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1 | <?php |
2 | |
3 | namespace pvc\html\attribute; |
4 | |
5 | use pvc\html\err\InvalidAttributeValueException; |
6 | use pvc\html\err\UnsetAttributeValueException; |
7 | use pvc\interfaces\html\attribute\AttributeWithValueInterface; |
8 | use pvc\interfaces\html\attribute\DataType; |
9 | use pvc\interfaces\validator\ValTesterInterface; |
10 | use pvc\validator\val_tester\null_empty\IsNotEmptyTester; |
11 | |
12 | /** |
13 | * @phpstan-import-type ValueType from AttributeWithValueInterface |
14 | */ |
15 | abstract class AttributeWithValue extends Attribute |
16 | { |
17 | /** |
18 | * @var DataType |
19 | */ |
20 | protected DataType $dataType; |
21 | |
22 | /** |
23 | * @var bool |
24 | * many (most?) attributes values are not case-sensitive, but some are. A good example is the 'id' |
25 | * attribute. |
26 | */ |
27 | protected bool $isCaseSensitive; |
28 | |
29 | |
30 | /** |
31 | * @var ValTesterInterface<ValueType> |
32 | * |
33 | * Attributes usually accept values whose validity can be determined in a context free manner. But there |
34 | * are a few values which are context-sensitive. For example, the 'for' attribute has value(s) which are id(s) |
35 | * of other elements within the same structural block. The ValTester object is a context free tester, because |
36 | * it knows nothing about other attributes and elements which are outside its own scope. |
37 | */ |
38 | protected ValTesterInterface $tester; |
39 | |
40 | /** |
41 | * @var array<ValueType> |
42 | * multivalued attributes and custom attributes can have more than one |
43 | * parameter. All values are stored in array for all attribute types. For |
44 | * singlevalued attributes and void attributes, the length of the array is 1. |
45 | */ |
46 | protected array $values; |
47 | |
48 | /** |
49 | * @param string $name |
50 | * @param DataType $dataType |
51 | * @param bool $caseSensitive |
52 | * @param ValTesterInterface<ValueType>|null $tester |
53 | */ |
54 | public function __construct( |
55 | string $name, |
56 | DataType $dataType, |
57 | ?bool $caseSensitive = null, |
58 | ?ValTesterInterface $tester = null, |
59 | ) { |
60 | parent::__construct($name); |
61 | $this->dataType = $dataType; |
62 | $this->isCaseSensitive = $caseSensitive ?? false; |
63 | $this->tester = $tester ?? new IsNotEmptyTester(); |
64 | } |
65 | |
66 | /** |
67 | * @param array<ValueType> $values |
68 | * |
69 | * @return void |
70 | * |
71 | * all attributes must have a value (void attributes have a value of |
72 | * true) if they are to be rendered. Subclasses for single-valued and |
73 | * void attributes confirm the parameter count is exactly 1. |
74 | */ |
75 | abstract protected function confirmParameterCount(array $values): void; |
76 | |
77 | /** |
78 | * @return array<ValueType>|ValueType|null |
79 | * |
80 | * most attributes are single-valued. Keeping the getter in this class makes |
81 | * testing the abstract class easier (at the moment). It is overridden |
82 | * in the multivalued attribute class. |
83 | */ |
84 | public function getValue() |
85 | { |
86 | return $this->values[0] ?? null; |
87 | } |
88 | /** |
89 | * @param ValueType ...$values |
90 | * |
91 | * @return void |
92 | * @throws InvalidAttributeValueException |
93 | */ |
94 | public function setValue(...$values): void |
95 | { |
96 | /** |
97 | * confirm the parameter count. |
98 | */ |
99 | $this->confirmParameterCount($values); |
100 | |
101 | /** |
102 | * confirm the data type and value. String values are potentially subject |
103 | * to case conversion, so build a new array of (possibly case-converted) |
104 | * values before setting the $value attribute in this object |
105 | */ |
106 | $newValues = []; |
107 | |
108 | $callback = match ($this->dataType) { |
109 | DataType::Integer => 'is_integer', |
110 | DataType::String => 'is_string', |
111 | }; |
112 | |
113 | foreach ($values as $value) { |
114 | |
115 | if (!$callback($value)) { |
116 | throw new InvalidAttributeValueException($this->name, $value); |
117 | } |
118 | |
119 | /** |
120 | * if the value is not case-sensitive, set it to lower case |
121 | */ |
122 | if (is_string($value) && !$this->isCaseSensitive) { |
123 | $value = strtolower($value); |
124 | } |
125 | /** |
126 | * value must be validated by the tester. |
127 | */ |
128 | if (!$this->tester->testValue($value)) { |
129 | throw new InvalidAttributeValueException($this->getName(), $value); |
130 | } |
131 | $newValues[] = $value; |
132 | } |
133 | $this->values = $newValues; |
134 | } |
135 | /** |
136 | * @return string |
137 | */ |
138 | function render(): string |
139 | { |
140 | if (null === $this->getValue()) { |
141 | throw new UnsetAttributeValueException($this->getName()); |
142 | } |
143 | return $this->name . '=\'' . implode(' ', $this->values) . '\''; |
144 | } |
145 | } |