(function (Prism) {
	var variable = /\$\w+|%[a-z]+%/;

	var arrowAttr = /\[[^[\]]*\]/.source;
	var arrowDirection = /(?:[drlu]|do|down|le|left|ri|right|up)/.source;
	var arrowBody = '(?:-+' + arrowDirection + '-+|\\.+' + arrowDirection + '\\.+|-+(?:' + arrowAttr + '-*)?|' + arrowAttr + '-+|\\.+(?:' + arrowAttr + '\\.*)?|' + arrowAttr + '\\.+)';
	var arrowLeft = /(?:<{1,2}|\/{1,2}|\\{1,2}|<\||[#*^+}xo])/.source;
	var arrowRight = /(?:>{1,2}|\/{1,2}|\\{1,2}|\|>|[#*^+{xo])/.source;
	var arrowPrefix = /[[?]?[ox]?/.source;
	var arrowSuffix = /[ox]?[\]?]?/.source;
	var arrow =
		arrowPrefix +
		'(?:' +
		arrowBody + arrowRight +
		'|' +
		arrowLeft + arrowBody + '(?:' + arrowRight + ')?' +
		')' +
		arrowSuffix;

	Prism.languages['plant-uml'] = {
		'comment': {
			pattern: /(^[ \t]*)(?:'.*|\/'[\s\S]*?'\/)/m,
			lookbehind: true,
			greedy: true
		},
		'preprocessor': {
			pattern: /(^[ \t]*)!.*/m,
			lookbehind: true,
			greedy: true,
			alias: 'property',
			inside: {
				'variable': variable
			}
		},
		'delimiter': {
			pattern: /(^[ \t]*)@(?:end|start)uml\b/m,
			lookbehind: true,
			greedy: true,
			alias: 'punctuation'
		},

		'arrow': {
			pattern: RegExp(/(^|[^-.<>?|\\[\]ox])/.source + arrow + /(?![-.<>?|\\\]ox])/.source),
			lookbehind: true,
			greedy: true,
			alias: 'operator',
			inside: {
				'expression': {
					pattern: /(\[)[^[\]]+(?=\])/,
					lookbehind: true,
					inside: null // see below
				},
				'punctuation': /\[(?=$|\])|^\]/
			}
		},

		'string': {
			pattern: /"[^"]*"/,
			greedy: true
		},
		'text': {
			pattern: /(\[[ \t]*[\r\n]+(?![\r\n]))[^\]]*(?=\])/,
			lookbehind: true,
			greedy: true,
			alias: 'string'
		},

		'keyword': [
			{
				pattern: /^([ \t]*)(?:abstract\s+class|end\s+(?:box|fork|group|merge|note|ref|split|title)|(?:fork|split)(?:\s+again)?|activate|actor|agent|alt|annotation|artifact|autoactivate|autonumber|backward|binary|boundary|box|break|caption|card|case|circle|class|clock|cloud|collections|component|concise|control|create|critical|database|deactivate|destroy|detach|diamond|else|elseif|end|end[hr]note|endif|endswitch|endwhile|entity|enum|file|folder|footer|frame|group|[hr]?note|header|hexagon|hide|if|interface|label|legend|loop|map|namespace|network|newpage|node|nwdiag|object|opt|package|page|par|participant|person|queue|rectangle|ref|remove|repeat|restore|return|robust|scale|set|show|skinparam|stack|start|state|stop|storage|switch|title|together|usecase|usecase\/|while)(?=\s|$)/m,
				lookbehind: true,
				greedy: true
			},
			/\b(?:elseif|equals|not|while)(?=\s*\()/,
			/\b(?:as|is|then)\b/
		],

		'divider': {
			pattern: /^==.+==$/m,
			greedy: true,
			alias: 'important'
		},

		'time': {
			pattern: /@(?:\d+(?:[:/]\d+){2}|[+-]?\d+|:[a-z]\w*(?:[+-]\d+)?)\b/i,
			greedy: true,
			alias: 'number'
		},

		'color': {
			pattern: /#(?:[a-z_]+|[a-fA-F0-9]+)\b/,
			alias: 'symbol'
		},
		'variable': variable,

		'punctuation': /[:,;()[\]{}]|\.{3}/
	};

	Prism.languages['plant-uml'].arrow.inside.expression.inside = Prism.languages['plant-uml'];

	Prism.languages['plantuml'] = Prism.languages['plant-uml'];

}(Prism));