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1 | <?php |
2 | /** |
3 | * LabelBuilder.php |
4 | * |
5 | * This file is part of the Codex design system, the official design system |
6 | * for Wikimedia projects. It provides the `Label` class, a builder for constructing |
7 | * label components using the Codex design system. |
8 | * |
9 | * A Label provides a descriptive title for a form input. Having labels is essential when filling out |
10 | * a form, since each field is associated with its label. |
11 | * |
12 | * @category Builder |
13 | * @package Codex\Builder |
14 | * @since 0.1.0 |
15 | * @author Doğu Abaris <abaris@null.net> |
16 | * @license https://www.gnu.org/copyleft/gpl.html GPL-2.0-or-later |
17 | * @link https://doc.wikimedia.org/codex/main/ Codex Documentation |
18 | */ |
19 | |
20 | namespace Wikimedia\Codex\Builder; |
21 | |
22 | use InvalidArgumentException; |
23 | use Wikimedia\Codex\Component\Label; |
24 | use Wikimedia\Codex\Renderer\LabelRenderer; |
25 | |
26 | /** |
27 | * LabelBuilder |
28 | * |
29 | * This class implements the builder pattern to construct instances of Label. |
30 | * It provides a fluent interface for setting various properties and building the |
31 | * final immutable object with predefined configurations and immutability. |
32 | * |
33 | * @category Builder |
34 | * @package Codex\Builder |
35 | * @since 0.1.0 |
36 | * @author Doğu Abaris <abaris@null.net> |
37 | * @license https://www.gnu.org/copyleft/gpl.html GPL-2.0-or-later |
38 | * @link https://doc.wikimedia.org/codex/main/ Codex Documentation |
39 | */ |
40 | class LabelBuilder { |
41 | |
42 | /** |
43 | * The text displayed inside the label. |
44 | */ |
45 | protected string $labelText = ''; |
46 | |
47 | /** |
48 | * The ID of the input/control this label is associated with. |
49 | */ |
50 | protected string $inputId = ''; |
51 | |
52 | /** |
53 | * Whether the associated input field is optional. |
54 | */ |
55 | protected bool $optional = false; |
56 | |
57 | /** |
58 | * Whether the label should be visually hidden but accessible to screen readers. |
59 | */ |
60 | protected bool $visuallyHidden = false; |
61 | |
62 | /** |
63 | * Whether the label should be rendered as a `<legend>` element, typically used within a `<fieldset>`. |
64 | */ |
65 | protected bool $isLegend = false; |
66 | |
67 | /** |
68 | * The description text that provides additional information about the input field. |
69 | */ |
70 | protected string $description = ''; |
71 | |
72 | /** |
73 | * The ID of the description element, useful for the `aria-describedby` attribute. |
74 | */ |
75 | protected ?string $descriptionId = null; |
76 | |
77 | /** |
78 | * Whether the label is for a disabled field or input. |
79 | */ |
80 | protected bool $disabled = false; |
81 | |
82 | /** |
83 | * The CSS class for an icon displayed before the label text. |
84 | */ |
85 | protected ?string $iconClass = null; |
86 | |
87 | /** |
88 | * Additional HTML attributes for the label element. |
89 | */ |
90 | protected array $attributes = []; |
91 | |
92 | /** |
93 | * The ID attribute for the label. |
94 | */ |
95 | protected ?string $id = null; |
96 | |
97 | /** |
98 | * The renderer instance used to render the label. |
99 | */ |
100 | protected LabelRenderer $renderer; |
101 | |
102 | /** |
103 | * Constructor for the Label class. |
104 | * |
105 | * @param LabelRenderer $renderer The renderer to use for rendering the label. |
106 | */ |
107 | public function __construct( LabelRenderer $renderer ) { |
108 | $this->renderer = $renderer; |
109 | } |
110 | |
111 | /** |
112 | * Set the label text. |
113 | * |
114 | * This method specifies the text that will be displayed inside the label. |
115 | * The label text provides a descriptive title for the associated input field. |
116 | * |
117 | * @since 0.1.0 |
118 | * @param string $labelText The text of the label. |
119 | * @return $this Returns the Label instance for method chaining. |
