adamc@970: // Function versions of operators
adamc@970: 
adamc@970: function not(x) { return !x; }
adamc@970: function neg(x) { return -x; }
adamc@970: 
adamc@970: function eq(x, y) { return x == y; }
adamc@970: function plus(x, y) { return x + y; }
adamc@970: function minus(x, y) { return x - y; }
adamc@970: function times(x, y) { return x * y; }
adamc@970: function div(x, y) { return x / y; }
adamc@970: function mod(x, y) { return x % y; }
adamc@970: function lt(x, y) { return x < y; }
adamc@970: function le(x, y) { return x <= y; }
adamc@970: 
adamc@692: // Lists
adamc@692: 
adamc@580: function cons(v, ls) {
adamc@690:   return { next : ls, data : v };
adamc@690: }
adamc@969: function rev(ls) {
adamc@969:   var acc = null;
adamc@969:   for (; ls; ls = ls.next)
adamc@969:     acc = cons(ls.data, acc);
adamc@969:   return acc;
adamc@969: }
adamc@690: function concat(ls1, ls2) {
adamc@969:   var acc = ls2;
adamc@969:   ls1 = rev(ls1);
adamc@969:   for (; ls1; ls1 = ls1.next)
adamc@969:     acc = cons(ls1.data, acc);
adamc@969:   return acc;
adamc@690: }
adamc@690: function member(x, ls) {
adamc@690:   for (; ls; ls = ls.next)
adamc@690:     if (ls.data == x)
adamc@690:       return true;
adamc@690:   return false;
adamc@690: }
adamc@690: function remove(x, ls) {
adamc@969:   var acc = null;
adamc@969: 
adamc@969:   for (; ls; ls = ls.next)
adamc@969:     if (ls.data == x)
adamc@969:       return concat(acc, ls.next);
adamc@969:     else
adamc@969:       acc = cons(ls.data, acc);
adamc@969: 
adamc@969:   return ls;
adamc@690: }
adamc@690: function union(ls1, ls2) {
adamc@969:   var acc = ls2;
adamc@969: 
adamc@969:   for (; ls1; ls1 = ls1.next)
adamc@969:     if (!member(ls1.data, ls2))
adamc@969:       acc = cons(ls1.data, acc);
adamc@969: 
adamc@969:   return acc;
adamc@580: }
adamc@703: function length(ls) {
adamc@969:   var acc = 0;
adamc@969: 
adamc@969:   for (; ls; ls = ls.next)
adamc@969:     ++acc;
adamc@969: 
adamc@969:   return acc;
adamc@703: }
adamc@670: 
adamc@690: 
adamc@729: // Error handling
adamc@729: 
adamc@729: function whine(msg) {
adamc@729:   alert(msg);
adamc@729:   throw msg;
adamc@729: }
adamc@729: 
adamc@810: function pf(loc) {
adamc@835:   throw ("Pattern match failure (" + loc + ")");
adamc@729: }
adamc@729: 
adamc@798: function runHandlers(kind, ls, arg) {
adamc@798:   if (ls == null)
adamc@798:     alert(kind + ": " + arg);
adamc@729:   for (; ls; ls = ls.next)
adamc@729:     try {
adamc@976:       exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adamc@729:     } catch (v) { }
adamc@729: }
adamc@729: 
adamc@729: var errorHandlers = null;
adamc@729: 
adamc@729: function onError(f) {
adamc@729:   errorHandlers = cons(f, errorHandlers);
adamc@729: }
adamc@729: 
adamc@729: function er(s) {
adamc@798:   runHandlers("Error", errorHandlers, s);
adamc@729:   throw {uw_error: s};
adamc@729: }
adamc@729: 
adamc@729: var failHandlers = null;
adamc@729: 
adamc@729: function onFail(f) {
adamc@729:   failHandlers = cons(f, failHandlers);
adamc@729: }
adamc@729: 
adamc@729: function doExn(v) {
adamc@729:   if (v == null || v.uw_error == null) {
adamc@729:     var s = (v == null ? "null" : v.toString());
adamc@969:     if (v != null && v.fileName && v.lineNumber)
adamc@969:       s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@798:     runHandlers("Fail", failHandlers, s);
adamc@729:   }
adamc@729: }
adamc@729: 
adamc@729: var disconnectHandlers = null;
adamc@729: 
adamc@976: function flift(f) {
adamc@977:   return {env:cons(f,null), body:{c:"v", n:1}};
adamc@976: }
adamc@976: 
adamc@729: function onDisconnect(f) {
adamc@976:   disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729: }
adamc@729: 
adamc@729: function discon() {
adamc@798:   runHandlers("Disconnect", disconnectHandlers, null);
adamc@729: }
adamc@729: 
adamc@729: var connectHandlers = null;
adamc@729: 
adamc@729: function onConnectFail(f) {
adamc@976:   connectHandlers = cons(flift(f), connectHandlers);
adamc@729: }
adamc@729: 
adamc@729: function conn() {
adamc@798:   runHandlers("Connect", connectHandlers, null);
adamc@729: }
adamc@729: 
adamc@729: var serverHandlers = null;
