mirror of
https://github.com/kanaka/mal.git
synced 2024-10-26 22:28:26 +03:00
8a19f60386
- Reorder README to have implementation list after "learning tool" bullet. - This also moves tests/ and libs/ into impls. It would be preferrable to have these directories at the top level. However, this causes difficulties with the wasm implementations which need pre-open directories and have trouble with paths starting with "../../". So in lieu of that, symlink those directories to the top-level. - Move the run_argv_test.sh script into the tests directory for general hygiene.
222 lines
8.3 KiB
Vala
222 lines
8.3 KiB
Vala
class Mal.Main: GLib.Object {
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static bool eof;
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static construct {
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eof = false;
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}
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public static Mal.Val? READ() {
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string? line = Readline.readline("user> ");
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if (line != null) {
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if (line.length > 0)
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Readline.History.add(line);
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try {
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return Reader.read_str(line);
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} catch (Mal.Error err) {
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GLib.stderr.printf("%s\n", err.message);
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return null;
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}
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} else {
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stdout.printf("\n");
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eof = true;
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return null;
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}
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}
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public static Mal.Val eval_ast(Mal.Val ast, Mal.Env env)
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throws Mal.Error {
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var roota = new GC.Root(ast); (void)roota;
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var roote = new GC.Root(env); (void)roote;
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if (ast is Mal.Sym)
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return env.get(ast as Mal.Sym);
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if (ast is Mal.List) {
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var result = new Mal.List.empty();
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var root = new GC.Root(result); (void)root;
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foreach (var elt in (ast as Mal.List).vs)
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result.vs.append(EVAL(elt, env));
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return result;
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}
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if (ast is Mal.Vector) {
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var vec = ast as Mal.Vector;
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var result = new Mal.Vector.with_size(vec.length);
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var root = new GC.Root(result); (void)root;
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for (var i = 0; i < vec.length; i++)
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result[i] = EVAL(vec[i], env);
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return result;
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}
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if (ast is Mal.Hashmap) {
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var result = new Mal.Hashmap();
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var root = new GC.Root(result); (void)root;
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var map = (ast as Mal.Hashmap).vs;
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foreach (var key in map.get_keys())
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result.insert(key, EVAL(map[key], env));
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return result;
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}
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return ast;
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}
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private static Mal.Val define_eval(Mal.Val key, Mal.Val value,
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Mal.Env env)
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throws Mal.Error {
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var rootk = new GC.Root(key); (void)rootk;
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var roote = new GC.Root(env); (void)roote;
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var symkey = key as Mal.Sym;
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if (symkey == null)
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throw new Mal.Error.BAD_PARAMS(
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"let*: expected a symbol to define");
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var val = EVAL(value, env);
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env.set(symkey, val);
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return val;
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}
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public static Mal.Val EVAL(Mal.Val ast, Mal.Env env)
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throws Mal.Error {
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var ast_root = new GC.Root(ast); (void)ast_root;
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var env_root = new GC.Root(env); (void)env_root;
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GC.Core.maybe_collect();
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if (ast is Mal.List) {
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unowned GLib.List<Mal.Val> list = (ast as Mal.List).vs;
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if (list.first() == null)
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return ast;
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var first = list.first().data;
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if (first is Mal.Sym) {
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var sym = first as Mal.Sym;
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switch (sym.v) {
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case "def!":
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if (list.length() != 3)
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throw new Mal.Error.BAD_PARAMS(
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"def!: expected two values");
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return define_eval(list.next.data, list.next.next.data,
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env);
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case "let*":
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if (list.length() != 3)
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throw new Mal.Error.BAD_PARAMS(
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"let*: expected two values");
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var defns = list.nth(1).data;
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var newenv = new Mal.Env.within(env);
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if (defns is Mal.List) {
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for (unowned GLib.List<Mal.Val> iter =
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(defns as Mal.List).vs;
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iter != null; iter = iter.next.next) {
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if (iter.next == null)
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throw new Mal.Error.BAD_PARAMS(
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"let*: expected an even-length list" +
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" of definitions");
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define_eval(iter.data, iter.next.data, newenv);
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}
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} else if (defns is Mal.Vector) {
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var vec = defns as Mal.Vector;
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if (vec.length % 2 != 0)
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throw new Mal.Error.BAD_PARAMS(
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"let*: expected an even-length vector" +
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" of definitions");
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for (var i = 0; i < vec.length; i += 2)
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define_eval(vec[i], vec[i+1], newenv);
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} else {
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throw new Mal.Error.BAD_PARAMS(
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"let*: expected a list or vector of definitions");
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}
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return EVAL(list.nth(2).data, newenv);
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case "do":
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Mal.Val result = null;
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for (list = list.next; list != null; list = list.next)
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result = EVAL(list.data, env);
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if (result == null)
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throw new Mal.Error.BAD_PARAMS(
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"do: expected at least one argument");
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return result;
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case "if":
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if (list.length() != 3 && list.length() != 4)
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throw new Mal.Error.BAD_PARAMS(
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"if: expected two or three arguments");
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list = list.next;
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var cond = EVAL(list.data, env);
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list = list.next;
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if (!cond.truth_value()) {
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// Skip to the else clause, which defaults to nil.
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list = list.next;
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if (list == null)
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return new Mal.Nil();
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}
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return EVAL(list.data, env);
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case "fn*":
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if (list.length() != 3)
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throw new Mal.Error.BAD_PARAMS(
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"fn*: expected two arguments");
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var binds = list.next.data as Mal.Listlike;
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var body = list.next.next.data;
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if (binds == null)
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throw new Mal.Error.BAD_PARAMS(
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"fn*: expected a list of parameter names");
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for (var iter = binds.iter(); iter.nonempty(); iter.step())
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if (!(iter.deref() is Mal.Sym))
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throw new Mal.Error.BAD_PARAMS(
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"fn*: expected parameter name to be "+
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"symbol");
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return new Mal.Function(binds, body, env);
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}
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}
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var newlist = eval_ast(ast, env) as Mal.List;
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unowned GLib.List<Mal.Val> firstlink = newlist.vs.first();
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Mal.Val firstdata = firstlink.data;
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newlist.vs.remove_link(firstlink);
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if (firstdata is Mal.BuiltinFunction) {
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return (firstdata as Mal.BuiltinFunction).call(newlist);
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} else if (firstdata is Mal.Function) {
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var fn = firstdata as Mal.Function;
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var newenv = new Mal.Env.funcall(
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fn.env, fn.parameters, newlist);
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return EVAL(fn.body, newenv);
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} else {
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throw new Mal.Error.CANNOT_APPLY(
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"bad value at start of list");
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}
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} else {
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return eval_ast(ast, env);
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}
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}
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public static void PRINT(Mal.Val value) {
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stdout.printf("%s\n", pr_str(value));
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}
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public static void rep(Mal.Env env) throws Mal.Error {
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Mal.Val? val = READ();
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if (val != null) {
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val = EVAL(val, env);
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PRINT(val);
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}
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}
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public static int main(string[] args) {
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var env = new Mal.Env();
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var root = new GC.Root(env); (void)root;
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Mal.Core.make_ns();
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foreach (var key in Mal.Core.ns.get_keys())
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env.set(new Mal.Sym(key), Mal.Core.ns[key]);
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try {
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EVAL(Mal.Reader.read_str("(def! not (fn* (a) (if a false true)))"),
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env);
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} catch (Mal.Error err) {
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assert(false); // shouldn't happen
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}
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while (!eof) {
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try {
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rep(env);
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} catch (Mal.Error err) {
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GLib.stderr.printf("%s\n", err.message);
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}
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}
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return 0;
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}
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}
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