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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\PagedMedia\Fragmentation; |
| 6 | |
| 7 | /** |
| 8 | * CSS Fragmentation 3 §3 — `break-before`, `break-after`, |
| 9 | * `break-inside` values, plus their legacy `page-break-*` aliases. |
| 10 | * |
| 11 | * `Auto` — no constraint; the engine breaks where it normally |
| 12 | * would based on remaining space |
| 13 | * `Avoid` — try not to break at this position; the engine may |
| 14 | * still break if there's no other choice |
| 15 | * `Always` — force a break |
| 16 | * `AvoidPage` — try not to break across a *page* boundary |
| 17 | * specifically; column breaks are still allowed |
| 18 | * `Page` — force a page break |
| 19 | * `Left`/`Right`— force a break + skip to a left / right page |
| 20 | * `Recto`/`Verso`— left/right per writing direction (logical) |
| 21 | * `AvoidColumn` / `Column` — column-only variants |
| 22 | * |
| 23 | * Phase 4G.1 (extraction) maps CSS keyword values into these cases. |
| 24 | */ |
| 25 | enum BreakRule: string |
| 26 | { |
| 27 | case Auto = 'auto'; |
| 28 | case Avoid = 'avoid'; |
| 29 | case Always = 'always'; |
| 30 | case AvoidPage = 'avoid-page'; |
| 31 | case Page = 'page'; |
| 32 | case Left = 'left'; |
| 33 | case Right = 'right'; |
| 34 | case Recto = 'recto'; |
| 35 | case Verso = 'verso'; |
| 36 | case AvoidColumn = 'avoid-column'; |
| 37 | case Column = 'column'; |
| 38 | |
| 39 | /** |
| 40 | * True for any value that forces a break (`Always`, `Page`, |
| 41 | * `Left`, `Right`, `Recto`, `Verso`, `Column`). |
| 42 | */ |
| 43 | public function isForced(): bool |
| 44 | { |
| 45 | return match ($this) { |
| 46 | self::Always, self::Page, self::Left, self::Right, |
| 47 | self::Recto, self::Verso, self::Column => true, |
| 48 | default => false, |
| 49 | }; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * True for any value that requests the engine avoid a break |
| 54 | * at this position if possible. |
| 55 | */ |
| 56 | public function isAvoid(): bool |
| 57 | { |
| 58 | return match ($this) { |
| 59 | self::Avoid, self::AvoidPage, self::AvoidColumn => true, |
| 60 | default => false, |
| 61 | }; |
| 62 | } |
| 63 | } |