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Image
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4.05
1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Svg;
6
7/**
8 * SVG `<image>` per SVG 2 §12.6 — references a raster (or SVG) bitmap to
9 * be drawn at a given position and size.
10 *
11 * `href()` deliberately returns the **raw** URL string. The parser never
12 * opens the URL; the painter in `phpdftk/svg-to-pdf` resolves it through
13 * the resource-loader gate established for `<img>` in 1L. That gate
14 * decides what's safe — `data:` URLs, allowlisted local files, etc. —
15 * keeping the security policy in one place.
16 */
17final class Image extends Element
18{
19    public function __construct()
20    {
21        parent::__construct('image');
22    }
23
24    public function x(): float
25    {
26        return $this->parseLengthOrZero('x');
27    }
28
29    public function y(): float
30    {
31        return $this->parseLengthOrZero('y');
32    }
33
34    /**
35     * `width` — non-negative. SVG 2 §12.6 makes both width and height
36     * optional; we return null when absent so the painter knows to
37     * fall back to the source bitmap's intrinsic dimensions.
38     */
39    public function width(): ?float
40    {
41        return $this->parseOptionalNonNegativeLength('width');
42    }
43
44    public function height(): ?float
45    {
46        return $this->parseOptionalNonNegativeLength('height');
47    }
48
49    /**
50     * Raw URL string from `href` (preferred) or `xlink:href` (legacy).
51     * Unlike `<use>` we don't strip anything — the painter / resource
52     * loader needs the full string to decide whether the URL points at
53     * a `data:` blob, an allowlisted local file, or something to reject.
54     */
55    public function href(): ?string
56    {
57        $raw = $this->getAttribute('href')
58            ?? $this->getAttribute('xlink:href');
59        if ($raw === null) {
60            return null;
61        }
62        $trimmed = trim($raw);
63        return $trimmed === '' ? null : $trimmed;
64    }
65
66    /**
67     * `preserveAspectRatio` returned as a raw string. The grammar
68     * (SVG 2 §7.10) is `<align> [ <meetOrSlice> ]?` — parsing into a
69     * typed value is a 3O painter concern.
70     */
71    public function preserveAspectRatio(): ?string
72    {
73        $raw = $this->getAttribute('preserveAspectRatio');
74        return $raw === null ? null : trim($raw);
75    }
76
77    private function parseOptionalNonNegativeLength(string $attr): ?float
78    {
79        $raw = $this->getAttribute($attr);
80        if ($raw === null) {
81            return null;
82        }
83        if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)/', $raw, $m) !== 1) {
84            return null;
85        }
86        $value = (float) $m[1];
87        return $value < 0.0 ? null : $value;
88    }
89}