xref: /plugin/mermaid/syntax.php (revision 7d8a2661581a00e460c3a2d7e0b9f9f4593d0c35) 
1<?php
2/**
3 * DokuWiki Plugin mermaid (Syntax Component)
4 *
5 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
6 * @author  Robert Weinmeister <develop@weinmeister.org>
7 */
8
9use dokuwiki\Parsing\Parser;
10
11class syntax_plugin_mermaid extends \dokuwiki\Extension\SyntaxPlugin
12{
13    const DOKUWIKI_LINK_START_MERMAID = '<code>DOKUWIKILINKSTARTMERMAID</code>';
14    const DOKUWIKI_LINK_END_MERMAID = '<code>DOKUWIKILINKENDMERMAID</code>';
15    const DOKUWIKI_LINK_SPLITTER ='--';
16
17    function protect_brackets_from_dokuwiki($text)
18    {
19        $splitText = explode(self::DOKUWIKI_LINK_SPLITTER, $text);
20        foreach ($splitText as $key => $line)
21        {
22            $splitText[$key] = preg_replace('/(?<!["\[(\s])(\[\[)(.*)(\]\])/', self::DOKUWIKI_LINK_START_MERMAID . '$2' . self::DOKUWIKI_LINK_END_MERMAID, $line);
23        }
24        $text = implode(self::DOKUWIKI_LINK_SPLITTER, $splitText);
25        return $text;
26    }
27
28    function remove_protection_of_brackets_from_dokuwiki($text)
29    {
30        return str_replace(self::DOKUWIKI_LINK_START_MERMAID, '[[', str_replace(self::DOKUWIKI_LINK_END_MERMAID, ']]', $text));
31    }
32
33   	/** @inheritDoc */
34    function getType()
35	{
36		return 'container';
37	}
38
39    /** @inheritDoc */
40    function getSort()
41	{
42		return 150;
43	}
44
45    /**
46    * Connect lookup pattern to lexer.
47    *
48    * @param string $mode Parser mode
49    */
50    function connectTo($mode)
51    {
52        $this->Lexer->addEntryPattern('<mermaid.*?>(?=.*?</mermaid>)',$mode,'plugin_mermaid');
53    }
54
55    function postConnect()
56    {
57        $this->Lexer->addExitPattern('</mermaid>','plugin_mermaid');
58    }
59
60    /**
61     * Handle matches of the Mermaid syntax
62     */
63    function handle($match, $state, $pos, Doku_Handler $handler)
64    {
65        switch ($state) {
66            case DOKU_LEXER_ENTER:
67                return array($state, $match);
68            case DOKU_LEXER_UNMATCHED:
69                return array($state, $match);
70            case DOKU_LEXER_EXIT:
71                return array($state, '');
72        }
73        return false;
74    }
75
76    /**
77     * Render xhtml output or metadata
78     */
79    function render($mode, Doku_Renderer $renderer, $indata)
80    {
81        if($mode == 'xhtml'){
82            list($state, $match) = $indata;
83            switch ($state) {
84                case DOKU_LEXER_ENTER:
85                    $values = explode(" ", $match);
86                    $divwidth = count($values) < 2 ? 'auto' : $values[1];
87                    $divheight = count($values) < 3 ? 'auto' : substr($values[2], 0, -1);
88                    $renderer->doc .= '<div class="mermaid" style="width:'.$divwidth.'; height:'.$divheight.'">';
89                break;
90                case DOKU_LEXER_UNMATCHED:
91                    $instructions = $this->p_get_instructions($this->protect_brackets_from_dokuwiki($match));
92                    $xhtml = $this->remove_protection_of_brackets_from_dokuwiki($this->p_render($instructions));
93                    $renderer->doc .= preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $xhtml);
94                break;
95                case DOKU_LEXER_EXIT:
96                    $renderer->doc .= "\r\n</div>";
97                break;
98            }
99            return true;
100        }
101        return false;
102    }
103
104    /*
105     * Get the parser instructions suitable for the mermaid
106     *
107     */
108    function p_get_instructions($text)
109    {
110        //import parser classes and mode definitions
111        require_once DOKU_INC . 'inc/parser/parser.php';
112
113        // https://www.dokuwiki.org/devel:parser
114        // https://www.dokuwiki.org/devel:parser#basic_invocation
115        // Create the parser and the handler
116        $Parser = new Parser(new Doku_Handler());
117
118        $modes = array();
119
120        // add default modes
121        $std_modes = array( 'internallink', 'media', 'externallink');
122
123        foreach($std_modes as $m)
124        {
125            $class = 'dokuwiki\\Parsing\\ParserMode\\'.ucfirst($m);
126            $obj   = new $class();
127            $modes[] = array(
128                'sort' => $obj->getSort(),
129                'mode' => $m,
130                'obj'  => $obj
131            );
132        }
133
134        // add formatting modes
135        $fmt_modes = array( 'strong', 'emphasis', 'underline', 'monospace', 'subscript', 'superscript', 'deleted');
136        foreach($fmt_modes as $m)
137        {
138            $obj   = new \dokuwiki\Parsing\ParserMode\Formatting($m);
139            $modes[] = array(
140                'sort' => $obj->getSort(),
141                'mode' => $m,
142                'obj'  => $obj
143            );
144        }
145
146        //add modes to parser
147        foreach($modes as $mode)
148        {
149            $Parser->addMode($mode['mode'],$mode['obj']);
150        }
151
152        // Do the parsing
153        $p = $Parser->parse($text);
154
155        return $p;
156    }
157
158    public function p_render($instructions)
159    {
160        $Renderer = p_get_renderer('mermaid');
161
162        // Loop through the instructions
163        foreach ($instructions as $instruction) {
164            if(method_exists($Renderer, $instruction[0])){
165                call_user_func_array(array(&$Renderer, $instruction[0]), $instruction[1] ? $instruction[1] : array());
166            }
167        }
168
169        return $Renderer->doc;
170    }
171}
172