67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
(function (Prism) {
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var erb_pattern = /<%=?[\s\S]+?%>/g;
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Prism.languages.erb = Prism.languages.extend('markup', {
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'erb': {
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pattern: erb_pattern,
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inside: {
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'delimiter': {
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pattern: /^<%=?|%>$/,
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alias: 'punctuation'
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},
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rest: Prism.languages.ruby
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}
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}
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});
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// Tokenize all inline ERB expressions that are wrapped in <%= %>
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// This allows for easy ERB + markup highlighting
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Prism.hooks.add('before-highlight', function(env) {
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if (env.language !== 'erb') {
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return;
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}
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env.tokenStack = [];
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env.backupCode = env.code;
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env.code = env.code.replace(erb_pattern, function(match) {
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var i = env.tokenStack.length;
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// Check for existing strings
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while (env.backupCode.indexOf('___ERB' + i + '___') !== -1)
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++i;
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// Create a sparse array
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env.tokenStack[i] = match;
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return '___ERB' + i + '___';
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});
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});
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// Restore env.code for other plugins (e.g. line-numbers)
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Prism.hooks.add('before-insert', function(env) {
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if (env.language === 'erb') {
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env.code = env.backupCode;
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delete env.backupCode;
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}
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});
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// Re-insert the tokens after highlighting
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// and highlight them with defined grammar
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Prism.hooks.add('after-highlight', function(env) {
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if (env.language !== 'erb') {
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return;
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}
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for (var i = 0, keys = Object.keys(env.tokenStack); i < keys.length; ++i) {
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var k = keys[i];
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var t = env.tokenStack[k];
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// The replace prevents $$, $&, $`, $', $n, $nn from being interpreted as special patterns
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env.highlightedCode = env.highlightedCode.replace('___ERB' + k + '___', Prism.highlight(t, env.grammar, 'erb').replace(/\$/g, '$$$$'));
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}
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env.element.innerHTML = env.highlightedCode;
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});
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}(Prism)); |