adamc@1036: // Detect browser quirks that we should be aware of.
adamc@1036:
adamc@1036: function needsDynPrefix() {
adamc@1260: var span = document.createElement("span");
adamc@1260: span.innerHTML = "";
adamc@1260: var scripts = span.getElementsByTagName("script");
adamc@1260: return scripts.length == 0;
adamc@1036: }
adamc@1036:
adamc@1036: var dynPrefix = needsDynPrefix() ? "A" : "";
adamc@1036:
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; }
adam@1360: function divInt(x, y) { var n = x / y; return n < 0 ? Math.ceil(n) : Math.floor(n); }
adamc@970: function mod(x, y) { return x % y; }
adam@1360: function modInt(x, y) { var n = x % y; return n < 0 ? Math.ceil(n) : Math.floor(n); }
adamc@970: function lt(x, y) { return x < y; }
adamc@970: function le(x, y) { return x <= y; }
adamc@970:
adamc@1061: // Characters
adamc@1061:
adamc@1061: function isLower(c) { return c >= 'a' && c <= 'z'; }
adamc@1061: function isUpper(c) { return c >= 'A' && c <= 'Z'; }
adamc@1061: function isAlpha(c) { return isLower(c) || isUpper(c); }
adamc@1061: function isDigit(c) { return c >= '0' && c <= '9'; }
adamc@1061: function isAlnum(c) { return isAlpha(c) || isDigit(c); }
adamc@1061: function isBlank(c) { return c == ' ' || c == '\t'; }
adamc@1061: function isSpace(c) { return isBlank(c) || c == '\r' || c == '\n'; }
adamc@1061: function isXdigit(c) { return isDigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); }
adamc@1177: function toLower(c) { return c.toLowerCase(); }
adamc@1177: function toUpper(c) { return c.toUpperCase(); }
adamc@1061:
adamc@1061:
adamc@692: // Lists
adamc@692:
adamc@580: function cons(v, ls) {
adamc@1260: return { next : ls, data : v };
adamc@690: }
adamc@969: function rev(ls) {
adamc@1260: var acc = null;
adamc@1260: for (; ls; ls = ls.next)
adamc@1260: acc = cons(ls.data, acc);
adamc@1260: return acc;
adamc@969: }
adamc@690: function concat(ls1, ls2) {
adamc@1260: var acc = ls2;
adamc@1260: ls1 = rev(ls1);
adamc@1260: for (; ls1; ls1 = ls1.next)
adamc@1260: acc = cons(ls1.data, acc);
adamc@1260: return acc;
adamc@690: }
adamc@690: function member(x, ls) {
adamc@1260: for (; ls; ls = ls.next)
adamc@1260: if (ls.data == x)
adamc@1260: return true;
adamc@1260: return false;
adamc@690: }
adamc@690: function remove(x, ls) {
adamc@1260: var acc = null;
adamc@969:
adamc@1260: for (; ls; ls = ls.next)
adamc@1260: if (ls.data == x)
adamc@1260: return concat(acc, ls.next);
adamc@1260: else
adamc@1260: acc = cons(ls.data, acc);
adamc@969:
adamc@1260: return ls;
adamc@690: }
adamc@690: function union(ls1, ls2) {
adamc@1260: var acc = ls2;
adamc@969:
adamc@1260: for (; ls1; ls1 = ls1.next)
adamc@1260: if (!member(ls1.data, ls2))
adamc@1260: acc = cons(ls1.data, acc);
adamc@969:
adamc@1260: return acc;
adamc@580: }
adamc@703: function length(ls) {
adamc@1260: var acc = 0;
adamc@969:
adamc@1260: for (; ls; ls = ls.next)
adamc@1260: ++acc;
adamc@969:
adamc@1260: return acc;
adamc@703: }
adamc@670:
adamc@690:
adamc@729: // Error handling
adamc@729:
adamc@729: function whine(msg) {
adamc@1260: alert(msg);
adamc@1260: throw msg;
adamc@729: }
adamc@729:
adamc@810: function pf(loc) {
adamc@1260: throw ("Pattern match failure (" + loc + ")");
adamc@729: }
adamc@729:
adamc@798: function runHandlers(kind, ls, arg) {
adamc@1260: if (ls == null)
adamc@1260: alert(kind + ": " + arg);
adamc@1260: for (; ls; ls = ls.next)
adamc@1260: try {
adamc@1260: exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adamc@1260: } catch (v) { }
adamc@729: }
adamc@729:
adamc@729: var errorHandlers = null;
adamc@729:
adamc@729: function onError(f) {
adamc@1260: errorHandlers = cons(f, errorHandlers);
adamc@729: }
adamc@729:
adamc@729: function er(s) {
adamc@1260: runHandlers("Error", errorHandlers, s);
adamc@1260: throw {uw_error: s};
adamc@729: }
adamc@729:
adamc@729: var failHandlers = null;
adamc@729:
adamc@729: function onFail(f) {
adamc@1260: failHandlers = cons(f, failHandlers);
adamc@729: }
adamc@729:
adamc@729: function doExn(v) {
adamc@1260: if (v == null || v.uw_error == null) {
adamc@1260: var s = (v == null ? "null" : v.message ? v.message : v.toString());
adamc@1260: if (v != null && v.fileName && v.lineNumber)
adamc@1260: s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@1260: runHandlers("Fail", failHandlers, s);
adamc@1260: }
adamc@729: }
adamc@729:
adamc@729: var disconnectHandlers = null;
adamc@729:
adamc@976: function flift(f) {
adamc@1260: return {env:cons(f,null), body:{c:"v", n:1}};
adamc@976: }
adamc@976:
adamc@729: function onDisconnect(f) {
adamc@1260: disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729: }
adamc@729:
adamc@729: function discon() {
