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Infer type of property based on what was passed to object constructor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| <?php | ||
| namespace Lib; | ||
|
|
||
| /** | ||
| * Basically the same thing as Rust's std::Result is, only using PHP Exceptions | ||
| */ | ||
| class Result | ||
| { | ||
| public $isOk; | ||
| public $result; | ||
| public $error; | ||
|
|
||
| public static function makeOk($result) | ||
| { | ||
| return new self(true, $result); | ||
| } | ||
|
|
||
| public static function makeError(\Exception $error) | ||
| { | ||
| return new self(false, null, $error); | ||
| } | ||
|
|
||
| private function __construct($isOk, $result, \Exception $error = null) | ||
| { | ||
| if (!$isOk && is_null($error)) { | ||
| $error = new \Exception('Result Error'); | ||
| } | ||
|
|
||
| $this->isOk = $isOk; | ||
| $this->result = $result; | ||
| $this->error = $error; | ||
| } | ||
|
|
||
| public function isOk() | ||
| { | ||
| return $this->isOk; | ||
| } | ||
|
|
||
| public function unwrap() | ||
| { | ||
| if ($this->isOk()) { | ||
| return $this->result; | ||
| } else { | ||
| throw $this->error; | ||
| } | ||
| } | ||
|
|
||
| public function getUsingDefault($default = null) | ||
| { | ||
| if ($this->isOk()) { | ||
| return $this->result; | ||
| } else { | ||
| return $default; | ||
| } | ||
| } | ||
|
|
||
| /** @return \Exception */ | ||
| public function getErrorUsingDefault($default = null) | ||
| { | ||
| if ($this->isOk()) { | ||
| return $default; | ||
| } else { | ||
| return $this->error; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @param \Closure $mapper - returns new Result | ||
| * @return Result - same if was error or mapped if ok | ||
| */ | ||
| public function flatMap(\Closure $mapper): Result | ||
| { | ||
| return $this->isOk() ? $mapper($this->unwrap()) : $this; | ||
| } | ||
|
|
||
| public function __toString() | ||
| { | ||
| if ($this->isOk()) { | ||
| return 'Result<Ok:'.strval($this->result).'>'; | ||
| } else { | ||
| return 'Result<Error>'; | ||
| } | ||
| } | ||
| } |
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