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<?php |
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namespace FunctionalPHP\PatternMatching; |
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class Parser |
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{ |
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protected $reserved = ['true', 'false']; |
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protected $rules = [ |
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'/^(true|false)$/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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protected 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 === $pattern_value ? [] : false; |
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} |
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protected function _parseStringConstant($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 == $value ? [] : false; |
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} |
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protected function _parseIdentifier($value, $pattern) |
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{ |
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return in_array(strtolower($pattern), $this->reserved) ? false : [$pattern => $value]; |
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} |
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protected function _parseWildcard() |
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{ |
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return []; |
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} |
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protected function _parseArray($value, $pattern) |
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{ |
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$patterns = split_enclosed(',', '[', ']', substr($pattern, 1, -1)); |
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if($patterns === false) { |
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$this->_invalidPattern($pattern); |
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} |
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if(! is_array($value)) { |
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return false; |
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} |
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$count = count($patterns); |
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if($count === 0) { |
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return count($value) === 0 ? [] : false; |
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} |
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if($count > count($value)) { |
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return false; |
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} |
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return array_reduce($value, function($result, $v) use($patterns) { |
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if($result === false) { |
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return $result; |
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} |
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$new = $this->parse($v, $patterns[count($result)]); |
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return $new === false ? false : array_merge($result, [$new]); |
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}, []); |
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} |
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protected function _parseCons($value, $pattern) |
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{ |
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$patterns = split_enclosed(':', '(', ')', substr($pattern, 1, -1)); |
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if($patterns === false) { |
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$this->_invalidPattern($pattern); |
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} |
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if(! is_array($value)) { |
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return false; |
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} |
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$last = array_pop($patterns); |
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$results = array_reduce($patterns, function($acc, $p) { |
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if($acc === false || count($acc[1]) === 0) { |
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return false; |
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} |
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$new = $this->parse(array_shift($acc[1]), $p); |
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return $new === false ? false : [array_merge($acc[0], $new), $acc[1]]; |
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}, [[], $value]); |
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$new = $this->parse($value, $last); |
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return $new === false ? false : array_merge($results[0], $new); |
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} |
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protected function _parseAs($value, $pattern) |
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{ |
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$patterns = explode('@', $pattern, 2); |
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$rest = $this->parse($value, $patterns[1]); |
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return $rest === false ? false : array_merge([$patterns[0] => $value], $rest); |
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} |
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/** |
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* @param mixed $value |
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* @param string $pattern |
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* @return bool|array |
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*/ |
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public function parse($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 == $value ? [] : false; |
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} |
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$result = array_reduce(array_keys($this->rules), function($result, $regex) use($value, $pattern) { |
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if(preg_match($regex, $pattern)) { |
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$arguments = call_user_func_array([$this, $this->rules[$regex]], [$value, $pattern]); |
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return $arguments !== false ? $arguments : true; |
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} |
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return $result; |
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}, false); |
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if(! $result) { |
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$this->_invalidPattern($pattern); |
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} |
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return false; |
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} |
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protected function _invalidPattern($pattern) |
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{ |
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throw new \RuntimeException(sprintf('Invalid pattern "%s".', $pattern)); |
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} |
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} |
functional-php /
pattern-matching
