(function (Prism) {
  Prism.languages.sass = Prism.languages.extend('css', {
    // Sass comments don't need to be closed, only indented
    comment: {
      pattern: /^([ \t]*)\/[\/*].*(?:(?:\r?\n|\r)\1[ \t].+)*/m,
      lookbehind: true,
      greedy: true,
    },
  });

  Prism.languages.insertBefore('sass', 'atrule', {
    // We want to consume the whole line
    'atrule-line': {
      // Includes support for = and + shortcuts
      pattern: /^(?:[ \t]*)[@+=].+/m,
      greedy: true,
      inside: {
        atrule: /(?:@[\w-]+|[+=])/,
      },
    },
  });
  delete Prism.languages.sass.atrule;

  var variable = /\$[-\w]+|#\{\$[-\w]+\}/;
  var operator = [
    /[+*\/%]|[=!]=|<=?|>=?|\b(?:and|not|or)\b/,
    {
      pattern: /(\s)-(?=\s)/,
      lookbehind: true,
    },
  ];

  Prism.languages.insertBefore('sass', 'property', {
    // We want to consume the whole line
    'variable-line': {
      pattern: /^[ \t]*\$.+/m,
      greedy: true,
      inside: {
        punctuation: /:/,
        variable: variable,
        operator: operator,
      },
    },
    // We want to consume the whole line
    'property-line': {
      pattern: /^[ \t]*(?:[^:\s]+ *:.*|:[^:\s].*)/m,
      greedy: true,
      inside: {
        property: [
          /[^:\s]+(?=\s*:)/,
          {
            pattern: /(:)[^:\s]+/,
            lookbehind: true,
          },
        ],
        punctuation: /:/,
        variable: variable,
        operator: operator,
        important: Prism.languages.sass.important,
      },
    },
  });
  delete Prism.languages.sass.property;
  delete Prism.languages.sass.important;

  // Now that whole lines for other patterns are consumed,
  // what's left should be selectors
  Prism.languages.insertBefore('sass', 'punctuation', {
    selector: {
      pattern:
        /^([ \t]*)\S(?:,[^,\r\n]+|[^,\r\n]*)(?:,[^,\r\n]+)*(?:,(?:\r?\n|\r)\1[ \t]+\S(?:,[^,\r\n]+|[^,\r\n]*)(?:,[^,\r\n]+)*)*/m,
      lookbehind: true,
      greedy: true,
    },
  });
})(Prism);