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/* --- Accessing document elements ------------------------------------------ */
function element(id) {
return document.getElementById(id);
}
/* --- JSONP ---------------------------------------------------------------- */
// Inspired by the function jsonp from
// http://www.west-wind.com/Weblog/posts/107136.aspx
// See also http://niryariv.wordpress.com/2009/05/05/jsonp-quickly/
// http://en.wikipedia.org/wiki/JSON#JSONP
function jsonp(url,callback)
{
if (url.indexOf("?") > -1)
url += "&jsonp="
else
url += "?jsonp="
url += callback;
//url += "&" + new Date().getTime().toString(); // prevent caching
var script = empty("script");
script.setAttribute("src",url);
script.setAttribute("type","text/javascript");
document.body.appendChild(script);
}
var json = {next:0};
// Like jsonp, but instead of passing the name of the ballback function, you
// pass the callback function directly, making it possible to use anonymous
// functions.
function jsonpf(url,callback)
{
var name="callback"+(json.next++);
json[name]=function(x) { delete json[name]; callback(x); }
jsonp(url,"json."+name);
}
/* --- HTML construction ---------------------------------------------------- */
function text(s) { return document.createTextNode(s); }
function empty(tag,name,value) {
var el=document.createElement(tag);
if(name && value) el.setAttribute(name,value);
return el;
}
function empty_id(tag,id) { return empty(tag,"id",id); }
function empty_class(tag,cls) { return empty(tag,"class",cls); }
function div_id(id) { return empty_id("div",id); }
function span_id(id) { return empty_id("span",id); }
function wrap(tag,contents) {
var el=empty(tag);
el.appendChild(contents);
return el;
}
function wrap_class(tag,cls,contents) {
var el=empty_class(tag,cls);
if(contents) el.appendChild(contents);
return el;
}
function span_class(cls,contents) { return wrap_class("span",cls,contents); }
function div_class(cls,contents) { return wrap_class("div",cls,contents); }
function p(contents) { return wrap("p",contents); }
function dt(contents) { return wrap("dt",contents); }
function li(contents) { return wrap("li",contents); }
function th(contents) { return wrap("th",contents); }
function td(contents) { return wrap("td",contents); }
function tr(cells) {
var tr=empty("tr");
for(var i=0;i<cells.length;i++)
tr.appendChild(cells[i]);
return tr;
}
function button(label,action) {
var el=empty("input","type","button");
el.setAttribute("value",label);
el.setAttribute("onclick",action);
return el;
}
function option(label,value) {
var el=empty("option","value",value);
el.innerHTML=label;
return el;
}
function appendChildren(el,cs) {
for(var i=0;i<cs.length;i++)
el.appendChild(cs[i]);
return el;
}
function tda(cs) { return appendChildren(empty("td"),cs); }
function img(src) { return empty("img","src",src); }
/* --- Debug ---------------------------------------------------------------- */
function show_props(obj, objName) {
var result = "";
for (var i in obj) {
result += objName + "." + i + " = " + obj[i] + "<br>";
}
return result;
}
function field_names(obj) {
var result = "";
for (var i in obj) {
result += " " + i;
}
return result;
}
/* --- Data manipulation ---------------------------------------------------- */
function swap(a,i,j) { // Note: this doesn't work on strings.
var tmp=a[i];
a[i]=a[j];
a[j]=tmp;
return a;
}
function sort(a) {
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Array/sort
return a.sort();
/* // Note: this doesn't work on strings.
for(var i=0;i<a.length-1;i++) {
var min=i;
for(var j=i+1;j<a.length;j++)
if(a[j]<a[min]) min=j;
if(min!=i) swap(a,i,min);
}
return a;
*/
}
function filter(p,xs) {
var ys=[];
for(var i=0;i<xs.length;i++)
if(p(xs[i])) ys[ys.length]=xs[i];
return ys;
}
function implode(cs) { // array of strings to string
/*
var s="";
for(var i=0;i<cs.length;i++)
s+=cs[i];
return s;
*/
return cs.join("");
}
function hasPrefix(s,pre) { return s.substr(0,pre.length)==pre; }
/*
function all(p,xs) {
for(var i=0;i<xs.length;i++)
if(!p(xs[i])) return false;
return true;
}
*/
function map(f,xs) {
var ys=[];
for(var i=0;i<xs.length;i++) ys[i]=f(xs[i]);
return ys;
}
// map in continuation passing style
function mapc(f,xs,cont) { mapc_from(f,xs,0,[],cont); }
function mapc_from(f,xs,i,ys,cont) {
if(i<xs.length)
f(xs[i],function(y){ys[i]=y;mapc_from(f,xs,i+1,ys,cont)});
else
cont(ys);
}
function overlaps(as,bs) {
for(var i=0;i<as.length;i++)
if(elem(as[i],bs)) return true;
return false;
}
function elem(a,as) {
for(var i=0;i<as.length;i++)
if(a==as[i]) return true;
return false;
}
function shuffle(a) {
for(i=0;i<a.length;i++) swap(a,i,Math.floor(Math.random()*a.length))
return a;
}
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