kmx.io/prism.js/plugins/diff-highlight/prism-diff-highlight.js

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• Hash : 3c61c8f7
  Author :
  Date : 2021-10-14T14:01:11
  

  ESLint: Added `regexp/no-useless-flag` rule (#3150)

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• plugins/diff-highlight/prism-diff-highlight.js

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

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