mirror of
https://github.com/kanaka/mal.git
synced 2024-09-21 10:37:58 +03:00
113 lines
2.9 KiB
PHP
113 lines
2.9 KiB
PHP
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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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// 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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function eval_ast($ast, $env) {
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if (symbol_Q($ast)) {
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return $env->get($ast->value);
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} elseif (list_Q($ast) || vector_Q($ast)) {
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if (list_Q($ast)) {
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$el = new_list();
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} else {
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$el = new_vector();
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}
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foreach ($ast as $a) { $el[] = MAL_EVAL($a, $env); }
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return $el;
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} elseif (hash_map_Q($ast)) {
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$new_hm = new_hash_map();
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foreach (array_keys($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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} else {
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return $ast;
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}
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}
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function MAL_EVAL($ast, $env) {
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#echo "MAL_EVAL: " . _pr_str($ast) . "\n";
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if (!list_Q($ast)) {
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return eval_ast($ast, $env);
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}
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// apply list
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$a0 = $ast[0];
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$a0v = (symbol_Q($a0) ? $a0->value : $a0);
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switch ($a0v) {
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case "def!":
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$res = MAL_EVAL($ast[2], $env);
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return $env->set($ast[1]->value, $res);
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case "let*":
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$a1 = $ast[1];
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$let_env = new Env($env);
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for ($i=0; $i < count($a1); $i+=2) {
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$let_env->set($a1[$i]->value, MAL_EVAL($a1[$i+1], $let_env));
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}
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return MAL_EVAL($ast[2], $let_env);
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case "do":
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#$el = eval_ast(array_slice($ast->getArrayCopy(), 1), $env);
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$el = eval_ast($ast->slice(1), $env);
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return $el[count($el)-1];
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case "if":
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$cond = MAL_EVAL($ast[1], $env);
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if ($cond === NULL || $cond === false) {
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if (count($ast) === 4) { return MAL_EVAL($ast[3], $env); }
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else { return NULL; }
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} else {
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return MAL_EVAL($ast[2], $env);
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}
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case "fn*":
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return function() use ($env, $ast) {
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$fn_env = new Env($env, $ast[1], func_get_args());
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return MAL_EVAL($ast[2], $fn_env);
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};
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default:
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$el = eval_ast($ast, $env);
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$f = $el[0];
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return call_user_func_array($f, array_slice($el->getArrayCopy(), 1));
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}
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}
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// print
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function MAL_PRINT($exp) {
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return _pr_str($exp, True) . "\n";
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}
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// repl
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$repl_env = new Env(NULL);
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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), $repl_env));
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}
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function _ref($k, $v) { global $repl_env; $repl_env->set($k, $v); }
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// Import types functions
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foreach ($types_ns as $k=>$v) { _ref($k, $v); }
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// Defined using the language itself
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rep("(def! not (fn* (a) (if a false true)))");
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do {
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try {
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$line = mal_readline("user> ");
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if ($line === NULL) { break; }
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if ($line !== "") {
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print(rep($line));
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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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?>
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