' characters are * repeated on subsequent wrapped lines. Others are replaced by spaces. * - max: The maximum length at which to wrap each line. Defaults to 80. * - stuff: Whether to space-stuff special lines. Defaults to TRUE. * - hard: Whether to enforce the maximum line length even if no convenient * space character is available. Defaults to FALSE. * - pad: A string to use for padding short lines to 'max' characters. If * more than one character, only the last will be repeated. * - break: The line break sequence to insert. The default is one of the * following: * - "\r\n": Windows, when $text does not contain a space character. * - "\n": Non-Windows, when $text does not contain a space character. * - " \r\n": On Windows, when $text contains at least one space. * - " \n": Non-Windows, when $text contains at least one space. * * @see drupal_mail() */ function mailsystem_wrap_mail($text, array $options = array()) { static $defaults; if (!isset($defaults)) { $defaults = array( 'indent' => '', 'pad' => '', 'pad_repeat' => '', 'max' => 80, 'stuff' => TRUE, 'hard' => FALSE, 'eol' => variable_get('mail_line_endings', MAIL_LINE_ENDINGS), ); } $options += $defaults; if (!isset($options['break'])) { // Allow soft-wrap spaces only when $text contains at least one space. $options['break'] = (strpos($text, ' ') === FALSE ? '' : ' ') . $defaults['eol']; } $options['wrap'] = $options['max'] - drupal_strlen($options['indent']); if ($options['pad']) { $options['pad_repeat'] = drupal_substr($options['pad'], -1, 1); } // The 'clean' indent is applied to all lines after the first one. $options['clean'] = _mailsystem_html_to_text_clean($options['indent']); // Wrap lines according to RFC 3676. $lines = explode($defaults['eol'], $text); array_walk($lines, '_mailsystem_wrap_mail_line', $options); // Expand the lines array on newly-inserted line breaks. $lines = explode($defaults['eol'], implode($defaults['eol'], $lines)); // Apply indentation, space-stuffing, and padding. array_walk($lines, '_mailsystem_indent_mail_line', $options); return implode($defaults['eol'], $lines); } /** * Transform an HTML string into plain text, preserving the structure of the * markup. Useful for preparing the body of a node to be sent by e-mail. * * The output will be suitable for use as 'format=flowed; delsp=yes' text * (RFC 3676) and can be passed directly to drupal_mail() for sending. * * We deliberately use variable_get('mail_line_endings', MAIL_LINE_ENDINGS) * rather than "\r\n". * * This function provides suitable alternatives for the following tags: * *

* 

    •  
 *  
        
       
        
       
       DOM Node into plain text.  Attributes such as rowspan,
 * colspan, padding, border, etc. are ignored.
 *
 * @param DOMNode $node
 *   The DOMNode corresponding to the 
       tag and its contents.
 * @param $allowed_tags
 *   The list of allowed tags passed to _mailsystem_html_to_text().
 * @param array &$notes
 *   A writeable array of footnote reference numbers, keyed by their
 *   respective hyperlink destination urls.
 * @param $table_width
 *   The desired maximum table width, after word-wrapping each table cell.
 *
 * @return
 *   A plain text representation of the table.
 *
 * @see _mailsystem_html_to_text()
 */
function _mailsystem_html_to_text_table(DOMNode $node, $allowed_tags = NULL, array &$notes = array(), $table_width = 80) {
  $eol = variable_get('mail_line_endings', MAIL_LINE_ENDINGS);
  $header = array();
  $footer = array();
  $body = array();
  $text = $eol;
  $current = $node;
  while (TRUE) {
    if (isset($current->tagName)) {
      switch ($current->tagName) {
        case 'caption':  // The table caption is added first.
          $text = _mailsystem_html_to_text($current, $allowed_tags, $notes, $table_width);
          break;

        case 'tr':
          switch ($current->parentNode->tagName) {
            case 'thead':
              $header[] = $current;
              break;

            case 'tfoot':
              $footer[] = $current;
              break;

            default: // Either 'tbody' or 'table'
              $body[] = $current;
              break;
          }
          break;

