08-27-周三_17-09-29

node_modules/prismjs/plugins/match-braces/prism-match-braces.js

@@ -0,0 +1,184 @@
+(function () {
+
+	if (typeof self === 'undefined' || !self.Prism || !self.document) {
+		return;
+	}
+
+	var MATCH_ALL_CLASS = /(?:^|\s)match-braces(?:\s|$)/;
+
+	var BRACE_HOVER_CLASS = /(?:^|\s)brace-hover(?:\s|$)/;
+	var BRACE_SELECTED_CLASS = /(?:^|\s)brace-selected(?:\s|$)/;
+
+	var NO_BRACE_HOVER_CLASS = /(?:^|\s)no-brace-hover(?:\s|$)/;
+	var NO_BRACE_SELECT_CLASS = /(?:^|\s)no-brace-select(?:\s|$)/;
+
+	var PARTNER = {
+		'(': ')',
+		'[': ']',
+		'{': '}',
+	};
+
+	var NAMES = {
+		'(': 'brace-round',
+		'[': 'brace-square',
+		'{': 'brace-curly',
+	};
+
+	var LEVEL_WARP = 12;
+
+	var pairIdCounter = 0;
+
+	var BRACE_ID_PATTERN = /^(pair-\d+-)(open|close)$/;
+
+	/**
+	 * Returns the brace partner given one brace of a brace pair.
+	 *
+	 * @param {HTMLElement} brace
+	 * @returns {HTMLElement}
+	 */
+	function getPartnerBrace(brace) {
+		var match = BRACE_ID_PATTERN.exec(brace.id);
+		return document.querySelector('#' + match[1] + (match[2] == 'open' ? 'close' : 'open'));
+	}
+
+	/**
+	 * @this {HTMLElement}
+	 */
+	function hoverBrace() {
+		for (var parent = this.parentElement; parent; parent = parent.parentElement) {
+			if (NO_BRACE_HOVER_CLASS.test(parent.className)) {
+				return;
+			}
+		}
+
+		[this, getPartnerBrace(this)].forEach(function (ele) {
+			ele.className = (ele.className.replace(BRACE_HOVER_CLASS, ' ') + ' brace-hover').replace(/\s+/g, ' ');
+		});
+	}
+	/**
+	 * @this {HTMLElement}
+	 */
+	function leaveBrace() {
+		[this, getPartnerBrace(this)].forEach(function (ele) {
+			ele.className = ele.className.replace(BRACE_HOVER_CLASS, ' ');
+		});
+	}
+	/**
+	 * @this {HTMLElement}
+	 */
+	function clickBrace() {
+		for (var parent = this.parentElement; parent; parent = parent.parentElement) {
+			if (NO_BRACE_SELECT_CLASS.test(parent.className)) {
+				return;
+			}
+		}
+
+		[this, getPartnerBrace(this)].forEach(function (ele) {
+			ele.className = (ele.className.replace(BRACE_SELECTED_CLASS, ' ') + ' brace-selected').replace(/\s+/g, ' ');
+		});
+	}
+
+	Prism.hooks.add('complete', function (env) {
+
+		/** @type {HTMLElement} */
+		var code = env.element;
+		var pre = code.parentElement;
+
+		if (!pre || pre.tagName != 'PRE') {
+			return;
+		}
+
+		// find the braces to match
+		/** @type {string[]} */
+		var toMatch = [];
+		for (var ele = code; ele; ele = ele.parentElement) {
+			if (MATCH_ALL_CLASS.test(ele.className)) {
+				toMatch.push('(', '[', '{');
+				break;
+			}
+		}
+
+		if (toMatch.length == 0) {
+			// nothing to match
+			return;
+		}
+
+		if (!pre.__listenerAdded) {
+			// code blocks might be highlighted more than once
+			pre.addEventListener('mousedown', function removeBraceSelected() {
+				// the code element might have been replaced
+				var code = pre.querySelector('code');
+				Array.prototype.slice.call(code.querySelectorAll('.brace-selected')).forEach(function (element) {
+					element.className = element.className.replace(BRACE_SELECTED_CLASS, ' ');
+				});
+			});
+			Object.defineProperty(pre, '__listenerAdded', { value: true });
+		}
+
+		/** @type {HTMLSpanElement[]} */
+		var punctuation = Array.prototype.slice.call(code.querySelectorAll('span.token.punctuation'));
+
+		/** @type {{ index: number, open: boolean, element: HTMLElement }[]} */
+		var allBraces = [];
+
+		toMatch.forEach(function (open) {
+			var close = PARTNER[open];
+			var name = NAMES[open];
+
+			/** @type {[number, number][]} */
+			var pairs = [];
+			/** @type {number[]} */
+			var openStack = [];
+
+			for (var i = 0; i < punctuation.length; i++) {
+				var element = punctuation[i];
+				if (element.childElementCount == 0) {
+					var text = element.textContent;
+					if (text === open) {
+						allBraces.push({ index: i, open: true, element: element });
+						element.className += ' ' + name;
+						element.className += ' brace-open';
+						openStack.push(i);
+					} else if (text === close) {
+						allBraces.push({ index: i, open: false, element: element });
+						element.className += ' ' + name;
+						element.className += ' brace-close';
+						if (openStack.length) {
+							pairs.push([i, openStack.pop()]);
+						}
+					}
+				}
+			}
+
+			pairs.forEach(function (pair) {
+				var pairId = 'pair-' + (pairIdCounter++) + '-';
+
+				var openEle = punctuation[pair[0]];
+				var closeEle = punctuation[pair[1]];
+
+				openEle.id = pairId + 'open';
+				closeEle.id = pairId + 'close';
+
+				[openEle, closeEle].forEach(function (ele) {
+					ele.addEventListener('mouseenter', hoverBrace);
+					ele.addEventListener('mouseleave', leaveBrace);
+					ele.addEventListener('click', clickBrace);
+				});
+			});
+		});
+
+		var level = 0;
+		allBraces.sort(function (a, b) { return a.index - b.index; });
+		allBraces.forEach(function (brace) {
+			if (brace.open) {
+				brace.element.className += ' brace-level-' + (level % LEVEL_WARP + 1);
+				level++;
+			} else {
+				level = Math.max(0, level - 1);
+				brace.element.className += ' brace-level-' + (level % LEVEL_WARP + 1);
+			}
+		});
+
+	});
+
+}());