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<?php |
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namespace Yiisoft\Aliases; |
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final class Aliases |
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{ |
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private array $aliases = []; |
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/** |
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* @param array $config |
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* @throws \InvalidArgumentException if $path is an invalid alias. |
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* @see set() |
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* @see get() |
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*/ |
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public function __construct(array $config = []) |
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{ |
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foreach ($config as $alias => $path) { |
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$this->set($alias, $path); |
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} |
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} |
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/** |
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* Magic setter to enable simple aliases configuration. |
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* @param string $name |
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* @param string $value |
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*/ |
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public function __set(string $name, string $value): void |
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{ |
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$this->set($name, $value); |
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} |
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/** |
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* Registers a path alias. |
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* |
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* A path alias is a short name representing a long path (a file path, a URL, etc.) |
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* For example, we use '@yii' as the alias of the path to the Yii framework directory. |
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* |
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* A path alias must start with the character '@' so that it can be easily differentiated |
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* from non-alias paths. |
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* |
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* Note that this method does not check if the given path exists or not. All it does is |
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* to associate the alias with the path. |
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* |
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* Any trailing '/' and '\' characters in the given path will be trimmed. |
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* |
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* See the [guide article on aliases](guide:concept-aliases) for more information. |
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* |
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* @param string $alias the alias name (e.g. "@yii"). It must start with a '@' character. |
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* It may contain the forward slash '/' which serves as boundary character when performing |
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* alias translation by {@see get()}. |
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* @param string $path the path corresponding to the alias. If this is null, the alias will |
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* be removed. Trailing '/' and '\' characters will be trimmed. This can be |
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* |
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* - a directory or a file path (e.g. `/tmp`, `/tmp/main.txt`) |
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* - a URL (e.g. `http://www.yiiframework.com`) |
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* - a path alias (e.g. `@yii/base`). It will be resolved on {@see get()} call. |
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* |
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* @see get() |
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*/ |
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public function set(string $alias, ?string $path): void |
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{ |
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if (!$this->isAlias($alias)) { |
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$alias = '@' . $alias; |
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} |
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$pos = strpos($alias, '/'); |
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$root = $pos === false ? $alias : substr($alias, 0, $pos); |
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if ($path !== null) { |
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$path = rtrim($path, '\\/'); |
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if (!array_key_exists($root, $this->aliases)) { |
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if ($pos === false) { |
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$this->aliases[$root] = $path; |
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} else { |
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$this->aliases[$root] = [$alias => $path]; |
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} |
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} elseif (\is_string($this->aliases[$root])) { |
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if ($pos === false) { |
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$this->aliases[$root] = $path; |
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} else { |
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$this->aliases[$root] = [ |
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$alias => $path, |
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$root => $this->aliases[$root], |
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]; |
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} |
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} else { |
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$this->aliases[$root][$alias] = $path; |
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krsort($this->aliases[$root]); |
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} |
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} elseif (array_key_exists($root, $this->aliases)) { |
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if (\is_array($this->aliases[$root])) { |
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unset($this->aliases[$root][$alias]); |
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} elseif ($pos === false) { |
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unset($this->aliases[$root]); |
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} |
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} |
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} |
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/** |
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* Translates a path alias into an actual path. |
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* |
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* The translation is done according to the following procedure: |
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* |
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* 1. If the given alias does not start with '@', it is returned back without change; |
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* 2. Otherwise, look for the longest registered alias that matches the beginning part |
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* of the given alias. If it exists, replace the matching part of the given alias with |
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* the corresponding registered path. |
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* 3. Throw an exception if path alias can not be resolved. |
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* |
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* For example, by default '@yii' is registered as the alias to the Yii framework directory, |
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* say '/path/to/yii'. The alias '@yii/web' would then be translated into '/path/to/yii/web'. |
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* |
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* If you have registered two aliases '@foo' and '@foo/bar'. Then translating '@foo/bar/config' |
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* would replace the part '@foo/bar' (instead of '@foo') with the corresponding registered path. |
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* This is because the longest alias takes precedence. |
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* |
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* However, if the alias to be translated is '@foo/barbar/config', then '@foo' will be replaced |
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* instead of '@foo/bar', because '/' serves as the boundary character. |
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* |
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* Note, this method does not check if the returned path exists or not. |
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* |
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* See the [guide article on aliases](guide:concept-aliases) for more information. |
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* |
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* @param string $alias the alias to be translated. |
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* @return string the path corresponding to the alias. |
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* @throws \InvalidArgumentException if the root alias is not previously registered. |
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* @see setAlias() |
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*/ |
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public function get(string $alias): string |
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{ |
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if (!$this->isAlias($alias)) { |
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return $alias; |
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} |
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$result = $this->findAlias($alias); |
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if (\is_array($result)) { |
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$parts = $this->findAlias($result['path']); |
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if ($parts === null) { |
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return $result['path']; |
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} |
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return $this->get($parts['path']); |
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} |
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throw new \InvalidArgumentException("Invalid path alias: $alias"); |
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} |
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/** |
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* Returns the root alias part of a given alias. |
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* A root alias is an alias that has been registered via {@see set()} previously. |
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* If a given alias matches multiple root aliases, the longest one will be returned. |
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* @param string $alias the alias |
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* @return string the root alias, or null if no root alias is found |
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*/ |
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public function getRoot(string $alias): ?string |
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{ |
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$result = $this->findAlias($alias); |
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if (\is_array($result)) { |
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$result = $result['root']; |
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} |
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return $result; |
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} |
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private function findAlias(string $alias): ?array |
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{ |
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$pos = strpos($alias, '/'); |
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$root = $pos === false ? $alias : substr($alias, 0, $pos); |
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if (array_key_exists($root, $this->aliases)) { |
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if (\is_string($this->aliases[$root])) { |
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return [ |
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'root' => $root, |
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'path' => $pos === false |
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? $this->aliases[$root] |
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: $this->aliases[$root] . substr($alias, $pos) |
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]; |
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} |
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foreach ($this->aliases[$root] as $name => $path) { |
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if (strpos($alias . '/', $name . '/') === 0) { |
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return [ |
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'root' => $name, |
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'path' => $path . substr($alias, strlen($name)) |
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]; |
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} |
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} |
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} |
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return null; |
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} |
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/** |
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* Returns all path aliases translated into an actual paths. |
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* @return array Actual paths indexed by alias name. |
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*/ |
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public function getAll(): array |
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{ |
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$result = []; |
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foreach ($this->aliases as $name => $path) { |
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$result[$name] = $this->get($path); |
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} |
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return $result; |
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} |
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private function isAlias(string $alias): bool |
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{ |
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return !strncmp($alias, '@', 1); |
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} |
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} |
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yiisoft /
aliases
