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56 lines (53 loc) · 1.81 KB
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/**
* @private
*/
IonicModule
.factory('$ionicBind', ['$parse', '$interpolate', function($parse, $interpolate) {
var LOCAL_REGEXP = /^\s*([@=&])(\??)\s*(\w*)\s*$/;
return function(scope, attrs, bindDefinition) {
forEach(bindDefinition || {}, function(definition, scopeName) {
//Adapted from angular.js $compile
var match = definition.match(LOCAL_REGEXP) || [],
attrName = match[3] || scopeName,
mode = match[1], // @, =, or &
parentGet,
unwatch;
switch (mode) {
case '@':
if (!attrs[attrName]) {
return;
}
attrs.$observe(attrName, function(value) {
scope[scopeName] = value;
});
// we trigger an interpolation to ensure
// the value is there for use immediately
if (attrs[attrName]) {
scope[scopeName] = $interpolate(attrs[attrName])(scope);
}
break;
case '=':
if (!attrs[attrName]) {
return;
}
unwatch = scope.$watch(attrs[attrName], function(value) {
scope[scopeName] = value;
});
//Destroy parent scope watcher when this scope is destroyed
scope.$on('$destroy', unwatch);
break;
case '&':
/* jshint -W044 */
if (attrs[attrName] && attrs[attrName].match(RegExp(scopeName + '\(.*?\)'))) {
throw new Error('& expression binding "' + scopeName + '" looks like it will recursively call "' +
attrs[attrName] + '" and cause a stack overflow! Please choose a different scopeName.');
}
parentGet = $parse(attrs[attrName]);
scope[scopeName] = function(locals) {
return parentGet(scope, locals);
};
break;
}
});
};
}]);