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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Boiler; |
| 6 | |
| 7 | use Celema\Boiler\Exception\LogicException; |
| 8 | use Celema\Boiler\Exception\LookupException; |
| 9 | use Celema\Boiler\Exception\RuntimeException; |
| 10 | use Celema\Boiler\Proxy\ArrayProxy; |
| 11 | use Celema\Boiler\Proxy\Proxy; |
| 12 | use Celema\Boiler\Proxy\StringProxy; |
| 13 | use Closure; |
| 14 | use Stringable; |
| 15 | |
| 16 | /** |
| 17 | * The `$this` of template code: the template helpers and the registered |
| 18 | * template methods. |
| 19 | * |
| 20 | * Templates run in the scope of this object, so a method of any visibility |
| 21 | * here would shadow a registered template method of the same name. Keep |
| 22 | * helper code in Rendering and Values instead of private methods. |
| 23 | * |
| 24 | * @api |
| 25 | */ |
| 26 | final class Context |
| 27 | { |
| 28 | /** @var list<class-string> */ |
| 29 | public readonly array $trusted; |
| 30 | public readonly bool $autoescape; |
| 31 | private readonly Values $values; |
| 32 | |
| 33 | /** |
| 34 | * @internal Templates receive their context; they never create one. |
| 35 | * |
| 36 | * @param array<array-key, mixed> $context |
| 37 | * @param bool $wrapped whether the context comes from a template of the render, with the values as that template got them |
| 38 | */ |
| 39 | public function __construct( |
| 40 | private readonly Rendering $rendering, |
| 41 | array $context, |
| 42 | bool $wrapped, |
| 43 | ) { |
| 44 | $this->trusted = $rendering->trusted; |
| 45 | $this->autoescape = $rendering->autoescape; |
| 46 | $this->values = new Values($context, $rendering->wrapper, $rendering->autoescape, $wrapped); |
| 47 | } |
| 48 | |
| 49 | /** @param array<array-key, mixed> $args */ |
| 50 | public function __call(string $name, array $args): mixed |
| 51 | { |
| 52 | $method = $this->rendering->methods->get($name); |
| 53 | |
| 54 | $args = $this->values->wrapper->unwrap($args); |
| 55 | |
| 56 | return $this->values->output(($method->callable)(...$args), safe: $method->safe); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * @param ArrayProxy|array<array-key, mixed> $values |
| 61 | * @return array<array-key, mixed> |
| 62 | */ |
| 63 | public function get(ArrayProxy|array $values = []): array |
| 64 | { |
| 65 | return $this->values->get($values); |
| 66 | } |
| 67 | |
| 68 | public function add(StringProxy|string $key, mixed $value): mixed |
| 69 | { |
| 70 | return $this->values->add($key, $value); |
| 71 | } |
| 72 | |
| 73 | public function escape(Stringable|string $value, StringProxy|string|null $escaper = null): string |
| 74 | { |
| 75 | // A proxy's string conversion escapes already, so escape its original. |
| 76 | $original = $value instanceof Proxy ? $value->unwrap() : $value; |
| 77 | |
| 78 | if (!is_string($original) && !$original instanceof Stringable) { |
| 79 | throw new RuntimeException('Value cannot be escaped as string'); |
| 80 | } |
| 81 | |
| 82 | return $this->values->wrapper->escape( |
| 83 | (string) $original, |
| 84 | $escaper === null ? null : Values::plain($escaper), |
| 85 | ); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * @param non-empty-string|StringProxy $path |
| 90 | * @param ArrayProxy|array<array-key, mixed> $context |
| 91 | */ |
| 92 | public function layout(StringProxy|string $path, ArrayProxy|array $context = []): void |
| 93 | { |
| 94 | $this->rendering->setLayout(new LayoutSpec(Values::plain($path), $this->rendering->location(), $context)); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Includes another template into the current template. |
| 99 | * |
| 100 | * If no context is passed it shares the context of the calling template. |
| 101 | * |
| 102 | * @param non-empty-string|StringProxy $path |
| 103 | * @param ArrayProxy|array<array-key, mixed> $context |
| 104 | */ |
| 105 | public function include(StringProxy|string $path, ArrayProxy|array $context = []): void |
| 106 | { |
| 107 | $file = $this->rendering->engine->resolve(Values::plain($path)); |
| 108 | |
| 109 | echo $this->rendering->include($file, $this->get($context)); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Includes another template with the output up to the matching `end()` |
| 114 | * as its slot, which it prints with `$this->slot()`. |
| 115 | * |
| 116 | * The block runs at the call site, before the included template renders. |
| 117 | * If no context is passed it shares the context of the calling template. |
| 118 | * |
| 119 | * @param non-empty-string|StringProxy $path |
| 120 | * @param ArrayProxy|array<array-key, mixed> $context |
| 121 | */ |
| 122 | public function component(StringProxy|string $path, ArrayProxy|array $context = []): void |
| 123 | { |
| 124 | $path = Values::plain($path); |
| 125 | // Resolved before the block runs, so a missing template fails at this call. |
| 126 | $file = $this->rendering->engine->resolve($path); |
| 127 | $context = $this->get($context); |
