Hash :
e63058f9
Author :
Date :
2017-12-05T22:16:35
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
(function () {
if (typeof self === 'undefined' || !self.Prism || !self.document) {
return;
}
/**
* Plugin name which is used as a class name for <pre> which is activating the plugin
* @type {String}
*/
var PLUGIN_NAME = 'line-numbers';
/**
* Regular expression used for determining line breaks
* @type {RegExp}
*/
var NEW_LINE_EXP = /\n(?!$)/g;
/**
* Resizes line numbers spans according to height of line of code
* @param {Element} element <pre> element
*/
var _resizeElement = function (element) {
var codeStyles = getStyles(element);
var whiteSpace = codeStyles['white-space'];
if (whiteSpace === 'pre-wrap' || whiteSpace === 'pre-line') {
var codeElement = element.querySelector('code');
var lineNumbersWrapper = element.querySelector('.line-numbers-rows');
var lineNumberSizer = element.querySelector('.line-numbers-sizer');
var codeLines = codeElement.textContent.split(NEW_LINE_EXP);
if (!lineNumberSizer) {
lineNumberSizer = document.createElement('span');
lineNumberSizer.className = 'line-numbers-sizer';
codeElement.appendChild(lineNumberSizer);
}
lineNumberSizer.style.display = 'block';
codeLines.forEach(function (line, lineNumber) {
lineNumberSizer.textContent = line || '\n';
var lineSize = lineNumberSizer.getBoundingClientRect().height;
lineNumbersWrapper.children[lineNumber].style.height = lineSize + 'px';
});
lineNumberSizer.textContent = '';
lineNumberSizer.style.display = 'none';
}
};
/**
* Returns style declarations for the element
* @param {Element} element
*/
var getStyles = function (element) {
if (!element) {
return null;
}
return window.getComputedStyle ? getComputedStyle(element) : (element.currentStyle || null);
};
window.addEventListener('resize', function () {
Array.prototype.forEach.call(document.querySelectorAll('pre.' + PLUGIN_NAME), _resizeElement);
});
Prism.hooks.add('complete', function (env) {
if (!env.code) {
return;
}
// works only for <code> wrapped inside <pre> (not inline)
var pre = env.element.parentNode;
var clsReg = /\s*\bline-numbers\b\s*/;
if (
!pre || !/pre/i.test(pre.nodeName) ||
// Abort only if nor the <pre> nor the <code> have the class
(!clsReg.test(pre.className) && !clsReg.test(env.element.className))
) {
return;
}
if (env.element.querySelector('.line-numbers-rows')) {
// Abort if line numbers already exists
return;
}
if (clsReg.test(env.element.className)) {
// Remove the class 'line-numbers' from the <code>
env.element.className = env.element.className.replace(clsReg, ' ');
}
if (!clsReg.test(pre.className)) {
// Add the class 'line-numbers' to the <pre>
pre.className += ' line-numbers';
}
var match = env.code.match(NEW_LINE_EXP);
var linesNum = match ? match.length + 1 : 1;
var lineNumbersWrapper;
var lines = new Array(linesNum + 1);
lines = lines.join('<span></span>');
lineNumbersWrapper = document.createElement('span');
lineNumbersWrapper.setAttribute('aria-hidden', 'true');
lineNumbersWrapper.className = 'line-numbers-rows';
lineNumbersWrapper.innerHTML = lines;
if (pre.hasAttribute('data-start')) {
pre.style.counterReset = 'linenumber ' + (parseInt(pre.getAttribute('data-start'), 10) - 1);
}
env.element.appendChild(lineNumbersWrapper);
_resizeElement(pre);
Prism.hooks.run('line-numbers', env);
});
Prism.hooks.add('line-numbers', function (env) {
env.plugins = env.plugins || {};
env.plugins.lineNumbers = true;
});
/**
* Global exports
*/
Prism.plugins.lineNumbers = {
/**
* Get node for provided line number
* @param {Element} element pre element
* @param {Number} number line number
* @return {Element|undefined}
*/
getLine: function (element, number) {
if (element.tagName !== 'PRE' || !element.classList.contains(PLUGIN_NAME)) {
return;
}
var lineNumberRows = element.querySelector('.line-numbers-rows');
var lineNumberStart = parseInt(element.getAttribute('data-start'), 10) || 1;
var lineNumberEnd = lineNumberStart + (lineNumberRows.children.length - 1);
if (number < lineNumberStart) {
number = lineNumberStart;
}
if (number > lineNumberEnd) {
number = lineNumberEnd;
}
var lineIndex = number - lineNumberStart;
return lineNumberRows.children[lineIndex];
}
};
}());