mirror of
https://github.com/NativeScript/NativeScript.git
synced 2025-11-04 12:58:38 +08:00
530 lines
16 KiB
TypeScript
530 lines
16 KiB
TypeScript
import { View, Template, KeyedTemplate } from '../core/view';
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import { ScopeError, SourceError, Source } from '../../utils/debug';
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import * as xml from '../../xml';
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import { isString, isObject } from '../../utils/types';
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import { getComponentModule } from './component-builder';
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import type { ComponentModule } from './component-builder';
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import { Device } from '../../platform';
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import { profile } from '../../profiling';
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import { android, ios, visionos, apple, loadCustomComponent, defaultNameSpaceMatcher, getExports, Builder } from './index';
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export namespace xml2ui {
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/**
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* Pipes and filters:
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* https://en.wikipedia.org/wiki/Pipeline_(software)
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*/
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interface XmlProducer {
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pipe<Next extends XmlConsumer>(next: Next): Next;
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}
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interface XmlConsumer {
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parse(args: xml.ParserEvent);
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}
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interface ParseInputData extends String {
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default?: string;
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}
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export class XmlProducerBase implements XmlProducer {
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private _next: XmlConsumer;
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public pipe<Next extends XmlConsumer>(next: Next) {
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this._next = next;
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return next;
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}
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protected next(args: xml.ParserEvent) {
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this._next.parse(args);
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}
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}
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export class XmlStringParser extends XmlProducerBase implements XmlProducer {
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private error: ErrorFormatter;
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constructor(error?: ErrorFormatter) {
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super();
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this.error = error || PositionErrorFormat;
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}
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public parse(value: ParseInputData) {
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if (__UI_USE_XML_PARSER__) {
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const xmlParser = new xml.XmlParser(
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(args: xml.ParserEvent) => {
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try {
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this.next(args);
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} catch (e) {
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throw this.error(e, args.position);
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}
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},
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(e, p) => {
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throw this.error(e, p);
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},
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true,
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);
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if (isString(value)) {
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xmlParser.parse(<string>value);
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} else if (isObject(value) && isString(value.default)) {
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xmlParser.parse(value.default);
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}
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}
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}
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}
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interface ErrorFormatter {
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(e: Error, p: xml.Position): Error;
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}
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export function PositionErrorFormat(e: Error, p: xml.Position): Error {
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return new ScopeError(e, 'Parsing XML at ' + p.line + ':' + p.column);
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}
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export function SourceErrorFormat(uri): ErrorFormatter {
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return (e: Error, p: xml.Position) => {
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const source = p ? new Source(uri, p.line, p.column) : new Source(uri, -1, -1);
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e = new SourceError(e, source, 'Building UI from XML.');
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return e;
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};
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}
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interface SourceTracker {
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(component: any, p: xml.Position): void;
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}
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export function ComponentSourceTracker(uri): SourceTracker {
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return (component: any, p: xml.Position) => {
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if (!Source.get(component)) {
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const source = p ? new Source(uri, p.line, p.column) : new Source(uri, -1, -1);
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Source.set(component, source);
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}
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};
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}
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export class PlatformFilter extends XmlProducerBase implements XmlProducer, XmlConsumer {
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private currentPlatformContext: string;
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public parse(args: xml.ParserEvent) {
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if (args.eventType === xml.ParserEventType.StartElement) {
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if (PlatformFilter.isPlatform(args.elementName)) {
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if (this.currentPlatformContext) {
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throw new Error("Already in '" + this.currentPlatformContext + "' platform context and cannot switch to '" + args.elementName + "' platform! Platform tags cannot be nested.");
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}
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this.currentPlatformContext = args.elementName;
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return;
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}
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}
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if (args.eventType === xml.ParserEventType.EndElement) {
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if (PlatformFilter.isPlatform(args.elementName)) {
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this.currentPlatformContext = undefined;
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return;
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}
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}
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if (this.currentPlatformContext && !PlatformFilter.isCurentPlatform(this.currentPlatformContext)) {
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return;
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}
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this.next(args);
