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280 lines
9.6 KiB
PHP
280 lines
9.6 KiB
PHP
<?php
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///////////////////////////////////////////////////////////////////////////
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// wiki.php - class for Wiki style formatting
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//
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// Transforms input string with Wiki style formatting into HTML
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//
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//
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///////////////////////////////////////////////////////////////////////////
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// //
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// NOTICE OF COPYRIGHT //
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// //
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// //
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// Copyright (C) 2003 Howard Miller - GUIDE - University of Glasgow
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// guide.gla.ac.uk
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation; either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details: //
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// //
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// http://www.gnu.org/copyleft/gpl.html //
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// //
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///////////////////////////////////////////////////////////////////////////
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// state defines
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define( "STATE_NONE",1 ); // blank line has been detected, so looking for first line on next para
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define( "STATE_PARAGRAPH",2 ); // currently processing vanilla paragraph
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define( "STATE_BLOCKQUOTE",3 ); // currently processing blockquote section
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define( "STATE_PREFORM",4 ); // currently processing preformatted text
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define( "STATE_NOTIKI",5 ); // currently processing preformatted / no formatting
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// list defines
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define( "LIST_NONE", 1 ); // no lists active
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define( "LIST_UNORDERED", 2 ); // unordered list active
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define( "LIST_ORDERED", 3 ); // ordered list active
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define( "LIST_DEFINITION", 4 ); // definition list active
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class Wiki {
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var $block_state;
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var $list_state;
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var $output; // output buffer
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function close_block( $state ) {
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// provide appropriate closure for block according to state
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// if in list close this first
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$ltag = "";
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switch ($this->list_state) {
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case LIST_NONE:
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break;
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case LIST_UNORDERED:
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$ltag = "</ul>\n";
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break;
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case LIST_ORDERED:
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$ltag = "</ol>\n";
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break;
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case LIST_DEFINITION:
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$ltag = "</dl>\n";
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break;
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}
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$this->list_state = LIST_NONE;
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switch ($state) {
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case STATE_PARAGRAPH:
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return "$ltag</p>\n";
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break;
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case STATE_BLOCKQUOTE:
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return "$ltag</blockquote>\n";
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break;
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case STATE_PREFORM:
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return "$ltag</pre>\n";
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break;
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case STATE_NOTIKI:
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return "$ltag</pre>\n";
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break;
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}
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}
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function do_replace( $line, $mark, $tag ) {
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// do the regex thingy for things like bold, italic etc
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// $mark is the magic character, and $tag the HTML tag to insert
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$regex = '(^| |[(.,])'.$mark.'([^'.$mark.']*)'.$mark.'($| |[.,;:)])';
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$replace = '\\1<'.$tag.'>\\2</'.$tag.'>\\3';
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return eregi_replace( $regex, $replace, $line );
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}
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function do_list( $line ) {
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// handle line with list character on it
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// get magic character and then delete it from the line
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$listchar = $line{0};
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$line = eregi_replace( "^[*#;:] ", "", $line );
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// if not in "list mode" then we need to drop the appropriate start tag
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$tag = "";
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if ($this->list_state == LIST_NONE) {
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switch ($listchar) {
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case '*':
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$tag = "<ul>";
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$this->list_state = LIST_UNORDERED;
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break;
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case '#':
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$tag = "<ol>";
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$this->list_state = LIST_ORDERED;
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break;
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case ';':
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case ':':
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$tag = "<dl>";
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$this->list_state = LIST_DEFINITION;
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break;
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}
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}
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// generate appropriate list tag
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$ltag = "";
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switch ($listchar) {
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case '*':
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case '#':
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$ltag = "<li>";
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break;
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case ';':
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$ltag = "<dd>";
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break;
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case ':':
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$ltag = "<dt>";
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break;
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}
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return $tag . $ltag . $line;
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}
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function line_replace( $line ) {
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// return line after various formatting replacements
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// have been made - order is vital to stop them interfering with each other
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// ---- (at least) means a <HR>
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$line = eregi_replace( "^-{4}.*", "<hr />", $line );
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// is this a list line (starts with * # ; :)
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if (eregi( "^[*#;:] ", $line )) {
