file
wp_register_script(
'clipboardJS', get_stylesheet_directory_uri() . '/prism/clipboard.js' // location of clipboard.js file
);
// Register prism.js file
wp_register_script(
'prismJS', get_stylesheet_directory_uri() . '/prism/prism.js' // location of prism.js file
);
// Enqueue the registered style and script files
wp_enqueue_style('prismCSS');
wp_enqueue_script('clipboardJS');
wp_enqueue_script('prismJS');
}
add_action('wp_enqueue_scripts', 'prism_syntax_highlight');

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