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<?php |
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namespace Sphpeme\Env; |
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class StdEnv implements EnvInterface |
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{ |
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const MAPPING = [ |
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'#' => '+', |
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'+' => 'add', |
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'-' => 'subtract', |
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'*' => 'multiply', |
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'/' => 'divide', |
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'>' => 'gt', |
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'<' => 'lt', |
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'<=' => 'lte', |
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'>=' => 'gte', |
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'eq?' => 'isEqual', |
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'eqv?' => 'isEquiv', |
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'list' => '_list' |
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]; |
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public function __isset($prop): bool |
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{ |
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return (bool)$this->__get($prop); |
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} |
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public function __get(string $prop) |
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{ |
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if (isset(static::MAPPING[$prop])) { |
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return $this->__get(static::MAPPING[$prop]); |
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} |
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return \is_callable([$this, $prop]) |
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? [$this, $prop] |
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: $this->$prop; |
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} |
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public $pi = M_PI; |
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public function _list(...$args) |
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{ |
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return $args; |
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} |
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public function car(array $list) |
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{ |
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return current($list); |
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} |
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public function cdr(array $list) |
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{ |
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return \array_slice($list, 1); |
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} |
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public function display($arg) |
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{ |
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if (is_scalar($arg) || method_exists($arg, '__toString')) { |
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echo $arg; |
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} else { |
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var_export($arg); |
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} |
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} |
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public function newline() |
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{ |
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echo PHP_EOL; |
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} |
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public function add($first, ...$rest) |
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{ |
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return $first + (\count($rest) > 1 |
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? $this->add(...$rest) |
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: current($rest)); |
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} |
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public function subtract($first, ...$rest) |
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{ |
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return $first - (\count($rest) > 1 |
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? $this->add(...$rest) |
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: current($rest)); |
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} |
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public function multiply($first, ...$rest) |
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{ |
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return $first * (\count($rest) > 1 |
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? $this->multiply(...$rest) |
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: current($rest)); |
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} |
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public function divide($a, $b) |
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{ |
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return $a / $b; |
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} |
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public function gt($a, $b) |
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{ |
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return $a > $b; |
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} |
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public function lt($a, $b) |
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{ |
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return $a < $b; |
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} |
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public function gte($a, $b) |
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{ |
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return $a >= $b; |
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} |
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public function lte($a, $b) |
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{ |
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return $a <= $b; |
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} |
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public function isEqual($a, $b) |
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{ |
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return $a == $b; |
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} |
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public function isEquiv($a, $b) |
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{ |
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return $a === $b; |
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} |
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} |
mattwellss /
sphpeme
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