91 lines
2.8 KiB
JavaScript
91 lines
2.8 KiB
JavaScript
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(function () {
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if (typeof Prism === 'undefined') {
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return;
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}
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var LANGUAGE_REGEX = /^diff-([\w-]+)/i;
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var HTML_TAG = /<\/?(?!\d)[^\s>\/=$<%]+(?:\s(?:\s*[^\s>\/=]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))|(?=[\s/>])))+)?\s*\/?>/g;
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//this will match a line plus the line break while ignoring the line breaks HTML tags may contain.
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var HTML_LINE = RegExp(/(?:__|[^\r\n<])*(?:\r\n?|\n|(?:__|[^\r\n<])(?![^\r\n]))/.source.replace(/__/g, function () { return HTML_TAG.source; }), 'gi');
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var warningLogged = false;
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Prism.hooks.add('before-sanity-check', function (env) {
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var lang = env.language;
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if (LANGUAGE_REGEX.test(lang) && !env.grammar) {
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env.grammar = Prism.languages[lang] = Prism.languages.diff;
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}
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});
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Prism.hooks.add('before-tokenize', function (env) {
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if (!warningLogged && !Prism.languages.diff && !Prism.plugins.autoloader) {
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warningLogged = true;
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console.warn("Prism's Diff Highlight plugin requires the Diff language definition (prism-diff.js)." +
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"Make sure the language definition is loaded or use Prism's Autoloader plugin.");
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}
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var lang = env.language;
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if (LANGUAGE_REGEX.test(lang) && !Prism.languages[lang]) {
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Prism.languages[lang] = Prism.languages.diff;
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}
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});
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Prism.hooks.add('wrap', function (env) {
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var diffLanguage; var diffGrammar;
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if (env.language !== 'diff') {
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var langMatch = LANGUAGE_REGEX.exec(env.language);
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if (!langMatch) {
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return; // not a language specific diff
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}
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diffLanguage = langMatch[1];
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diffGrammar = Prism.languages[diffLanguage];
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}
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var PREFIXES = Prism.languages.diff && Prism.languages.diff.PREFIXES;
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// one of the diff tokens without any nested tokens
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if (PREFIXES && env.type in PREFIXES) {
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/** @type {string} */
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var content = env.content.replace(HTML_TAG, ''); // remove all HTML tags
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/** @type {string} */
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var decoded = content.replace(/</g, '<').replace(/&/g, '&');
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// remove any one-character prefix
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var code = decoded.replace(/(^|[\r\n])./g, '$1');
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// highlight, if possible
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var highlighted;
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if (diffGrammar) {
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highlighted = Prism.highlight(code, diffGrammar, diffLanguage);
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} else {
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highlighted = Prism.util.encode(code);
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}
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// get the HTML source of the prefix token
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var prefixToken = new Prism.Token('prefix', PREFIXES[env.type], [/\w+/.exec(env.type)[0]]);
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var prefix = Prism.Token.stringify(prefixToken, env.language);
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// add prefix
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var lines = []; var m;
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HTML_LINE.lastIndex = 0;
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while ((m = HTML_LINE.exec(highlighted))) {
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lines.push(prefix + m[0]);
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}
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if (/(?:^|[\r\n]).$/.test(decoded)) {
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// because both "+a\n+" and "+a\n" will map to "a\n" after the line prefixes are removed
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lines.push(prefix);
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}
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env.content = lines.join('');
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if (diffGrammar) {
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env.classes.push('language-' + diffLanguage);
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}
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}
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});
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}());
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