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<?php |
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namespace League\Plates\Template; |
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final class Theme |
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{ |
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private $dir; |
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private $name; |
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/** @var ?Theme */ |
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private $next; |
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private function __construct(string $dir, string $name) { |
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$this->dir = $dir; |
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$this->name = $name; |
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} |
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/** @param Theme[] $themes */ |
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public static function hierarchy(array $themes): Theme { |
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self::assertThemesForHierarchyAreNotEmpty($themes); |
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self::assertAllThemesInHierarchyAreLeafThemes($themes); |
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/** @var Theme $theme */ |
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$theme = array_reduce(array_slice($themes, 1), function(Theme $parent, Theme $child) { |
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$child->next = $parent; |
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return $child; |
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}, $themes[0]); |
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self::assertHierarchyContainsUniqueThemeNames($theme); |
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return $theme; |
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} |
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public static function new(string $dir, string $name = 'Default'): self { |
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return new self($dir, $name); |
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} |
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public function dir(): string { |
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return $this->dir; |
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} |
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public function name(): string { |
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return $this->name; |
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} |
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/** |
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* list all directories in the hierarchy from first to last |
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* @return Theme[] |
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*/ |
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public function listThemeHierarchy(): \Generator { |
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yield $this; |
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if ($this->next) { |
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yield from $this->next->listThemeHierarchy(); |
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} |
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} |
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/** @param Theme[] $themes */ |
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private static function assertThemesForHierarchyAreNotEmpty(array $themes) { |
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if (count($themes) === 0) { |
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throw new \RuntimeException('Empty theme hierarchies are not allowed.'); |
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} |
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} |
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/** @param Theme[] $themes */ |
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private static function assertAllThemesInHierarchyAreLeafThemes(array $themes) { |
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foreach ($themes as $theme) { |
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if ($theme->next) { |
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throw new \RuntimeException('Nested theme hierarchies are not allowed, make sure to use Theme::new when creating themes in your hierarchy. Theme ' . $theme->name . ' is already in a hierarchy.'); |
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} |
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} |
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} |
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private static function assertHierarchyContainsUniqueThemeNames(Theme $theme) { |
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$names = []; |
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foreach ($theme->listThemeHierarchy() as $theme) { |
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$names[] = $theme->name; |
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} |
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if (count(array_unique($names)) !== count($names)) { |
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throw new \RuntimeException('Duplicate theme names in hierarchies are not allowed. Received theme names: [' . implode(', ', $names) . '].'); |
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} |
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} |
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} |
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thephpleague /
plates
