xref: /plugin/struct/action/output.php (revision 308cc83fd5391df29d21d2bc1306c8da49fdb335) 
1<?php
2
3/**
4 * DokuWiki Plugin struct (Action Component)
5 *
6 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
7 * @author  Andreas Gohr, Michael Große <dokuwiki@cosmocode.de>
8 */
9
10/**
11 * Class action_plugin_struct_output
12 *
13 * This action component handles the automatic output of all schema data that has been assigned
14 * to the current page by appending the appropriate instruction to the handler calls.
15 *
16 * The real output creation is done within the syntax component
17 * @see syntax_plugin_struct_output
18 */
19class action_plugin_struct_output extends DokuWiki_Action_Plugin
20{
21
22    const DW2PDF_PLACEHOLDER_PREFIX = 'PLUGIN_STRUCT';
23
24    /**
25     * Registers a callback function for a given event
26     *
27     * @param Doku_Event_Handler $controller DokuWiki's event controller object
28     * @return void
29     */
30    public function register(Doku_Event_Handler $controller)
31    {
32        $controller->register_hook('PARSER_HANDLER_DONE', 'AFTER', $this, 'handleOutput');
33        $controller->register_hook('PLUGIN_DW2PDF_REPLACE', 'BEFORE', $this, 'replaceDw2pdf');
34        $controller->register_hook('PLUGIN_DW2PDF_REPLACE', 'AFTER', $this, 'cleanupDw2pdf');
35    }
36
37    /**
38     * Appends the instruction to render our syntax output component to each page
39     * after the first found headline or the very begining if no headline was found
40     *
41     * @param Doku_Event $event
42     * @param $param
43     */
44    public function handleOutput(Doku_Event $event, $param)
45    {
46        global $ID;
47        if (!page_exists($ID)) return;
48        $ins = -1;
49        $pos = 0;
50        foreach ($event->data->calls as $num => $call) {
51            // try to find the first header
52            if ($call[0] == 'header') {
53                $pos = $call[2];
54                $ins = $num;
55                break;
56            }
57
58            // abort when after we looked at the first 150 bytes
59            if (isset($call[3]) && $call[3] > 150) {
60                break;
61            }
62        }
63
64        // insert our own call after the found position
65        array_splice(
66            $event->data->calls,
67            $ins + 1,
68            0,
69            array(
70                array(
71                    'plugin',
72                    array(
73                        'struct_output', array('pos' => $pos), DOKU_LEXER_SPECIAL, ''
74                    ),
75                    $pos
76                )
77            )
78        );
79    }
80
81    /**
82     * If the page has a schema assigned, add its struct data
83     * to dw2pdf's template replacements
84     *
85     * @param Doku_Event $event
86     * @param $param
87     */
88    public function replaceDw2pdf(Doku_Event $event, $param)
89    {
90        if (!$event->data['id'] || !page_exists($event->data['id'])) return;
91
92        global $REV;
93        $rev = $REV ?: time();
94
95        /** @var helper_plugin_struct $helper */
96        $helper = plugin_load('helper', 'struct');
97        $data = $helper->getData($event->data['id'], null, $rev);
98
99        if (!$data) return;
100
101        foreach ($data as $schema => $fields) {
102            foreach ($fields as $field => $value) {
103                $placeholder = sprintf('@%s_%s_%s@', self::DW2PDF_PLACEHOLDER_PREFIX, $schema, $field);
104                $event->data['replace'][$placeholder] = is_array($value) ? implode(', ', $value) : $value;
105            }
106        }
107    }
108
109    /**
110     * Remove struct placeholders still present after replacement.
111     * Requested data was not found.
112     *
113     * @param Doku_Event $event
114     * @param $param
115     */
116    public function cleanupDw2pdf(Doku_Event $event, $param)
117    {
118        $pattern = '~@' . self::DW2PDF_PLACEHOLDER_PREFIX . '_[^@]+?@~';
119        $event->data['content'] = preg_replace($pattern, '', $event->data['content']);
120    }
121}
122
123// vim:ts=4:sw=4:et:
124