showdown/src/subParsers/makeMarkdown/table.js

A Markdown to HTML converter written in Javascript

showdown.subParser('makeMarkdown.table', function (node, globals) {
  'use strict';

  var txt = '',
      tableArray = [[], []],
      headings   = node.querySelectorAll('thead>tr>th'),
      rows       = node.querySelectorAll('tbody>tr'),
      i, ii;
  for (i = 0; i < headings.length; ++i) {
    var headContent = showdown.subParser('makeMarkdown.tableCell')(headings[i], globals),
        allign = '---';

    if (headings[i].hasAttribute('style')) {
      var style = headings[i].getAttribute('style').toLowerCase().replace(/\s/g, '');
      switch (style) {
        case 'text-align:left;':
          allign = ':---';
          break;
        case 'text-align:right;':
          allign = '---:';
          break;
        case 'text-align:center;':
          allign = ':---:';
          break;
      }
    }
    tableArray[0][i] = headContent.trim();
    tableArray[1][i] = allign;
  }

  for (i = 0; i < rows.length; ++i) {
    var r = tableArray.push([]) - 1,
        cols = rows[i].getElementsByTagName('td');

    for (ii = 0; ii < headings.length; ++ii) {
      var cellContent = ' ';
      if (typeof cols[ii] !== 'undefined') {
        cellContent = showdown.subParser('makeMarkdown.tableCell')(cols[ii], globals);
      }
      tableArray[r].push(cellContent);
    }
  }

  var cellSpacesCount = 3;
  for (i = 0; i < tableArray.length; ++i) {
    for (ii = 0; ii < tableArray[i].length; ++ii) {
      var strLen = tableArray[i][ii].length;
      if (strLen > cellSpacesCount) {
        cellSpacesCount = strLen;
      }
    }
  }

  for (i = 0; i < tableArray.length; ++i) {
    for (ii = 0; ii < tableArray[i].length; ++ii) {
      if (i === 1) {
        if (tableArray[i][ii].slice(-1) === ':') {
          tableArray[i][ii] = showdown.helper.padEnd(tableArray[i][ii].slice(-1), cellSpacesCount - 1, '-') + ':';
        } else {
          tableArray[i][ii] = showdown.helper.padEnd(tableArray[i][ii], cellSpacesCount, '-');
        }
      } else {
        tableArray[i][ii] = showdown.helper.padEnd(tableArray[i][ii], cellSpacesCount);
      }
    }
    txt += '| ' + tableArray[i].join(' | ') + ' |\n';
  }

  return txt.trim();
});