Plugin: color previewer

components.js

@@ -478,6 +478,15 @@ var components = {
 			"title": "Remove initial line feed",
 			"owner": "Golmote",
 			"noCSS": true
+		},
+		"previewer-base": {
+			"title": "Previewer Base",
+			"owner": "Golmote"
+		},
+		"previewer-color": {
+			"title": "Previewer Color",
+			"require": "previewer-base",
+			"owner": "Golmote"
 		}
 	}
 };

plugins/previewer-base/prism-previewer-base.css

@@ -0,0 +1,76 @@
+.prism-previewer,
+.prism-previewer:before,
+.prism-previewer:after {
+	position: absolute;
+	pointer-events: none;
+}
+.prism-previewer,
+.prism-previewer:after {
+	left: 50%;
+}
+.prism-previewer {
+	margin-top: -48px;
+	width: 32px;
+	height: 32px;
+	margin-left: -16px;
+
+	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=$opacity)";
+	filter: alpha(opacity=0);
+	-khtml-opacity: 0;
+	-moz-opacity: 0;
+	opacity: 0;
+	-webkit-transition: opacity .25s;
+	-moz-transition: opacity .25s;
+	-o-transition: opacity .25s;
+	transition: opacity .25s;
+}
+.prism-previewer.flipped {
+	margin-top: 0;
+	margin-bottom: -48px;
+}
+.prism-previewer:before,
+.prism-previewer:after {
+	content: '';
+	position: absolute;
+	pointer-events: none;
+}
+.prism-previewer:before {
+	top: -5px;
+	right: -5px;
+	left: -5px;
+	bottom: -5px;
+	-webkit-border-radius: 10px;
+	-moz-border-radius: 10px;
+	border-radius: 10px;
+	border: 5px solid #fff;
+	-webkit-box-shadow: 0 0 3px rgba(0, 0, 0, 0.5) inset, 0 0 10px rgba(0, 0, 0, 0.75);
+	-moz-box-shadow: 0 0 3px rgba(0, 0, 0, 0.5) inset, 0 0 10px rgba(0, 0, 0, 0.75);
+	-ms-box-shadow: 0 0 3px rgba(0, 0, 0, 0.5) inset, 0 0 10px rgba(0, 0, 0, 0.75);
+	-o-box-shadow: 0 0 3px rgba(0, 0, 0, 0.5) inset, 0 0 10px rgba(0, 0, 0, 0.75);
+	box-shadow: 0 0 3px rgba(0, 0, 0, 0.5) inset, 0 0 10px rgba(0, 0, 0, 0.75);
+}
+
+.prism-previewer:after {
+	top: 100%;
+	width: 0;
+	height: 0;
+	margin: 5px 0 0 -7px;
+	border: 7px solid transparent;
+	border-color: rgba(255, 0, 0, 0);
+	border-top-color: #fff;
+}
+.prism-previewer.flipped:after {
+	top: auto;
+	bottom: 100%;
+	margin-top: 0;
+	margin-bottom: 5px;
+	border-top-color: rgba(255, 0, 0, 0);
+	border-bottom-color: #fff;
+}
+.prism-previewer.active {
+	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=$opacity)";
+	filter: alpha(opacity=1);
+	-khtml-opacity: 1;
+	-moz-opacity: 1;
+	opacity: 1;
+}

