Prism.languages.scss = Prism.languages.extend('css', {
	'comment': {
		pattern: /(^|[^\\])(\/\*[\w\W]*?\*\/|\/\/.*?(\r?\n|$))/g,
		lookbehind: true
	},
	// aturle is just the @***, not the entire rule (to highlight var & stuffs)
	// + add ability to highlight number & unit for media queries
	'atrule': /@[\w-]+(?=\s+(\(|\{|;))/gi,
	// url, compassified
	'url': /([-a-z]+-)*url(?=\()/gi,
	// CSS selector regex is not appropriate for Sass
	// since there can be lot more things (var, @ directive, nesting..)
	// a selector must start at the end of a property or after a brace (end of other rules or nesting)
	// it can contain some caracters that aren't used for defining rules or end of selector, & (parent selector), or interpolated variable
	// the end of a selector is found when there is no rules in it ( {} or {\s}) or if there is a property (because an interpolated var
	// can "pass" as a selector- e.g: proper#{$erty})
	// this one was ard to do, so please be careful if you edit this one :)
	'selector': /([^@;\{\}\(\)]?([^@;\{\}\(\)]|&|\#\{\$[-_\w]+\})+)(?=\s*\{(\}|\s|[^\}]+(:|\{)[^\}]+))/gm
});

Prism.languages.insertBefore('scss', 'atrule', {
	'keyword': /@(if|else if|else|for|each|while|import|extend|debug|warn|mixin|include|function|return|content)|(?=@for\s+\$[-_\w]+\s)+from/i
});

Prism.languages.insertBefore('scss', 'property', {
	// var and interpolated vars
	'variable': /((\$[-_\w]+)|(#\{\$[-_\w]+\}))/i
});

Prism.languages.insertBefore('scss', 'ignore', {
	'placeholder': /%[-_\w]+/i,
	'statement': /\B!(default|optional)\b/gi,
	'boolean': /\b(true|false)\b/g,
	'null': /\b(null)\b/g,
	'operator': /\s+([-+]{1,2}|={1,2}|!=|\|?\||\?|\*|\/|\%)\s+/g
});
