=====Klenwell Form Helper: options to table=====

For converting a radio group to columns in ""CakePhp"".  For more information, see http://www.klenwell.com/press/2009/01/cakephp-radio-select-columns/

=== helper code ===
%%(php)
<?php

class KlenwellFormHelper extends Helper
{   
	var $name = 'klenwellForm';
   
	var $before_marker = '<!-- _before_ -->';
	var $after_marker = '<!-- _after_ -->';
	var $separator_marker = '<!-- _separator_ -->';
	
	var $table_class = 'klenwell-option-table';


	function options_to_table($input, $num_cols=2)
	{
		/* Converts an input list into a table.  Requires before, after, and
		   separator options be set like so:
		  
			print $klenwellFormHelper->input_to_table(
				$form->input('Model.field', array('type'=>'radio',
								 'legend'=>'Label',
								 'value'=>$selected_value,
								 'before' => $klenwellFormHelper->before_marker,
								 'after' => $klenwellFormHelper->after_marker,
								 'separator' => $klenwellFormHelper->separator_marker,
								 'options'=>$Model->field_options));
			);
		*/
		
		// slice up form input method output at markers
		// sanity check
		if ( strpos($input, $this->before_marker) === false ||
			 strpos($input, $this->after_marker) === false ||
			 strpos($input, $this->separator_marker) === false )
		{
			trigger_error('unable to convert list to table, missing before, after, or between marker', E_USER_WARNING);
			return $this->output("<!-- Unable to convert to table / missing marker -->\n{$input}");
		}
		
		// get top, bottom, and middle chunks
		list($top, $trunk) = explode($this->before_marker, $input);
		list($middle, $bottom) = explode($this->after_marker, $trunk);
		
		// get option list
		$OptionList = explode($this->separator_marker, $middle);
		$num_options = count($OptionList);
		
		// cakephp doesn't cooperate with its before and after placement so we
		// have to do some tweaks here
		$ftag1 = '<fieldset>';
		$ftag2 = '</fieldset>';
		$legend_regex = '%<legend>.*</legend>%U';
		
		if ( strpos($OptionList[0], $ftag1) !== false )
		{
			$OptionList[0] = str_replace($ftag1, '', $OptionList[0]);
			$top .= $ftag1;
		}
		if ( $legend = preg_match($legend_regex, $OptionList[0], $Match) )
		{
			$OptionList[0] = str_replace($Match[0], '', $OptionList[0]);
			$top .= $Match[0];
		}
		if ( strpos($OptionList[$num_options-1], $ftag2) !== false )
		{
			$OptionList[$num_options-1] = str_replace($ftag2, '', $OptionList[$num_options-1]);
			$bottom = $ftag2 . $bottom;
		}
		
		// divvy options into columns (wrote this code a while ago and seems to work)
		for( $i = 1; $i <= $num_cols; $i++ )
		{
			$COL[$i] = ceil( $num_options/($num_cols+1-$i) );
			$num_options = $num_options - $COL[$i];
		}
		
		// add tags to columns
		$opt_num = 0;
		$table_cells = '';
		foreach ( $COL as $n => $num_in_col )
		{
			$col_list = '';
			while( $num_in_col > 0 )
			{
				$col_list .= "<li>{$OptionList[$opt_num]}</li>\n";
				$num_in_col--;
				$opt_num++;
			}
			
			$table_cells .= <<<XHTML
<td class="col-$n">
<ul>
$col_list
</ul>
</td>
XHTML;
		}
		
		// build table
		$middle = <<<XHTML
<table class="{$this->table_class}">
<tr>
$table_cells
</tr>
</table>
XHTML;
		
		// reassemble complete element
		$output = <<<XHTML
$top
$middle
$bottom
XHTML;
		
		// return
		return $this->output($output);
	}
}

?>
%%

=== usage ===
for usage in the view file
%%(php)
<?php
	print $klenwellForm->options_to_table(
		$form->input( 'Model.field2', array(
						'type'=>'radio',
						'legend'=>$legend,
						'value'=>$RainbowList_value,
						'before' => $klenwellForm->before_marker,
						'after' => $klenwellForm->after_marker,
						'separator' => $klenwellForm->separator_marker,
						'options' => $RainbowList,
						)
					),
		$num_cols=3
	);
?>
%%
----
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