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<?php |
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namespace FunctionalPHP\PatternMatching; |
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/** |
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* Destructure the given value using the given pattern, then returns |
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* the resulting values as an array indexed using the identifiers of |
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* the pattern. |
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* |
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* If the extraction failed, will return False. |
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* |
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* @param mixed $value |
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* @param string $pattern |
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* @return array|bool |
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*/ |
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function extract($value, $pattern) |
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{ |
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return (new Parser())->parse($value, $pattern); |
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} |
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/** |
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* Given a value and an array with the format <pattern> => <callback>, |
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* matches the value to the first pattern possible and execute the |
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* callback by passing the arguments destructured from the value. |
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* |
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* @param mixed $value |
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* @param array $patterns <pattern> => <callback> |
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* @return mixed |
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*/ |
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function match($value, array $patterns) |
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{ |
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$parser = new Parser(); |
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foreach($patterns as $pattern => $callback) { |
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$match = $parser->parse($value, $pattern); |
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if($match !== false) { |
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return is_callable($callback) ? |
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call_user_func_array($callback, $match) : |
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$callback; |
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} |
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} |
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throw new \RuntimeException('Non-exhaustive patterns.'); |
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} |
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/** |
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* Helper function to split a string using a given delimiter except |
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* if said delimiter is enclosed between two different characters. |
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* |
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* This won't work if the opening and closing character for the |
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* enclosure is the same (ie quotes), $open and $close need to |
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* be different. |
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* |
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* The enclosing can have multiple depth. Each opening character needs |
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* to be closed by exactly one closing character. No balancing is done. |
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* |
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* @param string $delimiter one character that will be the delimiter |
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* @param string $open one character that starts the enclosing |
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* @param string $close one character that stops the enclosing |
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* @param string $string the string to split |
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* @return array|string[] The split result. |
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*/ |
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function split_enclosed($delimiter, $open, $close, $string) |
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{ |
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$chars = str_split($string); |
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$result = []; |
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$buffer = ''; |
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$level = 0; |
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foreach($chars as $c) { |
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if($c === $delimiter && $level === 0) { |
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$result[] = $buffer; |
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$buffer = ''; |
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} else { |
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$buffer .= $c; |
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if($c === $open) { |
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++$level; |
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} else if($c === $close) { |
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--$level; |
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} |
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} |
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} |
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if(strlen($buffer) > 0) { |
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$result[] = $buffer; |
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} |
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return $result; |
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} |
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functional-php /
pattern-matching
This check compares the return type specified in the
@returnannotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.