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import observable = require("data/observable");

import view = require("ui/core/view");

import bindable = require("ui/core/bindable");

import dockLayoutDef = require("ui/layouts/dock-layout");

import gridLayoutModule = require("ui/layouts/grid-layout");

import absoluteLayoutDef = require("ui/layouts/absolute-layout");

import types = require("utils/types");

import definition = require("ui/builder/component-builder");

import fs = require("file-system");

import gestures = require("ui/gestures");

import bindingBuilder = require("ui/builder/binding-builder");

import platform = require("platform");

var EVENT = "Event";

var UI_PATH = "ui/";

var MODULES = {

"ActivityIndicator": "ui/activity-indicator",

"ListView": "ui/list-view",

"GridLayout": "ui/layouts/grid-layout",

"DockLayout": "ui/layouts/dock-layout",

"WrapLayout": "ui/layouts/wrap-layout",

"AbsoluteLayout": "ui/layouts/absolute-layout",

"StackLayout": "ui/layouts/stack-layout",

"ScrollView": "ui/scroll-view",

"SearchBar": "ui/search-bar",

"SlideOut": "ui/slide-out",

"TabView": "ui/tab-view",

"TabViewItem": "ui/tab-view",

"TextField": "ui/text-field",

"TextView": "ui/text-view",

"FormattedString": "text/formatted-string",

"Span": "text/span",

"WebView": "ui/web-view",

"SegmentedBar": "ui/segmented-bar",

"SegmentedBarItem": "ui/segmented-bar",

"ToolBar": "ui/tool-bar",

"ToolBarItem": "ui/tool-bar",

"TimePicker": "ui/time-picker",

"DatePicker": "ui/date-picker",

"ListPicker": "ui/list-picker",

"MenuItem": "ui/page",

};

var ROW = "row";

var COL = "col";

var COL_SPAN = "colSpan";

var ROW_SPAN = "rowSpan";

var DOCK = "dock";

var LEFT = "left";

var TOP = "top";

export function getComponentModule(elementName: string, namespace: string, attributes: Object, exports: Object): definition.ComponentModule {

var instance: view.View;

var instanceModule: Object;

var componentModule: definition.ComponentModule;

// Get module id.

var moduleId = MODULES[elementName] || UI_PATH + elementName.toLowerCase();

try {

// Require module by module id.

instanceModule = require(types.isString(namespace) && fs.path.join(fs.knownFolders.currentApp().path, namespace) || moduleId);

// Get the component type from module.

var instanceType = instanceModule[elementName] || Object;

// Create instance of the component.

instance = new instanceType();

} catch (ex) {

throw new Error("Cannot create module " + moduleId + ". " + ex + ". StackTrace: " + ex.stack);

}

if (instance && instanceModule) {

var bindings = new Array<bindable.BindingOptions>();

for (var attr in attributes) {

var attrValue = <string>attributes[attr];

if (attr.indexOf(":") !== -1) {

var platformName = attr.split(":")[0].trim();

if (platformName.toLowerCase() === platform.device.os.toLowerCase()) {

attr = attr.split(":")[1].trim();

} else {

continue;

}

if (attr.indexOf(".") !== -1) {

var subObj = instance;

var properties = attr.split(".");

var subPropName = properties[properties.length - 1];

var i: number;

for (i = 0; i < properties.length - 1; i++) {

if (types.isDefined(subObj)) {

subObj = subObj[properties[i]];

}

if (types.isDefined(subObj)) {

setPropertyValue(subObj, instanceModule, exports, subPropName, attrValue);

}

} else {

setPropertyValue(instance, instanceModule, exports, attr, attrValue);

}

componentModule = { component: instance, exports: instanceModule, bindings: bindings };

}

return componentModule;

}

export function setPropertyValue(instance: view.View, instanceModule: Object, exports: Object, propertyName: string, propertyValue: string) {

// Note: instanceModule can be null if we are loading custom compnenet with no code-behind.

var isEvent: boolean = instanceModule && isKnownEvent(propertyName, instanceModule[instance.typeName]);

if (isBinding(propertyValue) && instance.bind) {

if (isEvent) {

attachEventBinding(instance, propertyName, propertyValue);

} else if (isGesture(propertyName, instance)) {

attachGestureBinding(instance, propertyName, propertyValue);

} else {

var bindOptions = bindingBuilder.getBindingOptions(propertyName, getBindingExpressionFromAttribute(propertyValue));

instance.bind({

sourceProperty: bindOptions[bindingBuilder.bindingConstants.sourceProperty],

targetProperty: bindOptions[bindingBuilder.bindingConstants.targetProperty],

expression: bindOptions[bindingBuilder.bindingConstants.expression],

twoWay: bindOptions[bindingBuilder.bindingConstants.twoWay]

