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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Pdf\Build\PdfObject; |
| 16 | |
| 17 | /** |
| 18 | * Pdf parent object class |
| 19 | * |
| 20 | * @category Pop |
| 21 | * @package Pop\Pdf |
| 22 | * @author Nick Sagona, III <nick@popphp.org> |
| 23 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 24 | * @license https://www.popphp.org/license New BSD License |
| 25 | * @version 6.2.0 |
| 26 | */ |
| 27 | class ParentObject extends AbstractObject |
| 28 | { |
| 29 | |
| 30 | /** |
| 31 | * PDF parent object index |
| 32 | * @var ?int |
| 33 | */ |
| 34 | protected ?int $index = 2; |
| 35 | |
| 36 | /** |
| 37 | * PDF parent kids |
| 38 | * @var array |
| 39 | */ |
| 40 | protected array $kids = []; |
| 41 | |
| 42 | /** |
| 43 | * Explicit kid count override, used when kids are not leaf pages |
| 44 | * themselves (e.g. a merge's master node, whose kids are each source's |
| 45 | * own top-level Pages node) - null falls back to count($this->kids) |
| 46 | * @var ?int |
| 47 | */ |
| 48 | protected ?int $countOverride = null; |
| 49 | |
| 50 | /** |
| 51 | * Kids to append after every other kid has been added, rather than at |
| 52 | * their point of assignment (e.g. a merge's own source subtrees, which |
| 53 | * must land after any pages a target document already had before the |
| 54 | * merge, even though the merge builds this object before those existing |
| 55 | * pages get their own kid indices assigned during compilation) |
| 56 | * @var array |
| 57 | */ |
| 58 | protected array $deferredKids = []; |
| 59 | |
| 60 | /** |
| 61 | * Constructor |
| 62 | * |
| 63 | * Instantiate a PDF parent object. |
| 64 | * |
| 65 | * @param int $index |
| 66 | */ |
| 67 | public function __construct(int $index = 2) |
| 68 | { |
| 69 | $this->setIndex($index); |
| 70 | $this->setData("[{parent_index}] 0 obj\n<</Type/Pages/Count [{count}]/Kids[[{kids}]]>>\nendobj\n"); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Parse a parent object from a string |
| 75 | * |
| 76 | * @param string $stream |
| 77 | * @return ParentObject |
| 78 | */ |
| 79 | public static function parse(string $stream): ParentObject |
| 80 | { |
| 81 | $parent = new self(); |
| 82 | |
| 83 | $parent->setIndex((int)substr($stream, 0, strpos($stream, ' '))); |
| 84 | $stream = str_replace($parent->getIndex() . ' 0 obj', '[{parent_index}] 0 obj', $stream); |
| 85 | |
| 86 | // Determine the kids count. |
| 87 | $matches = []; |
| 88 | preg_match('/\/Count\s\d*/', $stream, $matches); |
| 89 | $count = $matches[0]; |
| 90 | $count = str_replace('/Count ', '', $count); |
| 91 | $stream = str_replace('Count ' . $count, 'Count [{count}]', $stream); |
| 92 | |
| 93 | // Determine the kids object indices. |
| 94 | $kids = trim(substr($stream, (strpos($stream, '/Kids') + 5))); |
| 95 | $kids = (str_starts_with($kids, '[')) ? substr($kids, 0, strpos($kids, ']') + 1) : |
| 96 | substr($kids, 0, (strpos($kids, ' R') + 2)); |
| 97 | |
| 98 | $kidIndices = $parent->getDictionaryReferences(substr($stream, (strpos($stream, '/Kids') + 5))); |
| 99 | |
| 100 | $parent->setKids($kidIndices); |
| 101 | $parent->setData(str_replace($kids, '[[{kids}]]', $stream) . "\n"); |
| 102 | |
| 103 | return $parent; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Add a kid index to the parent object |
| 108 | * |
| 109 | * @param int $kid |
| 110 | * @return ParentObject |
| 111 | */ |
| 112 | public function addKid(int$kid): ParentObject |
| 113 | { |
| 114 | $this->kids[] = (int)$kid; |
| 115 | return $this; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Remove a kid index from the parent object |
| 120 | * |
| 121 | * @param int $kid |
| 122 | * @return ParentObject |
| 123 | */ |
| 124 | public function removeKid(int $kid): ParentObject |
| 125 | { |
| 126 | if ($this->hasKid($kid)) { |
| 127 | unset($this->kids[array_search($kid, $this->kids)]); |
| 128 | } |
| 129 | return $this; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Set the parent object kids |
| 134 | * |
| 135 | * @param array $kids |
| 136 | * @return ParentObject |
| 137 | */ |
| 138 | public function setKids(array $kids): ParentObject |
| 139 | { |
| 140 | $this->kids = $kids; |
| 141 | return $this; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Set an explicit kid count, overriding count($this->kids) |
| 146 | * |
| 147 | * @param int $count |
| 148 | * @return ParentObject |
| 149 | */ |
| 150 | public function setCount(int $count): ParentObject |
| 151 | { |
| 152 | $this->countOverride = $count; |
| 153 | return $this; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Get the parent object kid count |
| 158 | * |
| 159 | * @return int |
| 160 | */ |
| 161 | public function getCount(): int |
| 162 | { |
| 163 | return $this->countOverride ?? count($this->kids); |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Get the parent object kid indices |
| 168 | * |
| 169 | * @return array |
| 170 | */ |
| 171 | public function getKids(): array |
| 172 | { |
| 173 | return $this->kids; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Set the kids to append after every other kid has been added |
| 178 | * |
| 179 | * @param array $kids |
| 180 | * @return ParentObject |
| 181 | */ |
| 182 | public function setDeferredKids(array $kids): ParentObject |
| 183 | { |
| 184 | $this->deferredKids = $kids; |
| 185 | return $this; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Get the kids to append after every other kid has been added |
| 190 | * |
| 191 | * @return array |
| 192 | */ |
| 193 | public function getDeferredKids(): array |
| 194 | { |
| 195 | return $this->deferredKids; |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Determine whether there are kids to append after every other kid |
| 200 | * |
| 201 | * @return bool |
| 202 | */ |
| 203 | public function hasDeferredKids(): bool |
| 204 | { |
| 205 | return (count($this->deferredKids) > 0); |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Determine whether the parent object contains a kid object index |
| 210 | * |
| 211 | * @param int $kid |
| 212 | * @return bool |
| 213 | */ |
| 214 | public function hasKid(int $kid): bool |
| 215 | { |
| 216 | return (in_array($kid, $this->kids)); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Method to print the parent object. |
| 221 | * |
| 222 | * @return string |
| 223 | */ |
| 224 | public function __toString(): string |
| 225 | { |
| 226 | return str_replace(['[{parent_index}]', '[{count}]', '[{kids}]'], |
| 227 | [(string)$this->index, (string)$this->getCount(), implode(" 0 R ", $this->kids) . " 0 R"], $this->data); |
| 228 | } |
| 229 | |
| 230 | } |