Clean

Highlight/languages/yaml.js

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+/*
+Language: YAML
+Author: Stefan Wienert <stwienert@gmail.com>
+Requires: ruby.js
+Description: YAML (Yet Another Markdown Language)
+Category: config
+*/
+function(hljs) {
+  var LITERALS = 'true false yes no null';
+
+  var keyPrefix = '^[ \\-]*';
+  var keyName =  '[a-zA-Z_][\\w\\-]*';
+  var KEY = {
+    className: 'attr',
+    variants: [
+      { begin: keyPrefix + keyName + ":"},
+      { begin: keyPrefix + '"' + keyName + '"' + ":"},
+      { begin: keyPrefix + "'" + keyName + "'" + ":"}
+    ]
+  };
+
+  var TEMPLATE_VARIABLES = {
+    className: 'template-variable',
+    variants: [
+      { begin: '\{\{', end: '\}\}' }, // jinja templates Ansible
+      { begin: '%\{', end: '\}' } // Ruby i18n
+    ]
+  };
+  var STRING = {
+    className: 'string',
+    relevance: 0,
+    variants: [
+      {begin: /'/, end: /'/},
+      {begin: /"/, end: /"/},
+      {begin: /\S+/}
+    ],
+    contains: [
+      hljs.BACKSLASH_ESCAPE,
+      TEMPLATE_VARIABLES
+    ]
+  };
+
+  return {
+    case_insensitive: true,
+    aliases: ['yml', 'YAML', 'yaml'],
+    contains: [
+      KEY,
+      {
+        className: 'meta',
+        begin: '^---\s*$',
+        relevance: 10
+      },
+      { // multi line string
+        className: 'string',
+        begin: '[\\|>] *$',
+        returnEnd: true,
+        contains: STRING.contains,
+        // very simple termination: next hash key
+        end: KEY.variants[0].begin
+      },
+      { // Ruby/Rails erb
+        begin: '<%[%=-]?', end: '[%-]?%>',
+        subLanguage: 'ruby',
+        excludeBegin: true,
+        excludeEnd: true,
+        relevance: 0
+      },
+      { // data type
+        className: 'type',
+        begin: '!!' + hljs.UNDERSCORE_IDENT_RE,
+      },
+      { // fragment id &ref
+        className: 'meta',
+        begin: '&' + hljs.UNDERSCORE_IDENT_RE + '$',
+      },
+      { // fragment reference *ref
+        className: 'meta',
+        begin: '\\*' + hljs.UNDERSCORE_IDENT_RE + '$'
+      },
+      { // array listing
+        className: 'bullet',
+        begin: '^ *-',
+        relevance: 0
+      },
+      hljs.HASH_COMMENT_MODE,
+      {
+        beginKeywords: LITERALS,
+        keywords: {literal: LITERALS}
+      },
+      hljs.C_NUMBER_MODE,
+      STRING
+    ]
+  };
+}