All: rename stepA_interop to stepA_mal

Also, add missed postscript interop tests.

1 files changed, 229 insertions, 0 deletions

diff --git a/php/stepA_mal.php b/php/stepA_mal.php
new file mode 100644
index 0000000..1dc3b04
--- /dev/null
+++ b/php/stepA_mal.php
@@ -0,0 +1,229 @@
+<?php
+
+require_once 'readline.php';
+require_once 'types.php';
+require_once 'reader.php';
+require_once 'printer.php';
+require_once 'env.php';
+require_once 'core.php';
+
+// read
+function READ($str) {
+    return read_str($str);
+}
+
+// eval
+function is_pair($x) {
+    return _sequential_Q($x) and count($x) > 0;
+}
+
+function quasiquote($ast) {
+    if (!is_pair($ast)) {
+        return _list(_symbol("quote"), $ast);
+    } elseif (_symbol_Q($ast[0]) && $ast[0]->value === 'unquote') {
+        return $ast[1];
+    } elseif (is_pair($ast[0]) && _symbol_Q($ast[0][0]) &&
+              $ast[0][0]->value === 'splice-unquote') {
+        return _list(_symbol("concat"), $ast[0][1],
+                     quasiquote($ast->slice(1)));
+    } else {
+        return _list(_symbol("cons"), quasiquote($ast[0]),
+                     quasiquote($ast->slice(1)));
+    }
+}
+
+function is_macro_call($ast, $env) {
+    return is_pair($ast) &&
+           _symbol_Q($ast[0]) &&
+           $env->find($ast[0]) &&
+           $env->get($ast[0])->ismacro;
+}
+
+function macroexpand($ast, $env) {
+    while (is_macro_call($ast, $env)) {
+        $mac = $env->get($ast[0]);
+        $args = array_slice($ast->getArrayCopy(),1);
+        $ast = $mac->apply($args);
+    }
+    return $ast;
+}
+
+function eval_ast($ast, $env) {
+    if (_symbol_Q($ast)) {
+        return $env->get($ast);
+    } elseif (_sequential_Q($ast)) {
+        if (_list_Q($ast)) {
+            $el = _list();
+        } else {
+            $el = _vector();
+        }
+        foreach ($ast as $a) { $el[] = MAL_EVAL($a, $env); }
+        return $el;
+    } elseif (_hash_map_Q($ast)) {
+        $new_hm = _hash_map();
+        foreach (array_keys($ast->getArrayCopy()) as $key) {
+            $new_hm[$key] = MAL_EVAL($ast[$key], $env);
+        }
+        return $new_hm;
+    } else {
+        return $ast;
+    }
+}
+
+function MAL_EVAL($ast, $env) {
+    while (true) {
+
+    #echo "MAL_EVAL: " . _pr_str($ast) . "\n";
+    if (!_list_Q($ast)) {
+        return eval_ast($ast, $env);
+    }
+
+    // apply list
+    $ast = macroexpand($ast, $env);
+    if (!_list_Q($ast)) { return $ast; }
+
+    $a0 = $ast[0];
+    $a0v = (_symbol_Q($a0) ? $a0->value : $a0);
+    switch ($a0v) {
+    case "def!":
+        $res = MAL_EVAL($ast[2], $env);
+        return $env->set($ast[1], $res);
+    case "let*":
+        $a1 = $ast[1];
+        $let_env = new Env($env);
+        for ($i=0; $i < count($a1); $i+=2) {
+            $let_env->set($a1[$i], MAL_EVAL($a1[$i+1], $let_env));
+        }
+        $ast = $ast[2];
+        $env = $let_env;
+        break; // Continue loop (TCO)
+    case "quote":
+        return $ast[1];
+    case "quasiquote":
+        $ast = quasiquote($ast[1]);
+        break; // Continue loop (TCO)
+    case "defmacro!":
+        $func = MAL_EVAL($ast[2], $env);
+        $func->ismacro = true;
+        return $env->set($ast[1], $func);
+    case "macroexpand":
+        return macroexpand($ast[1], $env);
+    case "php*":
+        $res = eval($ast[1]);
+        switch (gettype($res)) {
+        case "array":
