showdown/src/subParsers/tables.js

showdown.subParser('tables', function (text, options, globals) {
  'use strict';

  var table = function () {

    var tables = {},
        filter;

    tables.th = function (header, style) {
      var id = '';
      header = header.trim();
      if (header === '') {
        return '';
      }
      if (options.tableHeaderId) {
        id = ' id="' + header.replace(/ /g, '_').toLowerCase() + '"';
      }
      header = showdown.subParser('spanGamut')(header, options, globals);
      if (!style || style.trim() === '') {
        style = '';
      } else {
        style = ' style="' + style + '"';
      }
      return '<th' + id + style + '>' + header + '</th>';
    };

    tables.td = function (cell, style) {
      var subText = showdown.subParser('spanGamut')(cell.trim(), options, globals);
      if (!style || style.trim() === '') {
        style = '';
      } else {
        style = ' style="' + style + '"';
      }
      return '<td' + style + '>' + subText + '</td>';
    };

    tables.ths = function () {
      var out = '',
          i = 0,
          hs = [].slice.apply(arguments[0]),
          style = [].slice.apply(arguments[1]);

      for (i; i < hs.length; i += 1) {
        out += tables.th(hs[i], style[i]) + '\n';
      }

      return out;
    };

    tables.tds = function () {
      var out = '',
          i = 0,
          ds = [].slice.apply(arguments[0]),
          style = [].slice.apply(arguments[1]);

      for (i; i < ds.length; i += 1) {
        out += tables.td(ds[i], style[i]) + '\n';
      }
      return out;
    };

    tables.thead = function () {
      var out,
          hs = [].slice.apply(arguments[0]),
          style = [].slice.apply(arguments[1]);

      out = '<thead>\n';
      out += '<tr>\n';
      out += tables.ths.apply(this, [hs, style]);
      out += '</tr>\n';
      out += '</thead>\n';
      return out;
    };

    tables.tr = function () {
      var out,
        cs = [].slice.apply(arguments[0]),
        style = [].slice.apply(arguments[1]);

      out = '<tr>\n';
      out += tables.tds.apply(this, [cs, style]);
      out += '</tr>\n';
      return out;
    };

    filter = function (text) {
      var i = 0,
        lines = text.split('\n'),
        line,
        hs,
        out = [];

      for (i; i < lines.length; i += 1) {
        line = lines[i];
        // looks like a table heading
        if (line.trim().match(/^[|].*[|]$/)) {
          line = line.trim();

          var tbl = [],
              align = lines[i + 1].trim(),
              styles = [],
              j = 0;

          if (align.match(/^[|][-=|: ]+[|]$/)) {
            styles = align.substring(1, align.length - 1).split('|');
            for (j = 0; j < styles.length; ++j) {
              styles[j] = styles[j].trim();
              if (styles[j].match(/^[:][-=| ]+[:]$/)) {
                styles[j] = 'text-align:center;';

              } else if (styles[j].match(/^[-=| ]+[:]$/)) {
                styles[j] = 'text-align:right;';

              } else if (styles[j].match(/^[:][-=| ]+$/)) {
                styles[j] = 'text-align:left;';
              } else {
                styles[j] = '';
              }
            }
          }
          tbl.push('<table>');
          hs = line.substring(1, line.length - 1).split('|');

          if (styles.length === 0) {
            for (j = 0; j < hs.length; ++j) {
              styles.push('text-align:left');
            }
          }
          tbl.push(tables.thead.apply(this, [hs, styles]));
          line = lines[++i];
          if (!line.trim().match(/^[|][-=|: ]+[|]$/)) {
            // not a table rolling back
            line = lines[--i];
          } else {
            line = lines[++i];
            tbl.push('<tbody>');
            while (line.trim().match(/^[|].*[|]$/)) {
              line = line.trim();
              tbl.push(tables.tr.apply(this, [line.substring(1, line.length - 1).split('|'), styles]));
              line = lines[++i];
            }
            tbl.push('</tbody>');
            tbl.push('</table>');
            // we are done with this table and we move along
            out.push(tbl.join('\n'));
            continue;
          }
        }
        out.push(line);
      }
      return out.join('\n');
    };
    return {parse: filter};
  };

  if (options.tables) {
    var tableParser = table();
    return tableParser.parse(text);
  } else {
    return text;
  }
});