adamc@1260: runHandlers("Disconnect", disconnectHandlers, null);
adamc@729: }
adamc@729:
adamc@729: var connectHandlers = null;
adamc@729:
adamc@729: function onConnectFail(f) {
adamc@1260: connectHandlers = cons(flift(f), connectHandlers);
adamc@729: }
adamc@729:
adamc@729: function conn() {
adamc@1260: runHandlers("Connect", connectHandlers, null);
adamc@729: }
adamc@729:
adamc@729: var serverHandlers = null;
adamc@729:
adamc@729: function onServerError(f) {
adamc@1260: serverHandlers = cons(f, serverHandlers);
adamc@729: }
adamc@729:
adamc@729: function servErr(s) {
adamc@1260: 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@1260: return {closure: f};
adamc@693: }
adamc@693:
adamc@693: function isWeird(v) {
adamc@1260: return v.closure != null || v.cat1 != null;
adamc@693: }
adamc@693:
adamc@692: function cat(s1, s2) {
adamc@1260: if (isWeird(s1) || isWeird(s2))
adamc@1260: return {cat1: s1, cat2: s2};
adamc@1260: else
adamc@1260: return s1 + s2;
adamc@692: }
adamc@692:
adamc@692: var closures = [];
adamc@703: var freeClosures = null;
adamc@692:
adamc@692: function newClosure(f) {
adamc@1260: var n;
adamc@1260: if (freeClosures == null) {
adamc@1260: n = closures.length;
adamc@1260: } else {
adamc@1260: n = freeClosures.data;
adamc@1260: freeClosures = freeClosures.next;
adamc@1260: }
adamc@1260: closures[n] = f;
adamc@1260: return n;
adamc@692: }
adamc@692:
adamc@703: function freeClosure(n) {
adamc@1260: closures[n] = null;
adamc@1260: freeClosures = cons(n, freeClosures);
adamc@703: }
adamc@703:
adamc@692: function cr(n) {
adamc@1260: return closures[n];
adamc@692: }
adamc@692:
adamc@703: function flatten(cls, tr) {
adamc@1260: if (tr.cat1 != null)
adamc@1260: return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@1260: else if (tr.closure != null) {
adamc@1260: var cl = newClosure(tr.closure);
adamc@1260: cls.v = cons(cl, cls.v);
adamc@1260: return "cr(" + cl + ")";
adamc@1260: } else
adamc@1260: return tr;
adamc@692: }
adamc@692:
adamc@728: function flattenLocal(s) {
adamc@1260: var cls = {v : null};
adamc@1260: var r = flatten(cls, s);
adamc@1260: for (cl = cls.v; cl != null; cl = cl.next)
adamc@1260: freeClosure(cl.data);
adamc@1260: return r;
adamc@728: }
adamc@728:
adamc@692:
adamc@692:
adamc@692: // Dynamic tree management
adamc@692:
adamc@690: function populate(node) {
adamc@1260: var s = node.signal;
adamc@1260: var oldSources = node.sources;
adamc@1260: try {
adamc@1260: var sr = execF(s, null);
adamc@1260: var newSources = sr._sources;
adamc@690:
adamc@1260: for (var sp = oldSources; sp; sp = sp.next)
adamc@1260: if (!member(sp.data, newSources))
adamc@1260: sp.data.dyns = remove(node, sp.data.dyns);
adamc@690:
adamc@1260: for (var sp = newSources; sp; sp = sp.next)
adamc@1260: if (!member(sp.data, oldSources))
adamc@1260: sp.data.dyns = cons(node, sp.data.dyns);
adamc@690:
adamc@1260: node.sources = newSources;
adamc@1260: node.recreate(sr._data);
adamc@1260: } catch (v) {
adamc@1260: doExn(v);
adamc@1260: }
adamc@579: }
adamc@574:
adamc@580: function sc(v) {
adamc@1260: return {data : v, dyns : null};
adamc@580: }
adamc@580: function sv(s, v) {
adamc@1260: s.data = v;
adamc@967:
adamc@1260: for (var ls = s.dyns; ls; ls = ls.next)
adamc@1260: if (!ls.dead)
adamc@1260: populate(ls.data);
adamc@580: }
adamc@601: function sg(s) {
adamc@1260: return s.data;
adamc@601: }
adamc@579:
adamc@580: function ss(s) {
adamc@1260: return {env:cons(s, null), body:{c:"r", l:
adamc@1260: cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@1260: cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580: }
adamc@580: function sr(v) {
adamc@1260: return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580: }
adamc@580: function sb(x,y) {
adamc@1260: return {env:cons(y,cons(x,null)),
adamc@1260: body:{c:"=",
adamc@1260: e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@1260: e2:{c:"=",
adamc@1260: e1:{c:"a",
adamc@1260: f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@1260: x:{c:"c", v:null}},
adamc@1260: e2:{c:"r", l:cons(
adamc@1260: {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@1260: cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@1260: cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580: }
adamc@841: function scur(s) {
adamc@1260: return execF(s, null)._data;
adamc@841: }
adamc@571:
adamc@604: function lastParent() {
adamc@1260: var pos = document.body;
adamc@604:
adamc@1260: while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@1260: pos = pos.lastChild;
adamc@600:
adamc@1260: pos = pos.parentNode;
adamc@1039:
adamc@1260: return pos;
adamc@600: }
adamc@600:
adamc@898: function parent() {
