git.iko.soy/elk
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elk/libraries/Native/JavaScript.js
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2Elm.Native.JavaScript = function(elm) {
3 'use strict';
5 elm.Native = elm.Native || {};
6 if (elm.Native.JavaScript) return elm.Native.JavaScript;
8 var List = Elm.Native.List(elm);
9 var Render = ElmRuntime.use(ElmRuntime.Render.Element);
11 function fromJS(v) {
12 var type = typeof v;
13 if (type === 'number' ) return v;
14 if (type === 'boolean') return v;
15 if (type === 'string' ) return List.fromArray(v);
16 if (v instanceof Array) {
17 var arr = [];
18 var len = v.length;
19 for (var i = 0; i < len; ++i) {
20 var x = fromJS(v[i]);
21 if (x !== null) arr.push(x);
22 }
23 return List.fromArray(arr);
24 }
25 if (type === 'object') {
26 var rec = { _:{} };
27 for (var f in v) {
28 var x = fromJS(v[f]);
29 if (x !== null) rec[f] = x;
30 }
31 return rec;
32 }
33 return null;
34 }
36 function toJS(v) {
37 var type = typeof v;
38 if (type === 'number' || type === 'boolean') return v;
39 if (type === 'object' && '_' in v) {
40 var obj = {};
41 for (var k in v) {
42 var x = v[k];
43 if (x !== null) obj[k] = x;
44 }
45 return obj;
46 }
47 if (type === 'object' && (v.ctor === 'Cons' || v.ctor === 'Nil')) {
48 var array = List.toArray(v);
49 for (var i = array.length; i--; ) {
50 array[i] = toJS(array[i]);
51 }
52 if (typeof array[0] === 'string') array.join('');
53 return array;
54 }
55 return null;
56 }
58 function fromRecord(r) {
59 if (typeof r === 'object' && '_' in r) {
60 return toJS(r);
61 }
62 throw new Error("'fromRecord' must be called on a record.");
63 }
65 function id(n) { return n; }
67 function toElement(w,h,domNode) {
68 return A3( newElement, w, h, {
69 ctor: 'Custom',
70 type: 'DomNode',
71 render: function(node) { return node; },
72 update: function(node,oldNode,newNode) {
73 if (node === newNode) return;
74 node.parentNode.replaceChild(newNode, node);
75 },
76 model: domNode
77 });
78 }
80 function fromElement(element) {
81 return Render.render(element);
82 }
84 return elm.Native.JavaScript = {
85 toFloat : id,
86 toBool : id,
87 toInt : function(n) { return n|0; },
88 toString : List.fromArray,
89 toList : List.fromArray,
90 fromString : function(s) { return List.toArray(s).join(''); },
91 fromList : List.toArray,
92 fromInt : id,
93 fromFloat : id,
94 fromBool : id,
96 toElement : toElement,
97 fromElement : fromElement,
98 toRecord : fromJS,
99 fromRecord : fromRecord
100 };
102};