120 | */ |
121 | public function setLabelText( string $labelText ): self { |
122 | if ( trim( $labelText ) === '' ) { |
123 | throw new InvalidArgumentException( "Label text cannot be empty." ); |
124 | } |
125 | $this->labelText = $labelText; |
126 | |
127 | return $this; |
128 | } |
129 | |
130 | /** |
131 | * Set the ID of the input/control this label is associated with. |
132 | * |
133 | * This method sets the 'for' attribute of the label, linking it to an input element. |
134 | * This connection is important for accessibility and ensures that clicking the label focuses the input. |
135 | * |
136 | * Example usage: |
137 | * |
138 | * $label->setInputId('username'); |
139 | * |
140 | * @since 0.1.0 |
141 | * @param string $inputId The ID of the input element. |
142 | * @return $this Returns the Label instance for method chaining. |
143 | */ |
144 | public function setInputId( string $inputId ): self { |
145 | $this->inputId = $inputId; |
146 | |
147 | return $this; |
148 | } |
149 | |
150 | /** |
151 | * Set the optional flag. |
152 | * |
153 | * This method indicates whether the associated input field is optional. |
154 | * If true, an "(optional)" flag will be displayed next to the label text. |
155 | * |
156 | * Example usage: |
157 | * |
158 | * $label->setOptionalFlag(true); |
159 | * |
160 | * @since 0.1.0 |
161 | * @param bool $optional Whether the label is for an optional input. |
162 | * @return $this Returns the Label instance for method chaining. |
163 | */ |
164 | public function setOptional( bool $optional ): self { |
165 | $this->optional = $optional; |
166 | |
167 | return $this; |
168 | } |
169 | |
170 | /** |
171 | * Set whether the label should be visually hidden. |
172 | * |
173 | * This method determines whether the label should be visually hidden while still being accessible to screen |
174 | * readers. Useful for forms where labels need to be read by assistive technologies but not displayed. |
175 | * |
176 | * Example usage: |
177 | * |
178 | * $label->setVisuallyHidden(true); |
179 | * |
180 | * @since 0.1.0 |
181 | * @param bool $visuallyHidden Whether the label should be visually hidden. |
182 | * @return $this Returns the Label instance for method chaining. |
183 | */ |
184 | public function setVisuallyHidden( bool $visuallyHidden ): self { |
185 | $this->visuallyHidden = $visuallyHidden; |
186 | |
187 | return $this; |
188 | } |
189 | |
190 | /** |
191 | * Set whether this component should output a `<legend>` element. |
192 | * |
193 | * This method determines whether the label should be rendered as a `<legend>` element, |
194 | * typically used within a `<fieldset>` for grouping related inputs. |
195 | * |
196 | * Example usage: |
197 | * |
198 | * $label->setIsLegend(true); |
199 | * |
200 | * @since 0.1.0 |
201 | * @param bool $isLegend Whether to render the label as a `<legend>`. |
202 | * @return $this Returns the Label instance for method chaining. |
203 | */ |
204 | public function setIsLegend( bool $isLegend ): self { |
205 | $this->isLegend = $isLegend; |
206 | |
207 | return $this; |
208 | } |
209 | |
210 | /** |
211 | * Set the description text for the label. |
212 | * |
213 | * This method adds a short description below the label, providing additional information about the input field. |
214 | * The description is linked to the input via the `aria-describedby` attribute for accessibility. |
215 | * |
216 | * Example usage: |
217 | * |
218 | * $label->setDescriptionText('Please enter a valid email.'); |
219 | * |
220 | * @since 0.1.0 |
221 | * @param string $description The description text for the label. |
222 | * @return $this Returns the Label instance for method chaining. |
223 | */ |
224 | public function setDescription( string $description ): self { |
225 | $this->description = $description; |
226 | |
227 | return $this; |
228 | } |
229 | |
230 | /** |
231 | * Set the ID of the description element. |