adamc@1260: return thisScript ? thisScript.parentNode : lastParent();
adamc@898: }
adamc@898:
adamc@604: function addNode(node) {
adamc@1260: if (thisScript)
adamc@1260: thisScript.parentNode.replaceChild(node, thisScript);
adamc@1260: else
adamc@1260: lastParent().appendChild(node);
adamc@603: }
adamc@603:
adamc@690: var thisScript = null;
adamc@690:
adamc@604: function runScripts(node) {
adamc@1260: if (node.getElementsByTagName) {
adamc@1260: var savedScript = thisScript;
adamc@603:
adamc@1260: var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@1260: var len = scripts.length;
adamc@1260: for (var i = 0; i < len; ++i)
adamc@1260: scriptsCopy[i] = scripts[i];
adamc@1260: for (var i = 0; i < len; ++i) {
adamc@1260: thisScript = scriptsCopy[i];
adamc@1039:
adamc@1260: try {
adamc@1260: eval(thisScript.text);
adamc@1260: } catch (v) {
adamc@1260: doExn(v);
adamc@1260: }
adamc@1260: if (thisScript.parentNode)
adamc@1260: thisScript.parentNode.removeChild(thisScript);
adamc@1260: }
adamc@1260:
adamc@1260: thisScript = savedScript;
adamc@729: }
adamc@603: }
adamc@603:
adamc@603:
adamc@692: // Dynamic tree entry points
adamc@692:
adamc@967: function killScript(scr) {
adamc@1260: scr.dead = true;
adamc@1260: for (var ls = scr.sources; ls; ls = ls.next)
adamc@1260: ls.data.dyns = remove(scr, ls.data.dyns);
adamc@1260: for (var ls = scr.closures; ls; ls = ls.next)
adamc@1260: freeClosure(ls.data);
adamc@967: }
adamc@967:
adamc@901: function dyn(pnode, s) {
adamc@1260: var x = document.createElement("script");
adamc@1260: x.dead = false;
adamc@1260: x.signal = s;
adamc@1260: x.sources = null;
adamc@1260: x.closures = null;
adamc@899:
adamc@1260: var firstChild = null;
adamc@899:
adamc@1260: x.recreate = function(v) {
adamc@1260: for (var ls = x.closures; ls; ls = ls.next)
adamc@1260: freeClosure(ls.data);
adamc@945:
adamc@946: var next;
adamc@1260: for (var child = firstChild; child && child != x; child = next) {
adamc@1260: next = child.nextSibling;
adamc@1260:
adamc@1260: killScript(child);
adamc@1260: if (child.getElementsByTagName) {
adamc@1260: var arr = child.getElementsByTagName("script");
adamc@1260: for (var i = 0; i < arr.length; ++i)
adamc@1260: killScript(arr[i]);
adamc@1260: }
adamc@1260:
adamc@1260: if (child.parentNode)
adamc@1260: child.parentNode.removeChild(child);
adamc@946: }
adamc@903:
adamc@1260: var cls = {v : null};
adamc@1260: var html = flatten(cls, v);
adamc@1260: if (pnode != "table" && pnode != "tr")
adamc@1260: html = dynPrefix + html;
adamc@1260: x.closures = cls.v;
adamc@946:
adamc@1260: if (pnode == "table") {
adamc@1260: var dummy = document.createElement("body");
adamc@1260: dummy.innerHTML = "
";
adamc@1260: runScripts(dummy);
adamc@1260: var table = x.parentNode;
adamc@1260:
adamc@1260: if (table) {
adamc@1260: firstChild = null;
adamc@1260: var tbody;
adamc@1260:
adamc@1260: var arr = dummy.getElementsByTagName("tbody");
adamc@1260:
adamc@1260: var tbody;
adamc@1260: if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@1260: tbody = arr[0];
adamc@1260: var next;
adamc@1260: for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1260: next = node.nextSibling;
adamc@1260:
adamc@1260: if (node.tagName != "TBODY")
adamc@1260: tbody.appendChild(node);
adamc@1260: }
adamc@1260: } else
adamc@1260: tbody = dummy.firstChild;
adamc@1260:
adamc@1260: var next;
adamc@1260: firstChild = document.createElement("script");
adamc@1260: table.insertBefore(firstChild, x);
adamc@1260: for (var node = tbody.firstChild; node; node = next) {
adamc@1260: next = node.nextSibling;
adamc@1260: table.insertBefore(node, x);
adamc@1260: }
adamc@1260: }
adamc@1260: } else if (pnode == "tr") {
adamc@1260: var dummy = document.createElement("body");
adamc@1260: dummy.innerHTML = "";
adamc@1260: runScripts(dummy);
adamc@1260: var table = x.parentNode;
adamc@1260:
adamc@1260: if (table) {
adamc@1260: var arr = dummy.getElementsByTagName("tr");
adamc@1260: firstChild = null;
adamc@1260: var tr;
adamc@1260: if (arr.length > 0 && table != null)
adamc@1260: tr = arr[0];
adamc@1260: else
adamc@1260: tr = dummy.firstChild;
adamc@1260:
adamc@1260: var next;
adamc@1260: firstChild = document.createElement("script");
adamc@1260: table.insertBefore(firstChild, x);
adamc@1260: for (var node = tr.firstChild; node; node = next) {
adamc@1260: next = node.nextSibling;
adamc@1260: table.insertBefore(node, x);
adamc@1260: }
adamc@1260: }
adamc@1260: } else {
adamc@1260: firstChild = document.createElement("span");
adamc@1260: firstChild.innerHTML = html;
adamc@1260: runScripts(firstChild);
adamc@1260: if (x.parentNode)
adamc@1260: x.parentNode.insertBefore(firstChild, x);
adamc@903: }
adamc@1260: };
