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/* TODO
	Add support for variables inside double quoted strings
	Add support for {php}
*/

(function(Prism) {

	var smarty_pattern = /\{\*[\s\S]+?\*\}|\{[\s\S]+?\}/g;
	var smarty_litteral_start = '{literal}';
	var smarty_litteral_end = '{/literal}';
	var smarty_litteral_mode = false;

	Prism.languages.smarty = Prism.languages.extend('markup', {
		'smarty': {
			pattern: smarty_pattern,
			inside: {
				'delimiter': {
					pattern: /^\{|\}$/i,
					alias: 'punctuation'
				},
				'string': /(["'])(?:\\?.)*?\1/,
				'number': /\b-?(?:0x[\dA-Fa-f]+|\d*\.?\d+(?:[Ee][-+]?\d+)?)\b/,
				'variable': [
					/\$(?!\d)\w+/,
					/#(?!\d)\w+#/,
					{
						pattern: /(\.|->)(?!\d)\w+/,
						lookbehind: true
					},
					{
						pattern: /(\[)(?!\d)\w+(?=\])/,
						lookbehind: true
					}
				],
				'function': [
					{
						pattern: /(\|\s*)@?(?!\d)\w+/,
						lookbehind: true
					},
					/^\/?(?!\d)\w+/,
					/(?!\d)\w+(?=\()/
				],
				'attr-name': {
					// Value is made optional because it may have already been tokenized
					pattern: /\w+\s*=\s*(?:(?!\d)\w+)?/,
					inside: {
						"variable": {
							pattern: /(=\s*)(?!\d)\w+/,
							lookbehind: true
						},
						"operator": /=/
					}
				},
				'punctuation': [
					/[\[\]().,:`]|\->/
				],
				'operator': [
					/[+\-*\/%]|==?=?|[!<>]=?|&&|\|\|?/,
					/\bis\s+(?:not\s+)?(?:div|even|odd)(?:\s+by)?\b/,
					/\b(?:eq|neq?|gt|lt|gt?e|lt?e|not|mod|or|and)\b/
				],
				'keyword': /\b(?:false|off|on|no|true|yes)\b/
			}
		}
	});

	// Comments are inserted at top so that they can
	// surround markup
	Prism.languages.insertBefore('smarty', 'tag', {
		'smarty-comment': {
			pattern: /\{\*[\s\S]*?\*\}/,
			alias: ['smarty','comment']
		}
	});

	// Tokenize all inline Smarty expressions
	Prism.hooks.add('before-highlight', function(env) {
		if (env.language !== 'smarty') {
			return;
		}

		env.tokenStack = [];

		env.backupCode = env.code;
		env.code = env.code.replace(smarty_pattern, function(match) {

			// Smarty tags inside {literal} block are ignored
			if(match === smarty_litteral_end) {
				smarty_litteral_mode = false;
			}

			if(!smarty_litteral_mode) {
				if(match === smarty_litteral_start) {
					smarty_litteral_mode = true;
				}

				var i = env.tokenStack.length;
				// Check for existing strings
				while (env.backupCode.indexOf('___SMARTY' + i + '___') !== -1)
					++i;

				// Create a sparse array
				env.tokenStack[i] = match;

				return '___SMARTY' + i + '___';
			}
			return match;
		});
	});

	// Restore env.code for other plugins (e.g. line-numbers)
	Prism.hooks.add('before-insert', function(env) {
		if (env.language === 'smarty') {
			env.code = env.backupCode;
			delete env.backupCode;
		}
	});

	// Re-insert the tokens after highlighting
	// and highlight them with defined grammar
	Prism.hooks.add('after-highlight', function(env) {
		if (env.language !== 'smarty') {
			return;
		}

		for (var i = 0, keys = Object.keys(env.tokenStack); i < keys.length; ++i) {
			var k = keys[i];
			var t = env.tokenStack[k];

			// The replace prevents $$, $&, $`, $', $n, $nn from being interpreted as special patterns
			env.highlightedCode = env.highlightedCode.replace('___SMARTY' + k + '___', Prism.highlight(t, env.grammar, 'smarty').replace(/\$/g, '$$$$'));
		}

		env.element.innerHTML = env.highlightedCode;
	});

}(Prism));