/* TODO
	Handle multiline code after tag
	    %foo= some |
			multiline |
			code |
*/

(function(Prism) {
  Prism.languages.haml = {
    // Multiline stuff should appear before the rest

    'multiline-comment': {
      pattern: /((?:^|\r?\n|\r)([\t ]*))(?:\/|-#).*(?:(?:\r?\n|\r)\2[\t ]+.+)*/,
      lookbehind: true,
      alias: 'comment',
    },

    'multiline-code': [
      {
        pattern: /((?:^|\r?\n|\r)([\t ]*)(?:[~-]|[&!]?=)).*,[\t ]*(?:(?:\r?\n|\r)\2[\t ]+.*,[\t ]*)*(?:(?:\r?\n|\r)\2[\t ]+.+)/,
        lookbehind: true,
        inside: {
          rest: Prism.languages.ruby,
        },
      },
      {
        pattern: /((?:^|\r?\n|\r)([\t ]*)(?:[~-]|[&!]?=)).*\|[\t ]*(?:(?:\r?\n|\r)\2[\t ]+.*\|[\t ]*)*/,
        lookbehind: true,
        inside: {
          rest: Prism.languages.ruby,
        },
      },
    ],

    // See at the end of the file for known filters
    filter: {
      pattern: /((?:^|\r?\n|\r)([\t ]*)):[\w-]+(?:(?:\r?\n|\r)(?:\2[\t ]+.+|\s*?(?=\r?\n|\r)))+/,
      lookbehind: true,
      inside: {
        'filter-name': {
          pattern: /^:[\w-]+/,
          alias: 'variable',
        },
      },
    },

    markup: {
      pattern: /((?:^|\r?\n|\r)[\t ]*)<.+/,
      lookbehind: true,
      inside: {
        rest: Prism.languages.markup,
      },
    },
    doctype: {
      pattern: /((?:^|\r?\n|\r)[\t ]*)!!!(?: .+)?/,
      lookbehind: true,
    },
    tag: {
      // Allows for one nested group of braces
      pattern: /((?:^|\r?\n|\r)[\t ]*)[%.#][\w\-#.]*[\w\-](?:\([^)]+\)|\{(?:\{[^}]+\}|[^}])+\}|\[[^\]]+\])*[\/<>]*/,
      lookbehind: true,
      inside: {
        attributes: [
          {
            // Lookbehind tries to prevent interpolations from breaking it all
            // Allows for one nested group of braces
            pattern: /(^|[^#])\{(?:\{[^}]+\}|[^}])+\}/,
            lookbehind: true,
            inside: {
              rest: Prism.languages.ruby,
            },
          },
          {
            pattern: /\([^)]+\)/,
            inside: {
              'attr-value': {
                pattern: /(=\s*)(?:"(?:\\.|[^\\"\r\n])*"|[^)\s]+)/,
                lookbehind: true,
              },
              'attr-name': /[\w:-]+(?=\s*!?=|\s*[,)])/,
              punctuation: /[=(),]/,
            },
          },
          {
            pattern: /\[[^\]]+\]/,
            inside: {
              rest: Prism.languages.ruby,
            },
          },
        ],
        punctuation: /[<>]/,
      },
    },
    code: {
      pattern: /((?:^|\r?\n|\r)[\t ]*(?:[~-]|[&!]?=)).+/,
      lookbehind: true,
      inside: {
        rest: Prism.languages.ruby,
      },
    },
    // Interpolations in plain text
    interpolation: {
      pattern: /#\{[^}]+\}/,
      inside: {
        delimiter: {
          pattern: /^#\{|\}$/,
          alias: 'punctuation',
        },
        rest: Prism.languages.ruby,
      },
    },
    punctuation: {
      pattern: /((?:^|\r?\n|\r)[\t ]*)[~=\-&!]+/,
      lookbehind: true,
    },
  };

  var filter_pattern =
    '((?:^|\\r?\\n|\\r)([\\t ]*)):{{filter_name}}(?:(?:\\r?\\n|\\r)(?:\\2[\\t ]+.+|\\s*?(?=\\r?\\n|\\r)))+';

  // Non exhaustive list of available filters and associated languages
  var filters = [
    'css',
    { filter: 'coffee', language: 'coffeescript' },
    'erb',
    'javascript',
    'less',
    'markdown',
    'ruby',
    'scss',
    'textile',
  ];
  var all_filters = {};
  for (var i = 0, l = filters.length; i < l; i++) {
    var filter = filters[i];
    filter =
      typeof filter === 'string'
        ? { filter: filter, language: filter }
        : filter;
    if (Prism.languages[filter.language]) {
      all_filters['filter-' + filter.filter] = {
        pattern: RegExp(
          filter_pattern.replace('{{filter_name}}', filter.filter)
        ),
        lookbehind: true,
        inside: {
          'filter-name': {
            pattern: /^:[\w-]+/,
            alias: 'variable',
          },
          rest: Prism.languages[filter.language],
        },
      };
    }
  }

  Prism.languages.insertBefore('haml', 'filter', all_filters);
})(Prism);
