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/* FIXME :
 :extend() is not handled specifically : its highlighting is buggy.
 Mixin usage must be inside a ruleset to be highlighted.
 At-rules (e.g. import) containing interpolations are buggy.
 Detached rulesets are highlighted as at-rules.
 A comment before a mixin usage prevents the latter to be properly highlighted.
 */

Prism.languages.less = Prism.languages.extend('css', {
	'comment': [
		/\/\*[\s\S]*?\*\//,
		{
			pattern: /(^|[^\\])\/\/.*/,
			lookbehind: true
		}
	],
	'atrule': {
		pattern: /@[\w-]+?(?:\([^{}]+\)|[^(){};])*?(?=\s*\{)/i,
		inside: {
			'punctuation': /[:()]/
		}
	},
	// selectors and mixins are considered the same
	'selector': {
		pattern: /(?:@\{[\w-]+\}|[^{};\s@])(?:@\{[\w-]+\}|\([^{}]*\)|[^{};@])*?(?=\s*\{)/,
		inside: {
			// mixin parameters
			'variable': /@+[\w-]+/
		}
	},

	'property': /(?:@\{[\w-]+\}|[\w-])+(?:\+_?)?(?=\s*:)/i,
	'punctuation': /[{}();:,]/,
	'operator': /[+\-*\/]/
});

// Invert function and punctuation positions
Prism.languages.insertBefore('less', 'punctuation', {
	'function': Prism.languages.less.function
});

Prism.languages.insertBefore('less', 'property', {
	'variable': [
		// Variable declaration (the colon must be consumed!)
		{
			pattern: /@[\w-]+\s*:/,
			inside: {
				"punctuation": /:/
			}
		},

		// Variable usage
		/@@?[\w-]+/
	],
	'mixin-usage': {
		pattern: /([{;]\s*)[.#](?!\d)[\w-]+.*?(?=[(;])/,
		lookbehind: true,
		alias: 'function'
	}
});