madlisp/src/Printer.php

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<?php
namespace MadLisp;
class Printer
{
public function print($ast, bool $readable = true): void
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{
print($this->doPrint($ast, $readable));
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}
private function doPrint($a, bool $readable): string
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{
if ($a instanceof Func) {
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return '<function>';
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} elseif ($a instanceof MList) {
return '(' . implode(' ', array_map(fn ($b) => $this->doPrint($b, $readable), $a->getData())) . ')';
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} elseif ($a instanceof Vector) {
return '[' . implode(' ', array_map(fn ($b) => $this->doPrint($b, $readable), $a->getData())) . ']';
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} elseif ($a instanceof Hash) {
return '{' . implode(' ', array_map(fn ($key, $val) => $this->doPrint($key, $readable) . ':' . $this->doPrint($val, $readable),
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array_keys($a->getData()), array_values($a->getData()))) . '}';
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} elseif ($a instanceof Symbol) {
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return $a->getName();
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} elseif ($a === true) {
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return 'true';
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} elseif ($a === false) {
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return 'false';
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} elseif ($a === null) {
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return 'null';
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} elseif (is_string($a)) {
if ($readable) {
$a = str_replace("\\", "\\\\", $a);
$a = str_replace("\n", "\\n", $a);
$a = str_replace("\r", "\\r", $a);
$a = str_replace("\"", "\\\"", $a);
return '"' . $a . '"';
} else {
return $a;
}
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} else {
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return $a;
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}
}
}