adamc@899:
adamc@1260: addNode(x);
adamc@1260: populate(x);
adamc@571: }
adamc@582:
adamc@1040: function input(x, s, recreate, type) {
adamc@1260: if (type) x.type = type;
adamc@1260: x.dead = false;
adamc@1260: x.signal = ss(s);
adamc@1260: x.sources = null;
adamc@1260: x.recreate = recreate(x);
adamc@1260: addNode(x);
adamc@1260: populate(x);
adamc@816:
adamc@1260: return x;
adamc@816: }
adamc@816:
adamc@816: function inp(s) {
adamc@1260: var x = input(document.createElement("input"), s,
adamc@1260: function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@1260: x.value = s.data;
adamc@1260: x.onkeyup = function() { sv(s, x.value) };
adamc@816:
adamc@1260: return x;
adamc@816: }
adamc@816:
adamc@816: function sel(s, content) {
adamc@1260: var dummy = document.createElement("span");
adamc@1260: dummy.innerHTML = "";
adamc@1260: var x = input(dummy.firstChild, s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@1260: x.value = s.data;
adamc@1260: if (x.value != s.data)
adamc@1260: sv(s, x.value);
adamc@1260: x.onchange = function() { sv(s, x.value) };
adamc@797:
adamc@1260: return x;
adamc@598: }
adamc@598:
adamc@817: function chk(s) {
adamc@1260: var x = input(document.createElement("input"), s,
adamc@1260: function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@1260: x.defaultChecked = x.checked = s.data;
adamc@1260: x.onclick = function() { sv(s, x.checked) };
adamc@817:
adamc@1260: return x;
adamc@817: }
adamc@817:
adamc@1099: function tbx(s) {
adamc@1260: var x = input(document.createElement("textarea"), s,
adamc@1260: function(x) { return function(v) { if (x.innerHTML != v) x.innerHTML = v; }; });
adamc@1260: x.innerHTML = s.data;
adamc@1260: x.onkeyup = function() { sv(s, x.value) };
adamc@1099:
adamc@1260: return x;
adamc@1099: }
adamc@1099:
adamc@800: function addOnChange(x, f) {
adamc@1260: var old = x.onchange;
adam@1290: if (old == null)
adam@1290: x.onchange = f;
adam@1290: else
adam@1290: x.onchange = function() { old(); f(); };
adam@1290: }
adam@1290:
adam@1290: function addOnKeyUp(x, f) {
adam@1290: var old = x.onkeyup;
adam@1290: if (old == null)
adam@1290: x.onkeyup = f;
adam@1290: else
adam@1290: x.onkeyup = function(x) { old(x); f(x); };
adamc@800: }
adamc@800:
adamc@692:
adamc@692: // Basic string operations
adamc@692:
adamc@597: function eh(x) {
adamc@1260: if (x == null)
adamc@1260: return "NULL";
adamc@1260: else
adamc@1260: return x.split("&").join("&").split("<").join("<").split(">").join(">");
adamc@597: }
adamc@597:
adamc@582: function ts(x) { return x.toString() }
adamc@586: function bs(b) { return (b ? "True" : "False") }
adamc@586:
adamc@1057: function id(x) { return x; }
adamc@1038: function sub(s, i) { return s.charAt(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@1260: var r = s.indexOf(ch);
adamc@1260: if (r == -1)
adamc@1260: return null;
adamc@1260: else
adamc@1260: return r;
adamc@829: }
adamc@831: function sspn(s, chs) {
adamc@1260: for (var i = 0; i < s.length; ++i)
adamc@1260: if (chs.indexOf(s.charAt(i)) != -1)
adamc@1260: return i;
adamc@831:
adamc@1260: return null;
adamc@831: }
adamc@829: function schr(s, ch) {
adamc@1260: var r = s.indexOf(ch);
adamc@1260: if (r == -1)
adamc@1260: return null;
adamc@1260: else
adamc@1260: return s.substring(r);
adamc@829: }
adamc@829: function ssub(s, start, len) {
adamc@1260: return s.substring(start, start+len);
adamc@829: }
adamc@821:
adamc@649: function pi(s) {
adamc@1260: var r = parseInt(s);
adamc@1260: if (r.toString() == s)
adamc@1260: return r;
adamc@1260: else
adamc@1260: er("Can't parse int: " + s);
adamc@649: }
adamc@649:
adamc@649: function pfl(s) {
adamc@1260: var r = parseFloat(s);
adamc@1260: if (r.toString() == s)
adamc@1260: return r;
adamc@1260: else
adamc@1260: er("Can't parse float: " + s);
adamc@649: }
adamc@649:
adamc@838: function pio(s) {
adamc@1260: var r = parseInt(s);
adamc@1260: if (r.toString() == s)
adamc@1260: return r;
adamc@1260: else
adamc@1260: return null;
adamc@838: }
adamc@838:
adamc@838: function pflo(s) {
adamc@1260: var r = parseFloat(s);
adamc@1260: if (r.toString() == s)
adamc@1260: return r;
adamc@1260: else
adamc@1260: return null;
adamc@838: }
adamc@838:
adamc@692: function uf(s) {
adamc@1260: if (s.length == 0)
adamc@1260: return "_";
adamc@1260: s = s.replace(new RegExp ("\\.", "g"), ".2E");
adamc@1260: return (s.charAt(0) == '_' ? "_" : "") + encodeURIComponent(s).replace(new RegExp ("%", "g"), ".");
adamc@691: }
adamc@691:
adamc@692: function uu(s) {
adamc@1260: if (s.length > 0 && s.charAt(0) == '_') {
adamc@1260: s = s.substring(1);
adamc@1260: } else if (s.length >= 3 && (s.charAt(0) == '%' || s.charAt(0) == '.')
