data-* bindings for Dojo

data.js

define([
	'exports',
	'dojo/has',
	'dojo/dom'
], function(exports, has, dom){
	has.add('dom-dataset', function(global, document, element){
		return typeof element.dataset === 'object' && !!element.dataset;
	});

	var ccRE = /(-+)([^-])/g;
	function camelCase(attribute){
		return attribute.replace(ccRE, function(substr, dashes, letter){
			return dashes.slice(1) + letter.toUpperCase();
		});
	}

	var dccRE = /[A-Z]/g;
	function deCamelCase(attribute){
		return attribute.replace(dccRE, function(uppercase){
			return '-' + uppercase.toLowerCase();
		});
	}

	if(has('dom-dataset')){
		exports.get = function(node, attribute){
			node = dom.byId(node);

			if(attribute){
				return node.dataset[camelCase(attribute)];
			}else{
				var data = {};
				for(var name in node.dataset){
					data[name] = node.dataset[name];
				}
				return data;
			}
		};

		exports.set = function(node, attribute, value){
			node = dom.byId(node);

			if(typeof attribute === 'object' && attribute){
				for(var name in attribute){
					exports.set(node, name, attribute[name]);
				}
			}else{
				node.dataset[camelCase(attribute)] = value || null;
			}
		};
	}else{
		var dataRE = /^data-/;
		exports.get = function(node, attribute){
			node = dom.byId(node);

			if(attribute){
				return node.getAttribute('data-' + deCamelCase(attribute));
			}else{
				var data = {};
				for(var i=0; attribute=node.attributes[i]; i++){
					if(dataRE.test(attribute.name)){
						data[camelCase(attribute.name.replace(dataRE, ''))] = attribute.value;
					}
				}
				return data;
			}
		};

		exports.set = function(node, attribute, value){
			node = dom.byId(node);

			if(typeof attribute === 'object' && attribute){
				for(var name in attribute){
					exports.set(node, name, attribute[name]);
				}
			}else{
				node.setAttribute('data-' + deCamelCase(attribute), '' + value);
			}
		};
	}
});