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<?php |
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namespace PHPFunctional\PatternMatching; |
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class Matcher |
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{ |
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private static $reserved = ['true', 'false']; |
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private static $rules = [ |
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'/^(true|false)$/i' => '_parseBooleanConstant', |
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'/^([\'"])(?:(?!\\1).)*\\1$/' => '_parseStringConstant', |
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'/^[a-zA-Z]+$/' => '_parseIdentifier', |
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'/^_$/' => '_parseWildcard', |
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'/^\\[.*\\]$/' => '_parseArray', |
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'/^\\([^:]+:.+\\)$/' => '_parseCons', |
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'/^[a-zA-Z]+@.+$/' => '_parseAs', |
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]; |
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private static function _parseBooleanConstant($value, $pattern) |
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{ |
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$pattern_value = strtoupper($pattern) === 'TRUE' ? true : false; |
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return is_bool($value) && $value === $pattern_value ? [] : false; |
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} |
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private static function _parseStringConstant($value, $pattern) |
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{ |
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$string_pattern = substr($pattern, 1, -1); |
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return is_string($value) && $string_pattern == $value ? [] : false; |
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} |
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private static function _parseIdentifier($value, $pattern) |
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{ |
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return in_array(strtolower($pattern), self::$reserved) ? false : [$value]; |
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} |
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private static function _parseWildcard($value, $pattern) |
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{ |
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return []; |
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} |
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private static function _parseArray($value, $pattern) |
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{ |
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if(! is_array($value)) { |
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return false; |
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} |
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$patterns = array_filter(array_map('trim', split_enclosed(',', '[', ']', substr($pattern, 1, -1)))); |
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if(count($patterns) === 0) { |
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return count($value) === 0 ? [] : false; |
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} |
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if(count($patterns) > count($value)) { |
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return false; |
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} |
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$index = 0; |
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$results = []; |
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foreach($value as $v) { |
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$new = self::parse($v, $patterns[$index]); |
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if($new === false) { |
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return false; |
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} |
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$results = array_merge($results, $new); |
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++$index; |
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} |
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return $results; |
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} |
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private static function _parseCons($value, $pattern) |
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{ |
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if(! is_array($value)) { |
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return false; |
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} |
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$patterns = array_filter(array_map('trim', split_enclosed(':', '(', ')', substr($pattern, 1, -1)))); |
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$last = array_pop($patterns); |
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$results = []; |
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foreach($patterns as $p) { |
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if(count($value) == 0) { |
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return false; |
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} |
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$new = self::parse(array_shift($value), $p); |
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if($new === false) { |
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return false; |
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} |
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$results = array_merge($results, $new); |
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} |
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$new = self::parse($value, $last); |
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return $new === false ? false : array_merge($results, $new); |
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} |
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private static function _parseAs($value, $pattern) |
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{ |
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$patterns = explode('@', $pattern, 2); |
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$rest = self::parse($value, $patterns[1]); |
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return $rest === false ? false : array_merge([$value], $rest); |
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} |
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/** |
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* @param mixed $value |
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* @param string $pattern |
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* @return bool|array |
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*/ |
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private static function parse($value, $pattern) |
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{ |
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$pattern = trim($pattern); |
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if(is_numeric($pattern) && is_numeric($value)) { |
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return $pattern == $value ? [] : false; |
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} |
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foreach(self::$rules as $regex => $method) { |
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if(preg_match($regex, $pattern)) { |
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$arguments = call_user_func_array(['static', $method], [$value, $pattern]); |
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if($arguments !== false) { |
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return $arguments; |
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} |
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} |
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} |
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return false; |
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} |
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/** |
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* @param mixed $value |
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* @param array $patterns |
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* @return mixed |
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*/ |
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public static function match($value, array $patterns) |
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{ |
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foreach($patterns as $pattern => $callback) { |
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$match = self::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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} |
functional-php /
pattern-matching
