2014-03-24 16:32:24 -05:00
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<?php
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require_once 'readline.php';
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require_once 'types.php';
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require_once 'reader.php';
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2014-04-02 22:23:37 -05:00
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require_once 'printer.php';
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2014-03-24 16:32:24 -05:00
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// read
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function READ($str) {
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return read_str($str);
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}
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// eval
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2022-01-10 00:15:40 +01:00
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function MAL_EVAL($ast, $env) {
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// echo "EVAL: " . _pr_str($ast) . "\n";
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2014-04-02 22:23:37 -05:00
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if (_symbol_Q($ast)) {
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2014-03-24 16:32:24 -05:00
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return $env[$ast->value];
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2022-01-10 00:15:40 +01:00
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} elseif (_vector_Q($ast)) {
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2014-04-02 22:23:37 -05:00
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$el = _vector();
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2014-03-24 16:32:24 -05:00
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foreach ($ast as $a) { $el[] = MAL_EVAL($a, $env); }
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return $el;
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2014-04-02 22:23:37 -05:00
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} elseif (_hash_map_Q($ast)) {
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$new_hm = _hash_map();
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2014-03-24 16:32:24 -05:00
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foreach (array_keys($ast->getArrayCopy()) as $key) {
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$new_hm[$key] = MAL_EVAL($ast[$key], $env);
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}
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return $new_hm;
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2022-01-10 00:15:40 +01:00
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} elseif (!_list_Q($ast)) {
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2014-03-24 16:32:24 -05:00
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return $ast;
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}
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2016-04-02 17:56:04 -05:00
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if ($ast->count() === 0) {
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return $ast;
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}
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2014-03-24 16:32:24 -05:00
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// apply list
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2022-01-10 00:15:40 +01:00
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$el = [];
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foreach ($ast as $a) { $el[] = MAL_EVAL($a, $env); }
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2014-03-24 16:32:24 -05:00
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$f = $el[0];
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2022-01-10 00:15:40 +01:00
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$args = array_slice($el, 1);
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return call_user_func_array($f, $args);
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2014-03-24 16:32:24 -05:00
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}
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// print
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function MAL_PRINT($exp) {
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2015-03-07 09:04:07 -06:00
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return _pr_str($exp, True);
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2014-03-24 16:32:24 -05:00
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}
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// repl
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$repl_env = array();
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function rep($str) {
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global $repl_env;
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return MAL_PRINT(MAL_EVAL(READ($str), $repl_env));
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}
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2014-04-16 23:57:50 -05:00
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2014-03-24 16:32:24 -05:00
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$repl_env['+'] = function ($a, $b) { return intval($a + $b,10); };
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$repl_env['-'] = function ($a, $b) { return intval($a - $b,10); };
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$repl_env['*'] = function ($a, $b) { return intval($a * $b,10); };
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$repl_env['/'] = function ($a, $b) { return intval($a / $b,10); };
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2014-04-19 13:04:09 -05:00
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// repl loop
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2014-03-24 16:32:24 -05:00
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do {
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try {
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$line = mal_readline("user> ");
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if ($line === NULL) { break; }
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if ($line !== "") {
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2015-03-07 09:04:07 -06:00
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print(rep($line) . "\n");
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2014-03-24 16:32:24 -05:00
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}
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} catch (BlankException $e) {
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continue;
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} catch (Exception $e) {
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echo "Error: " . $e->getMessage() . "\n";
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echo $e->getTraceAsString() . "\n";
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}
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} while (true);
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2014-04-19 13:04:09 -05:00
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?>
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