adamc@1260: && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@1260: s = s.substring(3);
adamc@1260: s = s.replace(new RegExp ("\\+", "g"), " ");
adamc@1260: s = s.replace(new RegExp ("\\.", "g"), "%");
adamc@1260: return decodeURIComponent(s);
adamc@905: }
adamc@905:
adamc@1108: function atr(s) {
adamc@1260: return s.replace(new RegExp ("\"", "g"), """).replace(new RegExp ("&", "g"), "&")
adamc@1260: }
adamc@1108:
adamc@912: function ub(b) {
adamc@1260: return b ? "1" : "0";
adamc@912: }
adamc@912:
adamc@905: function uul(getToken, getData) {
adamc@1260: var tok = getToken();
adamc@1260: if (tok == "Nil") {
adamc@1260: return null;
adamc@1260: } else if (tok == "Cons") {
adamc@1260: var d = getData();
adamc@1260: var l = uul(getToken, getData);
adamc@1260: return {_1:d, _2:l};
adamc@1260: } else
adamc@1260: whine("Can't unmarshal list (" + tok + ")");
adamc@692: }
adamc@692:
adamc@961: function strcmp(str1, str2) {
adamc@1260: 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@1260: return new XMLHttpRequest();
adamc@609: } catch (e) {
adamc@1260: try {
adamc@1260: return new ActiveXObject("Msxml2.XMLHTTP");
adamc@1260: } catch (e) {
adamc@1260: try {
adamc@1260: return new ActiveXObject("Microsoft.XMLHTTP");
adamc@1260: } catch (e) {
adamc@1260: whine("Your browser doesn't seem to support AJAX.");
adamc@1260: }
adamc@1260: }
adamc@609: }
adamc@609: }
adamc@609:
adamc@736: var sig = null;
adamc@736:
adamc@1042: var unloading = false, inFlight = null;
adamc@1042:
adamc@1042: function unload() {
adamc@1260: unloading = true;
adamc@1042:
adamc@1260: for (; inFlight; inFlight = inFlight.next) {
adamc@1260: inFlight.data.abort();
adamc@1260: }
adamc@1042: }
adamc@1042:
adamc@736: function requestUri(xhr, uri, needsSig) {
adamc@1260: if (unloading)
adamc@1260: return;
adamc@1042:
adamc@1260: xhr.open("POST", uri, true);
adamc@1260: xhr.setRequestHeader("Content-type", "text/plain");
adamc@1260: xhr.setRequestHeader("Content-length", "0");
adamc@1260: xhr.setRequestHeader("Connection", "close");
adamc@668:
adamc@1260: if (client_id != null) {
adamc@1260: xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@1260: xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@1260: }
adamc@668:
adamc@1260: if (needsSig) {
adamc@1260: if (sig == null)
adamc@1260: whine("Missing cookie signature!");
adamc@736:
adamc@1260: xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@1260: }
adamc@736:
adamc@1260: inFlight = cons(xhr, inFlight);
adamc@1260: xhr.send(null);
adamc@668: }
adamc@668:
adamc@1042: function xhrFinished(xhr) {
adamc@1260: xhr.abort();
adamc@1260: inFlight = remove(xhr, inFlight);
adamc@1042: }
adamc@1042:
adamc@1111: function unurlify(parse, s) {
adamc@1260: return parse(s);
adamc@1111: }
adamc@1111:
adam@1385: function redirect(s) {
adam@1385: window.location = s;
adam@1385: }
adam@1385:
adamc@978: function rc(prefix, uri, parse, k, needsSig) {
adamc@1260: uri = cat(prefix, uri);
adamc@1260: uri = flattenLocal(uri);
adamc@1260: var xhr = getXHR();
adamc@609:
adamc@1260: xhr.onreadystatechange = function() {
adamc@1260: if (xhr.readyState == 4) {
adamc@1260: var isok = false;
adamc@612:
adamc@1260: try {
adamc@1260: if (xhr.status == 200)
adamc@1260: isok = true;
adamc@1260: } catch (e) { }
adamc@612:
adamc@1260: if (isok) {
adam@1446: var lines = xhr.responseText.split("\n");
adam@1446: if (lines.length != 2)
adam@1446: whine("Bad RPC response lines");
adam@1446:
adam@1446: eval(lines[0]);
adam@1446:
adamc@1260: try {
adam@1446: k(parse(lines[1]));
adamc@1260: } catch (v) {
adamc@1260: doExn(v);
adamc@1260: }
adamc@1260: } else {
adamc@1260: conn();
adamc@1260: }
adamc@1260:
adamc@1260: xhrFinished(xhr);
adamc@729: }
adamc@1260: };
adamc@1042:
adamc@1260: requestUri(xhr, uri, needsSig);
adamc@609: }
adamc@667:
adamc@667: function path_join(s1, s2) {
adamc@1260: if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@1260: return s1 + s2;
adamc@1260: else
adamc@1260: return s1 + "/" + s2;
adamc@667: }
adamc@667:
adamc@670: var channels = [];
adamc@670:
adamc@670: function newQueue() {
adamc@1260: return { front : null, back : null };
adamc@670: }
adamc@670: function enqueue(q, v) {
