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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace SciPhp\NdArray; |
| 6 | |
| 7 | use SciPhp\NdArray; |
| 8 | use SciPhp\NumPhp as np; |
| 9 | |
| 10 | /** |
| 11 | * NdArray formatter |
| 12 | */ |
| 13 | final class Formatter |
| 14 | { |
| 15 | /** |
| 16 | * @var int |
| 17 | */ |
| 18 | private $maxColSize = 0; |
| 19 | |
| 20 | /** |
| 21 | * @var int |
| 22 | */ |
| 23 | private $maxRows = 10; |
| 24 | |
| 25 | /** |
| 26 | * @var \SciPhp\NdArray |
| 27 | */ |
| 28 | private $array; |
| 29 | |
| 30 | /** |
| 31 | * @var int |
| 32 | */ |
| 33 | private $indent = 0; |
| 34 | |
| 35 | /** |
| 36 | * @var string |
| 37 | */ |
| 38 | private $string = ''; |
| 39 | |
| 40 | /** |
| 41 | * @var bool |
| 42 | * |
| 43 | * Is there any negative number ? |
| 44 | */ |
| 45 | private $negative = false; |
| 46 | |
| 47 | /** |
| 48 | * Set array data and options |
| 49 | */ |
| 50 | public function __construct(NdArray $array) |
| 51 | { |
| 52 | // truncate |
| 53 | if (count($array->data) > $this->maxRows) { |
| 54 | $data = $array->data; |
| 55 | array_splice( |
| 56 | $data, |
| 57 | intval(ceil($this->maxRows / 2)), |
| 58 | count($data) - $this->maxRows, |
| 59 | [ array_pad([], count($data[0]), '...') ] |
| 60 | ); |
| 61 | $array = np::ar($data); |
| 62 | } |
| 63 | |
| 64 | $this->array = $array; |
| 65 | |
| 66 | // Estimate max column size |
| 67 | $this->array->walk_recursive( |
| 68 | function ($item): void { |
| 69 | $negative = \is_numeric($item) && $item < 0; |
| 70 | $length = strlen("{$item}"); |
| 71 | |
| 72 | if ($negative) { |
| 73 | $length++; |
| 74 | if (! $this->negative) { |
| 75 | $this->negative = true; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | if ($length > $this->maxColSize) { |
| 80 | $this->maxColSize = $length; |
| 81 | } |
| 82 | } |
| 83 | ); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Stringify an array |
| 88 | */ |
| 89 | public function toString(): string |
| 90 | { |
| 91 | $this->traverse($this->array->data); |
| 92 | |
| 93 | return "[{$this->string}]\n"; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Traverse an array and render as string |
| 98 | */ |
| 99 | private function traverse(array $array): void |
| 100 | { |
| 101 | $count = count($array); |
| 102 | |
| 103 | $this->indent++; |
| 104 | |
| 105 | array_walk( |
| 106 | $array, |
| 107 | function ($item, $key) use ($count): void { |
| 108 | if (\is_array($item)) { |
| 109 | if ($key > 0) { |
| 110 | $this->string .= PHP_EOL . $this->indent(); |
| 111 | } |
| 112 | |
| 113 | $this->string .= '['; |
| 114 | $this->traverse($item); |
| 115 | $this->string .= ']'; |
| 116 | } else { |
| 117 | $this->string .= $this->formatNumber( |
| 118 | $item, |
| 119 | $key === $count - 1 |
| 120 | ); |
| 121 | } |
| 122 | } |
| 123 | ); |
| 124 | |
| 125 | $this->indent--; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Format a number with column sizing |
| 130 | * |
| 131 | * @param mixed $number |
| 132 | */ |
| 133 | private function formatNumber($number, bool $last): string |
| 134 | { |
| 135 | switch (true) { |
| 136 | case $number === null: |
| 137 | $number = 'null'; |
| 138 | break; |
| 139 | case $number === true: |
| 140 | $number = 'true'; |
| 141 | break; |
| 142 | case $number === false: |
| 143 | $number = 'false'; |
| 144 | break; |
| 145 | default: # Workaround for code coverage |
| 146 | } |
| 147 | |
| 148 | $representation = $number; |
| 149 | |
| 150 | // Format positive numbers |
| 151 | if (is_numeric($number)) { |
| 152 | // Number is not negative, but there are some |
| 153 | if ($this->negative && $number >= 0) { |
| 154 | $representation = ' ' . $representation; |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | return $last |
| 159 | ? sprintf("%-{$this->maxColSize}s", $representation) |
| 160 | : sprintf("%-{$this->maxColSize}s ", $representation); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Render an indent |
| 165 | */ |
| 166 | private function indent(): string |
| 167 | { |
| 168 | return str_repeat(' ', $this->indent); |
| 169 | } |
| 170 | } |