hexo/node_modules/prismjs/plugins/file-highlight/prism-file-highlight.js

196 lines
5.2 KiB
JavaScript

(function () {
if (typeof Prism === 'undefined' || typeof document === 'undefined') {
return;
}
// https://developer.mozilla.org/en-US/docs/Web/API/Element/matches#Polyfill
if (!Element.prototype.matches) {
Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
}
var LOADING_MESSAGE = 'Loading…';
var FAILURE_MESSAGE = function (status, message) {
return '✖ Error ' + status + ' while fetching file: ' + message;
};
var FAILURE_EMPTY_MESSAGE = '✖ Error: File does not exist or is empty';
var EXTENSIONS = {
'js': 'javascript',
'py': 'python',
'rb': 'ruby',
'ps1': 'powershell',
'psm1': 'powershell',
'sh': 'bash',
'bat': 'batch',
'h': 'c',
'tex': 'latex'
};
var STATUS_ATTR = 'data-src-status';
var STATUS_LOADING = 'loading';
var STATUS_LOADED = 'loaded';
var STATUS_FAILED = 'failed';
var SELECTOR = 'pre[data-src]:not([' + STATUS_ATTR + '="' + STATUS_LOADED + '"])'
+ ':not([' + STATUS_ATTR + '="' + STATUS_LOADING + '"])';
/**
* Loads the given file.
*
* @param {string} src The URL or path of the source file to load.
* @param {(result: string) => void} success
* @param {(reason: string) => void} error
*/
function loadFile(src, success, error) {
var xhr = new XMLHttpRequest();
xhr.open('GET', src, true);
xhr.onreadystatechange = function () {
if (xhr.readyState == 4) {
if (xhr.status < 400 && xhr.responseText) {
success(xhr.responseText);
} else {
if (xhr.status >= 400) {
error(FAILURE_MESSAGE(xhr.status, xhr.statusText));
} else {
error(FAILURE_EMPTY_MESSAGE);
}
}
}
};
xhr.send(null);
}
/**
* Parses the given range.
*
* This returns a range with inclusive ends.
*
* @param {string | null | undefined} range
* @returns {[number, number | undefined] | undefined}
*/
function parseRange(range) {
var m = /^\s*(\d+)\s*(?:(,)\s*(?:(\d+)\s*)?)?$/.exec(range || '');
if (m) {
var start = Number(m[1]);
var comma = m[2];
var end = m[3];
if (!comma) {
return [start, start];
}
if (!end) {
return [start, undefined];
}
return [start, Number(end)];
}
return undefined;
}
Prism.hooks.add('before-highlightall', function (env) {
env.selector += ', ' + SELECTOR;
});
Prism.hooks.add('before-sanity-check', function (env) {
var pre = /** @type {HTMLPreElement} */ (env.element);
if (pre.matches(SELECTOR)) {
env.code = ''; // fast-path the whole thing and go to complete
pre.setAttribute(STATUS_ATTR, STATUS_LOADING); // mark as loading
// add code element with loading message
var code = pre.appendChild(document.createElement('CODE'));
code.textContent = LOADING_MESSAGE;
var src = pre.getAttribute('data-src');
var language = env.language;
if (language === 'none') {
// the language might be 'none' because there is no language set;
// in this case, we want to use the extension as the language
var extension = (/\.(\w+)$/.exec(src) || [, 'none'])[1];
language = EXTENSIONS[extension] || extension;
}
// set language classes
Prism.util.setLanguage(code, language);
Prism.util.setLanguage(pre, language);
// preload the language
var autoloader = Prism.plugins.autoloader;
if (autoloader) {
autoloader.loadLanguages(language);
}
// load file
loadFile(
src,
function (text) {
// mark as loaded
pre.setAttribute(STATUS_ATTR, STATUS_LOADED);
// handle data-range
var range = parseRange(pre.getAttribute('data-range'));
if (range) {
var lines = text.split(/\r\n?|\n/g);
// the range is one-based and inclusive on both ends
var start = range[0];
var end = range[1] == null ? lines.length : range[1];
if (start < 0) { start += lines.length; }
start = Math.max(0, Math.min(start - 1, lines.length));
if (end < 0) { end += lines.length; }
end = Math.max(0, Math.min(end, lines.length));
text = lines.slice(start, end).join('\n');
// add data-start for line numbers
if (!pre.hasAttribute('data-start')) {
pre.setAttribute('data-start', String(start + 1));
}
}
// highlight code
code.textContent = text;
Prism.highlightElement(code);
},
function (error) {
// mark as failed
pre.setAttribute(STATUS_ATTR, STATUS_FAILED);
code.textContent = error;
}
);
}
});
Prism.plugins.fileHighlight = {
/**
* Executes the File Highlight plugin for all matching `pre` elements under the given container.
*
* Note: Elements which are already loaded or currently loading will not be touched by this method.
*
* @param {ParentNode} [container=document]
*/
highlight: function highlight(container) {
var elements = (container || document).querySelectorAll(SELECTOR);
for (var i = 0, element; (element = elements[i++]);) {
Prism.highlightElement(element);
}
}
};
var logged = false;
/** @deprecated Use `Prism.plugins.fileHighlight.highlight` instead. */
Prism.fileHighlight = function () {
if (!logged) {
console.warn('Prism.fileHighlight is deprecated. Use `Prism.plugins.fileHighlight.highlight` instead.');
logged = true;
}
Prism.plugins.fileHighlight.highlight.apply(this, arguments);
};
}());