westdc-zf1/application/models/WikiFormat.php

<?php 
class WikiFormat{
 	/**
	 * parse the wiki syntax used to render tables, code modified from mediawiki
	 *
	 * @public
	 */
	function parseTable ( $text ) {
		$lines = explode ( "\n" , $text );
		$td_history = array (); // Is currently a td tag open?
		$last_tag_history = array (); // Save history of last lag activated (td, th or caption)
		$tr_history = array (); // Is currently a tr tag open?
		$tr_attributes = array (); // history of tr attributes
		$has_opened_tr = array(); // Did this table open a <tr> element?
		$indent_level = 0; // indent level of the table
		foreach ( $lines as $key => $line )
		{
			$line = trim ( $line );

			if( $line == '' ) { // empty line, go to next line
				continue;
			}
			$first_character = $line{0};
			$matches = array();

			if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
				// First check if we are starting a new table
				$indent_level = strlen( $matches[1] );

				$lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table>";
				array_push ( $td_history , false );
				array_push ( $last_tag_history , '' );
				array_push ( $tr_history , false );
				array_push ( $tr_attributes , '' );
				array_push ( $has_opened_tr , false );
			} else if ( count ( $td_history ) == 0 ) {
				// Don't do any of the following
				continue;
			} else if ( substr ( $line , 0 , 2 ) == '|}' ) {
				// We are ending a table
				$line = '</table>' . substr ( $line , 2 );
				$last_tag = array_pop ( $last_tag_history );

				if ( !array_pop ( $has_opened_tr ) ) {
					$line = "<tr><td></td></tr>{$line}";
				}

				if ( array_pop ( $tr_history ) ) {
					$line = "</tr>{$line}";
				}

				if ( array_pop ( $td_history ) ) {
					$line = "</{$last_tag}>{$line}";
				}
				array_pop ( $tr_attributes );
				$lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
			} else if ( substr ( $line , 0 , 2 ) == '|-' ) {
				// Now we have a table row
				$line = preg_replace( '#^\|-+#', '', $line );

				$line = '';
				$last_tag = array_pop ( $last_tag_history );
				array_pop ( $has_opened_tr );
				array_push ( $has_opened_tr , true );

				if ( array_pop ( $tr_history ) ) {
					$line = '</tr>';
				}

				if ( array_pop ( $td_history ) ) {
					$line = "</{$last_tag}>{$line}";
				}

				$lines[$key] = $line;
				array_push ( $tr_history , false );
				array_push ( $td_history , false );
				array_push ( $last_tag_history , '' );
			}
			else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
				// This might be cell elements, td, th or captions
				if ( substr ( $line , 0 , 2 ) == '|+' ) {
					$first_character = '+';
					$line = substr ( $line , 1 );
				}

				$line = substr ( $line , 1 );

				if ( $first_character == '!' ) {
					$line = str_replace ( '!!' , '||' , $line );
				}

				// Split up multiple cells on the same line.
				// FIXME : This can result in improper nesting of tags processed
				// by earlier parser steps, but should avoid splitting up eg
				// attribute values containing literal "||".
				$cells = explode( '||' , $line );

				$lines[$key] = '';

				// Loop through each table cell
				foreach ( $cells as $cell )
				{
					$previous = '';
					if ( $first_character != '+' )
					{
						$tr_after = array_pop ( $tr_attributes );
						if ( !array_pop ( $tr_history ) ) {
							$previous = "<tr{$tr_after}>\n";
						}
						array_push ( $tr_history , true );
						array_push ( $tr_attributes , '' );
						array_pop ( $has_opened_tr );
						array_push ( $has_opened_tr , true );
					}

					$last_tag = array_pop ( $last_tag_history );

					if ( array_pop ( $td_history ) ) {
						$previous = "</{$last_tag}>{$previous}";
					}

					if ( $first_character == '|' ) {
						$last_tag = 'td';
					} else if ( $first_character == '!' ) {
						$last_tag = 'th';
					} else if ( $first_character == '+' ) {
						$last_tag = 'caption';
					} else {
						$last_tag = '';
					}

					array_push ( $last_tag_history , $last_tag );

					// A cell could contain both parameters and data
					$cell_data = explode ( '|' , $cell , 2 );

					// Bug 553: Note that a '|' inside an invalid link should not
					// be mistaken as delimiting cell parameters
					if ( strpos( $cell_data[0], '[[' ) !== false ) {
						$cell = "{$previous}<{$last_tag}>{$cell}";
					} else if ( count ( $cell_data ) == 1 )
						$cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
					else {
						$cell = "{$previous}<{$last_tag}>{$cell_data[1]}";
					}

					$lines[$key] .= $cell;
					array_push ( $td_history , true );
				}
			}
		}

		// Closing open td, tr && table
		while ( count ( $td_history ) > 0 )
		{
			if ( array_pop ( $td_history ) ) {
				$lines[] = '</td>' ;
			}
			if ( array_pop ( $tr_history ) ) {
				$lines[] = '</tr>' ;
			}
			if ( !array_pop ( $has_opened_tr ) ) {
				$lines[] = "<tr><td></td></tr>" ;
			}

			$lines[] = '</table>' ;
		}

		$output = implode ( "\n" , $lines ) ;
		
		//@todo:移除<table></table>中所有的换行符
		//可能存在问题
		$output=preg_replace('/([a-zA-Z])>\n/m','$1>',$output);
		$output=preg_replace('/\n<\//m','</',$output);
		
		// special case: don't return empty table
		if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
			$output = '';
		}

		return $output;
	}
}