aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/sabre/xml/lib/Element/XmlFragment.php
blob: bf110eaeefd04885745ddccb0b00f974073af2c9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
<?php

declare(strict_types=1);

namespace Sabre\Xml\Element;

use Sabre\Xml\Element;
use Sabre\Xml\Reader;
use Sabre\Xml\Writer;

/**
 * The XmlFragment element allows you to extract a portion of your xml tree,
 * and get a well-formed xml string.
 *
 * This goes a bit beyond `innerXml` and friends, as we'll also match all the
 * correct namespaces.
 *
 * Please note that the XML fragment:
 *
 * 1. Will not have an <?xml declaration.
 * 2. Or a DTD
 * 3. It will have all the relevant xmlns attributes.
 * 4. It may not have a root element.
 */
class XmlFragment implements Element
{
    /**
     * The inner XML value.
     *
     * @var string
     */
    protected $xml;

    /**
     * Constructor.
     */
    public function __construct(string $xml)
    {
        $this->xml = $xml;
    }

    /**
     * Returns the inner XML document.
     */
    public function getXml(): string
    {
        return $this->xml;
    }

    /**
     * The xmlSerialize method is called during xml writing.
     *
     * Use the $writer argument to write its own xml serialization.
     *
     * An important note: do _not_ create a parent element. Any element
     * implementing XmlSerializable should only ever write what's considered
     * its 'inner xml'.
     *
     * The parent of the current element is responsible for writing a
     * containing element.
     *
     * This allows serializers to be re-used for different element names.
     *
     * If you are opening new elements, you must also close them again.
     */
    public function xmlSerialize(Writer $writer)
    {
        $reader = new Reader();

        // Wrapping the xml in a container, so root-less values can still be
        // parsed.
        $xml = <<<XML
<?xml version="1.0"?>
<xml-fragment xmlns="http://sabre.io/ns">{$this->getXml()}</xml-fragment>
XML;

        $reader->xml($xml);

        while ($reader->read()) {
            if ($reader->depth < 1) {
                // Skipping the root node.
                continue;
            }

            switch ($reader->nodeType) {
                case Reader::ELEMENT:
                    $writer->startElement(
                        (string) $reader->getClark()
                    );
                    $empty = $reader->isEmptyElement;
                    while ($reader->moveToNextAttribute()) {
                        switch ($reader->namespaceURI) {
                            case '':
                                $writer->writeAttribute($reader->localName, $reader->value);
                                break;
                            case 'http://www.w3.org/2000/xmlns/':
                                // Skip namespace declarations
                                break;
                            default:
                                $writer->writeAttribute((string) $reader->getClark(), $reader->value);
                                break;
                        }
                    }
                    if ($empty) {
                        $writer->endElement();
                    }
                    break;
                case Reader::CDATA:
                case Reader::TEXT:
                    $writer->text(
                        $reader->value
                    );
                    break;
                case Reader::END_ELEMENT:
                    $writer->endElement();
                    break;
            }
        }
    }

    /**
     * The deserialize method is called during xml parsing.
     *
     * This method is called statically, this is because in theory this method
     * may be used as a type of constructor, or factory method.
     *
     * Often you want to return an instance of the current class, but you are
     * free to return other data as well.
     *
     * You are responsible for advancing the reader to the next element. Not
     * doing anything will result in a never-ending loop.
     *
     * If you just want to skip parsing for this element altogether, you can
     * just call $reader->next();
     *
     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
     * the next element.
     *
     * @return mixed
     */
    public static function xmlDeserialize(Reader $reader)
    {
        $result = new self($reader->readInnerXml());
        $reader->next();

        return $result;
    }
}