yaml.js
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	/*
	Language: YAML
	Description: Yet Another Markdown Language
	Author: Stefan Wienert <stwienert@gmail.com>
	Contributors: Carl Baxter <carl@cbax.tech>
	Requires: ruby.js
	Website: https://yaml.org
	Category: common, config
	*/
	function yaml(hljs) {
	const LITERALS = 'true false yes no null';

	// YAML spec allows non-reserved URI characters in tags.
	const URI_CHARACTERS = '[\\w#;/?:@&=+$,.~*\'()[\\]]+';

	// Define keys as starting with a word character
	// ...containing word chars, spaces, colons, forward-slashes, hyphens and periods
	// ...and ending with a colon followed immediately by a space, tab or newline.
	// The YAML spec allows for much more than this, but this covers most use-cases.
	const KEY = {
	className: 'attr',
	variants: [
	{ begin: '\\w[\\w :\\/.-]*:(?=[ \t]\|$)' },
	{ // double quoted keys
	begin: '"\\w[\\w :\\/.-]*":(?=[ \t]\|$)' },
	{ // single quoted keys
	begin: '\'\\w[\\w :\\/.-]*\':(?=[ \t]\|$)' }
	]
	};

	const TEMPLATE_VARIABLES = {
	className: 'template-variable',
	variants: [
	{ // jinja templates Ansible
	begin: /\{\{/,
	end: /\}\}/
	},
	{ // Ruby i18n
	begin: /%\{/,
	end: /\}/
	}
	]
	};
	const STRING = {
	className: 'string',
	relevance: 0,
	variants: [
	{
	begin: /'/,
	end: /'/
	},
	{
	begin: /"/,
	end: /"/
	},
	{ begin: /\S+/ }
	],
	contains: [
	hljs.BACKSLASH_ESCAPE,
	TEMPLATE_VARIABLES
	]
	};

	// Strings inside of value containers (objects) can't contain braces,
	// brackets, or commas
	const CONTAINER_STRING = hljs.inherit(STRING, { variants: [
	{
	begin: /'/,
	end: /'/
	},
	{
	begin: /"/,
	end: /"/
	},
	{ begin: /[^\s,{}[\]]+/ }
	] });

	const DATE_RE = '[0-9]{4}(-[0-9][0-9]){0,2}';
	const TIME_RE = '([Tt \\t][0-9][0-9]?(:[0-9][0-9]){2})?';
	const FRACTION_RE = '(\\.[0-9]*)?';
	const ZONE_RE = '([ \\t])*(Z\|[-+][0-9][0-9]?(:[0-9][0-9])?)?';
	const TIMESTAMP = {
	className: 'number',
	begin: '\\b' + DATE_RE + TIME_RE + FRACTION_RE + ZONE_RE + '\\b'
	};

	const VALUE_CONTAINER = {
	end: ',',
	endsWithParent: true,
	excludeEnd: true,
	keywords: LITERALS,
	relevance: 0
	};
	const OBJECT = {
	begin: /\{/,
	end: /\}/,
	contains: [ VALUE_CONTAINER ],
	illegal: '\\n',
	relevance: 0
	};
	const ARRAY = {
	begin: '\\[',
	end: '\\]',
	contains: [ VALUE_CONTAINER ],
	illegal: '\\n',
	relevance: 0
	};

	const MODES = [
	KEY,
	{
	className: 'meta',
	begin: '^---\\s*$',
	relevance: 10
	},
	{ // multi line string
	// Blocks start with a \| or > followed by a newline
	//
	// Indentation of subsequent lines must be the same to
	// be considered part of the block
	className: 'string',
	begin: '[\\\|>]([1-9]?[+-])?[ ]\\n( +)[^ ][^\\n]\\n(\\2[^\\n]+\\n?)*'
	},
	{ // Ruby/Rails erb
	begin: '<%[%=-]?',
	end: '[%-]?%>',
	subLanguage: 'ruby',
	excludeBegin: true,
	excludeEnd: true,
	relevance: 0
	},
	{ // named tags
	className: 'type',
	begin: '!\\w+!' + URI_CHARACTERS
	},
	// https://yaml.org/spec/1.2/spec.html#id2784064
	{ // verbatim tags
	className: 'type',
	begin: '!<' + URI_CHARACTERS + ">"
	},
	{ // primary tags
	className: 'type',
	begin: '!' + URI_CHARACTERS
	},
	{ // secondary tags
	className: 'type',
	begin: '!!' + URI_CHARACTERS
	},
	{ // fragment id &ref
	className: 'meta',
	begin: '&' + hljs.UNDERSCORE_IDENT_RE + '$'
	},
	{ // fragment reference *ref
	className: 'meta',
	begin: '\\*' + hljs.UNDERSCORE_IDENT_RE + '$'
	},
	{ // array listing
	className: 'bullet',
	// TODO: remove \|$ hack when we have proper look-ahead support
	begin: '-(?=[ ]\|$)',
	relevance: 0
	},
	hljs.HASH_COMMENT_MODE,
	{
	beginKeywords: LITERALS,
	keywords: { literal: LITERALS }
	},
	TIMESTAMP,
	// numbers are any valid C-style number that
	// sit isolated from other words
	{
	className: 'number',
	begin: hljs.C_NUMBER_RE + '\\b',
	relevance: 0
	},
	OBJECT,
	ARRAY,
	STRING
	];

	const VALUE_MODES = [ ...MODES ];
	VALUE_MODES.pop();
	VALUE_MODES.push(CONTAINER_STRING);
	VALUE_CONTAINER.contains = VALUE_MODES;

	return {
	name: 'YAML',
	case_insensitive: true,
	aliases: [ 'yml' ],
	contains: MODES
	};
	}

	module.exports = yaml;

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