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prism-line-numbers.js
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prism-line-numbers.js
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(function () {
if (typeof Prism === 'undefined' || typeof document === 'undefined') {
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;
/**
* Global exports
*/
var config = Prism.plugins.lineNumbers = {
/**
* Get node for provided line number
*
* @param {Element} element pre element
* @param {number} number line 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');
if (!lineNumberRows) {
return;
}
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 {HTMLElement} element A `<pre>` element with line numbers.
* @returns {void}
*/
resize: function (element) {
resizeElements([element]);
},
/**
* Whether the plugin can assume that the units font sizes and margins are not depended on the size of
* the current viewport.
*
* Setting this to `true` will allow the plugin to do certain optimizations for better performance.
*
* Set this to `false` if you use any of the following CSS units: `vh`, `vw`, `vmin`, `vmax`.
*
* @type {boolean}
*/
assumeViewportIndependence: true
};
/**
* Resizes the given elements.
*
* @param {HTMLElement[]} elements
*/
function resizeElements(elements) {
elements = elements.filter(function (e) {
var codeStyles = getStyles(e);
var whiteSpace = codeStyles['white-space'];
return whiteSpace === 'pre-wrap' || whiteSpace === 'pre-line';
});
if (elements.length == 0) {
return;
}
var infos = elements.map(function (element) {
var codeElement = element.querySelector('code');
var lineNumbersWrapper = element.querySelector('.line-numbers-rows');
if (!codeElement || !lineNumbersWrapper) {
return undefined;
}
/** @type {HTMLElement} */
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.innerHTML = '0';
lineNumberSizer.style.display = 'block';
var oneLinerHeight = lineNumberSizer.getBoundingClientRect().height;
lineNumberSizer.innerHTML = '';
return {
element: element,
lines: codeLines,
lineHeights: [],
oneLinerHeight: oneLinerHeight,
sizer: lineNumberSizer,
};
}).filter(Boolean);
infos.forEach(function (info) {
var lineNumberSizer = info.sizer;
var lines = info.lines;
var lineHeights = info.lineHeights;
var oneLinerHeight = info.oneLinerHeight;
lineHeights[lines.length - 1] = undefined;
lines.forEach(function (line, index) {
if (line && line.length > 1) {
var e = lineNumberSizer.appendChild(document.createElement('span'));
e.style.display = 'block';
e.textContent = line;
} else {
lineHeights[index] = oneLinerHeight;
}
});
});
infos.forEach(function (info) {
var lineNumberSizer = info.sizer;
var lineHeights = info.lineHeights;
var childIndex = 0;
for (var i = 0; i < lineHeights.length; i++) {
if (lineHeights[i] === undefined) {
lineHeights[i] = lineNumberSizer.children[childIndex++].getBoundingClientRect().height;
}
}
});
infos.forEach(function (info) {
var lineNumberSizer = info.sizer;
var wrapper = info.element.querySelector('.line-numbers-rows');
lineNumberSizer.style.display = 'none';
lineNumberSizer.innerHTML = '';
info.lineHeights.forEach(function (height, lineNumber) {
wrapper.children[lineNumber].style.height = height + 'px';
});
});
}
/**
* Returns style declarations for the element
*
* @param {Element} element
*/
function getStyles(element) {
if (!element) {
return null;
}
return window.getComputedStyle ? getComputedStyle(element) : (element.currentStyle || null);
}
var lastWidth = undefined;
window.addEventListener('resize', function () {
if (config.assumeViewportIndependence && lastWidth === window.innerWidth) {
return;
}
lastWidth = window.innerWidth;
resizeElements(Array.prototype.slice.call(document.querySelectorAll('pre.' + PLUGIN_NAME)));
});
Prism.hooks.add('complete', function (env) {
if (!env.code) {
return;
}
var code = /** @type {Element} */ (env.element);
var pre = /** @type {HTMLElement} */ (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;
}
// only add line numbers if <code> or one of its ancestors has the `line-numbers` class
if (!Prism.util.isActive(code, PLUGIN_NAME)) {
return;
}
// Remove the class 'line-numbers' from the <code>
code.classList.remove(PLUGIN_NAME);
// Add the class 'line-numbers' to the <pre>
pre.classList.add(PLUGIN_NAME);
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);
resizeElements([pre]);
Prism.hooks.run('line-numbers', env);
});
Prism.hooks.add('line-numbers', function (env) {
env.plugins = env.plugins || {};
env.plugins.lineNumbers = true;
});
}());