prism-file-highlight.js
1.72 KB
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(function () {
if (typeof self === 'undefined' || !self.Prism || !self.document || !document.querySelector) {
return;
}
self.Prism.fileHighlight = function() {
var Extensions = {
'js': 'javascript',
'html': 'markup',
'svg': 'markup',
'xml': 'markup',
'py': 'python',
'rb': 'ruby',
'ps1': 'powershell',
'psm1': 'powershell'
};
if(Array.prototype.forEach) { // Check to prevent error in IE8
Array.prototype.slice.call(document.querySelectorAll('pre[data-src]')).forEach(function (pre) {
var src = pre.getAttribute('data-src');
var language, parent = pre;
var lang = /\blang(?:uage)?-(?!\*)(\w+)\b/i;
while (parent && !lang.test(parent.className)) {
parent = parent.parentNode;
}
if (parent) {
language = (pre.className.match(lang) || [, ''])[1];
}
if (!language) {
var extension = (src.match(/\.(\w+)$/) || [, ''])[1];
language = Extensions[extension] || extension;
}
var code = document.createElement('code');
code.className = 'language-' + language;
pre.textContent = '';
code.textContent = 'Loading…';
pre.appendChild(code);
var xhr = new XMLHttpRequest();
xhr.open('GET', src, true);
xhr.onreadystatechange = function () {
if (xhr.readyState == 4) {
if (xhr.status < 400 && xhr.responseText) {
code.textContent = xhr.responseText;
Prism.highlightElement(code);
}
else if (xhr.status >= 400) {
code.textContent = '✖ Error ' + xhr.status + ' while fetching file: ' + xhr.statusText;
}
else {
code.textContent = '✖ Error: File does not exist or is empty';
}
}
};
xhr.send(null);
});
}
};
self.Prism.fileHighlight();
})();