2016-11-14 01:21:44 +03:00
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import 'dart:io';
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import 'core.dart';
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import 'env.dart';
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import 'printer.dart' as printer;
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import 'reader.dart' as reader;
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import 'types.dart';
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final Env replEnv = new Env();
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void setupEnv(List<String> argv) {
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ns.forEach((sym, fun) => replEnv.set(sym, fun));
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2022-01-10 02:15:40 +03:00
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replEnv.set('eval',
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2016-11-14 01:21:44 +03:00
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new MalBuiltin((List<MalType> args) => EVAL(args.single, replEnv)));
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2022-01-10 02:15:40 +03:00
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replEnv.set('*ARGV*',
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2016-11-14 01:21:44 +03:00
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new MalList(argv.map((s) => new MalString(s)).toList()));
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rep('(def! not (fn* (a) (if a false true)))');
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rep("(def! load-file "
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2019-07-16 00:57:02 +03:00
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" (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))");
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2016-11-14 01:21:44 +03:00
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rep("(defmacro! cond "
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" (fn* (& xs) (if (> (count xs) 0) "
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" (list 'if (first xs) "
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" (if (> (count xs) 1) "
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" (nth xs 1) "
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" (throw \"odd number of forms to cond\")) "
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" (cons 'cond (rest (rest xs)))))))");
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}
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2020-07-21 19:01:48 +03:00
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bool starts_with(MalType ast, String sym) {
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return ast is MalList && ast.length == 2 && ast.first == new MalSymbol(sym);
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}
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MalType qq_loop(List<MalType> xs) {
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var acc = new MalList([]);
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for (var i=xs.length-1; 0<=i; i-=1) {
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if (starts_with(xs[i], "splice-unquote")) {
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acc = new MalList([new MalSymbol("concat"), (xs[i] as MalList)[1], acc]);
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} else {
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acc = new MalList([new MalSymbol("cons"), quasiquote(xs[i]), acc]);
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}
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2016-11-14 01:21:44 +03:00
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}
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2020-07-21 19:01:48 +03:00
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return acc;
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}
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2016-11-14 01:21:44 +03:00
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2020-07-21 19:01:48 +03:00
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MalType quasiquote(MalType ast) {
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if (starts_with(ast, "unquote")) {
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return (ast as MalList).elements[1];
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} else if (ast is MalList) {
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return qq_loop(ast.elements);
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} else if (ast is MalVector) {
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return new MalList([new MalSymbol("vec"), qq_loop(ast.elements)]);
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} else if (ast is MalSymbol || ast is MalHashMap) {
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2016-11-14 01:21:44 +03:00
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return new MalList([new MalSymbol("quote"), ast]);
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} else {
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2020-07-21 19:01:48 +03:00
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return ast;
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2016-11-14 01:21:44 +03:00
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}
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}
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MalType READ(String x) => reader.read_str(x);
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2022-01-10 02:15:40 +03:00
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MalType EVAL(MalType ast, Env env) {
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while (true) {
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var dbgeval = env.get("DEBUG-EVAL");
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if (dbgeval != null && !(dbgeval is MalNil)
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&& !(dbgeval is MalBool && dbgeval.value == false)) {
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stdout.writeln("EVAL: ${printer.pr_str(ast)}");
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}
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2016-11-14 01:21:44 +03:00
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if (ast is MalSymbol) {
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2022-01-10 02:15:40 +03:00
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var result = env.get(ast.value);
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if (result == null) {
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throw new NotFoundException(ast.value);
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}
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return result;
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2016-11-14 01:21:44 +03:00
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} else if (ast is MalList) {
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2022-01-10 02:15:40 +03:00
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// Exit this switch.
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2016-11-14 01:21:44 +03:00
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} else if (ast is MalVector) {
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return new MalVector(ast.elements.map((x) => EVAL(x, env)).toList());
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} else if (ast is MalHashMap) {
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var newMap = new Map<MalType, MalType>.from(ast.value);
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for (var key in newMap.keys) {
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newMap[key] = EVAL(newMap[key], env);
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}
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return new MalHashMap(newMap);
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} else {
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return ast;
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}
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2022-01-10 02:15:40 +03:00
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// ast is a list. todo: indent left.