}, bindOptions[bindingBuilder.bindingConstants.source]);

}

} else if (isEvent) {

// Get the event handler from page module exports.

var handler = exports && exports[propertyValue];

// Check if the handler is function and add it to the instance for specified event name.

if (types.isFunction(handler)) {

instance.on(propertyName, handler);

}

} else if (isGesture(propertyName, instance)) {

// Get the event handler from page module exports.

var gestureHandler = exports && exports[propertyValue];

// Check if the handler is function and add it to the instance for specified gesture.

if (types.isFunction(gestureHandler)) {

instance.observe(gestures.fromString(propertyName.toLowerCase()), gestureHandler);

}

} else if (propertyName === ROW) {

gridLayoutModule.GridLayout.setRow(instance, !isNaN(+propertyValue) && +propertyValue);

} else if (propertyName === COL) {

gridLayoutModule.GridLayout.setColumn(instance, !isNaN(+propertyValue) && +propertyValue);

} else if (propertyName === COL_SPAN) {

gridLayoutModule.GridLayout.setColumnSpan(instance, !isNaN(+propertyValue) && +propertyValue);

} else if (propertyName === ROW_SPAN) {

gridLayoutModule.GridLayout.setRowSpan(instance, !isNaN(+propertyValue) && +propertyValue);

} else if (propertyName === LEFT) {

absoluteLayoutDef.AbsoluteLayout.setLeft(instance, !isNaN(+propertyValue) && +propertyValue);

} else if (propertyName === TOP) {

absoluteLayoutDef.AbsoluteLayout.setTop(instance, !isNaN(+propertyValue) && +propertyValue);

} else if (propertyName === DOCK) {

dockLayoutDef.DockLayout.setDock(instance, propertyValue);

} else {

var attrHandled = false;

if ((<any>instance).applyXmlAttribute) {

attrHandled = (<any>instance).applyXmlAttribute(propertyName, propertyValue);

}

if (!attrHandled) {

// Try to convert value to number.

var valueAsNumber = +propertyValue;

if (!isNaN(valueAsNumber)) {

instance[propertyName] = valueAsNumber;

} else if (propertyValue && (propertyValue.toLowerCase() === "true" || propertyValue.toLowerCase() === "false")) {

instance[propertyName] = propertyValue.toLowerCase() === "true" ? true : false;

} else {

instance[propertyName] = propertyValue;

}

function attachEventBinding(instance: view.View, eventName: string, value: string) {

// Get the event handler from instance.bindingContext.

var propertyChangeHandler = (args: observable.PropertyChangeData) => {

if (args.propertyName === "bindingContext") {

var handler = instance.bindingContext && instance.bindingContext[getBindingExpressionFromAttribute(value)];

// Check if the handler is function and add it to the instance for specified event name.

if (types.isFunction(handler)) {

instance.on(eventName, handler, instance.bindingContext);

}

instance.off(observable.Observable.propertyChangeEvent, propertyChangeHandler);

}

};

instance.on(observable.Observable.propertyChangeEvent, propertyChangeHandler);

}

function attachGestureBinding(instance: view.View, gestureName: string, value: string) {

// Get the event handler from instance.bindingContext.

var propertyChangeHandler = (args: observable.PropertyChangeData) => {

if (args.propertyName === "bindingContext") {

var handler = instance.bindingContext && instance.bindingContext[getBindingExpressionFromAttribute(value)];

// Check if the handler is function and add it to the instance for specified event name.

if (types.isFunction(handler)) {

instance.observe(gestures.fromString(gestureName.toLowerCase()), handler, instance.bindingContext);

}

instance.off(observable.Observable.propertyChangeEvent, propertyChangeHandler);

}

};

instance.on(observable.Observable.propertyChangeEvent, propertyChangeHandler);

}

function isGesture(name: string, instance: any): boolean {

return gestures.fromString(name.toLowerCase()) !== undefined;

}

function isKnownEvent(name: string, exports: any): boolean {

var nameEvent = name + EVENT;

var result = !types.isNullOrUndefined(exports) ? nameEvent in exports : false;

return result;

}

function getBindingExpressionFromAttribute(value: string): string {

return value.replace("{{", "").replace("}}", "").trim();

}

function isBinding(value: string): boolean {

var isBinding;

if (types.isString(value)) {

var str = value.trim();

isBinding = str.indexOf("{{") === 0 && str.lastIndexOf("}}") === str.length - 2;

}

return isBinding;

}