adamc@1260: if (q.front == null) {
adamc@1260: q.front = cons(v, null);
adamc@1260: q.back = q.front;
adamc@1260: } else {
adamc@1260: var node = cons(v, null);
adamc@1260: q.back.next = node;
adamc@1260: q.back = node;
adamc@1260: }
adamc@670: }
adamc@670: function dequeue(q) {
adamc@670: if (q.front == null)
adamc@1260: return null;
adamc@1260: else {
adamc@1260: var r = q.front.data;
adamc@1260: q.front = q.front.next;
adamc@1260: if (q.front == null)
adamc@1260: q.back = null;
adamc@1260: return r;
adamc@1260: }
adamc@670: }
adamc@670:
adamc@670: function newChannel() {
adamc@1260: return { msgs : newQueue(), listeners : newQueue() };
adamc@670: }
adamc@670:
adamc@667: function listener() {
adamc@1260: var uri = path_join(url_prefix, ".msgs");
adamc@1260: var xhr = getXHR();
adamc@1260: var tid, orsc, onTimeout;
adamc@673:
adamc@1260: var connect = function () {
adamc@1260: xhr.onreadystatechange = orsc;
adamc@1260: tid = window.setTimeout(onTimeout, timeout * 500);
adamc@1260: requestUri(xhr, uri, false);
adamc@1260: }
adamc@673:
adamc@1260: orsc = function() {
adamc@1260: if (xhr.readyState == 4) {
adamc@1260: window.clearTimeout(tid);
adamc@673:
adamc@1260: var isok = false;
adamc@667:
adamc@1260: try {
adamc@1260: if (xhr.status == 200)
adamc@1260: isok = true;
adamc@1260: } catch (e) { }
adamc@667:
adamc@1260: if (isok) {
adam@1447: var text = xhr.responseText;
adamc@1260: if (text == "")
adamc@1260: return;
adamc@1260: var lines = text.split("\n");
adamc@889:
adamc@1260: if (lines.length < 2) {
adamc@1260: discon();
adamc@1260: return;
adamc@1260: }
adamc@1260:
adam@1447: var messageReader = function(i) {
adam@1447: if (i+1 >= lines.length) {
adam@1447: xhrFinished(xhr);
adam@1447: connect();
adam@1447: }
adam@1447: else {
adam@1447: var chn = lines[i];
adam@1447: var msg = lines[i+1];
adamc@1260:
adam@1447: if (chn == "E") {
adam@1447: eval(msg);
adam@1447: window.setTimeout(function() { messageReader(i+2); }, 0);
adam@1447: } else {
adam@1447: if (chn < 0)
adam@1447: whine("Out-of-bounds channel in message from remote server");
adamc@1260:
adam@1447: var ch;
adamc@1260:
adam@1447: if (chn >= channels.length || channels[chn] == null) {
adam@1447: ch = newChannel();
adam@1447: channels[chn] = ch;
adam@1447: } else
adam@1447: ch = channels[chn];
adamc@1260:
adam@1447: var listener = dequeue(ch.listeners);
adam@1447: if (listener == null) {
adam@1447: enqueue(ch.msgs, msg);
adam@1447: } else {
adam@1447: try {
adam@1447: listener(msg);
adam@1447: } catch (v) {
adam@1447: doExn(v);
adam@1447: }
adam@1447: }
adam@1447:
adam@1447: messageReader(i+2);
adamc@1260: }
adamc@1260: }
adamc@1260: }
adamc@1260:
adam@1447: messageReader(0);
adamc@1260: }
adamc@1260: else {
adamc@1260: try {
adamc@1260: if (xhr.status != 0)
adamc@1260: servErr("Error querying remote server for messages: " + xhr.status);
adamc@1260: } catch (e) { }
adamc@1260: }
adamc@729: }
adamc@1260: };
adamc@669:
adamc@1260: onTimeout = function() {
adamc@1260: xhrFinished(xhr);
adamc@1260: connect();
adamc@1260: };
adamc@670:
adamc@673: connect();
adamc@667: }
adamc@670:
adamc@670: function rv(chn, parse, k) {
adamc@1260: if (chn == null)
adamc@1260: return;
adamc@682:
adamc@1260: if (chn < 0)
adamc@1260: whine("Out-of-bounds channel receive");
adamc@670:
adamc@1260: var ch;
adamc@670:
adamc@1260: if (chn >= channels.length || channels[chn] == null) {
adamc@1260: ch = newChannel();
adamc@1260: channels[chn] = ch;
adamc@1260: } else
adamc@1260: ch = channels[chn];
adamc@670:
adamc@1260: var msg = dequeue(ch.msgs);
adamc@1260: if (msg == null) {
adamc@1260: enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@1260: } else {
adamc@1260: try {
adamc@1260: k(parse(msg));
adamc@1260: } catch (v) {
adamc@1260: doExn(v);
adamc@1260: }
adamc@728: }
adamc@670: }
adamc@693:
adamc@978: function sl(ms, k) {
adamc@1260: window.setTimeout(function() { k(null); }, ms);
adamc@1021: }
adamc@1021:
adamc@1021: function sp(e) {
adamc@1260: 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() {
adam@1290: return window.event ? event.keyCode : (uw_event ? uw_event.keyCode : 0);
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@1260: while (env != null) {
adamc@1260: if (n == 0)
adamc@1260: return env.data;
adamc@1260: else {
adamc@1260: --n;
adamc@1260: env = env.next;
adamc@1260: }
adamc@970: }
adamc@970:
adamc@1260: whine("Out-of-bounds Ur variable reference");
adamc@970: }
adamc@970:
adamc@974: function execP(env, p, v) {
adamc@1260: switch (p.c) {
adamc@1260: case "w":
adamc@1260: return env;
adamc@1260: case "v":
adamc@1260: return cons(v, env);
adamc@1260: case "c":
adamc@1260: if (v == p.v)
adamc@1260: return env;
adamc@1260: else
adamc@1260: return false;
adamc@1260: case "s":
adamc@1260: if (v == null)
adamc@1260: return false;
adamc@1260: else
adamc@1260: return execP(env, p.p, p.n ? v.v : v);
adamc@1260: case "1":
adamc@1260: if (v.n != p.n)
adamc@1260: return false;
adamc@1260: else
adamc@1260: return execP(env, p.p, v.v);
adamc@1260: case "r":
adamc@1260: for (var fs = p.l; fs != null; fs = fs.next) {
adamc@1260: env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@1260: if (env == false)
adamc@1260: return false;
adamc@1260: }
adamc@1260: return env;
adamc@1260: default:
adamc@1260: whine("Unknown Ur pattern kind" + p.c);
adamc@974: }
adamc@974: }
adamc@974:
adamc@970: function exec0(env, e) {
adamc@1260: return exec1(env, null, e);
adamc@1020: }
adamc@1020:
adamc@1020: function exec1(env, stack, e) {
adamc@1260: var stack, usedK = false;
adamc@970:
adamc@1260: var saveEnv = function() {
adamc@1260: if (stack.next != null && stack.next.data.c != "<")
adamc@1260: stack = cons({c: "<", env: env}, stack.next);
adamc@1260: else
adamc@1260: stack = stack.next;
adamc@1260: };
adamc@983:
adamc@1260: while (true) {
adamc@1260: switch (e.c) {
adamc@1260: case "c":
adamc@1260: var v = e.v;
adamc@1260: if (stack == null)
adamc@1260: return v;
adamc@1260: var fr = stack.data;
adamc@970:
adamc@1260: switch (fr.c) {
adamc@1260: case "s":
adamc@1260: e = {c: "c", v: {v: v}};
adamc@1260: stack = stack.next;
adamc@1260: break;
adamc@1260: case "1":
adamc@1260: e = {c: "c", v: {n: fr.n, v: v}};
adamc@1260: stack = stack.next;
adamc@1260: break;
adamc@1260: case "f":
adamc@1260: fr.args[fr.pos++] = v;
adamc@1260: if (fr.a == null) {
adamc@1260: var res;
adamc@1260: stack = stack.next;
adamc@1035:
adamc@1260: if (fr.f.apply)
adamc@1260: res = fr.f.apply(null, fr.args);
adamc@1260: else if (fr.args.length == 0)
adamc@1260: res = fr.f();
adamc@1260: else if (fr.args.length == 1)
adamc@1260: res = fr.f(fr.args[0]);
adamc@1260: else if (fr.args.length == 2)
adamc@1260: res = fr.f(fr.args[0], fr.args[1]);
adamc@1260: else if (fr.args.length == 3)
adamc@1260: res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1260: else if (fr.args.length == 4)
adamc@1260: res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1260: else if (fr.args.length == 5)
adamc@1260: res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1260: else
adamc@1260: whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035:
adamc@1260: e = {c: "c", v: res};
adamc@1260: if (usedK) return null;
adamc@1260: } else {
adamc@1260: e = fr.a.data;
adamc@1260: fr.a = fr.a.next;
adamc@1260: }
adamc@1260: break;
adamc@1260: case "a1":
adamc@1260: e = fr.x;
adamc@1260: stack = cons({c: "a2", f: v}, stack.next);
adamc@1260: break;
adamc@1260: case "a2":
adamc@1260: if (fr.f == null)
adamc@1260: whine("Ur: applying null function");
adamc@1260: else if (fr.f.body) {
adamc@1260: saveEnv();
adamc@1260: env = cons(v, fr.f.env);
adamc@1260: e = fr.f.body;
adamc@1260: } else {
adamc@1260: e = {c: "c", v: fr.f(v)};
adamc@1260: stack = stack.next;
adamc@1260: }
adamc@1260: break;
adamc@1260: case "<":
adamc@1260: env = fr.env;
adamc@1260: stack = stack.next;
adamc@1260: break;
adamc@1260: case "r":
adamc@1260: fr.fs["_" + fr.n] = v;
adamc@1260: if (fr.l == null) {
adamc@1260: e = {c: "c", v: fr.fs};
adamc@1260: stack = stack.next;
adamc@1260: } else {
adamc@1260: fr.n = fr.l.data.n;
adamc@1260: e = fr.l.data.v;
adamc@1260: fr.l = fr.l.next;
adamc@1260: }
adamc@1260: break;
adamc@1260: case ".":
adamc@1260: e = {c: "c", v: v["_" + fr.f]};
adamc@1260: stack = stack.next;
adamc@1260: break;
adamc@1260: case ";":
adamc@1260: e = fr.e2;