| 128 | |
| 129 | $this->rendering->capture('component', $path, function (string $content) use ($file, $context): void { |
| 130 | echo $this->rendering->include($file, $context, slot: $content); |
| 131 | }); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Returns what this template wraps: the page in a layout, or the block |
| 136 | * passed with `component()`. |
| 137 | * |
| 138 | * Throws when the template has no slot, such as one included with `include()`. |
| 139 | */ |
| 140 | public function slot(): string |
| 141 | { |
| 142 | $slot = $this->rendering->slot ?? throw new RuntimeException( |
| 143 | 'No slot was provided for this template', |
| 144 | location: $this->rendering->location(), |
| 145 | ); |
| 146 | |
| 147 | return $this->hasSlot() ? $slot : ''; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Whether there is a slot to print. Content of only whitespace counts as |
| 152 | * none, and `slot()` returns `''` for it. |
| 153 | */ |
| 154 | public function hasSlot(): bool |
| 155 | { |
| 156 | return trim($this->rendering->slot ?? '') !== ''; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Captures the output up to the matching `end()` as the content of a |
| 161 | * section, which `yield()` prints. |
| 162 | * |
| 163 | * In a layout, the capture is a default for the templates it wraps. Any |
| 164 | * other second capture fails the render at `end()`. |
| 165 | */ |
| 166 | public function section(StringProxy|string $name): void |
| 167 | { |
| 168 | $name = Values::plain($name); |
| 169 | $this->rendering->capture('section', $name, $this->rendering->sections->capture($name)); |
| 170 | } |
| 171 | |
| 172 | public function append(StringProxy|string $name): void |
| 173 | { |
| 174 | $name = Values::plain($name); |
| 175 | $this->rendering->capture('section', $name, $this->rendering->sections->append($name)); |
| 176 | } |
| 177 | |
| 178 | public function prepend(StringProxy|string $name): void |
| 179 | { |
| 180 | $name = Values::plain($name); |
| 181 | $this->rendering->capture('section', $name, $this->rendering->sections->prepend($name)); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Captures the output up to the matching `end()` as the new content of a |
| 186 | * section, replacing what it held so far, including appended and prepended |
| 187 | * content. Inside, `yield()` returns that content, so a layout can build |
| 188 | * on what the page wrote: `<?= $this->yield('title') ?> – Blog`. |
| 189 | */ |
| 190 | public function rewrite(StringProxy|string $name): void |
| 191 | { |
| 192 | $name = Values::plain($name); |
| 193 | $this->rendering->capture('section', $name, $this->rendering->sections->rewrite($name)); |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Closes the innermost open section or component. |
| 198 | * |
| 199 | * With a name, the render fails unless that is the section or component |
| 200 | * being closed, as passed to `section()` or `component()`. |
| 201 | */ |
| 202 | public function end(StringProxy|string|null $name = null): void |
| 203 | { |
| 204 | $this->rendering->close($name === null ? null : Values::plain($name)); |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Returns the content of a section: what was prepended, the main content |
| 209 | * or else the default, and what was appended. |
| 210 | * |
| 211 | * Without a default the section is required and a missing section throws; |
| 212 | * pass a default, even `''`, when it is optional. A closure default prints |
| 213 | * its content, such as an include, and runs only when no main content was |
| 214 | * captured. |
| 215 | * |
| 216 | * @param Stringable|string|Closure(): mixed|null $default |
| 217 | */ |
| 218 | public function yield(StringProxy|string $name, Stringable|string|Closure|null $default = null): string |
| 219 | { |
| 220 | $name = Values::plain($name); |
| 221 | $sections = $this->rendering->sections; |
| 222 | |
| 223 | if ($default instanceof Stringable) { |
| 224 | $default = (string) $default; |
| 225 | } |
| 226 | |
| 227 | if ($sections->writing($name)) { |
| 228 | throw new LogicException( |
| 229 | "Section `{$name}` cannot be printed inside a block that writes it; build on its content with rewrite()", |
| 230 | location: $this->rendering->location(), |
| 231 | ); |
| 232 | } |
| 233 | |
| 234 | if ($default === null && !$sections->has($name)) { |
| 235 | throw new LookupException( |
| 236 | "Section `{$name}` is not defined; pass a default, even '', when it is optional", |
| 237 | location: $this->rendering->location(), |
| 238 | ); |
| 239 | } |
| 240 | |
| 241 | $content = $sections->getOr( |
| 242 | $name, |
| 243 | $default instanceof Closure ? fn(): string => $this->rendering->output($default) : $default ?? '', |
| 244 | ); |
| 245 | |
| 246 | // Like slot(), content of only whitespace counts as none, so the result |
| 247 | // tells whether there is anything to print. |
| 248 | return trim($content) === '' ? '' : $content; |
| 249 | } |
| 250 | } |