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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Conformance\Constraint; |
| 6 | |
| 7 | use Phpdftk\Pdf\Conformance\Inspection\DocumentInspector; |
| 8 | use Phpdftk\Pdf\Conformance\Profile\ConformanceProfile; |
| 9 | use Phpdftk\Pdf\Conformance\Profile\PdfAProfile; |
| 10 | use Phpdftk\Pdf\Conformance\Profile\PdfUaProfile; |
| 11 | use Phpdftk\Pdf\Conformance\Result\ConformanceViolation; |
| 12 | use Phpdftk\Pdf\Conformance\Result\ViolationSeverity; |
| 13 | |
| 14 | /** |
| 15 | * Tagged structure requirements for PDF/A Level A and PDF/UA. |
| 16 | * |
| 17 | * PDF/A-1a/2a/3a (ISO 19005 clause 6.8): |
| 18 | * - MarkInfo /Marked must be true |
| 19 | * - StructTreeRoot must be present |
| 20 | * - Catalog /Lang must be set |
| 21 | * |
| 22 | * PDF/UA-1 (ISO 14289-1 clause 7): |
| 23 | * - Same base requirements as PDF/A Level A |
| 24 | */ |
| 25 | final class TaggedStructureConstraint implements ConformanceConstraint |
| 26 | { |
| 27 | public function check(DocumentInspector $inspector, ConformanceProfile $profile): array |
| 28 | { |
| 29 | // PDF/UA always requires tagged structure |
| 30 | // PDF/A only requires it for Level A |
| 31 | if ($profile instanceof PdfAProfile && !$profile->requiresTaggedStructure()) { |
| 32 | return []; |
| 33 | } |
| 34 | |
| 35 | $isPdfUa = $profile instanceof PdfUaProfile; |
| 36 | $violations = []; |
| 37 | $catalog = $inspector->getCatalog(); |
| 38 | |
| 39 | // MarkInfo /Marked must be true |
| 40 | if ($catalog->markInfo === null || $catalog->markInfo->marked !== true) { |
| 41 | $violations[] = new ConformanceViolation( |
| 42 | clause: $isPdfUa ? '7.1' : '6.8.1', |
| 43 | message: 'MarkInfo /Marked must be true — all content must be tagged', |
| 44 | severity: ViolationSeverity::Error, |
| 45 | objectPath: 'Catalog.MarkInfo', |
| 46 | ); |
| 47 | } |
| 48 | |
| 49 | // StructTreeRoot must be present |
| 50 | if ($catalog->structTreeRoot === null) { |
| 51 | $violations[] = new ConformanceViolation( |
| 52 | clause: $isPdfUa ? '7.1' : '6.8.2', |
| 53 | message: 'StructTreeRoot is required — all content must be in the structure tree', |
| 54 | severity: ViolationSeverity::Error, |
| 55 | objectPath: 'Catalog.StructTreeRoot', |
| 56 | ); |
| 57 | } |
| 58 | |
| 59 | // Document language must be set |
| 60 | if ($catalog->lang === null) { |
| 61 | $violations[] = new ConformanceViolation( |
| 62 | clause: $isPdfUa ? '7.2' : '6.8.4', |
| 63 | message: 'Catalog /Lang is required — document must specify its natural language', |
| 64 | severity: ViolationSeverity::Error, |
| 65 | objectPath: 'Catalog.Lang', |
| 66 | ); |
| 67 | } |
| 68 | |
| 69 | return $violations; |
| 70 | } |
| 71 | } |