232 | * |
233 | * This method sets the ID attribute for the description element, which is useful for associating |
234 | * the description with an input via the `aria-describedby` attribute. |
235 | * |
236 | * Example usage: |
237 | * |
238 | * $label->setDescriptionId('username-desc'); |
239 | * |
240 | * @since 0.1.0 |
241 | * @param string|null $descriptionId The ID for the description element. |
242 | * @return $this Returns the Label instance for method chaining. |
243 | */ |
244 | public function setDescriptionId( ?string $descriptionId ): self { |
245 | $this->descriptionId = $descriptionId ?: null; |
246 | |
247 | return $this; |
248 | } |
249 | |
250 | /** |
251 | * Set whether the label is for a disabled field or input. |
252 | * |
253 | * This method marks the label as associated with a disabled input, applying the appropriate styles. |
254 | * |
255 | * Example usage: |
256 | * |
257 | * $label->setDisabled(true); |
258 | * |
259 | * @since 0.1.0 |
260 | * @param bool $disabled Whether the label is for a disabled input. |
261 | * @return $this Returns the Label instance for method chaining. |
262 | */ |
263 | public function setDisabled( bool $disabled ): self { |
264 | $this->disabled = $disabled; |
265 | |
266 | return $this; |
267 | } |
268 | |
269 | /** |
270 | * Set an icon before the label text. |
271 | * |
272 | * This method allows for an icon to be displayed before the label text, specified by a CSS class. |
273 | * The icon enhances the visual appearance of the label. |
274 | * |
275 | * Example usage: |
276 | * |
277 | * $label->setIcon('icon-class-name'); |
278 | * |
279 | * @since 0.1.0 |
280 | * @param string|null $iconClass The CSS class for the icon. |
281 | * @return $this Returns the Label instance for method chaining. |
282 | */ |
283 | public function setIconClass( ?string $iconClass ): self { |
284 | $this->iconClass = $iconClass; |
285 | |
286 | return $this; |
287 | } |
288 | |
289 | /** |
290 | * Set additional HTML attributes for the label element. |
291 | * |
292 | * This method allows custom HTML attributes to be added to the label element, such as `id`, `class`, or `data-*` |
293 | * attributes. These attributes are automatically escaped to prevent XSS vulnerabilities. |
294 | * |
295 | * Example usage: |
296 | * |
297 | * $label->setAttributes(['class' => 'custom-label-class', 'data-info' => 'additional-info']); |
298 | * |
299 | * @since 0.1.0 |
300 | * @param array $attributes An associative array of HTML attributes. |
301 | * @return $this Returns the Label instance for method chaining. |
302 | */ |
303 | public function setAttributes( array $attributes ): self { |
304 | foreach ( $attributes as $key => $value ) { |
305 | $this->attributes[$key] = $value; |
306 | } |
307 | |
308 | return $this; |
309 | } |
310 | |
311 | /** |
312 | * Set the label's HTML ID attribute. |
313 | * |
314 | * @since 0.1.0 |
315 | * @param string $id The ID for the label element. |
316 | * @return $this |
317 | */ |
318 | public function setId( string $id ): self { |
319 | $this->id = $id; |
320 | |
321 | return $this; |
322 | } |
323 | |
324 | /** |
325 | * Build and return the Label component object. |
326 | * This method constructs the immutable Label object with all the properties set via the builder. |
327 | * |
328 | * @since 0.1.0 |
329 | * @return Label The constructed Label. |
330 | */ |
331 | public function build(): Label { |
332 | if ( !$this->labelText ) { |
333 | throw new InvalidArgumentException( "The 'labelText' is required for Label." ); |
334 | } |
335 | |
336 | return new Label( |
337 | $this->labelText, |
338 | $this->inputId, |
339 | $this->optional, |
340 | $this->visuallyHidden, |
341 | $this->isLegend, |
342 | $this->description, |
343 | $this->descriptionId, |
344 | $this->disabled, |
345 | $this->iconClass, |
346 | $this->attributes, |
347 | $this->id, |
348 | $this->renderer, |
349 | ); |
350 | } |
351 | } |