        default:
          if ($current->hasChildNodes()) {
            $current = $current->firstChild;
            continue 2;
          }
      }
    }
    do {
      if ($current->nextSibling) {
        $current = $current->nextSibling;
        continue 2;
      }
      $current = $current->parentNode;
    } while ($current && !$current->isSameNode($node));
    break;
  }
  // Merge the thead, tbody, and tfoot sections together.
  if ($rows = array_merge($header, $body, $footer)) {
    $num_rows = count($rows);
    // First just count the number of columns.
    $num_cols = 0;
    foreach ($rows as $row) {
      $row_cols = 0;
      foreach ($row->childNodes as $cell) {
        if (isset($cell->tagName) && in_array($cell->tagName, array('td', 'th'))) {
          $row_cols++;
        }
      }
      $num_cols = max($num_cols, $row_cols);
    }
    // If any columns were found, calculate each column height and width.
    if ($num_cols) {
      // Set up a binary search for best wrap width for each column.
      $max = max($table_width - $num_cols - 1, 1);
      $max_wraps = array_fill(0, $num_cols, $max);
      $try = max(intval(($table_width - 1) / $num_cols - 1), 1);
      $try_wraps = array_fill(0, $num_cols, $try);
      $min_wraps = array_fill(0, $num_cols, 1);
      // Start searching...
      $change = FALSE;
      do {
        $change = FALSE;
        $widths = array_fill(0, $num_cols, 0);
        $heights = array_fill(0, $num_rows, 0);
        $table = array_fill(0, $num_rows, array_fill(0, $num_cols, ''));
        $breaks = array_fill(0, $num_cols, FALSE);
        foreach ($rows as $i => $row) {
          $j = 0;
          foreach ($row->childNodes as $cell) {
            if (!isset($cell->tagName) || !in_array($cell->tagName, array('td', 'th'))) {
              // Skip text nodes.
              continue;
            }
            // Render the cell contents.
            $cell = _mailsystem_html_to_text($cell, $allowed_tags, $notes, $try_wraps[$j]);
            // Trim leading line-breaks and trailing whitespace.
            // chr(160) is the non-breaking space character.
            $cell = rtrim(ltrim($cell, $eol), ' ' . $eol . chr(160));
            $table[$i][$j] = $cell;
            if ($cell > '') {
              // Split the cell into lines.
              $lines = explode($eol, $cell);
              // The row height is the maximum number of lines among all the
              // cells in that row.
              $heights[$i] = max($heights[$i], count($lines));
              foreach ($lines as $line) {
                $this_width = drupal_strlen($line);
                // The column width is the maximum line width among all the
                // lines in that column.
                if ($this_width > $widths[$j]) {
                  $widths[$j] = $this_width;
                  // If the longest line in a column contains at least one
                  // space character, then the table can be made narrower.
                  $breaks[$j] = strpos(' ', $line) !== FALSE;
                }
              }
            }
            $j++;
          }
        }
        // Calculate the total table width;
        $this_width = array_sum($widths) + $num_cols + 1;
        if ($this_width > $table_width) {
          // Wider than desired.
          if (!in_array(TRUE, $breaks)) {
            // If there are no more break points, then the table is already as
            // narrow as it can get, so we're done.
            break;
          }
          foreach ($try_wraps as $i => $wrap) {
            $max_wraps[$i] = min($max_wraps[$i], $wrap);
            if ($breaks[$i]) {
              $new_wrap = intval(($min_wraps[$i] + $max_wraps[$i]) / 2);
              $new_wrap = min($new_wrap, $widths[$i] - 1);
              $new_wrap = max($new_wrap, $min_wraps[$i]);
            }
            else {
              // There's no point in trying to make the column narrower than
              // the widest un-wrappable line in the column.
              $min_wraps[$i] = $widths[$i];
              $new_wrap = $widths[$i];
            }
            if ($try_wraps[$i] > $new_wrap) {
              $try_wraps[$i] = $new_wrap;
              $change = TRUE;
            }
          }
        }
        elseif ($this_width < $table_width) {
          // Narrower than desired.
          foreach ($try_wraps as $i => $wrap) {
            if ($min_wraps[$i] < $wrap) {
              $min_wraps[$i] = $wrap;
            }
            $new_wrap = intval(($min_wraps[$i] + $max_wraps[$i]) / 2);
            $new_wrap = max($new_wrap, $widths[$i] + 1);
            $new_wrap = min($new_wrap, $max_wraps[$i]);
            if ($try_wraps[$i] < $new_wrap) {
              $try_wraps[$i] = $new_wrap;
              $change = TRUE;
            }
          }
        }
      } while ($change);
      // Pad each cell to column width and line height.
      for ($i = 0; $i < $num_rows; $i++) {
        if ($heights[$i]) {
          for ($j = 0; $j < $num_cols; $j++) {
            $cell = $table[$i][$j];
            // Pad each cell to the maximum number of lines in that row.
            $lines = array_pad(explode($eol, $cell), $heights[$i], '');
            foreach ($lines as $k => $line) {
              // Pad each line to the maximum width in that column.
              $repeat = $widths[$j] - drupal_strlen($line);
              if ($repeat > 0) {
                // chr(160) is the non-breaking space character.
                $lines[$k] .= str_repeat(chr(160), $repeat);
              }
            }
            $table[$i][$j] = $lines;
          }
        }
      }
      // Generate the row separator line.
      $separator = '+';
      for($i = 0; $i < $num_cols; $i++) {
        $separator .= str_repeat('-', $widths[$i]) . '+';
      }
      $separator .= $eol;
      for ($i = 0; $i < $num_rows; $i++) {
        $text .= $separator;
        if (!$heights[$i]) {
          continue;
        }
        $row = $table[$i];
        // For each row, iterate first by lines within the row.
        for ($k = 0; $k < $heights[$i]; $k++) {
          // Add a vertical-bar at the beginning of each row line.
          $row_line = '|';
          $trimmed = '';
          // Within each row line, iterate by cells within that line.
          for ($j = 0; $j < $num_cols; $j++) {
            // Add a vertical bar at the end of each cell line.
            $row_line .= $row[$j][$k] . '|';
            // chr(160) is the non-breaking space character.
            $trimmed .= trim($row[$j][$k], ' ' . $eol . chr(160));
          }
          if ($trimmed > '') {
            // Only print rows that are non-empty.
            $text .= $row_line . $eol;
          }
        }
      }
      // Final output ends with a row separator.
      $text .= $separator;
    }
  }
  // Make sure formatted table content doesn't line-wrap.
  // chr(160) is the non-breaking space character.
  return str_replace(' ', chr(160), $text);
}

/**
 * Helper function for array_walk in drupal_wrap_mail().
 *
 * Inserts $values['break'] sequences to break up $line into parts of no more
 * than $values['wrap'] characters. Only breaks at space characters, unless
 * $values['hard'] is TRUE.
 */
function _mailsystem_wrap_mail_line(&$line, $key, $values) {
  $line = wordwrap($line, $values['wrap'], $values['break'], $values['hard']);
}

/**
 * Helper function for array_walk in drupal_wrap_mail().
 *
 * If $values['pad'] is non-empty, $values['indent'] will be added at the start
 * of each line, and $values['pad'] at the end, repeating the last character of
 * $values['pad'] until the line length equals $values['max'].
 *
 * If $values['pad'] is empty, $values['indent'] will be added at the start of
 * the first line, and $values['clean'] at the start of subsequent lines.
 *
 * If $values['stuff'] is true, then an extra space character will be added at
 * the start of any line beginning with a space, a '>', or the word 'From'.
 *
 * @see http://www.ietf.org/rfc/rfc3676.txt
 */
function _mailsystem_indent_mail_line(&$line, $key, $values) {
  if ($line == '') {
    return;
  }
  if ($values['pad']) {
    $line = $values['indent'] . $line;
    $count = $values['max'] - drupal_strlen($line) - drupal_strlen($values['pad']);
    if ($count >= 0) {
      $line .= $values['pad'] . str_repeat($values['pad_repeat'], $count);
    }
  }
  else {
    $line = $values[$key === 0 ? 'indent' : 'clean'] . $line;
  }
  if ($values['stuff']) {
    // chr(160) is the non-breaking space character.
    $line = preg_replace('/^(' . chr(160) . '| |>|From)/', ' $1', $line);
  }
}

/**
 * Helper function for drupal_wrap_mail() and drupal_html_to_text().
 *
 * Replace all non-quotation markers from a given piece of indentation with
 * non-breaking space characters.
 */
function _mailsystem_html_to_text_clean($indent) {
  // chr(160) is the non-breaking space character.
  return preg_replace('/[^>]/', chr(160), $indent);
}