+            if ($res !== array_values($res)) {
+                $new_res = _hash_map();
+                $new_res->exchangeArray($res);
+                return $new_res;
+            } else {
+                return call_user_func_array('_list', $res);
+            }
+        default:
+            return $res;
+        }
+    case "try*":
+        $a1 = $ast[1];
+        $a2 = $ast[2];
+        if ($a2[0]->value === "catch*") {
+            try {
+                return MAL_EVAL($a1, $env);
+            } catch (Error $e) {
+                $catch_env = new Env($env, array($a2[1]),
+                                            array($e->obj));
+                return MAL_EVAL($a2[2], $catch_env);
+            } catch (Exception $e) {
+                $catch_env = new Env($env, array($a2[1]),
+                                            array($e->getMessage()));
+                return MAL_EVAL($a2[2], $catch_env);
+            }
+        } else {
+            return MAL_EVAL($a1, $env);
+        }
+    case "do":
+        eval_ast($ast->slice(1, -1), $env);
+        $ast = $ast[count($ast)-1];
+        break; // Continue loop (TCO)
+    case "if":
+        $cond = MAL_EVAL($ast[1], $env);
+        if ($cond === NULL || $cond === false) {
+            if (count($ast) === 4) { $ast = $ast[3]; }
+            else                   { $ast = NULL; }
+        } else {
+            $ast = $ast[2];
+        }
+        break; // Continue loop (TCO)
+    case "fn*":
+        return _function('MAL_EVAL', 'native',
+                         $ast[2], $env, $ast[1]);
+    default:
+        $el = eval_ast($ast, $env);
+        $f = $el[0];
+        $args = array_slice($el->getArrayCopy(), 1);
+        if ($f->type === 'native') {
+            $ast = $f->ast;
+            $env = $f->gen_env($args);
+            // Continue loop (TCO)
+        } else {
+            return $f->apply($args);
+        }
+    }
+
+    }
+}
+
+// print
+function MAL_PRINT($exp) {
+    return _pr_str($exp, True) . "\n";
+}
+
+// repl
+$repl_env = new Env(NULL);
+function rep($str) {
+    global $repl_env;
+    return MAL_PRINT(MAL_EVAL(READ($str), $repl_env));
+}
+
+// core.php: defined using PHP
+foreach ($core_ns as $k=>$v) {
+    $repl_env->set(_symbol($k), _function($v));
+}
+$repl_env->set(_symbol('eval'), _function(function($ast) {
+    global $repl_env; return MAL_EVAL($ast, $repl_env);
+}));
+$_argv = _list();
+for ($i=2; $i < count($argv); $i++) {
+    $_argv->append($argv[$i]);
+}
+$repl_env->set(_symbol('*ARGV*'), $_argv);
+
+// core.mal: defined using the language itself
+rep("(def! *host-language* \"php\")");
+rep("(def! not (fn* (a) (if a false true)))");
+rep("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))");
+rep("(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))");
+rep("(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))");
+
+if (count($argv) > 1) {
+    rep('(load-file "' . $argv[1] . '")');
+    exit(0);
+}
+
+// repl loop
+rep("(println (str \"Mal [\" *host-language* \"]\"))");
+do {
+    try {
+        $line = mal_readline("user> ");
+        if ($line === NULL) { break; }
+        if ($line !== "") {
+            print(rep($line));
+        }
+    } catch (BlankException $e) {
+        continue;
+    } catch (Exception $e) {
+        echo "Error: " . $e->getMessage() . "\n";
+        echo $e->getTraceAsString() . "\n";
+    }
+} while (true);
+
+?>