'use strict'

module.exports = scss
scss.displayName = 'scss'
scss.aliases = []
function scss(Prism) {
  Prism.languages.scss = Prism.languages.extend('css', {
    comment: {
      pattern: /(^|[^\\])(?:\/\*[\s\S]*?\*\/|\/\/.*)/,
      lookbehind: true
    },
    atrule: {
      pattern: /@[\w-](?:\([^()]+\)|[^()\s]|\s+(?!\s))*?(?=\s+[{;])/,
      inside: {
        rule: /@[\w-]+/ // See rest below
      }
    },
    // url, compassified
    url: /(?:[-a-z]+-)?url(?=\()/i,
    // 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 characters 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 hard to do, so please be careful if you edit this one :)
    selector: {
      // Initial look-ahead is used to prevent matching of blank selectors
      pattern:
        /(?=\S)[^@;{}()]?(?:[^@;{}()\s]|\s+(?!\s)|#\{\$[-\w]+\})+(?=\s*\{(?:\}|\s|[^}][^:{}]*[:{][^}]))/,
      inside: {
        parent: {
          pattern: /&/,
          alias: 'important'
        },
        placeholder: /%[-\w]+/,
        variable: /\$[-\w]+|#\{\$[-\w]+\}/
      }
    },
    property: {
      pattern: /(?:[-\w]|\$[-\w]|#\{\$[-\w]+\})+(?=\s*:)/,
      inside: {
        variable: /\$[-\w]+|#\{\$[-\w]+\}/
      }
    }
  })
  Prism.languages.insertBefore('scss', 'atrule', {
    keyword: [
      /@(?:content|debug|each|else(?: if)?|extend|for|forward|function|if|import|include|mixin|return|use|warn|while)\b/i,
      {
        pattern: /( )(?:from|through)(?= )/,
        lookbehind: true
      }
    ]
  })
  Prism.languages.insertBefore('scss', 'important', {
    // var and interpolated vars
    variable: /\$[-\w]+|#\{\$[-\w]+\}/
  })
  Prism.languages.insertBefore('scss', 'function', {
    'module-modifier': {
      pattern: /\b(?:as|hide|show|with)\b/i,
      alias: 'keyword'
    },
    placeholder: {
      pattern: /%[-\w]+/,
      alias: 'selector'
    },
    statement: {
      pattern: /\B!(?:default|optional)\b/i,
      alias: 'keyword'
    },
    boolean: /\b(?:false|true)\b/,
    null: {
      pattern: /\bnull\b/,
      alias: 'keyword'
    },
    operator: {
      pattern: /(\s)(?:[-+*\/%]|[=!]=|<=?|>=?|and|not|or)(?=\s)/,
      lookbehind: true
    }
  })
  Prism.languages.scss['atrule'].inside.rest = Prism.languages.scss
}