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prism-line-numbers.js
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prism-line-numbers.js
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(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(?!$)/g;
/**
* Resizes line numbers spans according to height of line of code
* @param {Element} element <pre> element
*/
var _resizeElement = function (element) {
var codeStyles = getStyles(element);
var whiteSpace = codeStyles['white-space'];
if (whiteSpace === 'pre-wrap' || whiteSpace === 'pre-line') {
var codeElement = element.querySelector('code');
var lineNumbersWrapper = element.querySelector('.line-numbers-rows');
if (!codeElement || !lineNumbersWrapper) {
return;
}
var lineNumberSizer = element.querySelector('.line-numbers-sizer');
var codeLines = codeElement.textContent.split(NEW_LINE_EXP);
if (!lineNumberSizer) {
lineNumberSizer = document.createElement('span');
lineNumberSizer.className = 'line-numbers-sizer';
codeElement.appendChild(lineNumberSizer);
}
lineNumberSizer.style.display = 'block';
codeLines.forEach(function (line, lineNumber) {
lineNumberSizer.textContent = line || '\n';
var lineSize = lineNumberSizer.getBoundingClientRect().height;
lineNumbersWrapper.children[lineNumber].style.height = lineSize + 'px';
});
lineNumberSizer.textContent = '';
lineNumberSizer.style.display = 'none';
}
};
/**
* Returns style declarations for the element
* @param {Element} element
*/
var getStyles = function (element) {
if (!element) {
return null;
}
return window.getComputedStyle ? getComputedStyle(element) : (element.currentStyle || null);
};
window.addEventListener('resize', function () {
Array.prototype.forEach.call(document.querySelectorAll('pre.' + PLUGIN_NAME), _resizeElement);
});
Prism.hooks.add('complete', function (env) {
if (!env.code) {
return;
}
var code = env.element;
var pre = code.parentNode;
// works only for <code> wrapped inside <pre> (not inline)
if (!pre || !/pre/i.test(pre.nodeName)) {
return;
}
// Abort if line numbers already exists
if (code.querySelector('.line-numbers-rows')) {
return;
}
var addLineNumbers = false;
var lineNumbersRegex = /(?:^|\s)line-numbers(?:\s|$)/;
for (var element = code; element; element = element.parentNode) {
if (lineNumbersRegex.test(element.className)) {
addLineNumbers = true;
break;
}
}
// only add line numbers if <code> or one of its ancestors has the `line-numbers` class
if (!addLineNumbers) {
return;
}
// Remove the class 'line-numbers' from the <code>
code.className = code.className.replace(lineNumbersRegex, ' ');
// Add the class 'line-numbers' to the <pre>
if (!lineNumbersRegex.test(pre.className)) {
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).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 = {
/**
* Returns the node of the given line number in the given element.
* @param {Element} element A `<pre>` element with line numbers.
* @param {Number} number
* @returns {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];
},
/**
* Resizes the line numbers of the given element.
*
* This function will not add line numbers. It will only resize existing ones.
* @param {Element} element A `<pre>` element with line numbers.
* @returns {void}
*/
resize: function (element) {
_resizeElement(element);
}
};
}());