plugins/previewer-base/prism-previewer-base.js

@@ -0,0 +1,186 @@
+(function() {
+
+	if (typeof self === 'undefined' || !self.Prism || !self.document) {
+		return;
+	}
+
+	/**
+	 * Returns the absolute X, Y offsets for an element
+	 * @param {HTMLElement} element
+	 * @returns {{top: number, right: number, bottom: number, left: number}}
+	 */
+	var getOffset = function (element) {
+		var left = 0, top = 0, el = element;
+
+		if (el.parentNode) {
+			do {
+				left += el.offsetLeft;
+				top += el.offsetTop;
+			} while ((el = el.offsetParent) && el.nodeType < 9);
+
+			el = element;
+
+			do {
+				left -= el.scrollLeft;
+				top -= el.scrollTop;
+			} while ((el = el.parentNode) && !/body/i.test(el.nodeName));
+		}
+
+		return {
+			top: top,
+			right: innerWidth - left - element.offsetWidth,
+			bottom: innerHeight - top - element.offsetHeight,
+			left: left
+		};
+	};
+
+	var tokenRegexp = /(?:^|\s)token(?=$|\s)/;
+	var activeRegexp = /(?:^|\s)active(?=$|\s)/g;
+	var flippedRegexp = /(?:^|\s)flipped(?=$|\s)/g;
+
+	/**
+	 * Previewer constructor
+	 * @param {string} type Unique previewer type
+	 * @param {function} updater Function that will be called on mouseover.
+	 * @param {string[]|string=} supportedLanguages Aliases of the languages this previewer must be enabled for. Defaults to "*", all languages.
+	 * @constructor
+	 */
+	var Previewer = function (type, updater, supportedLanguages) {
+		this._elt = null;
+		this._type = type;
+		this._clsRegexp = RegExp('(?:^|\\s)' + type + '(?=$|\\s)');
+		this._token = null;
+		this.updater = updater;
+		this._mouseout = this.mouseout.bind(this);
+
+		var self = this;
+
+		if (!supportedLanguages) {
+			supportedLanguages = ['*'];
+		}
+		if (Prism.util.type(supportedLanguages) !== 'Array') {
+			supportedLanguages = [supportedLanguages];
+		}
+		supportedLanguages.forEach(function (lang) {
+			if (typeof lang !== 'string') {
+				lang = lang.lang;
+			}
+			if (!Previewer.byLanguages[lang]) {
+				Previewer.byLanguages[lang] = [];
+			}
+			if (Previewer.byLanguages[lang].indexOf(self) < 0) {
+				Previewer.byLanguages[lang].push(self);
+			}
+		});
+	};
+
+	/**
+	 * Creates the HTML element for the previewer.
+	 */
+	Previewer.prototype.init = function () {
+		if (this._elt) {
+			return;
+		}
+		this._elt = document.createElement('div');
+		this._elt.className = 'prism-previewer prism-previewer-' + this._type;
+		document.body.appendChild(this._elt);
+	};
+
+	/**
+	 * Checks the class name of each hovered element
+	 * @param token
+	 */
+	Previewer.prototype.check = function (token) {
+		if (tokenRegexp.test(token.className) && this._clsRegexp.test(token.className)) {
+			if (token !== this._token) {
+				this._token = token;
+				this.show();
+			}
+		}
+	};
+
+	/**
+	 * Called on mouseout
+	 */
+	Previewer.prototype.mouseout = function() {
+		this._token.removeEventListener('mouseout', this._mouseout, false);
+		this._token = null;
+		this.hide();
+	};
+
+	/**
+	 * Shows the previewer positioned properly for the current token.
+	 */
+	Previewer.prototype.show = function () {
+		if (!this._elt) {
+			this.init();
+		}
+		if (!this._token) {
+			return;
+		}
+
+		if (this.updater.call(this._elt, this._token.textContent)) {
+			this._token.addEventListener('mouseout', this._mouseout, false);
+
+			var offset = getOffset(this._token);
+			this._elt.className += ' active';
+
+			if (offset.top - this._elt.offsetHeight > 0) {
+				this._elt.className = this._elt.className.replace(flippedRegexp, '');
+				this._elt.style.top = offset.top + 'px';
+				this._elt.style.bottom = '';
+			} else {
+				this._elt.className +=  ' flipped';
+				this._elt.style.bottom = offset.bottom + 'px';
+				this._elt.style.top = '';
+			}
+
+			this._elt.style.left = offset.left + Math.min(200, this._token.offsetWidth / 2) + 'px';
+		} else {
+			this.hide();
+		}
+	};
+
+	/**
+	 * Hides the previewer.
+	 */
+	Previewer.prototype.hide = function () {
+		this._elt.className = this._elt.className.replace(activeRegexp, '');
+	};
+
+	/**
+	 * Map of all registered previewers by language
+	 * @type {{}}
+	 */
+	Previewer.byLanguages = {};
+
+	/**
+	 * Initializes the mouseover event on the code block.
+	 * @param {HTMLElement} elt The code block (env.element)
+	 * @param {string} lang The language (env.language)
+	 */
+	Previewer.initEvents = function (elt, lang) {
+		var previewers = [];
+		if (Previewer.byLanguages[lang]) {
+			previewers = previewers.concat(Previewer.byLanguages[lang]);
+		}
+		if (Previewer.byLanguages['*']) {
+			previewers = previewers.concat(Previewer.byLanguages['*']);
+		}
+		elt.addEventListener('mouseover', function (e) {
+			var target = e.target;
+			previewers.forEach(function (previewer) {
+				previewer.check(target);
+			});
+		}, false);
+	};
+	Prism.plugins.Previewer = Previewer;
+
+	// Initialize the previewers only when needed
+	Prism.hooks.add('after-highlight', function (env) {
+		if(Previewer.byLanguages['*'] || Previewer.byLanguages[env.language]) {
+			Previewer.initEvents(env.element, env.language);
+		}
+	});
+
+}());

plugins/previewer-color/prism-previewer-color.css

@@ -0,0 +1,9 @@
+.prism-previewer-color {
+	background-image: linear-gradient(45deg, #bbb 25%, transparent 25%, transparent 75%, #bbb 75%, #bbb), linear-gradient(45deg, #bbb 25%, #eee 25%, #eee 75%, #bbb 75%, #bbb);
+	background-size: 10px 10px;
+	background-position: 0 0, 5px 5px;
+}
+.prism-previewer-color:before {
+	background-color: inherit;
+	background-clip: padding-box;
+}

