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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 to create a function for which the value depends on pattern matching. |
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* |
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* You pass the various parameters your function except separated |
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* by spaces, the helper will automatically transform this to accept |
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* an array as parameter by replacing all spaces with commas. |
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* |
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* This means you cannot use any space in your patterns. |
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* |
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* @param array $patterns |
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* @return \Closure|callable |
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*/ |
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function func(array $patterns) |
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{ |
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$array_patterns = array_combine(array_map(function($k) { |
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return '['.implode(', ', explode(' ', $k)).']'; |
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}, array_keys($patterns)), array_values($patterns)); |
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return function(...$args) use($array_patterns) { |
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return match(func_get_args(), $array_patterns); |
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}; |
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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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* The given string will be trimmed as will all values in the |
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* resulting array. An empty string will result in an empty |
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* array. If at any time a string that should be added to the |
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* result is empty, the function will return false instead. |
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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 $string the string to split |
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* @return array|string[]|bool The split result, false if any of the value was empty |
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*/ |
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function split_enclosed($delimiter, $open, $close, $string) |
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{ |
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$string = trim($string); |
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if(strlen($string) === 0) { |
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return []; |
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} |
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$chars = str_split($string); |
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$result = array_reduce($chars, function($acc, $c) use($delimiter, $open, $close) { |
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if($acc === false) { |
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return $acc; |
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} |
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switch($c) { |
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case $delimiter: |
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if($acc[2] === 0) { |
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return strlen(trim($acc[1])) === 0 ? |
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false : |
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[array_merge($acc[0], [trim($acc[1])]), '', 0]; |
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} |
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break; |
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case $open: |
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return [$acc[0], $acc[1].$c, $acc[2] + 1]; |
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case $close: |
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return [$acc[0], $acc[1].$c, $acc[2] - 1]; |
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} |
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return [$acc[0], $acc[1].$c, $acc[2]]; |
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}, [[], '', 0]); |
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if($result === false || strlen(trim($result[1])) === 0) { |
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return false; |
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} |
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return array_merge($result[0], [trim($result[1])]); |
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} |
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functional-php /
pattern-matching
Loading history...
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.