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}
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private static isPlatform(value: string): boolean {
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if (value) {
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const toLower = value.toLowerCase();
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return toLower === android || toLower === ios || toLower === visionos || toLower === apple;
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}
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return false;
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}
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private static isCurentPlatform(value: string): boolean {
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value = value && value.toLowerCase();
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return value === apple ? __APPLE__ : value === Device.os.toLowerCase();
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}
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}
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export class XmlArgsReplay extends XmlProducerBase implements XmlProducer {
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private error: ErrorFormatter;
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private args: xml.ParserEvent[];
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constructor(args: xml.ParserEvent[], errorFormat: ErrorFormatter) {
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super();
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this.args = args;
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this.error = errorFormat;
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}
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public replay() {
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this.args.forEach((args: xml.ParserEvent) => {
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try {
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this.next(args);
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} catch (e) {
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throw this.error(e, args.position);
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}
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});
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}
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}
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interface TemplateProperty {
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context?: any;
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parent: ComponentModule;
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name: string;
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elementName: string;
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templateItems: Array<string>;
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errorFormat: ErrorFormatter;
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sourceTracker: SourceTracker;
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}
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/**
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* It is a state pattern
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* https://en.wikipedia.org/wiki/State_pattern
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*/
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export class XmlStateParser implements XmlConsumer {
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private state: XmlStateConsumer;
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constructor(state: XmlStateConsumer) {
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this.state = state;
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}
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parse(args: xml.ParserEvent) {
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this.state = this.state.parse(args);
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}
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}
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interface XmlStateConsumer extends XmlConsumer {
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parse(args: xml.ParserEvent): XmlStateConsumer;
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}
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export class TemplateParser implements XmlStateConsumer {
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private _context: any;
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private _recordedXmlStream: Array<xml.ParserEvent>;
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private _templateProperty: TemplateProperty;
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private _nestingLevel: number;
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private _state: TemplateParser.State;
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private parent: XmlStateConsumer;
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private _setTemplateProperty: boolean;
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constructor(parent: XmlStateConsumer, templateProperty: TemplateProperty, setTemplateProperty = true) {
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this.parent = parent;
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this._context = templateProperty.context;
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this._recordedXmlStream = new Array<xml.ParserEvent>();
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this._templateProperty = templateProperty;
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this._nestingLevel = 0;
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this._state = TemplateParser.State.EXPECTING_START;
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this._setTemplateProperty = setTemplateProperty;
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}
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public parse(args: xml.ParserEvent): XmlStateConsumer {
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if (args.eventType === xml.ParserEventType.StartElement) {
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this.parseStartElement(args.prefix, args.namespace, args.elementName, args.attributes);
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} else if (args.eventType === xml.ParserEventType.EndElement) {
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this.parseEndElement(args.prefix, args.elementName);
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}
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this._recordedXmlStream.push(args);
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return this._state === TemplateParser.State.FINISHED ? this.parent : this;
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}
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public get elementName(): string {
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return this._templateProperty.elementName;
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}
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private parseStartElement(prefix: string, namespace: string, elementName: string, attributes: Object) {
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if (this._state === TemplateParser.State.EXPECTING_START) {
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this._state = TemplateParser.State.PARSING;
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} else if (this._state === TemplateParser.State.FINISHED) {
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throw new Error('Template must have exactly one root element but multiple elements were found.');
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}
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this._nestingLevel++;
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}
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private parseEndElement(prefix: string, elementName: string) {
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if (this._state === TemplateParser.State.EXPECTING_START) {
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throw new Error('Template must have exactly one root element but none was found.');
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} else if (this._state === TemplateParser.State.FINISHED) {
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throw new Error('No more closing elements expected for this template.');
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}
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this._nestingLevel--;
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if (this._nestingLevel === 0) {
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this._state = TemplateParser.State.FINISHED;
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if (this._setTemplateProperty && this._templateProperty.name in this._templateProperty.parent.component) {
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const template = this.buildTemplate();
