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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * @author: Doug Wilbourne (dougwilbourne@gmail.com) |
| 5 | */ |
| 6 | declare(strict_types=1); |
| 7 | |
| 8 | namespace pvc\parser\numeric; |
| 9 | |
| 10 | use NumberFormatter; |
| 11 | use pvc\interfaces\intl\LocaleInterface; |
| 12 | use pvc\interfaces\msg\MsgInterface; |
| 13 | use pvc\parser\err\InvalidReturnTypeException; |
| 14 | use pvc\parser\Parser; |
| 15 | |
| 16 | /** |
| 17 | * Class NumericParser |
| 18 | * @extends Parser<DataType> |
| 19 | * @template DataType |
| 20 | * |
| 21 | * This is a wrapper for php's NumberFormatter class. The child classes of this class simply set up different |
| 22 | * flavors of NumberFormatter for some common scenarios. You can access the underlying NumberFormatter object and |
| 23 | * further manipulate it to accommodate whatever special use case you have. |
| 24 | * |
| 25 | * Unfortunately, the underlying NumberFormatter class is created with a non-optional locale argument which is |
| 26 | * immutable. This class exhibits the same behavior. The reason is that if we were to create new NumberFormatters |
| 27 | * each time a user changed the locale of this class, all other changes that were made to the old formatter would be |
| 28 | * lost. |
| 29 | */ |
| 30 | abstract class NumericParser extends Parser |
| 31 | { |
| 32 | protected NumberFormatter $frmtr; |
| 33 | |
| 34 | /** |
| 35 | * the locale attribute is 'de-normalized' in the sense that it is stored as an attribute but also embedded |
| 36 | * in the formatter at constrfuction time. It was tempting to just remove the attribute and have the getter |
| 37 | * return the locale from the formatter. BUT, we want to set and get a Locale object (pvc\intl\Locale), NOT a |
| 38 | * string, so we keep the object handy. |
| 39 | */ |
| 40 | |
| 41 | protected LocaleInterface $locale; |
| 42 | |
| 43 | protected int $returnType = NumberFormatter::TYPE_INT64; |
| 44 | |
| 45 | /** |
| 46 | * @var array <int> |
| 47 | * in this day and age we are not listing the 32 bit return types as being valid. Also, as of php 8.3. the |
| 48 | * currency type is deprecated. The only choices should be integer or float |
| 49 | */ |
| 50 | protected array $validReturnTypes = [ |
| 51 | NumberFormatter::TYPE_INT64, |
| 52 | NumberFormatter::TYPE_DOUBLE, |
| 53 | ]; |
| 54 | |
| 55 | public function __construct(MsgInterface $msg, LocaleInterface $locale, NumberFormatter $frmtr) |
| 56 | { |
| 57 | parent::__construct($msg); |
| 58 | $this->frmtr = $frmtr; |
| 59 | $this->locale = $locale; |
| 60 | /** |
| 61 | * grouping separator is allowed but not required |
| 62 | */ |
| 63 | $this->allowGroupingSeparator(true); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * allowGroupingSeparator |
| 68 | * @param bool $allowed |
| 69 | */ |
| 70 | public function allowGroupingSeparator(bool $allowed): void |
| 71 | { |
| 72 | if (!$allowed) { |
| 73 | $this->getFrmtr()->setAttribute(NumberFormatter::GROUPING_USED, 0); |
| 74 | } else { |
| 75 | $this->getFrmtr()->setAttribute(NumberFormatter::GROUPING_USED, 1); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | public function getFrmtr(): NumberFormatter |
| 80 | { |
| 81 | return $this->frmtr; |
| 82 | } |
| 83 | |
| 84 | public function getLocale(): LocaleInterface |
| 85 | { |
| 86 | return $this->locale; |
| 87 | } |
| 88 | |
| 89 | public function isGroupingSeparatorAllowed(): bool |
| 90 | { |
| 91 | return (bool)$this->getFrmtr()->getAttribute(NumberFormatter::GROUPING_USED); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * @function parseValue |
| 96 | * @param string $data |
| 97 | * @return bool |
| 98 | */ |
| 99 | public function parseValue(string $data): bool |
| 100 | { |
| 101 | $pos = 0; |
| 102 | $expectedPos = strlen($data); |
| 103 | /** @var DataType $result */ |
| 104 | $result = $this->frmtr->parse($data, $this->getReturnType(), $pos); |
| 105 | |
| 106 | /** |
| 107 | * NumberFormatter 'fails gracefully' if it successfully parses a part of a string, e.g. it will not throw |
| 108 | * an exception if it parses the first x characters of the string into the return type and can't parse any |
| 109 | * more from the x + 1 character to the end of the string. The $pos variable holds the offset of the last |
| 110 | * character successfully parsed. |
| 111 | */ |
| 112 | if (($pos == $expectedPos) && ($result !== false)) { |
| 113 | $this->parsedValue = $result; |
| 114 | return true; |
| 115 | } else { |
| 116 | $this->setMsgContent($this->msg); |
| 117 | return false; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * getReturnType |
| 123 | * @return int |
| 124 | * make integer the default return type |
| 125 | */ |
| 126 | public function getReturnType(): int |
| 127 | { |
| 128 | return $this->returnType; |
| 129 | } |
| 130 | |
| 131 | public function setReturnType(int $returnType): void |
| 132 | { |
| 133 | if (!in_array($returnType, $this->validReturnTypes)) { |
| 134 | throw new InvalidReturnTypeException(); |
| 135 | } |
| 136 | $this->returnType = $returnType; |
| 137 | } |
| 138 | } |