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110 lines
2.7 KiB
JavaScript
110 lines
2.7 KiB
JavaScript
(function(){
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if(!window.Prism) {
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return;
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}
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function $$(expr, con) {
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return Array.prototype.slice.call((con || document).querySelectorAll(expr));
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}
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function hasClass(element, className) {
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className = " " + className + " ";
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return (" " + element.className + " ").replace(/[\n\t]/g, " ").indexOf(className) > -1
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}
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var CRLF = crlf = /\r?\n|\r/g;
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function highlightLines(pre, lines, classes) {
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var ranges = lines.replace(/\s+/g, '').split(','),
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offset = +pre.getAttribute('data-line-offset') || 0;
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var lineHeight = parseFloat(getComputedStyle(pre).lineHeight);
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for (var i=0, range; range = ranges[i++];) {
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range = range.split('-');
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var start = +range[0],
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end = +range[1] || start;
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var line = document.createElement('div');
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line.textContent = Array(end - start + 2).join(' \r\n');
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line.className = (classes || '') + ' line-highlight';
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//if the line-numbers plugin is enabled, then there is no reason for this plugin to display the line numbers
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if(!hasClass(pre, 'line-numbers')) {
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line.setAttribute('data-start', start);
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if(end > start) {
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line.setAttribute('data-end', end);
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}
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}
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line.style.top = (start - offset - 1) * lineHeight + 'px';
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//allow this to play nicely with the line-numbers plugin
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if(hasClass(pre, 'line-numbers')) {
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//need to attack to pre as when line-numbers is enabled, the code tag is relatively which screws up the positioning
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pre.appendChild(line);
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} else {
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(pre.querySelector('code') || pre).appendChild(line);
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}
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}
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}
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function applyHash() {
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var hash = location.hash.slice(1);
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// Remove pre-existing temporary lines
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$$('.temporary.line-highlight').forEach(function (line) {
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line.parentNode.removeChild(line);
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});
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var range = (hash.match(/\.([\d,-]+)$/) || [,''])[1];
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if (!range || document.getElementById(hash)) {
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return;
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}
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var id = hash.slice(0, hash.lastIndexOf('.')),
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pre = document.getElementById(id);
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if (!pre) {
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return;
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}
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if (!pre.hasAttribute('data-line')) {
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pre.setAttribute('data-line', '');
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}
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highlightLines(pre, range, 'temporary ');
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document.querySelector('.temporary.line-highlight').scrollIntoView();
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}
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var fakeTimer = 0; // Hack to limit the number of times applyHash() runs
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Prism.hooks.add('after-highlight', function(env) {
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var pre = env.element.parentNode;
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var lines = pre && pre.getAttribute('data-line');
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if (!pre || !lines || !/pre/i.test(pre.nodeName)) {
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return;
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}
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clearTimeout(fakeTimer);
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$$('.line-highlight', pre).forEach(function (line) {
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line.parentNode.removeChild(line);
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});
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highlightLines(pre, lines);
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fakeTimer = setTimeout(applyHash, 1);
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});
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addEventListener('hashchange', applyHash);
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})();
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