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<?php
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// $Id: Table.php,v 1.1 2005-01-20 19:43:20 jpm Exp $
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/**
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*
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* This class implements a Text_Wiki_Parse to find source text marked as a
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* set of table rows, where a line start and ends with double-pipes (||)
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* and uses double-pipes to separate table cells.  The rows must be on
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* sequential lines (no blank lines between them) -- a blank line
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* indicates the beginning of a new table.
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*
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* @author Paul M. Jones <pmjones@ciaweb.net>
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*
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* @package Text_Wiki
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*
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*/
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class Text_Wiki_Parse_Table extends Text_Wiki_Parse {
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    /**
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    *
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    * The regular expression used to parse the source text and find
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    * matches conforming to this rule.  Used by the parse() method.
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    *
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    * @access public
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    *
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    * @var string
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    *
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    * @see parse()
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    *
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    */
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    var $regex = '/\n((\|\|).*)(\n)(?!(\|\|))/Us';
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    /**
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    *
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    * Generates a replacement for the matched text.
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    *
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    * Token options are:
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    *
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    * 'type' =>
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    *     'table_start' : the start of a bullet list
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    *     'table_end'   : the end of a bullet list
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    *     'row_start' : the start of a number list
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    *     'row_end'   : the end of a number list
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    *     'cell_start'   : the start of item text (bullet or number)
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    *     'cell_end'     : the end of item text (bullet or number)
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    *
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    * 'cols' => the number of columns in the table (for 'table_start')
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    *
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    * 'rows' => the number of rows in the table (for 'table_start')
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    *
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    * 'span' => column span (for 'cell_start')
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    *
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    * 'attr' => column attribute flag (for 'cell_start')
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    *
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    * @access public
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    *
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    * @param array &$matches The array of matches from parse().
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    *
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    * @return A series of text and delimited tokens marking the different
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    * table elements and cell text.
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    *
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    */
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    function process(&$matches)
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    {
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        // our eventual return value
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        $return = '';
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        // the number of columns in the table
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        $num_cols = 0;
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        // the number of rows in the table
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        $num_rows = 0;
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        // rows are separated by newlines in the matched text
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        $rows = explode("\n", $matches[1]);
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        // loop through each row
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        foreach ($rows as $row) {
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            // increase the row count
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            $num_rows ++;
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            // start a new row
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            $return .= $this->wiki->addToken(
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                $this->rule,
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                array('type' => 'row_start')
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            );
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            // cells are separated by double-pipes
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            $cell = explode("||", $row);
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            // get the number of cells (columns) in this row
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            $last = count($cell) - 1;
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            // is this more than the current column count?
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            // (we decrease by 1 because we never use cell zero)
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            if ($last - 1 > $num_cols) {
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                // increase the column count
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                $num_cols = $last - 1;
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            }
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            // by default, cells span only one column (their own)
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            $span = 1;
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            // ignore cell zero, and ignore the "last" cell; cell zero
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            // is before the first double-pipe, and the "last" cell is
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            // after the last double-pipe. both are always empty.
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            for ($i = 1; $i < $last; $i ++) {
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                // if there is no content at all, then it's an instance
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                // of two sets of || next to each other, indicating a
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                // span.
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                if ($cell[$i] == '') {
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                    // add to the span and loop to the next cell
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                    $span += 1;
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                    continue;
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                } else {
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                    // this cell has content.
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                    // find any special "attr"ibute cell markers
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                    if (substr($cell[$i], 0, 2) == '> ') {
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                        // right-align
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                        $attr = 'right';
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                        $cell[$i] = substr($cell[$i], 2);
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                    } elseif (substr($cell[$i], 0, 2) == '= ') {
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                        // center-align
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                        $attr = 'center';
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                        $cell[$i] = substr($cell[$i], 2);
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                    } elseif (substr($cell[$i], 0, 2) == '< ') {
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                        // left-align
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                        $attr = 'left';
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                        $cell[$i] = substr($cell[$i], 2);
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                    } elseif (substr($cell[$i], 0, 2) == '~ ') {
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                        $attr = 'header';
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                        $cell[$i] = substr($cell[$i], 2);
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                    } else {
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                        $attr = null;
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                    }
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                    // start a new cell...
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                    $return .= $this->wiki->addToken(
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                        $this->rule,
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                        array (
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                            'type' => 'cell_start',
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                            'attr' => $attr,
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                            'span' => $span
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                        )
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                    );
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                    // ...add the content...
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                    $return .= trim($cell[$i]);
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                    // ...and end the cell.
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                    $return .= $this->wiki->addToken(
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                        $this->rule,
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                        array (
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                            'type' => 'cell_end',
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                            'attr' => $attr,
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                            'span' => $span
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                        )
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                    );
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                    // reset the span.
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                    $span = 1;
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                }
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            }
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            // end the row
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            $return .= $this->wiki->addToken(
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                $this->rule,
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                array('type' => 'row_end')
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            );
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        }
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        // wrap the return value in start and end tokens
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        $return =
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            $this->wiki->addToken(
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                $this->rule,
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                array(
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                    'type' => 'table_start',
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                    'rows' => $num_rows,
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                    'cols' => $num_cols
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                )
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            )
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            . $return .
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            $this->wiki->addToken(
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                $this->rule,
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                array(
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                    'type' => 'table_end'
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                )
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            );
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        // we're done!
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        return "\n$return\n\n";
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    }
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}
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?>