// Detect browser quirks that we should be aware of.
function needsDynPrefix() {
var span = document.createElement("span");
span.innerHTML = "";
var scripts = span.getElementsByTagName("script");
return scripts.length == 0;
}
var dynPrefix = needsDynPrefix() ? "A" : "";
// Function versions of operators
function not(x) { return !x; }
function neg(x) { return -x; }
function eq(x, y) { return x == y; }
function plus(x, y) { return x + y; }
function minus(x, y) { return x - y; }
function times(x, y) { return x * y; }
function div(x, y) { return x / y; }
function mod(x, y) { return x % y; }
function lt(x, y) { return x < y; }
function le(x, y) { return x <= y; }
// Lists
function cons(v, ls) {
return { next : ls, data : v };
}
function rev(ls) {
var acc = null;
for (; ls; ls = ls.next)
acc = cons(ls.data, acc);
return acc;
}
function concat(ls1, ls2) {
var acc = ls2;
ls1 = rev(ls1);
for (; ls1; ls1 = ls1.next)
acc = cons(ls1.data, acc);
return acc;
}
function member(x, ls) {
for (; ls; ls = ls.next)
if (ls.data == x)
return true;
return false;
}
function remove(x, ls) {
var acc = null;
for (; ls; ls = ls.next)
if (ls.data == x)
return concat(acc, ls.next);
else
acc = cons(ls.data, acc);
return ls;
}
function union(ls1, ls2) {
var acc = ls2;
for (; ls1; ls1 = ls1.next)
if (!member(ls1.data, ls2))
acc = cons(ls1.data, acc);
return acc;
}
function length(ls) {
var acc = 0;
for (; ls; ls = ls.next)
++acc;
return acc;
}
// Error handling
function whine(msg) {
alert(msg);
throw msg;
}
function pf(loc) {
throw ("Pattern match failure (" + loc + ")");
}
function runHandlers(kind, ls, arg) {
if (ls == null)
alert(kind + ": " + arg);
for (; ls; ls = ls.next)
try {
exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
} catch (v) { }
}
var errorHandlers = null;
function onError(f) {
errorHandlers = cons(f, errorHandlers);
}
function er(s) {
runHandlers("Error", errorHandlers, s);
throw {uw_error: s};
}
var failHandlers = null;
function onFail(f) {
failHandlers = cons(f, failHandlers);
}
function doExn(v) {
if (v == null || v.uw_error == null) {
var s = (v == null ? "null" : v.message ? v.message : v.toString());
if (v != null && v.fileName && v.lineNumber)
s += " (" + v.fileName + ":" + v.lineNumber + ")";
runHandlers("Fail", failHandlers, s);
}
}
var disconnectHandlers = null;
function flift(f) {
return {env:cons(f,null), body:{c:"v", n:1}};
}
function onDisconnect(f) {
disconnectHandlers = cons(flift(f), disconnectHandlers);
}
function discon() {
runHandlers("Disconnect", disconnectHandlers, null);
}
var connectHandlers = null;
function onConnectFail(f) {
connectHandlers = cons(flift(f), connectHandlers);
}
function conn() {
runHandlers("Connect", connectHandlers, null);
}
var serverHandlers = null;
function onServerError(f) {
serverHandlers = cons(f, serverHandlers);
}
function servErr(s) {
window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
}
// Embedding closures in XML strings
function cs(f) {
return {closure: f};
}
function isWeird(v) {
return v.closure != null || v.cat1 != null;
}
function cat(s1, s2) {
if (isWeird(s1) || isWeird(s2))
return {cat1: s1, cat2: s2};
else
return s1 + s2;
}
var closures = [];
var freeClosures = null;
function newClosure(f) {
var n;
if (freeClosures == null) {
n = closures.length;
} else {
n = freeClosures.data;
freeClosures = freeClosures.next;
}
closures[n] = f;
return n;
}
function freeClosure(n) {
closures[n] = null;
freeClosures = cons(n, freeClosures);
}
function cr(n) {
return closures[n];
}
function flatten(cls, tr) {
if (tr.cat1 != null)
return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
else if (tr.closure != null) {
var cl = newClosure(tr.closure);
cls.v = cons(cl, cls.v);
return "cr(" + cl + ")";
} else
return tr;
}
function flattenLocal(s) {
var cls = {v : null};
var r = flatten(cls, s);
for (cl = cls.v; cl != null; cl = cl.next)
freeClosure(cl.data);
return r;
}
// Dynamic tree management
function populate(node) {
var s = node.signal;
var oldSources = node.sources;
try {
var sr = execF(s, null);
var newSources = sr._sources;
for (var sp = oldSources; sp; sp = sp.next)
if (!member(sp.data, newSources))
sp.data.dyns = remove(node, sp.data.dyns);
for (var sp = newSources; sp; sp = sp.next)
if (!member(sp.data, oldSources))
sp.data.dyns = cons(node, sp.data.dyns);
node.sources = newSources;
node.recreate(sr._data);
} catch (v) {
doExn(v);
}
}
function sc(v) {
return {data : v, dyns : null};
}
function sv(s, v) {
s.data = v;
for (var ls = s.dyns; ls; ls = ls.next)
if (!ls.dead)
populate(ls.data);
}
function sg(s) {
return s.data;
}
function ss(s) {
return {env:cons(s, null), body:{c:"r", l:
cons({n:"sources", v:{c:"c", v:cons(s, null)}},
cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
}
function sr(v) {
return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
}
function sb(x,y) {
return {env:cons(y,cons(x,null)),
body:{c:"=",
e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
e2:{c:"=",
e1:{c:"a",
f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
x:{c:"c", v:null}},
e2:{c:"r", l:cons(
{n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
}
function scur(s) {
return execF(s, null)._data;
}
function lastParent() {
var pos = document;
while (pos.lastChild && pos.lastChild.nodeType == 1)
pos = pos.lastChild;
pos = pos.parentNode;
return pos;
}
function parent() {
return thisScript ? thisScript.parentNode : lastParent();
}
function addNode(node) {
if (thisScript)
thisScript.parentNode.replaceChild(node, thisScript);
else
lastParent().appendChild(node);
}
var thisScript = null;
function runScripts(node) {
if (node.getElementsByTagName) {
var savedScript = thisScript;
var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
var len = scripts.length;
for (var i = 0; i < len; ++i)
scriptsCopy[i] = scripts[i];
for (var i = 0; i < len; ++i) {
thisScript = scriptsCopy[i];
try {
eval(thisScript.text);
} catch (v) {
doExn(v);
}
if (thisScript.parentNode)
thisScript.parentNode.removeChild(thisScript);
}
thisScript = savedScript;
}
}
// Dynamic tree entry points
function killScript(scr) {
scr.dead = true;
for (var ls = scr.sources; ls; ls = ls.next)
ls.data.dyns = remove(scr, ls.data.dyns);
for (var ls = scr.closures; ls; ls = ls.next)
freeClosure(ls.data);
}
function dyn(pnode, s) {
var x = document.createElement("script");
x.dead = false;
x.signal = s;
x.sources = null;
x.closures = null;
var firstChild = null;
x.recreate = function(v) {
for (var ls = x.closures; ls; ls = ls.next)
freeClosure(ls.data);
var next;
for (var child = firstChild; child && child != x; child = next) {
next = child.nextSibling;
killScript(child);
if (child.getElementsByTagName) {
var arr = child.getElementsByTagName("script");
for (var i = 0; i < arr.length; ++i)
killScript(arr[i]);
}
if (child.parentNode)
child.parentNode.removeChild(child);
}
var cls = {v : null};
var html = flatten(cls, v);
if (pnode != "table" && pnode != "tr")
html = dynPrefix + html;
x.closures = cls.v;
if (pnode == "table") {
var dummy = document.createElement("body");
dummy.innerHTML = "
";
runScripts(dummy);
var table = x.parentNode;
if (table) {
firstChild = null;
var tbody;
var arr = dummy.getElementsByTagName("tbody");
var tbody;
if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
tbody = arr[0];
var next;
for (var node = dummy.firstChild.firstChild; node; node = next) {
next = node.nextSibling;
if (node.tagName != "TBODY")
tbody.appendChild(node);
}
} else
tbody = dummy.firstChild;
var next;
firstChild = document.createElement("script");
table.insertBefore(firstChild, x);
for (var node = tbody.firstChild; node; node = next) {
next = node.nextSibling;
table.insertBefore(node, x);
}
}
} else if (pnode == "tr") {
var dummy = document.createElement("body");
dummy.innerHTML = "";
runScripts(dummy);
var table = x.parentNode;
if (table) {
var arr = dummy.getElementsByTagName("tr");
firstChild = null;
var tr;
if (arr.length > 0 && table != null)
tr = arr[0];
else
tr = dummy.firstChild;
var next;
firstChild = document.createElement("script");
table.insertBefore(firstChild, x);
for (var node = tr.firstChild; node; node = next) {
next = node.nextSibling;
table.insertBefore(node, x);
}
}
} else {
firstChild = document.createElement("span");
firstChild.innerHTML = html;
runScripts(firstChild);
if (x.parentNode)
x.parentNode.insertBefore(firstChild, x);
}
};
addNode(x);
populate(x);
}
function input(x, s, recreate, type) {
if (type) x.type = type;
x.dead = false;
x.signal = ss(s);
x.sources = null;
x.recreate = recreate(x);
addNode(x);
populate(x);
return x;
}
function inp(s) {
var x = input(document.createElement("input"), s,
function(x) { return function(v) { if (x.value != v) x.value = v; }; });
x.value = s.data;
x.onkeyup = function() { sv(s, x.value) };
return x;
}
function sel(s, content) {
var dummy = document.createElement("span");
dummy.innerHTML = "";
var x = input(dummy.firstChild, s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
x.value = s.data;
if (x.value != s.data)
sv(s, x.value);
x.onchange = function() { sv(s, x.value) };
return x;
}
function chk(s) {
var x = input(document.createElement("input"), s,
function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
x.checked = s.data;
x.onchange = function() { sv(s, x.checked) };
return x;
}
function addOnChange(x, f) {
var old = x.onchange;
x.onchange = function() { old(); f (); };
}
// Basic string operations
function eh(x) {
if (x == null)
return "NULL";
else
return x.split("&").join("&").split("<").join("<").split(">").join(">");
}
function ts(x) { return x.toString() }
function bs(b) { return (b ? "True" : "False") }
function sub(s, i) { return s.charAt(i); }
function suf(s, i) { return s.substring(i); }
function slen(s) { return s.length; }
function sidx(s, ch) {
var r = s.indexOf(ch);
if (r == -1)
return null;
else
return r;
}
function sspn(s, chs) {
for (var i = 0; i < s.length; ++i)
if (chs.indexOf(s.charAt(i)) != -1)
return i;
return null;
}
function schr(s, ch) {
var r = s.indexOf(ch);
if (r == -1)
return null;
else
return s.substring(r);
}
function ssub(s, start, len) {
return s.substring(start, start+len);
}
function pi(s) {
var r = parseInt(s);
if (r.toString() == s)
return r;
else
er("Can't parse int: " + s);
}
function pfl(s) {
var r = parseFloat(s);
if (r.toString() == s)
return r;
else
er("Can't parse float: " + s);
}
function pio(s) {
var r = parseInt(s);
if (r.toString() == s)
return r;
else
return null;
}
function pflo(s) {
var r = parseFloat(s);
if (r.toString() == s)
return r;
else
return null;
}
function uf(s) {
if (s.length == 0)
return "_";
return (s.charAt(0) == '_' ? "_" : "")
+ escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
}
function uu(s) {
if (s.length > 0 && s.charAt(0) == '_') {
s = s.substring(1);
} else if (s.length >= 3 && s.charAt(0) == '%' && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
s = s.substring(3);
return unescape(s.replace(new RegExp ("\\+", "g"), " "));
}
function ub(b) {
return b ? "1" : "0";
}
function uul(getToken, getData) {
var tok = getToken();
if (tok == "Nil") {
return null;
} else if (tok == "Cons") {
var d = getData();
var l = uul(getToken, getData);
return {_1:d, _2:l};
} else
whine("Can't unmarshal list (" + tok + ")");
}
function strcmp(str1, str2) {
return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
}
// Remote calls
var client_id = null;
var client_pass = 0;
var url_prefix = "/";
var timeout = 60;
function getXHR(uri)
{
try {
return new XMLHttpRequest();
} catch (e) {
try {
return new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
return new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
whine("Your browser doesn't seem to support AJAX.");
}
}
}
}
var sig = null;
function requestUri(xhr, uri, needsSig) {
xhr.open("POST", uri, true);
if (client_id != null) {
xhr.setRequestHeader("UrWeb-Client", client_id.toString());
xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
}
if (needsSig) {
if (sig == null)
whine("Missing cookie signature!");
xhr.setRequestHeader("UrWeb-Sig", sig);
}
xhr.send(null);
}
function rc(prefix, uri, parse, k, needsSig) {
uri = cat(prefix, uri);
uri = flattenLocal(uri);
var xhr = getXHR();
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
var isok = false;
try {
if (xhr.status == 200)
isok = true;
} catch (e) { }
if (isok) {
try {
k(parse(xhr.responseText));
} catch (v) {
doExn(v);
}
} else {
conn();
}
}
};
requestUri(xhr, uri, needsSig);
}
function path_join(s1, s2) {
if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
return s1 + s2;
else
return s1 + "/" + s2;
}
var channels = [];
function newQueue() {
return { front : null, back : null };
}
function enqueue(q, v) {
if (q.front == null) {
q.front = cons(v, null);
q.back = q.front;
} else {
var node = cons(v, null);
q.back.next = node;
q.back = node;
}
}
function dequeue(q) {
if (q.front == null)
return null;
else {
var r = q.front.data;
q.front = q.front.next;
if (q.front == null)
q.back = null;
return r;
}
}
function newChannel() {
return { msgs : newQueue(), listeners : newQueue() };
}
function listener() {
var uri = path_join(url_prefix, ".msgs");
var xhr = getXHR();
var tid, orsc, onTimeout;
var connect = function () {
xhr.onreadystatechange = orsc;
tid = window.setTimeout(onTimeout, timeout * 500);
requestUri(xhr, uri, false);
}
orsc = function() {
if (xhr.readyState == 4) {
window.clearTimeout(tid);
var isok = false;
try {
if (xhr.status == 200)
isok = true;
} catch (e) { }
if (isok) {
var text = xhr.responseText
if (text == "")
return;
var lines = text.split("\n");
if (lines.length < 2) {
discon();
return;
}
for (var i = 0; i+1 < lines.length; i += 2) {
var chn = lines[i];
var msg = lines[i+1];
if (chn < 0)
whine("Out-of-bounds channel in message from remote server");
var ch;
if (chn >= channels.length || channels[chn] == null) {
ch = newChannel();
channels[chn] = ch;
} else
ch = channels[chn];
var listener = dequeue(ch.listeners);
if (listener == null) {
enqueue(ch.msgs, msg);
} else {
try {
listener(msg);
} catch (v) {
doExn(v);
}
}
}
xhr.abort();
connect();
}
else {
try {
if (xhr.status != 0)
servErr("Error querying remote server for messages: " + xhr.status);
} catch (e) { }
}
}
};
onTimeout = function() {
xhr.abort();
connect();
};
connect();
}
function rv(chn, parse, k) {
if (chn == null)
return;
if (chn < 0)
whine("Out-of-bounds channel receive");
var ch;
if (chn >= channels.length || channels[chn] == null) {
ch = newChannel();
channels[chn] = ch;
} else
ch = channels[chn];
var msg = dequeue(ch.msgs);
if (msg == null) {
enqueue(ch.listeners, function(msg) { k(parse(msg)); });
} else {
try {
k(parse(msg));
} catch (v) {
doExn(v);
}
}
}
function sl(ms, k) {
window.setTimeout(function() { k(null); }, ms);
}
function sp(e) {
execF(e, null);
}
// Key events
var uw_event = null;
function kc() {
return window.event ? uw_event.keyCode : uw_event.which;
}
// The Ur interpreter
var urfuncs = [];
function lookup(env, n) {
while (env != null) {
if (n == 0)
return env.data;
else {
--n;
env = env.next;
}
}
whine("Out-of-bounds Ur variable reference");
}
function execP(env, p, v) {
switch (p.c) {
case "w":
return env;
case "v":
return cons(v, env);
case "c":
if (v == p.v)
return env;
else
return false;
case "s":
if (v == null)
return false;
else
return execP(env, p.p, p.n ? v.v : v);
case "1":
if (v.n != p.n)
return false;
else
return execP(env, p.p, v.v);
case "r":
for (var fs = p.l; fs != null; fs = fs.next) {
env = execP(env, fs.data.p, v["_" + fs.data.n]);
if (env == false)
return false;
}
return env;
default:
whine("Unknown Ur pattern kind" + p.c);
}
}
function exec0(env, e) {
return exec1(env, null, e);
}
function exec1(env, stack, e) {
var stack, usedK = false;
var saveEnv = function() {
if (stack.next != null && stack.next.data.c != "<")
stack = cons({c: "<", env: env}, stack.next);
else
stack = stack.next;
};
while (true) {
switch (e.c) {
case "c":
var v = e.v;
if (stack == null)
return v;
var fr = stack.data;
switch (fr.c) {
case "s":
e = {c: "c", v: {v: v}};
stack = stack.next;
break;
case "1":
e = {c: "c", v: {n: fr.n, v: v}};
stack = stack.next;
break;
case "f":
fr.args[fr.pos++] = v;
if (fr.a == null) {
var res;
stack = stack.next;
if (fr.f.apply)
res = fr.f.apply(null, fr.args);
else if (fr.args.length == 0)
res = fr.f();
else if (fr.args.length == 1)
res = fr.f(fr.args[0]);
else if (fr.args.length == 2)
res = fr.f(fr.args[0], fr.args[1]);
else if (fr.args.length == 3)
res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
else if (fr.args.length == 4)
res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
else if (fr.args.length == 5)
res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
else
whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
e = {c: "c", v: res};
if (usedK) return null;
} else {
e = fr.a.data;
fr.a = fr.a.next;
}
break;
case "a1":
e = fr.x;
stack = cons({c: "a2", f: v}, stack.next);
break;
case "a2":
if (fr.f == null)
whine("Ur: applying null function");
else if (fr.f.body) {
saveEnv();
env = cons(v, fr.f.env);
e = fr.f.body;
} else {
e = {c: "c", v: fr.f(v)};
stack = stack.next;
}
break;
case "<":
env = fr.env;
stack = stack.next;
break;
case "r":
fr.fs["_" + fr.n] = v;
if (fr.l == null) {
e = {c: "c", v: fr.fs};
stack = stack.next;
} else {
fr.n = fr.l.data.n;
e = fr.l.data.v;
fr.l = fr.l.next;
}
break;
case ".":
e = {c: "c", v: v["_" + fr.f]};
stack = stack.next;
break;
case ";":
e = fr.e2;
stack = stack.next;
break;
case "=":
saveEnv();
env = cons(v, env);
e = fr.e2;
break;
case "m":
var ps;
for (ps = fr.p; ps != null; ps = ps.next) {
var r = execP(env, ps.data.p, v);
if (r != false) {
saveEnv();
env = r;
e = ps.data.b;
break;
}
}
if (ps == null)
whine("Match failure in Ur interpretation");
break;
default:
whine("Unknown Ur continuation kind " + fr.c);
}
break;
case "v":
e = {c: "c", v: lookup(env, e.n)};
break;
case "n":
e = urfuncs[e.n];
break;
case "s":
stack = cons({c: "s"}, stack);
e = e.v;
break;
case "1":
stack = cons({c: "1", n: e.n}, stack);
e = e.v;
break;
case "f":
if (e.a == null)
e = {c: "c", v: e.f()};
else {
var args = [];
stack = cons({c: "f", f: e.f, args: args, pos: 0, a: e.a.next}, stack);
if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
e = e.a.data;
}
break;
case "l":
e = {c: "c", v: {env: env, body: e.b}};
break;
case "a":
stack = cons({c: "a1", x: e.x}, stack);
e = e.f;
break;
case "r":
if (e.l == null)
whine("Empty Ur record in interpretation");
var fs = {};
stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
e = e.l.data.v;
break;
case ".":
stack = cons({c: ".", f: e.f}, stack);
e = e.r;
break;
case ";":
stack = cons({c: ";", e2: e.e2}, stack);
e = e.e1;
break;
case "=":
stack = cons({c: "=", e2: e.e2}, stack);
e = e.e1;
break;
case "m":
stack = cons({c: "m", p: e.p}, stack);
e = e.e;
break;
case "e":
e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
break;
case "wc":
env = e.env;
e = e.body;
break;
case "K":
{ var savedStack = stack.next, savedEnv = env;
e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
usedK = true;
break;
default:
whine("Unknown Ur expression kind " + e.c);
}
}
}
function execD(e) {
return exec0(null, e);
}
function exec(e) {
var r = exec0(null, e);
if (r != null && r.body != null)
return function(v) { return exec0(cons(v, r.env), r.body); };
else
return r;
}
function execF(f, x) {
return exec0(cons(x, f.env), f.body);
}
// App-specific code