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$line = $this->do_list( $line );
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}
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// typographic conventions
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$line = eregi_replace( "--", "—", $line );
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$line = eregi_replace( " - ", " – ", $line );
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$line = eregi_replace( "\.\.\.", " … ", $line );
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$line = eregi_replace( "\(R\)", "®", $line );
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$line = eregi_replace( "\(TM\)", "™", $line );
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$line = eregi_replace( "\(C\)", "©", $line );
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$line = eregi_replace( "1/4", "¼", $line );
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$line = eregi_replace( "1/2", "½", $line );
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$line = eregi_replace( "3/4", "¾", $line );
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$line = eregi_replace( "([[:digit:]]+[[:space:]]*)x([[:space:]]*[[:digit:]]+)", "\\1×\\2", $line ); // (digits) x (digits) - multiply
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// do formatting tags
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// NOTE: The / replacement *has* to be first, or it will screw the
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// HTML tags that are added by the other ones
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$line = $this->do_replace( $line, "/", "em" );
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$line = $this->do_replace( $line, "\*", "strong" );
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$line = $this->do_replace( $line, "\+", "ins" );
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$line = $this->do_replace( $line, "-", "del" );
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$line = $this->do_replace( $line, "~", "sub" );
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$line = $this->do_replace( $line, "\^", "sup" );
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$line = $this->do_replace( $line, "\"", "q" );
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$line = $this->do_replace( $line, "'", "q" );
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$line = $this->do_replace( $line, "%", "code" );
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$line = $this->do_replace( $line, "@", "cite" );
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// make urls (with and without httpd) into proper links
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$line = eregi_replace("([[:space:]]|^)([[:alnum:]]+)://([^[:space:]]*)([[:alnum:]#?/&=])",
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"\\1<A HREF=\"\\2://\\3\\4\" TARGET=\"newpage\">\\2://\\3\\4</A>", $line);
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$line = eregi_replace("([[:space:]])www\.([^[:space:]]*)([[:alnum:]#?/&=])",
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"\\1<A HREF=\"http://www.\\2\\3\" TARGET=\"newpage\">www.\\2\\3</A>", $line);
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// !# at the beginning of any lines means a heading
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$line = eregi_replace( "^!([1-6]) (.*)$", "<h\\1>\\2</h\\1>", $line );
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// acronym handing, example HTML(Hypertext Markyp Language)
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$line = ereg_replace( "([A-Z]+)\(([^)]+)\)", "<acronym title=\"\\2\">\\1</acronym>", $line );
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return $line;
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}
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function format( $content ) {
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// main entry point for processing TikiText
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// $content is string containing text with Tiki formatting
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// return: string containing XHTML formatting
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// initialisation stuff
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$this->output = "";
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$this->block_state = STATE_NONE;
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$this->list_state = LIST_NONE;
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// split content into array of single lines
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$lines = explode( "\n",$content );
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$buffer = "";
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// run through lines
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foreach( $lines as $line ) {
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// convert line contents
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// if ($this->block_state!=STATE_NOTIKI) {
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// $line = $this->line_replace( $line );
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//}
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// is this a blank line?
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$blank_line = eregi( "^[[:blank:]\r]*$", $line );
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if ($blank_line) {
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// first end current block according to state
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$buffer = $buffer . $this->close_block( $this->block_state );
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$this->block_state = STATE_NONE;
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continue;
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}
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// act now depending on current block state
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if ($this->block_state == STATE_NONE) {
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// first character of line defines block type
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if (eregi( "^> ",$line )) {
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// blockquote
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$buffer = $buffer . "<blockquote>\n";
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$buffer = $buffer . $this->line_replace( eregi_replace( "^>","",$line) ). "\n";
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$this->block_state = STATE_BLOCKQUOTE;
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}
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else
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if (eregi( "^ ",$line) ) {
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// preformatted text
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$buffer = $buffer . "<pre>\n";
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$buffer = $buffer . $this->line_replace($line) . "\n";
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$this->block_state = STATE_PREFORM;
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}
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else
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if (eregi("^\% ",$line) ) {
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// preformatted text - no processing
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$buffer = $buffer . "<pre>\n";
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$buffer = $buffer . eregi_replace( "^\%","",$line) . "\n";
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$this->block_state = STATE_NOTIKI;
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}
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else {
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// ordinary paragraph
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$buffer = $buffer . "<p>\n";
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$buffer = $buffer . $this->line_replace($line) . "\n";
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$this->block_state = STATE_PARAGRAPH;
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}
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continue;
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}
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if (($this->block_state == STATE_PARAGRAPH) |
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($this->block_state == STATE_BLOCKQUOTE) |
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($this->block_state == STATE_PREFORM) ) {
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$buffer = $buffer . $this->line_replace($line) . "\n";
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continue;
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}
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elseif ($this->block_state == STATE_NOTIKI) {
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$buffer = $buffer . $line . "\n";
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}
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}
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// close off any block level tags
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$buffer = $buffer . $this->close_block( $this->block_state );
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return $buffer;
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}
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}
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?>
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