321 lines
8.1 KiB
HTML
321 lines
8.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>NCD in Javascript</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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</head>
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<body>
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<script src="emncd.js"></script>
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<script>
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var cfunc_emncd_start = Module.cwrap('emncd_start', 'null', ['string']);
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var cfunc_emncd_stop = Module.cwrap('emncd_stop', 'null', []);
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function on_start ()
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{
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var code = document.getElementById('codetext').value;
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var loglevel = 0;
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for (i = 0; i <= 5; i++) {
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if (document.getElementById('loglevel' + i).checked) {
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loglevel = i;
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}
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}
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cfunc_emncd_start(code, loglevel);
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}
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function on_stop ()
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{
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cfunc_emncd_stop();
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}
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function load_example (num)
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{
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document.getElementById('codetext').value = document.getElementById('example' + num).value;
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}
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</script>
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This is a quick port of my <a href="http://code.google.com/p/badvpn/wiki/NCD">NCD programming language</a>
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to Javascript using the <a href="https://github.com/kripken/emscripten">Emscripten</a> compiler.
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<br />
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Please open the Javascript console so you can see the output (Chrome: CTRL+Shift+J. Firefox: CTRL+Shift+K).
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<br />
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<textarea id="example1" style="display:none;">
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process hello {
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println("hello, world");
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exit("0");
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}
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</textarea>
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<textarea id="example2" style="display:none;">
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process foo {
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println("Starting up, please wait...");
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rprintln("Goodbye World!");
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sleep("500", "300"); # sleeps 500ms on init and 300ms on deinit
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println("Hello World!");
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rprintln("Shutting down, please wait...");
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}
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</textarea>
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<textarea id="example3" style="display:none;">
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process hello {
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var("0") ctr;
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blocker() blk;
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blk->up();
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blk->use();
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num_modulo(ctr, "3") m_three;
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num_modulo(ctr, "5") m_five;
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num_equal(m_three, "0") d_three;
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num_equal(m_five, "0") d_five;
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and(d_three, d_five) d_three_five;
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If (d_three_five) {
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var("fizzbuzz") text;
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} Elif (d_three) {
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var("fizz") text;
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} Elif (d_five) {
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var("buzz") text;
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} else {
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var(ctr) text;
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} branch;
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println(branch.text);
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num_add(ctr, "1") i;
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num_modulo(i, "20") i;
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ctr->set(i);
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sleep("100", "0");
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blk->downup();
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}
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</textarea>
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<textarea id="example4" style="display:none;">
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process main {
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var({"0", "1", "3", "2", "2", "3", "1", "1", "6", "end"}) list;
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value(["1":"one", "2":"two", "3":"three"]) map;
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call("replace", {"_caller.list", "_caller.map"}) replace;
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to_string(replace.result) str;
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println(str);
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exit("0");
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}
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template replace {
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alias(_arg0) list;
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alias(_arg1) map;
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value({}) new_list;
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Foreach (list As elem) {
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map->try_get(elem) y;
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If (y.exists) {
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new_list->insert(new_list.length, y);
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} Else {
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new_list->insert(new_list.length, elem);
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};
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};
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alias("new_list") result;
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}
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</textarea>
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<textarea id="example5" style="display:none;">
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process hello {
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println("Hello, NCD in Javascript!");
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println("Will now wait 2 seconds.");
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rprintln("Goodbye.");
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sleep("2000", "3000");
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rprintln("Waiting 3 seconds before dying.");
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call("func", {"FirstArg", "SecondArg"});
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var({"one", "two", "three"}) list;
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to_string(list) str;
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println(str);
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Foreach (list As elem) {
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println("start ", elem);
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rprintln("stop ", elem);
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};
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println("We're finished. Press \"Request termination\" to unwind us.");
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rprintln("Terminating...");
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}
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template func {
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println("func here, my args are: ", _arg0, " ", _arg1);
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rprintln("func going away");
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}
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</textarea>
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<textarea id="example6" style="display:none;">
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process main {
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# Turing machine specification.
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var("B") blank;
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var([
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{"0", "0"}:{"0", "0", "right"},
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{"0", "1"}:{"1", "x", "right"},
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{"1", "1"}:{"1", "1", "right"},
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{"1", "0"}:{"2", "0", "right"},
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{"2", "0"}:{"2", "0", "right"},
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{"2", "1"}:{"3", "1", "right"},
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{"3", "1"}:{"3", "1", "right"},
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{"3", "0"}:{"4", "1", "left"},
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{"3", "B"}:{"4", "1", "left"},
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{"4", "1"}:{"4", "1", "left"},
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{"4", "0"}:{"5", "0", "left"},
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{"5", "0"}:{"5", "0", "left"},
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{"5", "1"}:{"6", "1", "left"},
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{"5", "x"}:{"h", "x", "stay"},
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{"6", "1"}:{"6", "1", "left"},
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{"6", "x"}:{"0", "x", "right"},
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{"6", "0"}:{"0", "0", "right"}
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]) rules;
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var("0") initial_state;
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var({}) initial_tape_left;
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var({
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"1", "1", "1", "1", "0", "0", "1", "1", "1", "1"
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}) initial_tape_right;
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# Perform the computation, stopping when no rule matches.
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call("turing", {blank, rules, initial_state, initial_tape_left, initial_tape_right}) results;
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# Print results.
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to_string(results.tape_left) tape_left;
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to_string(results.tape_right) tape_right;
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to_string({results.side, results.pos}) head_pos;
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to_string(results.state) head_state;
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println("Tape L: ", tape_left);
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println("Tape R: ", tape_right);
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println("Head position: ", head_pos);
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println("Head state: ", head_state);
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exit("0");
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}
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template turing {
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alias("_arg0") blank;
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value(_arg1) rules;
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alias("_arg2") initial_state;
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alias("_arg3") initial_tape_left;
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alias("_arg4") initial_tape_right;
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# Head state.
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var(initial_state) state;
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# Tape. Positions go like this: ... L2 L1 L0 R0 R1 R2 ...
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value(initial_tape_left) tape_left;
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value(initial_tape_right) tape_right;
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# Make sure each side of the tape has at least one symbol so we can flip easily.
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tape_left->insert(tape_left.length, blank);
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tape_right->insert(tape_right.length, blank);
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# Head position.
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var("right") side;
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var("0") pos;
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# Enter loop.
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blocker() loop_blk;
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loop_blk->up();
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loop_blk->use();
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# Get symbol under head.
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concat("tape_", side) tape_name;
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alias(tape_name) cur_tape;
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cur_tape->get(pos) symbol;
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# Look for a matching rule.
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rules->try_get({state, symbol}) rule;
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If (rule.exists) {
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# Extract directions from rule.
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rule->get("0") new_state;
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rule->get("1") new_symbol;
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rule->get("2") move;
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# Change head state.
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state->set(new_state);
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# Replace symbol under head.
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cur_tape->remove(pos);
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cur_tape->insert(pos, new_symbol);
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# Branch based on how we move.
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strcmp(move, side) is_outside;
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strcmp(move, "stay") is_stay;
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strcmp(pos, "0") is_zero;
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If (is_outside) {
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# Increment position.
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num_add(pos, "1") new_pos;
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pos->set(new_pos);
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# If the new position is out of range, extend tape.
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strcmp(pos, cur_tape.length) need_extend;
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If (need_extend) {
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cur_tape->insert(pos, blank);
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};
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} elif (is_stay) {
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# Nop.
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getargs();
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} elif (is_zero) {
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# Flip side, leave pos at zero.
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side->set(move);
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} else {
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# Decrement position.
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num_subtract(pos, "1") new_pos;
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pos->set(new_pos);
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};
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# Continue loop.
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loop_blk->downup();
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};
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}
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</textarea>
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Examples:
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<button onclick="load_example(1)">Hello World</button>
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<button onclick="load_example(2)">Sleep</button>
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<button onclick="load_example(3)">FizzBuzz</button>
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<button onclick="load_example(4)">Replace</button>
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<button onclick="load_example(5)">Foreach, call</button>
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<button onclick="load_example(6)">Turing Machine</button>
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<br />
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<textarea rows=30 cols=80 id="codetext">
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process hello {
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println("hello, world");
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exit("0");
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}
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</textarea>
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<br />
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Loglevel:
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<input type="radio" name="loglevel" id="loglevel0"> None
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<input type="radio" name="loglevel" id="loglevel1"> Error
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<input type="radio" name="loglevel" id="loglevel2" checked> Warning
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<input type="radio" name="loglevel" id="loglevel3"> Notice
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<input type="radio" name="loglevel" id="loglevel4"> Info
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<input type="radio" name="loglevel" id="loglevel5"> Debug <br />
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<button onclick="on_start()">Start NCD</button>
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<button onclick="on_stop()">Request termination</button>
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<br />
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Note: if you get the interpreter stuck and unable to terminate, just refresh the page
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</body>
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</html>
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