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GeezerVison is showing github.com — NativeScript/ui/builder/builder.ts at master · alvsgithub/NativeScript

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import view = require("ui/core/view");
import fs = require("file-system");
import xml = require("xml");
import file_access_module = require("file-system/file-system-access");
import types = require("utils/types");
import componentBuilder = require("ui/builder/component-builder");
import templateBuilderDef = require("ui/builder/template-builder");
var KNOWNCOLLECTIONS = "knownCollections";
export function parse(value: string, exports: any): view.View {
var viewToReturn: view.View;
var componentModule = parseInternal(value, exports);
if (componentModule) {
viewToReturn = componentModule.component;
}
return viewToReturn;
}
function parseInternal(value: string, exports: any): componentBuilder.ComponentModule {
var rootComponentModule: componentBuilder.ComponentModule;
// Temporary collection used for parent scope.
var parents = new Array<componentBuilder.ComponentModule>();
var complexProperties = new Array<ComplexProperty>();
var templateBuilder: templateBuilderDef.TemplateBuilder;
// Parse the XML.
var xmlParser = new xml.XmlParser((args: xml.ParserEvent) => {
if (templateBuilder) {
if (args.eventType === xml.ParserEventType.StartElement) {
templateBuilder.addStartElement(args.prefix, args.namespace, args.elementName, args.attributes);
} else if (args.eventType === xml.ParserEventType.EndElement) {
if (templateBuilder.elementName !== args.elementName) {
templateBuilder.addEndElement(args.prefix, args.elementName);
} else {
templateBuilder.build();
templateBuilder = undefined;
}
}
}
// Get the current parent.
var parent = parents[parents.length - 1];
var complexProperty = complexProperties[complexProperties.length - 1];
// Create component instance from every element declaration.
if (args.eventType === xml.ParserEventType.StartElement) {
if (isComplexProperty(args.elementName)) {
var name = getComplexProperty(args.elementName);
complexProperties.push({
parent: parent,
name: name,
items: [],
});
if (templateBuilderDef.isKnownTemplate(name, parent.exports)) {
templateBuilder = new templateBuilderDef.TemplateBuilder({
parent: parent,
name: name,
elementName: args.elementName,
templateItems: []
});
}
} else {
var componentModule: componentBuilder.ComponentModule;
if (args.prefix) {
// Custom components
var ns = args.namespace;
if (ns) {
var xmlPath = fs.path.join(fs.knownFolders.currentApp().path, ns, args.elementName) + ".xml";
if (fs.File.exists(xmlPath)) {
// Custom components with XML
var jsPath = xmlPath.replace(".xml", ".js");
var subExports;
if (fs.File.exists(jsPath)) {
// Custom components with XML and code
subExports = require(jsPath.replace(".js", ""))
}
componentModule = loadInternal(xmlPath, subExports);
// Attributes will be transfered to the custom component
if (types.isDefined(componentModule) && types.isDefined(componentModule.component)) {
var attr: string;
for (attr in args.attributes) {
componentBuilder.setPropertyValue(componentModule.component, subExports, exports, attr, args.attributes[attr]);
}
}
} else {
// Custom components without XML
componentModule = componentBuilder.getComponentModule(args.elementName, ns, args.attributes, exports);
}
}
} else {
// Default components
componentModule = componentBuilder.getComponentModule(args.elementName, ns, args.attributes, exports);
}
if (componentModule) {
if (parent) {
if (componentModule.component instanceof view.View) {
if (complexProperty) {
// Add to complex property to component.
addToComplexProperty(parent, complexProperty, componentModule)
} else if ((<any>parent.component)._addChildFromBuilder) {
// Add component to visual tree
(<any>parent.component)._addChildFromBuilder(args.elementName, componentModule.component);
}
} else if (complexProperty) {
// Add component to complex property of parent component.
addToComplexProperty(parent, complexProperty, componentModule);
}
} else if (parents.length === 0) {
// Set root component.
rootComponentModule = componentModule;
}
// Add the component instance to the parents scope collection.
parents.push(componentModule);
}
}
} else if (args.eventType === xml.ParserEventType.EndElement) {
if (isComplexProperty(args.elementName)) {
if (complexProperty) {
if (parent && (<any>parent.component)._addArrayFromBuilder) {
// If parent is AddArrayFromBuilder call the interface method to populate the array property.
(<any>parent.component)._addArrayFromBuilder(complexProperty.name, complexProperty.items);
complexProperty.items = [];
}
}
// Remove the last complexProperty from the complexProperties collection (move to the previous complexProperty scope).
complexProperties.pop();
} else {
// Remove the last parent from the parents collection (move to the previous parent scope).
parents.pop();
}
}
}, (e) => {
throw new Error("XML parse error: " + e.message);
}, true);
if (types.isString(value)) {
value = value.replace(/xmlns=("|')http:\/\/www.nativescript.org\/tns.xsd\1/, "");
xmlParser.parse(value);
}
return rootComponentModule;
}
export function load(fileName: string, exports: any): view.View {
var viewToReturn: view.View;
var componentModule = loadInternal(fileName, exports);
if (componentModule) {
viewToReturn = componentModule.component;
}
return viewToReturn;
}
function loadInternal(fileName: string, exports: any): componentBuilder.ComponentModule {
var componentModule: componentBuilder.ComponentModule;
// Check if the XML file exists.
if (fileName && fs.File.exists(fileName)) {
var fileAccess = new file_access_module.FileSystemAccess();
// Read the XML file.
fileAccess.readText(fileName, result => {
componentModule = parseInternal(result, exports);
}, (e) => {
throw new Error("Error loading file " + fileName + " :" + e.message);
});
}
if (componentModule && componentModule.component) {
// Save exports to root component (will be used for templates).
(<any>componentModule.component).exports = exports;
}
return componentModule;
}
function isComplexProperty(name: string): boolean {
return types.isString(name) && name.indexOf(".") !== -1;
}
function getComplexProperty(fullName: string): string {
var name: string;
if (types.isString(fullName)) {
var names = fullName.split(".");
name = names[names.length - 1];
}
return name;
}
function isKnownCollection(name: string, exports: any): boolean {
return KNOWNCOLLECTIONS in exports && exports[KNOWNCOLLECTIONS] && name in exports[KNOWNCOLLECTIONS];
}
function addToComplexProperty(parent: componentBuilder.ComponentModule, complexProperty, elementModule: componentBuilder.ComponentModule) {
// If property name is known collection we populate array with elements.
var parentComponent = <any>parent.component;
if (isKnownCollection(complexProperty.name, parent.exports)) {
complexProperty.items.push(elementModule.component);
} else if (parentComponent._addChildFromBuilder) {
parentComponent._addChildFromBuilder("", elementModule.component);
} else {
// Or simply assign the value;
parentComponent[complexProperty.name] = elementModule.component;
}
}
interface ComplexProperty {
parent: componentBuilder.ComponentModule;
name: string;
items?: Array<any>;
}
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