105 lines
2.8 KiB
JavaScript
105 lines
2.8 KiB
JavaScript
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Elm.Native.JavaScript = function(elm) {
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'use strict';
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elm.Native = elm.Native || {};
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if (elm.Native.JavaScript) return elm.Native.JavaScript;
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var List = Elm.Native.List(elm);
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var Render = ElmRuntime.use(ElmRuntime.Render.Element);
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function fromJS(v) {
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var type = typeof v;
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if (type === 'number' ) return v;
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if (type === 'boolean') return v;
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if (type === 'string' ) return List.fromArray(v);
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if (v instanceof Array) {
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var arr = [];
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var len = v.length;
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for (var i = 0; i < len; ++i) {
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var x = fromJS(v[i]);
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if (x !== null) arr.push(x);
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}
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return List.fromArray(arr);
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}
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if (type === 'object') {
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var rec = { _:{} };
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for (var f in v) {
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var x = fromJS(v[f]);
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if (x !== null) rec[f] = x;
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}
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return rec;
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}
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return null;
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}
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function toJS(v) {
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var type = typeof v;
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if (type === 'number' || type === 'boolean') return v;
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if (type === 'object' && '_' in v) {
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var obj = {};
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for (var k in v) {
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var x = toJS(v[k]);
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if (x !== null) obj[k] = x;
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}
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return obj;
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}
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if (type === 'object' && (v.ctor === '::' || v.ctor === '[]')) {
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var array = List.toArray(v);
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if (typeof array[0] === 'string') {
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array = array.join('');
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} else {
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for (var i = array.length; i--; ) {
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array[i] = toJS(array[i]);
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}
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}
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return array;
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}
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return null;
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}
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function fromRecord(r) {
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if (typeof r === 'object' && '_' in r) {
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return toJS(r);
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}
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throw new Error("'fromRecord' must be called on a record.");
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}
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function id(n) { return n; }
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function toElement(w,h,domNode) {
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return A3( newElement, w, h, {
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ctor: 'Custom',
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type: 'DomNode',
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render: function(node) { return node; },
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update: function(node,oldNode,newNode) {
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if (node === newNode) return;
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node.parentNode.replaceChild(newNode, node);
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},
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model: domNode
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});
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}
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function fromElement(element) {
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return Render.render(element);
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}
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return elm.Native.JavaScript = {
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toFloat : id,
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toBool : id,
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toInt : function(n) { return n|0; },
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toString : List.fromArray,
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toList : List.fromArray,
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fromString : function(s) { return List.toArray(s).join(''); },
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fromList : List.toArray,
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fromInt : id,
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fromFloat : id,
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fromBool : id,
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toElement : toElement,
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fromElement : fromElement,
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toRecord : fromJS,
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fromRecord : fromRecord
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};
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};
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