ASCII Tables PHP Class

August 20th, 2007 • General

The following mess that I’ll call code is a rough translation from a Python implementation, found on Reddit. Somebody beat me to a Ruby version, so I decided to flex those rusty PHP braincells.

Please forgive running lines, lack of refactoring and some stupid practices. Don’t blame PHP, because this can be refactored to a more concise version. But like I said, this is a translation, not a reimplementation.

Here’s how to use it:

<?php
$table <<<EOP
---------------------------
|         |       |       |
|         |       |       |
|         |       |       |
|         |-------|       |
|         |       |       |
|         |       |-------|
|         |       |       |
|         |       |       |
|---------|       |-------|
|    |    |       |       |
|    |    |-------|       |
|    |    |       |       |
|    |    |       |       |
|    |    |       |       |
---------------------------
EOP;

$asciiTable = new AsciiTable($table);
echo $asciiTable->toHTML();
?>

And here’s the code:

#!/usr/bin/php
<?php
 
class AsciiTable
{
 
    function AsciiTable($table)
    {
        // $this->grid is an array. $this->grid[$y] is a string,
        // this explains count vs. strlen below.
        $this->grid = preg_split('/[\n\r]+/', $table);
 
        $this->y_delimiters = array();
        $this->x_delimiters = array();
    }
 
    function toHTML()
    {
        $this->parseAsciiTable();
        return $this->renderHtml();
    }
 
    function parseAsciiTable()
    {
        $grid = $this->grid;
 
        $boxes = array();
        for ( $y = 0; $y < count($grid); $y++ )
        {
            for ( $x = 0; $x < strlen($grid[$y]); $x++ )
            {
                if ( in_array($grid[$y][$x], array('-', '|')) 
                    && $grid[$y+1][$x] == '|' && $grid[$y][$x+1] == '-' )
                {
                    $right = strpos($grid[$y+1], '|', $x + 1) - 1;
 
                    // We can't do an array_pos with a callback. Darn.
                    foreach ( range($y, count($grid)) as $bottom )
                    {
                        if ( $grid[$bottom+1][$x+1] == '-' )
                            break;
                    }
                    $this->y_delimiters[] = $bottom;
                    $this->x_delimiters[] = $right;
                    array_push($boxes, array('x' => $x, 'y' => $y, 
                                        'r' => $right, 'b' => $bottom));
                }
            }
        }
 
        $this->boxes = $boxes;
 
        sort($this->y_delimiters);
        $this->y_delimiters = array_unique($this->y_delimiters);
 
        sort($this->x_delimiters);
        $this->x_delimiters = array_unique($this->x_delimiters);
 
        return $boxes;
    }
 
    function rowSpans()
    {
        foreach ( $this->y_delimiters as $delim )
        {
            foreach ( $this->boxes as $index => $box )
            {
                if ( $box['y'] < $delim && $box['b'] >= $delim )
                {
                    $this->boxes[$index]['rs']++;
                }
            }
        }
    }
 
    function colSpans()
    {
        foreach ( $this->x_delimiters as $delim )
        {
            foreach ( $this->boxes as $index => $box )
            {
                if ( $box['x'] < $delim && $box['r'] >= $delim )
                {
                    $this->boxes[$index]['cs']++;
                }
            }
        }
    }
 
    function renderHtml()
    {
        $this->rowSpans();
        $this->colSpans();
 
        $boxes_left = $this->boxes;
        $row = array();
 
        foreach ( $this->y_delimiters as $delim )
        {
            $boxes_in_row = array();
            foreach ( $boxes_left as $index => $box )
            {
                if ( $box['y'] < $delim )
                {
                    $boxes_in_row[] = $box;
                    unset($boxes_left[$index]);
                }
            }
 
            // sory by $box['x']
            usort($boxes_in_row, 
                    create_function('$a, $b', 'return ($a["x"] 
                    == $b["x"]) ? 0 : ($a["x"] < $b["x"]) ? -1 : 1;'));
            $rows[] = $boxes_in_row;
        }
 
        $table = "<table border=\"border\">\n";
        foreach ( $rows as $row )
        {
            $table .= "  <tr>\n";
            foreach ( $row as $box )
            {
                $table .= sprintf("
                            <td rowspan=\"%d\" colspan=\"%d\">%s</td>\n",
                            $box['rs'], $box['cs'],
                            str_repeat('blank<br/>', $box['b'] - $box['y'])
                        );
            }
            $table .= "  </tr>\n";
        }
        $table .= "</table>\n";
        return $table;
    }
}
?>
 

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