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this._templateProperty.parent.component[this._templateProperty.name] = template;
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}
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}
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}
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public buildTemplate(): Template {
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if (__UI_USE_XML_PARSER__) {
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const context = this._context;
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const errorFormat = this._templateProperty.errorFormat;
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const sourceTracker = this._templateProperty.sourceTracker;
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const template: Template = <Template>profile('Template()', () => {
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let start: xml2ui.XmlArgsReplay;
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let ui: xml2ui.ComponentParser;
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(start = new xml2ui.XmlArgsReplay(this._recordedXmlStream, errorFormat))
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// No platform filter, it has been filtered already
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.pipe(new XmlStateParser((ui = new ComponentParser(context, errorFormat, sourceTracker))));
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start.replay();
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return ui.rootComponentModule.component;
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});
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return template;
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} else {
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return null;
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}
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}
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}
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export class MultiTemplateParser implements XmlStateConsumer {
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private _childParsers = new Array<TemplateParser>();
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private _value: KeyedTemplate[];
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get value(): KeyedTemplate[] {
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return this._value;
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}
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constructor(
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private parent: XmlStateConsumer,
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private templateProperty: TemplateProperty,
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) {}
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public parse(args: xml.ParserEvent): XmlStateConsumer {
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if (args.eventType === xml.ParserEventType.StartElement && args.elementName === 'template') {
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const childParser = new TemplateParser(this, this.templateProperty, false);
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childParser['key'] = args.attributes['key'];
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this._childParsers.push(childParser);
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return childParser;
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}
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if (args.eventType === xml.ParserEventType.EndElement) {
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const name = ComponentParser.getComplexPropertyName(args.elementName);
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if (name === this.templateProperty.name) {
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const templates = new Array<KeyedTemplate>();
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for (let i = 0; i < this._childParsers.length; i++) {
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templates.push({
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key: this._childParsers[i]['key'],
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createView: this._childParsers[i].buildTemplate(),
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});
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}
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this._value = templates;
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return this.parent.parse(args);
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}
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}
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return this;
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}
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}
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export namespace TemplateParser {
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export const enum State {
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EXPECTING_START,
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PARSING,
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FINISHED,
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}
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}
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export class ComponentParser implements XmlStateConsumer {
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private static KNOWNCOLLECTIONS = 'knownCollections';
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private static KNOWNTEMPLATES = 'knownTemplates';
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private static KNOWNMULTITEMPLATES = 'knownMultiTemplates';
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public rootComponentModule: ComponentModule;
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private context: any;
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private currentRootView: View;
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private parents = new Array<ComponentModule>();
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private complexProperties = new Array<ComponentParser.ComplexProperty>();
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private error: ErrorFormatter;
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private sourceTracker: SourceTracker;
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constructor(
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context: any,
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errorFormat: ErrorFormatter,
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sourceTracker: SourceTracker,
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private moduleName?: string,
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) {
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this.context = context;
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this.error = errorFormat;
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this.sourceTracker = sourceTracker;
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}
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@profile
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private buildComponent(args: xml.ParserEvent): ComponentModule {
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if (args.prefix && args.namespace) {
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// Custom components
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return loadCustomComponent(args.namespace, args.elementName, args.attributes, this.context, this.currentRootView, !this.currentRootView, this.moduleName);
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} else {
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// Default components
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let namespace = args.namespace;
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if (defaultNameSpaceMatcher.test(namespace || '')) {
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//Ignore the default ...tns.xsd namespace URL
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namespace = undefined;
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}
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return getComponentModule(args.elementName, namespace, args.attributes, this.context, this.moduleName, !this.currentRootView);
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}
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}
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public parse(args: xml.ParserEvent): XmlStateConsumer {
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// Get the current parent.
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const parent = this.parents[this.parents.length - 1];
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const complexProperty = this.complexProperties[this.complexProperties.length - 1];
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// Create component instance from every element declaration.