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2016-11-14 01:21:44 +03:00
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if ((ast as MalList).isEmpty) return ast;
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var list = ast as MalList;
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if (list.elements.first is MalSymbol) {
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var symbol = list.elements.first as MalSymbol;
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var args = list.elements.sublist(1);
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if (symbol.value == "def!") {
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MalSymbol key = args.first;
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MalType value = EVAL(args[1], env);
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2022-01-10 02:15:40 +03:00
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env.set(key.value, value);
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2016-11-14 01:21:44 +03:00
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return value;
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} else if (symbol.value == "defmacro!") {
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MalSymbol key = args.first;
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2022-01-10 02:15:40 +03:00
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MalClosure macro = (EVAL(args[1], env) as MalClosure).clone();
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2016-11-14 01:21:44 +03:00
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macro.isMacro = true;
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2022-01-10 02:15:40 +03:00
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env.set(key.value, macro);
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2016-11-14 01:21:44 +03:00
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return macro;
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} else if (symbol.value == "let*") {
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// TODO(het): If elements.length is not even, give helpful error
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Iterable<List<MalType>> pairs(List<MalType> elements) sync* {
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for (var i = 0; i < elements.length; i += 2) {
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yield [elements[i], elements[i + 1]];
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}
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}
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var newEnv = new Env(env);
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MalIterable bindings = args.first;
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for (var pair in pairs(bindings.elements)) {
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MalSymbol key = pair[0];
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MalType value = EVAL(pair[1], newEnv);
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2022-01-10 02:15:40 +03:00
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newEnv.set(key.value, value);
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2016-11-14 01:21:44 +03:00
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}
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ast = args[1];
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env = newEnv;
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continue;
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} else if (symbol.value == "do") {
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2022-01-10 02:15:40 +03:00
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for (var elt in args.sublist(0, args.length - 1)) {
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EVAL(elt, env);
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}
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2016-11-14 01:21:44 +03:00
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ast = args.last;
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continue;
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} else if (symbol.value == "if") {
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var condition = EVAL(args[0], env);
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if (condition is MalNil ||
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condition is MalBool && condition.value == false) {
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// False side of branch
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if (args.length < 3) {
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return new MalNil();
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}
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ast = args[2];
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continue;
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} else {
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// True side of branch
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ast = args[1];
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continue;
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}
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} else if (symbol.value == "fn*") {
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var params = (args[0] as MalIterable)
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.elements
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.map((e) => e as MalSymbol)
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.toList();
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return new MalClosure(
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params,
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args[1],
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env,
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(List<MalType> funcArgs) =>
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EVAL(args[1], new Env(env, params, funcArgs)));
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} else if (symbol.value == "quote") {
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return args.single;
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} else if (symbol.value == "quasiquote") {
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ast = quasiquote(args.first);
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continue;
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}
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}
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2022-01-10 02:15:40 +03:00
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var f = EVAL(list.elements.first, env);
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if (f is MalCallable && f.isMacro) {
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ast = f.call(list.elements.sublist(1));
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continue;
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}
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var args = list.elements.sublist(1).map((x) => EVAL(x, env)).toList();
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2016-11-14 01:21:44 +03:00
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if (f is MalBuiltin) {
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return f.call(args);
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} else if (f is MalClosure) {
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ast = f.ast;
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env = new Env(f.env, f.params, args);
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continue;
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} else {
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throw 'bad!';
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}
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}
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}
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String PRINT(MalType x) => printer.pr_str(x);
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String rep(String x) {
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Test uncaught throw, catchless try* . Fix 46 impls.
Fixes made to: ada, c, chuck, clojure, coffee, common-lisp, cpp,
crystal, d, dart, elm, erlang, es6, factor, fsharp, gnu-smalltalk,
groovy, guile, haxe, hy, js, livescript, matlab, miniMAL, nasm, nim,
objc, objpascal, ocaml, perl, perl6, php, plsql, ps, python, r,
rpython, ruby, scheme, swift3, tcl, ts, vb, vimscript, wasm, yorick.
Catchless try* test is an optional test. Not all implementations
support catchless try* but a number were fixed so they at least don't
crash on catchless try*.
2018-12-03 22:20:44 +03:00
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return PRINT(EVAL(READ(x), replEnv));
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2016-11-14 01:21:44 +03:00
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}
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const prompt = 'user> ';
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main(List<String> args) {
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setupEnv(args.isEmpty ? const <String>[] : args.sublist(1));
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if (args.isNotEmpty) {
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rep("(load-file \"${args.first}\")");
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return;
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}
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while (true) {
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stdout.write(prompt);
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var input = stdin.readLineSync();
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if (input == null) return;
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var output;
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try {
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output = rep(input);
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Test uncaught throw, catchless try* . Fix 46 impls.
Fixes made to: ada, c, chuck, clojure, coffee, common-lisp, cpp,
crystal, d, dart, elm, erlang, es6, factor, fsharp, gnu-smalltalk,
groovy, guile, haxe, hy, js, livescript, matlab, miniMAL, nasm, nim,
objc, objpascal, ocaml, perl, perl6, php, plsql, ps, python, r,
rpython, ruby, scheme, swift3, tcl, ts, vb, vimscript, wasm, yorick.
Catchless try* test is an optional test. Not all implementations
support catchless try* but a number were fixed so they at least don't
crash on catchless try*.
2018-12-03 22:20:44 +03:00
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} on reader.ParseException catch (e) {
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stdout.writeln("Error: '${e.message}'");
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continue;
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} on NotFoundException catch (e) {
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stdout.writeln("Error: '${e.value}' not found");
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continue;
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} on MalException catch (e) {
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stdout.writeln("Error: ${printer.pr_str(e.value)}");
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continue;
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2016-11-14 01:21:44 +03:00
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} on reader.NoInputException {
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continue;
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}
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stdout.writeln(output);
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}
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}
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