plugins/previewer-color/prism-previewer-color.js

@@ -0,0 +1,66 @@
+(function() {
+
+	if (
+		typeof self !== 'undefined' && !self.Prism ||
+		typeof global !== 'undefined' && !global.Prism
+	) {
+		return;
+	}
+
+	var languages = [
+		'css',
+		'less',
+		{
+			lang: 'markup',
+			before: 'punctuation',
+			inside: 'inside',
+			root: Prism.languages.markup && Prism.languages.markup['tag'].inside['attr-value']
+		},
+		{
+			lang: 'sass',
+			inside: 'inside',
+			root: Prism.languages.sass && Prism.languages.sass['property-line']
+		},
+		'scss',
+		{
+			lang: 'stylus',
+			before: 'hexcode',
+			inside: 'rest',
+			root: Prism.languages.stylus && Prism.languages.stylus['property-declaration'].inside
+		},
+		{
+			lang: 'stylus',
+			before: 'hexcode',
+			inside: 'rest',
+			root: Prism.languages.stylus && Prism.languages.stylus['variable-declaration'].inside
+		}
+	];
+
+	languages.forEach(function (lang) {
+		var before, inside, root, skip;
+		if (typeof lang === 'string') {
+			before = 'important';
+			inside = lang;
+		} else {
+			before = lang.before || 'important';
+			inside = lang.inside || lang.lang;
+			root = lang.root || Prism.languages;
+			skip = lang.skip;
+			lang = lang.lang;
+		}
+		if(!skip && Prism.languages[lang]) {
+			Prism.languages.insertBefore(inside, before, {
+				'color': /(?:\B#(?:[0-9a-f]{3}){1,2}\b|\b(?:rgb|hsl)\(\s*\d{1,3}\s*,\s*\d{1,3}%?\s*,\s*\d{1,3}%?\s*\)\B|\b(?:rgb|hsl)a\(\s*\d{1,3}\s*,\s*\d{1,3}%?\s*,\s*\d{1,3}%?\s*,\s*(?:0|0?\.\d+|1)\s*\)\B|\b(?:AliceBlue|AntiqueWhite|Aqua|Aquamarine|Azure|Beige|Bisque|Black|BlanchedAlmond|Blue|BlueViolet|Brown|BurlyWood|CadetBlue|Chartreuse|Chocolate|Coral|CornflowerBlue|Cornsilk|Crimson|Cyan|DarkBlue|DarkCyan|DarkGoldenRod|DarkGray|DarkGreen|DarkKhaki|DarkMagenta|DarkOliveGreen|DarkOrange|DarkOrchid|DarkRed|DarkSalmon|DarkSeaGreen|DarkSlateBlue|DarkSlateGray|DarkTurquoise|DarkViolet|DeepPink|DeepSkyBlue|DimGray|DodgerBlue|FireBrick|FloralWhite|ForestGreen|Fuchsia|Gainsboro|GhostWhite|Gold|GoldenRod|Gray|Green|GreenYellow|HoneyDew|HotPink|IndianRed|Indigo|Ivory|Khaki|Lavender|LavenderBlush|LawnGreen|LemonChiffon|LightBlue|LightCoral|LightCyan|LightGoldenRodYellow|LightGray|LightGreen|LightPink|LightSalmon|LightSeaGreen|LightSkyBlue|LightSlateGray|LightSteelBlue|LightYellow|Lime|LimeGreen|Linen|Magenta|Maroon|MediumAquaMarine|MediumBlue|MediumOrchid|MediumPurple|MediumSeaGreen|MediumSlateBlue|MediumSpringGreen|MediumTurquoise|MediumVioletRed|MidnightBlue|MintCream|MistyRose|Moccasin|NavajoWhite|Navy|OldLace|Olive|OliveDrab|Orange|OrangeRed|Orchid|PaleGoldenRod|PaleGreen|PaleTurquoise|PaleVioletRed|PapayaWhip|PeachPuff|Peru|Pink|Plum|PowderBlue|Purple|Red|RosyBrown|RoyalBlue|SaddleBrown|Salmon|SandyBrown|SeaGreen|SeaShell|Sienna|Silver|SkyBlue|SlateBlue|SlateGray|Snow|SpringGreen|SteelBlue|Tan|Teal|Thistle|Tomato|Turquoise|Violet|Wheat|White|WhiteSmoke|Yellow|YellowGreen)\b)/i
+			}, root);
+		}
+	});
+
+	if (Prism.plugins.Previewer) {
+		new Prism.plugins.Previewer('color', function(value) {
+			this.style.backgroundColor = '';
+			this.style.backgroundColor = value;
+			return !!this.style.backgroundColor;
+		});
+	}
+
+}());