adamc@1260: stack = stack.next;
adamc@1260: break;
adamc@1260: case "=":
adamc@1260: saveEnv();
adamc@1260: env = cons(v, env);
adamc@1260: e = fr.e2;
adamc@1260: break;
adamc@1260: case "m":
adamc@1260: var ps;
adamc@1260: for (ps = fr.p; ps != null; ps = ps.next) {
adamc@1260: var r = execP(env, ps.data.p, v);
adamc@1260: if (r != false) {
adamc@1260: saveEnv();
adamc@1260: env = r;
adamc@1260: e = ps.data.b;
adamc@1260: break;
adamc@1260: }
adamc@1260: }
adamc@1260: if (ps == null)
adamc@1260: whine("Match failure in Ur interpretation");
adamc@1260: break;
adamc@1260: default:
adamc@1260: whine("Unknown Ur continuation kind " + fr.c);
adamc@1260: }
adamc@1260:
adamc@1260: break;
adamc@1260: case "v":
adamc@1260: e = {c: "c", v: lookup(env, e.n)};
adamc@1260: break;
adamc@1260: case "n":
adamc@1260: var idx = e.n;
adamc@1260: e = urfuncs[idx];
adamc@1260: if (e.c == "t")
adamc@1262: e = urfuncs[idx] = eval("(" + e.f + ")");
adamc@1260: break;
adamc@1260: case "s":
adamc@1260: stack = cons({c: "s"}, stack);
adamc@1260: e = e.v;
adamc@1260: break;
adamc@1260: case "1":
adamc@1260: stack = cons({c: "1", n: e.n}, stack);
adamc@1260: e = e.v;
adamc@1260: break;
adamc@1260: case "f":
adamc@1260: if (e.a == null)
adamc@1260: e = {c: "c", v: (eval(e.f))()};
adamc@1260: else {
adamc@1260: var args = [];
adamc@1260: stack = cons({c: "f", f: eval(e.f), args: args, pos: 0, a: e.a.next}, stack);
adamc@1260: if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@1260: e = e.a.data;
adamc@1260: }
adamc@1260: break;
adamc@1260: case "l":
adamc@1260: e = {c: "c", v: {env: env, body: e.b}};
adamc@1260: break;
adamc@1260: case "a":
adamc@1260: stack = cons({c: "a1", x: e.x}, stack);
adamc@1260: e = e.f;
adamc@1260: break;
adamc@1260: case "r":
adamc@1260: if (e.l == null)
adamc@1260: whine("Empty Ur record in interpretation");
adamc@1260: var fs = {};
adamc@1260: stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@1260: e = e.l.data.v;
adamc@1260: break;
adamc@1260: case ".":
adamc@1260: stack = cons({c: ".", f: e.f}, stack);
adamc@1260: e = e.r;
adamc@1260: break;
adamc@1260: case ";":
adamc@1260: stack = cons({c: ";", e2: e.e2}, stack);
adamc@1260: e = e.e1;
adamc@1260: break;
adamc@1260: case "=":
adamc@1260: stack = cons({c: "=", e2: e.e2}, stack);
adamc@1260: e = e.e1;
adamc@1260: break;
adamc@1260: case "m":
adamc@1260: stack = cons({c: "m", p: e.p}, stack);
adamc@1260: e = e.e;
adamc@1260: break;
adamc@1260: case "e":
adamc@1260: e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@1260: break;
adamc@1260: case "wc":
adamc@1260: env = e.env;
adamc@1260: e = e.body;
adamc@1260: break;
adamc@1260: case "K":
adamc@1260: { var savedStack = stack.next, savedEnv = env;
adamc@1260: e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1260: usedK = true;
adamc@1260: break;
adamc@1260: default:
adamc@1260: whine("Unknown Ur expression kind " + e.c);
adamc@970: }
adamc@970: }
adamc@970: }
adamc@970:
adamc@976: function execD(e) {
adamc@1260: return exec0(null, e);
adamc@976: }
adamc@976:
adamc@970: function exec(e) {
adamc@1260: var r = exec0(null, e);
adamc@970:
adamc@1260: if (r != null && r.body != null)
adamc@1260: return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@1260: else
adamc@1260: return r;
adamc@895: }
adamc@895:
adamc@977: function execF(f, x) {
adamc@1260: return exec0(cons(x, f.env), f.body);
adamc@977: }
adamc@977:
adamc@895:
adam@1290: // Wrappers
adam@1290:
adam@1290: function confrm(s) {
adam@1290: return confirm(s) ? true : false;
adam@1290: }
adam@1290:
adam@1290:
adamc@1323: // URL blessing
adamc@1323:
adamc@1323: var urlRules = null;
adamc@1323:
adamc@1323: function checkUrl(s) {
adamc@1323: for (var r = urlRules; r; r = r.next) {
adamc@1323: var ru = r.data;
adamc@1323: if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
adamc@1323: return ru.allow ? s : null;
adamc@1323: }
adamc@1323:
adamc@1323: return null;
adamc@1323: }
adamc@1323:
adamc@1323: function bless(s) {
adamc@1323: u = checkUrl(s);
adamc@1323: if (u == null)
adamc@1323: er("Disallowed URL: " + s);
adamc@1323: return u;
adamc@1323: }
adamc@1323:
adamc@693: // App-specific code
adamc@693: