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/*global angular, CodeMirror, Error*/
/**
* Binds a CodeMirror widget to a <textarea> element.
*/
angular.module('ui.directives').directive('uiCodemirror', ['ui.config', '$timeout', function (uiConfig, $timeout) {
'use strict';
var events = ["cursorActivity", "viewportChange", "gutterClick", "focus", "blur", "scroll", "update"];
return {
restrict:'A',
require:'ngModel',
link:function (scope, elm, attrs, ngModel) {
var options, opts, onChange, deferCodeMirror, codeMirror;
if (elm[0].type !== 'textarea') {
throw new Error('uiCodemirror3 can only be applied to a textarea element');
}
options = uiConfig.codemirror || {};
opts = angular.extend({}, options, scope.$eval(attrs.uiCodemirror));
onChange = function (aEvent) {
return function (instance, changeObj) {
var newValue = instance.getValue();
if (newValue !== ngModel.$viewValue) {
ngModel.$setViewValue(newValue);
scope.$apply();
}
if (typeof aEvent === "function")
aEvent(instance, changeObj);
};
};
deferCodeMirror = function () {
codeMirror = CodeMirror.fromTextArea(elm[0], opts);
codeMirror.on("change", onChange(opts.onChange));
for (var i = 0, n = events.length, aEvent; i < n; ++i) {
aEvent = opts["on" + events[i].charAt(0).toUpperCase() + events[i].slice(1)];
if (aEvent === void 0) continue;
if (typeof aEvent !== "function") continue;
codeMirror.on(events[i], aEvent);
}
// CodeMirror expects a string, so make sure it gets one.
// This does not change the model.
ngModel.$formatters.push(function (value) {
if (angular.isUndefined(value) || value === null) {
return '';
}
else if (angular.isObject(value) || angular.isArray(value)) {
throw new Error('ui-codemirror cannot use an object or an array as a model');
}
return value;
});
// Override the ngModelController $render method, which is what gets called when the model is updated.
// This takes care of the synchronizing the codeMirror element with the underlying model, in the case that it is changed by something else.
ngModel.$render = function () {
codeMirror.setValue(ngModel.$viewValue);
};
// Watch ui-refresh and refresh the directive
if (attrs.uiRefresh) {
scope.$watch(attrs.uiRefresh, function(newVal, oldVal){
// Skip the initial watch firing
if (newVal !== oldVal)
$timeout(codeMirror.refresh);
});
}
};
$timeout(deferCodeMirror);
}
};
}]);
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