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(function () {
if (typeof self === 'undefined' || !self.Prism || !self.document) {
return;
}
/**
* Class name for <pre> which is activating the plugin
* @type {String}
*/
var PLUGIN_CLASS = 'line-numbers';
/**
* 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 = element.textContent.split('\n');
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_CLASS), _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(/\n(?!$)/g);
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);
});
}());
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