adamc@580: function cons(v, ls) {
adamc@580:   return { n : ls, v : v };
adamc@580: }
adamc@579: function callAll(ls) {
adamc@579:   for (; ls; ls = ls.next)
adamc@579:     ls.v();
adamc@579: }
adamc@574: 
adamc@580: function sc(v) {
adamc@580:   return {v : v, h : null};
adamc@580: }
adamc@580: function sv(s, v) {
adamc@580:   s.v = v;
adamc@580:   callAll(s.h);
adamc@580: }
adamc@579: 
adamc@580: function ss(s) {
adamc@580:   return s;
adamc@580: }
adamc@580: function sr(v) {
adamc@580:   return {v : v, h : null};
adamc@580: }
adamc@580: function sb(x,y) {
adamc@580:   var z = y(x.v);
adamc@580:   var s = {v : z.v, h : null};
adamc@580: 
adamc@580:   function reZ() {
adamc@580:     z.h = cons(function() { s.v = z.v; callAll(s.h); }, z.h);    
adamc@580:   }
adamc@580: 
adamc@580:   x.h = cons(function() { z = y(x.v); reZ(); s.v = z.v; callAll(s.h); }, x.h);
adamc@580:   reZ();
adamc@580: 
adamc@580:   return s;
adamc@580: }
adamc@571: 
adamc@571: function dyn(s) {
adamc@571:   var x = document.createElement("span");
adamc@571:   x.innerHTML = s.v;
adamc@571:   document.body.appendChild(x);
adamc@580:   s.h = cons(function() { x.innerHTML = s.v }, s.h);
adamc@571: }