adamc@729: 
adamc@729: function onServerError(f) {
adamc@729:   serverHandlers = cons(f, serverHandlers);
adamc@729: }
adamc@729: 
adamc@729: function servErr(s) {
adamc@824:   window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729: }
adamc@729: 
adamc@729: 
adamc@692: // Embedding closures in XML strings
adamc@692: 
adamc@693: function cs(f) {
adamc@693:   return {closure: f};
adamc@693: }
adamc@693: 
adamc@693: function isWeird(v) {
adamc@693:   return v.closure != null || v.cat1 != null;
adamc@693: }
adamc@693: 
adamc@692: function cat(s1, s2) {
adamc@693:   if (isWeird(s1) || isWeird(s2))
adamc@693:     return {cat1: s1, cat2: s2};
adamc@693:   else
adamc@692:     return s1 + s2;
adamc@692: }
adamc@692: 
adamc@692: var closures = [];
adamc@703: var freeClosures = null;
adamc@692: 
adamc@692: function newClosure(f) {
adamc@703:   var n;
adamc@703:   if (freeClosures == null) {
adamc@703:     n = closures.length;
adamc@703:   } else {
adamc@703:     n = freeClosures.data;
adamc@703:     freeClosures = freeClosures.next;
adamc@703:   }
adamc@692:   closures[n] = f;
adamc@692:   return n;
adamc@692: }
adamc@692: 
adamc@703: function freeClosure(n) {
adamc@703:   closures[n] = null;
adamc@703:   freeClosures = cons(n, freeClosures);
adamc@703: }
adamc@703: 
adamc@692: function cr(n) {
adamc@975:   return closures[n];
adamc@692: }
adamc@692: 
adamc@703: function flatten(cls, tr) {
adamc@693:   if (tr.cat1 != null)
adamc@703:     return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@703:   else if (tr.closure != null) {
adamc@703:     var cl = newClosure(tr.closure);
adamc@703:     cls.v = cons(cl, cls.v);
adamc@703:     return "cr(" + cl + ")";
adamc@703:   } else
adamc@692:     return tr;
adamc@692: }
adamc@692: 
adamc@728: function flattenLocal(s) {
adamc@728:   var cls = {v : null};
adamc@728:   var r = flatten(cls, s);
adamc@728:   for (cl = cls.v; cl != null; cl = cl.next)
adamc@728:     freeClosure(cl.data);
adamc@728:   return r;
adamc@728: }
adamc@728: 
adamc@692: 
adamc@692: 
adamc@692: // Dynamic tree management
adamc@692: 
adamc@690: function populate(node) {
adamc@690:   var s = node.signal;
adamc@690:   var oldSources = node.sources;
adamc@729:   try {
adamc@977:     var sr = execF(s, null);
adamc@976:     var newSources = sr._sources;
adamc@690: 
adamc@729:     for (var sp = oldSources; sp; sp = sp.next)
adamc@729:       if (!member(sp.data, newSources))
adamc@729:         sp.data.dyns = remove(node, sp.data.dyns);
adamc@690: 
adamc@729:     for (var sp = newSources; sp; sp = sp.next)
adamc@729:       if (!member(sp.data, oldSources))
adamc@729:         sp.data.dyns = cons(node, sp.data.dyns);
adamc@690: 
adamc@729:     node.sources = newSources;
adamc@976:     node.recreate(sr._data);
adamc@729:   } catch (v) {
adamc@729:     doExn(v);
adamc@729:   }
adamc@579: }
adamc@574: 
adamc@580: function sc(v) {
adamc@690:   return {data : v, dyns : null};
adamc@580: }
adamc@580: function sv(s, v) {
adamc@690:   s.data = v;
adamc@967: 
adamc@690:   for (var ls = s.dyns; ls; ls = ls.next)
adamc@690:     if (!ls.dead)
adamc@690:       populate(ls.data);
adamc@580: }
adamc@601: function sg(s) {
adamc@690:   return s.data;
adamc@601: }
adamc@579: 
adamc@580: function ss(s) {
adamc@976:   return {env:cons(s, null), body:{c:"r", l:
adamc@976:     cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@976:       cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580: }
adamc@580: function sr(v) {
adamc@976:   return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580: }
adamc@580: function sb(x,y) {
adamc@976:   return {env:cons(y,cons(x,null)),
adamc@976:     body:{c:"=",
adamc@977:       e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@976:       e2:{c:"=",
adamc@976:         e1:{c:"a",
adamc@977:           f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@976:           x:{c:"c", v:null}},
adamc@976:         e2:{c:"r", l:cons(
adamc@976:           {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@976:             cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@976:           cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580: }
adamc@841: function scur(s) {
adamc@982:   return execF(s, null)._data;
adamc@841: }
adamc@571: 
adamc@604: function lastParent() {
adamc@604:   var pos = document;
adamc@604: 
adamc@600:   while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@600:     pos = pos.lastChild;
adamc@600: 
adamc@600:   return pos.parentNode;
adamc@600: }
adamc@600: 
adamc@898: function parent() {
adamc@898:   return thisScript ? thisScript.parentNode : lastParent();
adamc@898: }
adamc@898: 
adamc@604: function addNode(node) {
adamc@899:   if (thisScript)
adamc@899:     thisScript.parentNode.replaceChild(node, thisScript);
adamc@899:   else
adamc@604:     lastParent().appendChild(node);
adamc@603: }
adamc@603: 
adamc@690: var thisScript = null;
adamc@690: 
adamc@604: function runScripts(node) {
adamc@899:   if (node.getElementsByTagName) {
adamc@899:     var savedScript = thisScript;
adamc@603: 
adamc@899:     var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@899:     var len = scripts.length;
adamc@899:     for (var i = 0; i < len; ++i)
adamc@899:       scriptsCopy[i] = scripts[i];
adamc@899:     for (var i = 0; i < len; ++i) {
adamc@899:       thisScript = scriptsCopy[i];
adamc@899:       try {
adamc@899:         eval(thisScript.textContent);
adamc@899:       } catch (v) {
adamc@899:         doExn(v);
adamc@899:       }
adamc@899:       if (thisScript.parentNode)
adamc@901:         thisScript.parentNode.removeChild(thisScript);
adamc@729:     }
adamc@899: 
adamc@899:     thisScript = savedScript;
adamc@604:   }
adamc@603: }
adamc@603: 
adamc@603: 
adamc@692: // Dynamic tree entry points
adamc@692: 
adamc@967: function killScript(scr) {
adamc@967:   scr.dead = true;
adamc@967:   for (var ls = scr.sources; ls; ls = ls.next)
adamc@967:     ls.data.dyns = remove(scr, ls.data.dyns);
adamc@967:   for (var ls = scr.closures; ls; ls = ls.next)
adamc@967:     freeClosure(ls.data);
adamc@967: }
adamc@967: 
adamc@901: function dyn(pnode, s) {
adamc@901:   var x = document.createElement("script");
adamc@690:   x.dead = false;
adamc@690:   x.signal = s;
adamc@690:   x.sources = null;
adamc@703:   x.closures = null;
adamc@899: 
adamc@902:   var firstChild = null;
adamc@899: 
adamc@690:   x.recreate = function(v) {
adamc@703:     for (var ls = x.closures; ls; ls = ls.next)
adamc@703:       freeClosure(ls.data);
adamc@692: 
adamc@902:     var next;
adamc@902:     for (var child = firstChild; child && child != x; child = next) {
adamc@902:       next = child.nextSibling;
adamc@967:       killScript(child);
adamc@901:       if (child.getElementsByTagName) {
adamc@901:         var arr = child.getElementsByTagName("script");
adamc@967:         for (var i = 0; i < arr.length; ++i)
adamc@967:           killScript(arr[i]);
adamc@847:       }
adamc@847: 
adamc@901:       if (child.parentNode)
adamc@901:         child.parentNode.removeChild(child);
adamc@899:     }
adamc@690: 
adamc@703:     var cls = {v : null};
adamc@901:     var html = flatten(cls, v);
adamc@703:     x.closures = cls.v;
adamc@899: 
adamc@901:     if (pnode == "table") {
adamc@901:       var dummy = document.createElement("body");
adamc@901:       dummy.innerHTML = "<table>" + html + "</table>";
adamc@901:       runScripts(dummy);
adamc@901:       var table = x.parentNode;
adamc@901: 
adamc@946:       if (table) {
adamc@946:         var arr = dummy.getElementsByTagName("tbody");
adamc@946:         firstChild = null;
adamc@946:         var tbody;
adamc@946:         if (arr.length > 0 && table != null)
adamc@946:           tbody = arr[0];
adamc@946:         else
adamc@946:           tbody = dummy.firstChild;
adamc@945: 
adamc@946:         var next;
adamc@946:         firstChild = document.createElement("script");
adamc@946:         table.insertBefore(firstChild, x);
adamc@946:         for (var node = tbody.firstChild; node; node = next) {
adamc@946:           next = node.nextSibling;
adamc@946:           table.insertBefore(node, x);
adamc@946:         }
adamc@901:       }
adamc@903:     } else if (pnode == "tr") {
adamc@903:       var dummy = document.createElement("body");
adamc@903:       dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@903:       runScripts(dummy);
adamc@903:       var table = x.parentNode;
adamc@903: 
adamc@946:       if (table) {
adamc@946:         var arr = dummy.getElementsByTagName("tr");
adamc@946:         firstChild = null;
adamc@946:         var tbody;
adamc@946:         if (arr.length > 0 && table != null)
adamc@946:           tbody = arr[0];
adamc@946:         else
adamc@946:           tbody = dummy.firstChild;
adamc@946: 
adamc@946:         var next;
adamc@903:         firstChild = document.createElement("script");
adamc@903:         table.insertBefore(firstChild, x);
adamc@903:         for (var node = tbody.firstChild; node; node = next) {
adamc@903:           next = node.nextSibling;
adamc@903:           table.insertBefore(node, x);
adamc@903:         }
adamc@903:       }
adamc@901:     } else {
adamc@902:       firstChild = document.createElement("span");
adamc@902:       firstChild.innerHTML = html;
adamc@902:       runScripts(firstChild);
adamc@900:       if (x.parentNode)
adamc@902:         x.parentNode.insertBefore(firstChild, x);
adamc@899:     }
adamc@690:   };
adamc@899: 
adamc@899:   addNode(x);
adamc@690:   populate(x);
adamc@571: }
adamc@582: 
adamc@817: function input(t, s, recreate) {
adamc@598:   var x = document.createElement(t);
adamc@690:   x.dead = false;
adamc@690:   x.signal = ss(s);
adamc@690:   x.sources = null;
adamc@817:   x.recreate = recreate(x);
adamc@899:   addNode(x);
adamc@690:   populate(x);
adamc@816: 
adamc@816:   return x;
adamc@816: }
adamc@816: 
adamc@816: function inp(s) {
adamc@817:   var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816:   x.value = s.data;
adamc@816:   x.onkeyup = function() { sv(s, x.value) };
adamc@816: 
adamc@816:   return x;
adamc@816: }
adamc@816: 
adamc@816: function sel(s, content) {
adamc@817:   var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816:   x.innerHTML = content;
adamc@816:   x.value = s.data;
adamc@835:   if (x.value != s.data)
adamc@835:     sv(s, x.value);
adamc@816:   x.onchange = function() { sv(s, x.value) };
adamc@797: 
adamc@606:   return x;
adamc@598: }
adamc@598: 
adamc@817: function chk(s) {
adamc@817:   var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817:   x.type = "checkbox";
adamc@817:   x.checked = s.data;
adamc@817:   x.onchange = function() { sv(s, x.checked) };
adamc@817: 
adamc@817:   return x;
adamc@817: }
adamc@817: 
adamc@800: function addOnChange(x, f) {
adamc@800:   var old = x.onchange;
adamc@800:   x.onchange = function() { old(); f (); };
adamc@800: }
adamc@800: 
adamc@692: 
adamc@692: // Basic string operations
adamc@692: 
adamc@597: function eh(x) {
adamc@800:   if (x == null)
adamc@800:     return "NULL";
adamc@800:   else
adamc@800:     return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597: }
adamc@597: 
adamc@582: function ts(x) { return x.toString() }
adamc@586: function bs(b) { return (b ? "True" : "False") }
adamc@586: 
adamc@828: function sub(s, i) { return s[i]; }
adamc@828: function suf(s, i) { return s.substring(i); }
adamc@828: function slen(s) { return s.length; }
adamc@829: function sidx(s, ch) {
adamc@829:   var r = s.indexOf(ch);
adamc@829:   if (r == -1)
adamc@829:     return null;
adamc@829:   else
adamc@829:     return r;
adamc@829: }
adamc@831: function sspn(s, chs) {
adamc@831:   for (var i = 0; i < s.length; ++i)
adamc@831:     if (chs.indexOf(s[i]) != -1)
adamc@831:       return i;
adamc@831: 
adamc@831:   return null;
adamc@831: }
adamc@829: function schr(s, ch) {
adamc@829:   var r = s.indexOf(ch);
adamc@829:   if (r == -1)
adamc@829:     return null;
adamc@829:   else
adamc@829:     return s.substring(r);
adamc@829: }
adamc@829: function ssub(s, start, len) {
adamc@829:   return s.substring(start, start+len);
adamc@829: }
adamc@821: 
adamc@649: function pi(s) {
adamc@649:   var r = parseInt(s);
adamc@649:   if (r.toString() == s)
adamc@649:     return r;
adamc@649:   else
adamc@729:     er("Can't parse int: " + s);
adamc@649: }
adamc@649: 
adamc@649: function pfl(s) {
adamc@649:   var r = parseFloat(s);
adamc@649:   if (r.toString() == s)
adamc@649:     return r;
adamc@649:   else
adamc@729:     er("Can't parse float: " + s);
adamc@649: }
adamc@649: 
adamc@838: function pio(s) {
adamc@838:   var r = parseInt(s);
adamc@838:   if (r.toString() == s)
adamc@838:     return r;
adamc@838:   else
adamc@838:     return null;
adamc@838: }
adamc@838: 
adamc@838: function pflo(s) {
adamc@838:   var r = parseFloat(s);
adamc@838:   if (r.toString() == s)
adamc@838:     return r;
adamc@838:   else
adamc@838:     return null;
adamc@838: }
adamc@838: 
adamc@692: function uf(s) {
adamc@925:   if (s.length == 0)
adamc@925:     return "_";
adamc@925:   return (s[0] == '_' ? "_" : "")
adamc@925:         + escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691: }
adamc@691: 
adamc@692: function uu(s) {
adamc@925:   if (s.length > 0 && s[0] == '_')
adamc@925:     s = s.substring(1);
adamc@927:   else if (s.length >= 3 && s[0] == '%' && s[1] == '5' && (s[2] == 'f' || s[2] == 'F'))
adamc@927:     s = s.substring(3);
adamc@905:   return unescape(s.replace(new RegExp ("\\+", "g"), " "));
adamc@905: }
adamc@905: 
adamc@912: function ub(b) {
adamc@912:   return b ? "1" : "0";
adamc@912: }
adamc@912: 
adamc@905: function uul(getToken, getData) {
adamc@905:   var tok = getToken();
adamc@905:   if (tok == "Nil") {
adamc@905:     return null;
adamc@905:   } else if (tok == "Cons") {
adamc@905:     var d = getData();
adamc@905:     var l = uul(getToken, getData);
adamc@905:     return {_1:d, _2:l};
adamc@905:   } else
adamc@982:     whine("Can't unmarshal list (" + tok + ")");
adamc@692: }
adamc@692: 
adamc@961: function strcmp(str1, str2) {
adamc@961:   return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961: }
adamc@692: 
adamc@603: 
adamc@692: // Remote calls
adamc@609: 
adamc@703: var client_id = null;
adamc@668: var client_pass = 0;
adamc@668: var url_prefix = "/";
adamc@673: var timeout = 60;
adamc@668: 
adamc@668: function getXHR(uri)
adamc@609: {
adamc@609:   try {
adamc@609:     return new XMLHttpRequest();
adamc@609:   } catch (e) {
adamc@609:     try {
adamc@609:      return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609:     } catch (e) {
adamc@609:       try {
adamc@609:         return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609:       } catch (e) {
adamc@982:         whine("Your browser doesn't seem to support AJAX.");
adamc@609:       }
adamc@609:     }
adamc@609:   }
adamc@609: }
adamc@609: 
adamc@736: var sig = null;
adamc@736: 
adamc@736: function requestUri(xhr, uri, needsSig) {
adamc@668:   xhr.open("GET", uri, true);
adamc@668: 
adamc@703:   if (client_id != null) {
adamc@668:     xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668:     xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668:   }
adamc@668: 
adamc@736:   if (needsSig) {
adamc@736:     if (sig == null)
adamc@736:       whine("Missing cookie signature!");
adamc@736: 
adamc@736:     xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736:   }
adamc@736: 
adamc@668:   xhr.send(null);
adamc@668: }
adamc@668: 
adamc@978: function rc(prefix, uri, parse, k, needsSig) {
adamc@978:   uri = cat(prefix, uri);
adamc@728:   uri = flattenLocal(uri);
adamc@609:   var xhr = getXHR();
adamc@609: 
adamc@609:   xhr.onreadystatechange = function() {
adamc@612:     if (xhr.readyState == 4) {
adamc@612:       var isok = false;
adamc@612: 
adamc@612:       try {
adamc@612:         if (xhr.status == 200)
adamc@612:           isok = true;
adamc@612:       } catch (e) { }
adamc@612: 
adamc@729:       if (isok) {
adamc@729:         try {
adamc@1020:           k(parse(xhr.responseText));
adamc@729:         } catch (v) {
adamc@729:           doExn(v);
adamc@729:         }
adamc@729:       } else {
adamc@729:         conn();
adamc@649:       }
adamc@612:     }
adamc@609:   };
adamc@609: 
adamc@736:   requestUri(xhr, uri, needsSig);
adamc@609: }
adamc@667: 
adamc@667: function path_join(s1, s2) {
adamc@667:   if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667:     return s1 + s2;
adamc@667:   else
adamc@667:     return s1 + "/" + s2;
adamc@667: }
adamc@667: 
adamc@670: var channels = [];
adamc@670: 
adamc@670: function newQueue() {
adamc@670:   return { front : null, back : null };
adamc@670: }
adamc@670: function enqueue(q, v) {
adamc@670:   if (q.front == null) {
adamc@670:     q.front = cons(v, null);
adamc@670:     q.back = q.front;
adamc@670:   } else {
adamc@670:     var node = cons(v, null);
adamc@690:     q.back.next = node;
adamc@670:     q.back = node;
adamc@670:   }
adamc@670: }
adamc@670: function dequeue(q) {
adamc@670:   if (q.front == null)
adamc@670:     return null;
adamc@670:   else {
adamc@690:     var r = q.front.data;
adamc@690:     q.front = q.front.next;
adamc@670:     if (q.front == null)
adamc@670:       q.back = null;
adamc@670:     return r;
adamc@670:   }
adamc@670: }
adamc@670: 
adamc@670: function newChannel() {
adamc@670:   return { msgs : newQueue(), listeners : newQueue() };
adamc@670: }
adamc@670: 
adamc@667: function listener() {
adamc@668:   var uri = path_join(url_prefix, ".msgs");
adamc@667:   var xhr = getXHR();
adamc@673:   var tid, orsc, onTimeout;
adamc@673: 
adamc@673:   var connect = function () {
adamc@673:     xhr.onreadystatechange = orsc;
adamc@673:     tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736:     requestUri(xhr, uri, false);
adamc@673:   }
adamc@673: 
adamc@673:   orsc = function() {
adamc@667:     if (xhr.readyState == 4) {
adamc@673:       window.clearTimeout(tid);
adamc@673: 
adamc@667:       var isok = false;
adamc@667: 
adamc@667:       try {
adamc@667:         if (xhr.status == 200)
adamc@667:           isok = true;
adamc@667:       } catch (e) { }
adamc@667: 
adamc@668:       if (isok) {
adamc@889:         var text = xhr.responseText
adamc@889:         if (text == "")
adamc@889:           return;
adamc@889:         var lines = text.split("\n");
adamc@889: 
adamc@729:         if (lines.length < 2) {
adamc@729:           discon();
adamc@729:           return;
adamc@729:         }
adamc@669: 
adamc@669:         for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670:           var chn = lines[i];
adamc@670:           var msg = lines[i+1];
adamc@670: 
adamc@670:           if (chn < 0)
adamc@670:             whine("Out-of-bounds channel in message from remote server");
adamc@670: 
adamc@670:           var ch;
adamc@670: 
adamc@670:           if (chn >= channels.length || channels[chn] == null) {
adamc@670:             ch = newChannel();
adamc@670:             channels[chn] = ch;
adamc@670:           } else
adamc@670:             ch = channels[chn];
adamc@670: 
adamc@670:           var listener = dequeue(ch.listeners);
adamc@670:           if (listener == null) {
adamc@670:             enqueue(ch.msgs, msg);
adamc@670:           } else {
adamc@728:             try {
adamc@728:               listener(msg);
adamc@728:             } catch (v) {
adamc@728:               doExn(v);
adamc@728:             }
adamc@670:           }
adamc@669:         }
adamc@669: 
adamc@673:         connect();
adamc@668:       }
adamc@667:       else {
adamc@729:         try {
adamc@824:           if (xhr.status != 0)
adamc@824:             servErr("Error querying remote server for messages: " + xhr.status);
adamc@889:         } catch (e) { }
adamc@667:       }
adamc@667:     }
adamc@667:   };
adamc@667: 
adamc@673:   onTimeout = function() {
adamc@673:     xhr.abort();
adamc@673:     connect();
adamc@673:   };
adamc@673: 
adamc@673:   connect();
adamc@667: }
adamc@670: 
adamc@670: function rv(chn, parse, k) {
adamc@682:   if (chn == null)
adamc@682:     return;
adamc@682: 
adamc@670:   if (chn < 0)
adamc@670:     whine("Out-of-bounds channel receive");
adamc@670: 
adamc@670:   var ch;
adamc@670: 
adamc@670:   if (chn >= channels.length || channels[chn] == null) {
adamc@670:     ch = newChannel();
adamc@670:     channels[chn] = ch;
adamc@670:   } else
adamc@670:     ch = channels[chn];
adamc@670: 
adamc@670:   var msg = dequeue(ch.msgs);
adamc@670:   if (msg == null) {
adamc@1021:     enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@670:   } else {
adamc@728:     try {
adamc@1021:       k(parse(msg));
adamc@728:     } catch (v) {
adamc@728:       doExn(v);
adamc@728:     }
adamc@670:   }
adamc@670: }
adamc@693: 
adamc@978: function sl(ms, k) {
adamc@1021:   window.setTimeout(function() { k(null); }, ms);
adamc@1021: }
adamc@1021: 
adamc@1021: function sp(e) {
adamc@1021:   execF(e, null);
adamc@978: }
adamc@978: 
adamc@693: 
adamc@895: // Key events
adamc@895: 
adamc@970: var uw_event = null;
adamc@970: 
adamc@970: function kc() {
adamc@970:   return window.event ? uw_event.keyCode : uw_event.which;
adamc@970: }
adamc@970: 
adamc@970: 
adamc@970: // The Ur interpreter
adamc@970: 
adamc@970: var urfuncs = [];
adamc@970: 
adamc@970: function lookup(env, n) {
adamc@970:   while (env != null) {
adamc@970:     if (n == 0)
adamc@970:       return env.data;
adamc@970:     else {
adamc@970:       --n;
adamc@970:       env = env.next;
adamc@970:     }
adamc@970:   }
adamc@970: 
adamc@982:   whine("Out-of-bounds Ur variable reference");
adamc@970: }
adamc@970: 
adamc@974: function execP(env, p, v) {
adamc@974:   switch (p.c) {
adamc@974:   case "w":
adamc@974:     return env;
adamc@974:   case "v":
adamc@974:     return cons(v, env);
adamc@974:   case "c":
adamc@974:     if (v == p.v)
adamc@974:       return env;
adamc@974:     else
adamc@974:       return false;
adamc@974:   case "s":
adamc@974:     if (v == null)
adamc@974:       return false;
adamc@974:     else
adamc@974:       return execP(env, p.p, p.n ? v.v : v);
adamc@974:   case "1":
adamc@974:     if (v.n != p.n)
adamc@974:       return false;
adamc@974:     else
adamc@974:       return execP(env, p.p, v.v);
adamc@974:   case "r":
adamc@974:     for (var fs = p.l; fs != null; fs = fs.next) {
adamc@974:       env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@974:       if (env == false)
adamc@974:         return false;
adamc@974:     }
adamc@974:     return env;
adamc@974:   default:
adamc@982:     whine("Unknown Ur pattern kind" + p.c);
adamc@974:   }
adamc@974: }
adamc@974: 
adamc@970: function exec0(env, e) {
adamc@1020:   return exec1(env, null, e);
adamc@1020: }
adamc@1020: 
adamc@1020: function exec1(env, stack, e) {
adamc@1020:   var stack, usedK = false;
adamc@970: 
adamc@983:   var saveEnv = function() {
adamc@983:     if (stack.next != null && stack.next.data.c != "<")
adamc@983:       stack = cons({c: "<", env: env}, stack.next);
adamc@983:     else
adamc@983:       stack = stack.next;
adamc@983:   };
adamc@983: 
adamc@970:   while (true) {
adamc@970:     switch (e.c) {
adamc@970:     case "c":
adamc@970:       var v = e.v;
adamc@970:       if (stack == null)
adamc@970:         return v;
adamc@970:       var fr = stack.data;
adamc@970: 
adamc@970:       switch (fr.c) {
adamc@970:       case "s":
adamc@970:         e = {c: "c", v: {v: v}};
adamc@970:         stack = stack.next;
adamc@970:         break;
adamc@970:       case "1":
adamc@970:         e = {c: "c", v: {n: fr.n, v: v}};
adamc@970:         stack = stack.next;
adamc@970:         break;
adamc@970:       case "f":
adamc@970:         fr.args[fr.pos++] = v;
adamc@970:         if (fr.a == null) {
adamc@1020:           stack = stack.next;
adamc@970:           e = {c: "c", v: fr.f.apply(null, fr.args)};
adamc@1020:           if (usedK) return null;
adamc@970:         } else {
adamc@970:           e = fr.a.data;
adamc@970:           fr.a = fr.a.next;
adamc@970:         }
adamc@970:         break;
adamc@970:       case "a1":
adamc@970:         e = fr.x;
adamc@971:         stack = cons({c: "a2", f: v}, stack.next);
adamc@970:         break;
adamc@970:       case "a2":
adamc@971:         if (fr.f == null)
adamc@982:           whine("Ur: applying null function");
adamc@971:         else if (fr.f.body) {
adamc@983:           saveEnv();
adamc@971:           env = cons(v, fr.f.env);
adamc@971:           e = fr.f.body;
adamc@971:         } else {
adamc@971:           e = {c: "c", v: fr.f(v)};
adamc@971:           stack = stack.next;
adamc@971:         }
adamc@970:         break;
adamc@978:       case "<":
adamc@970:         env = fr.env;
adamc@970:         stack = stack.next;
adamc@970:         break;
adamc@970:       case "r":
adamc@970:         fr.fs["_" + fr.n] = v;
adamc@970:         if (fr.l == null) {
adamc@970:           e = {c: "c", v: fr.fs};
adamc@970:           stack = stack.next;
adamc@970:         } else {
adamc@970:           fr.n = fr.l.data.n;
adamc@970:           e = fr.l.data.v;
adamc@970:           fr.l = fr.l.next;
adamc@970:         }
adamc@970:         break;
adamc@970:       case ".":
adamc@970:         e = {c: "c", v: v["_" + fr.f]};
adamc@970:         stack = stack.next;
adamc@970:         break;
adamc@970:       case ";":
adamc@970:         e = fr.e2;
adamc@970:         stack = stack.next;
adamc@970:         break;
adamc@970:       case "=":
adamc@983:         saveEnv();
adamc@970:         env = cons(v, env);
adamc@970:         e = fr.e2;
adamc@970:         break;
adamc@974:       case "m":
adamc@974:         var ps;
adamc@974:         for (ps = fr.p; ps != null; ps = ps.next) {
adamc@974:           var r = execP(env, ps.data.p, v);
adamc@974:           if (r != false) {
adamc@983:             saveEnv();
adamc@974:             env = r;
adamc@974:             e = ps.data.b;
adamc@974:             break;
adamc@974:           }
adamc@974:         }
adamc@974:         if (ps == null)
adamc@982:           whine("Match failure in Ur interpretation");
adamc@974:         break;
adamc@970:       default:
adamc@982:         whine("Unknown Ur continuation kind " + fr.c);
adamc@970:       }
adamc@970: 
adamc@970:       break;
adamc@970:     case "v":
adamc@970:       e = {c: "c", v: lookup(env, e.n)};
adamc@970:       break;
adamc@970:     case "n":
adamc@971:       e = urfuncs[e.n];
adamc@970:       break;
adamc@970:     case "s":
adamc@970:       stack = cons({c: "s"}, stack);
adamc@970:       e = e.v;
adamc@970:       break;
adamc@970:     case "1":
adamc@970:       stack = cons({c: "1", n: e.n}, stack);
adamc@970:       e = e.v;
adamc@970:       break;
adamc@970:     case "f":
adamc@970:       if (e.a == null)
adamc@970:         e = {c: "c", v: e.f()};
adamc@970:       else {
adamc@970:         var args = [];
adamc@970:         stack = cons({c: "f", f: e.f, args: args, pos: 0, a: e.a.next}, stack);
adamc@982:         if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@970:         e = e.a.data;
adamc@970:       }
adamc@970:       break;
adamc@970:     case "l":
adamc@970:       e = {c: "c", v: {env: env, body: e.b}};
adamc@970:       break;
adamc@970:     case "a":
adamc@970:       stack = cons({c: "a1", x: e.x}, stack);
adamc@970:       e = e.f;
adamc@970:       break;
adamc@970:     case "r":
adamc@970:       if (e.l == null)
adamc@982:         whine("Empty Ur record in interpretation");
adamc@970:       var fs = {};
adamc@970:       stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@973:       e = e.l.data.v;
adamc@970:       break;
adamc@970:     case ".":
adamc@970:       stack = cons({c: ".", f: e.f}, stack);
adamc@970:       e = e.r;
adamc@970:       break;
adamc@970:     case ";":
adamc@970:       stack = cons({c: ";", e2: e.e2}, stack);
adamc@970:       e = e.e1;
adamc@970:       break;
adamc@970:     case "=":
adamc@970:       stack = cons({c: "=", e2: e.e2}, stack);
adamc@970:       e = e.e1;
adamc@970:       break;
adamc@974:     case "m":
adamc@974:       stack = cons({c: "m", p: e.p}, stack);
adamc@974:       e = e.e;
adamc@974:       break;
adamc@970:     case "e":
adamc@975:       e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@975:       break;
adamc@975:     case "wc":
adamc@975:       env = e.env;
adamc@975:       e = e.body;
adamc@970:       break;
adamc@1020:     case "K":
adamc@1020:       { var savedStack = stack.next, savedEnv = env;
adamc@1020:       e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1020:       usedK = true;
adamc@1020:       break;      
adamc@970:     default:
adamc@982:       whine("Unknown Ur expression kind " + e.c);
adamc@970:     }
adamc@970:   }
adamc@970: }
adamc@970: 
adamc@976: function execD(e) {
adamc@976:   return exec0(null, e);
adamc@976: }
adamc@976: 
adamc@970: function exec(e) {
adamc@970:   var r = exec0(null, e);
adamc@970: 
adamc@975:   if (r != null && r.body != null)
adamc@970:     return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@970:   else
adamc@970:     return r;
adamc@895: }
adamc@895: 
adamc@977: function execF(f, x) {
adamc@977:   return exec0(cons(x, f.env), f.body);
adamc@977: }
adamc@977: 
adamc@895: 
adamc@693: // App-specific code
adamc@693: