*   use 'm', 't', 'w', 'h', 'f' to distinguish Thursday and

 *   Tuesday. 'r' may also be used for Thursday.). Case does not

 *   matter.

  static $daymap_1 = array('m' => 1, 't' => 2, 'w' => 3, 'h' => 4, 'r' => 4, 'f' => 5);

/**

 * \brief

 *   Take a string of day initials and format it.

 *

 * \param $days_str

 *   Example input: 'mwf', 'TR'.

 * \return

 *   Same as school_crawl_days_format()

 */

function school_crawl_days_str_format($days_str)

{

  $day_initials = array();

  for ($i = 0; $i < strlen($days_str); $i ++)

    $day_initials[] = $days_str[$i];

  return school_crawl_days_format($day_initials);

}

/**

 * \brief

 *   Parse given html into an array, first row is row headers

 *

 * \param $html

 *   HTML that PHP's DOM would willingly would eat.

 */

function table_parse($html)

{

  if(!$html)

    return NULL;

  $dom->preserveWhiteSpace = FALSE;

function cedarville_crawl($semester, $verbosity = 1)

  foreach($departments as $department)

    {

      $html = file_get_contents($basepath . $year . $season . '_' . $department . '_' . 'all.htm');

      if (!$html)

	continue;

      $tables[$department] = table_parse(cedarville_html_fix($html));

  foreach ($tables as $dept_table)

    {

      /*

       * Discard the first row, which has the contents of the <th />

       * elements.

       */

      unset($dept_table[0]);

      foreach($dept_table as $course_table)

	{

	  /*

	   * format:

	   * 0: course synonym, an unsigned integer.

	   * 1: section spec, parsable by Section::parse().

	   * 2: friendly course title.

	   * 3: Instructor name.

	   * 4: Number of credit hours in decimal notation.

	   * 5: Fee.

	   * 6: Meeting time, explained below.

	   * 7: Cap.

	   * 8-10: Textbook link. Most rows only have column 8, not

	   *       all the way through 10. This information seems

	   *       quite useless.

	   *

	   * Section meeting time/place format:

	   *

	   * Confusing example: ' ILB  WI219   TR    08:30A-09:45A'

	   * Complete example plus lab: ' LEC  TYL203  MWF   08:00A-08:50A LAB  ENS118  TR    03:00P-04:30P'

	   *

	   * Appears to have format:

	   * <meeting_info>: <type> <room> <days> <time_start>-<time_end> <meeting_info>

	   *

	   * It appears tht <type> may be:

	   * LEC: normal lecture meeting.

	   * ONL: online course.

	   * ILB: ethan says a partially online course...?

	   * HYB: hybrid of...?

	   * FLD: field...?

	   * FE2: ?

	   * CLN: ?

	   * LAB: Lab

	   * LES: something for some PFMU/PLMU class?

	   */

	  $synonym = $course_table[0];

	  $section_parts = Section::parse($course_table[1]);

	  if (count($section_parts) < 3)

	    {

	      error_log('Error parsing section_id. Given `' . $course_table[1] . '\', interpreted as `'

			. implode('-', $section_parts) . '\'. Skipping.');

	      continue;

	  $instructor = $course_table[3];

	  /*

	   * Each course may have multiple meeting times associated

	   * with it at Cedarville. We are not sure how to handle this

	   * quite, because different class sections may be tied with

	   * different lab meetings and stuff...

	   */

	  $meetings_str = $course_table[6];

	  if (strpos($meetings_str, 'TBA') !== FALSE)

	    {

	      if ($verbosity > 1)

		error_log('Skipping ' . implode('-', $section_parts) . ' because its meeting time info has `TBA\' in it.');

	      continue;

	    }

	  $meetings = array();

	  $meeting_multiple_types = array();

	  while (strlen($meetings_str) > 5)

	    {

	      if (!preg_match(';^ ([A-Z]+) +([A-Z]+[A-Z0-9]*) +([MTWRF]{1,5}) +([0-9:AP]+)-([0-9:AP]+);',

			      $meetings_str, $meeting_matches))

		{

		  if (preg_match(';^Dates:[^0-9]+([/0-9]{8})-([/0-9]{8});',

				 $meetings_str, $meeting_matches))

		    {

		      if ($verbosity > 4)

			error_log('Skipping some meeting data for '

				  . implode('-', $section_parts) . ' because it is a date range: `'

				  . $meeting_matches[0] . '\'');

		      $meetings_str = substr($meetings_str, strlen($meeting_matches[0]));

		      continue;

		    }

		  if ($verbosity > 0)

		    error_log('Error parsing meeting time. Given `' . $meetings_str . '\'. Skipping '

			      . implode('-', $section_parts));

		  break;

		}

	      /* prepare for parsing the next meeting time */

	      $meetings_str = substr($meetings_str, strlen($meeting_matches[0]));

	      if (isset($meetings[$meeting_matches[1]]))

		{

		  if ($verbosity > 0 && !isset($meeting_multiple_types[$meeting_matches[1]]))

		    {

		      error_log('Section ' . implode('-', $section_parts)

				. ' has multiple meeting times for meeting_type of '

				. $meeting_matches[1] . ' which my unflexible code which'

				. ' could be made more flexible doesn\'t yet support.'

				. ' Skipping the extra meeting times for this type of meeting.');

		      /* only give the above error once per type. */

		      $meeting_multiple_types[$meeting_matches[1]] = TRUE;

		    }

		  continue;

		}

	      $meetings[$meeting_matches[1]]

		= array('room' => $meeting_matches[2],

			'days' => school_crawl_days_str_format($meeting_matches[3]),

			'time_start' => school_crawl_time_format(strptime($meeting_matches[4] . 'M', '%I:%M%p')),

			'time_end' => school_crawl_time_format(strptime($meeting_matches[5] . 'M', '%I:%M%p')),

			'type' => $meeting_matches[1], 

			);

	    }

	  foreach ($meetings as $meeting)

	    {

	      $section_letter = $section_parts['section'];

	      if ($meeting['type'] == 'LECT')

		/**

		 * \todo this might not make much sense.		 

		 */

		$section_letter = 'L' . $section_letter;

	      $semester->section_add($section_parts['department'], $section_parts['course'],

				     new Section($section_letter, $instructor,

						 $meeting['time_start'], $meeting['time_end'],

						 $meeting['days']));

	    }

	}

    }

  return 0;

}

/**

 * \brief

 *   Fix some incorrect usage of the HTML entity delimiter, the ampersand.

 */

function cedarville_html_fix($html)

{

  $html = preg_replace('/&&/', '&&', $html);

  return preg_replace('/&([^;]{5})/', '&$1', $html);

}