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if (args.eventType === xml.ParserEventType.StartElement) {
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if (ComponentParser.isComplexProperty(args.elementName)) {
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const name = ComponentParser.getComplexPropertyName(args.elementName);
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const complexProperty: ComponentParser.ComplexProperty = {
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parent: parent,
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name: name,
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items: [],
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};
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this.complexProperties.push(complexProperty);
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if (ComponentParser.isKnownTemplate(name, parent.exports)) {
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return new TemplateParser(this, {
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context: (parent ? getExports(parent.component) : null) || this.context,
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parent: parent,
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name: name,
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elementName: args.elementName,
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templateItems: [],
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errorFormat: this.error,
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sourceTracker: this.sourceTracker,
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});
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}
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if (ComponentParser.isKnownMultiTemplate(name, parent.exports)) {
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const parser = new MultiTemplateParser(this, {
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context: (parent ? getExports(parent.component) : null) || this.context,
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parent: parent,
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name: name,
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elementName: args.elementName,
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templateItems: [],
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errorFormat: this.error,
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sourceTracker: this.sourceTracker,
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});
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complexProperty.parser = parser;
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return parser;
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}
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} else {
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const componentModule = this.buildComponent(args);
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if (componentModule) {
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this.sourceTracker(componentModule.component, args.position);
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if (parent) {
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if (complexProperty && complexProperty.parent == parent) {
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// Add component to complex property of parent component.
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ComponentParser.addToComplexProperty(parent, complexProperty, componentModule);
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} else if ((<any>parent.component)._addChildFromBuilder) {
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(<any>parent.component)._addChildFromBuilder(args.elementName, componentModule.component);
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}
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} else if (this.parents.length === 0) {
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// Set root component.
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this.rootComponentModule = componentModule;
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if (this.rootComponentModule) {
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this.currentRootView = this.rootComponentModule.component;
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if ((<any>this.currentRootView).exports) {
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this.context = (<any>this.currentRootView).exports;
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}
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}
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}
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// Add the component instance to the parents scope collection.
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this.parents.push(componentModule);
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}
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}
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} else if (args.eventType === xml.ParserEventType.EndElement) {
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if (ComponentParser.isComplexProperty(args.elementName)) {
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if (complexProperty) {
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if (complexProperty.parser) {
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parent.component[complexProperty.name] = complexProperty.parser.value;
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} else if (parent && (<any>parent.component)._addArrayFromBuilder) {
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// If parent is AddArrayFromBuilder call the interface method to populate the array property.
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(<any>parent.component)._addArrayFromBuilder(complexProperty.name, complexProperty.items);
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complexProperty.items = [];
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}
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}
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// Remove the last complexProperty from the complexProperties collection (move to the previous complexProperty scope).
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this.complexProperties.pop();
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} else {
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// Remove the last parent from the parents collection (move to the previous parent scope).
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this.parents.pop();
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}
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}
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return this;
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}
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private static isComplexProperty(name: string): boolean {
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return isString(name) && name.indexOf('.') !== -1;
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}
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public static getComplexPropertyName(fullName: string): string {
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let name: string;
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if (isString(fullName)) {
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const names = fullName.split('.');
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name = names[names.length - 1];
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}
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return name;
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}
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private static isKnownTemplate(name: string, exports: any): boolean {
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return Builder.knownTemplates.has(name);
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}
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private static isKnownMultiTemplate(name: string, exports: any): boolean {
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return Builder.knownMultiTemplates.has(name);
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}
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private static addToComplexProperty(parent: ComponentModule, complexProperty: ComponentParser.ComplexProperty, elementModule: ComponentModule) {
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// If property name is known collection we populate array with elements.
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const parentComponent = <any>parent.component;
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if (ComponentParser.isKnownCollection(complexProperty.name, parent.exports)) {
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complexProperty.items.push(elementModule.component);
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} else if (parentComponent._addChildFromBuilder) {
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parentComponent._addChildFromBuilder(complexProperty.name, elementModule.component);
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} else {
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// Or simply assign the value;
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parentComponent[complexProperty.name] = elementModule.component;
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}
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}
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private static isKnownCollection(name: string, context: any): boolean {
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return Builder.knownCollections.has(name);
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}
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}
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export namespace ComponentParser {
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export interface ComplexProperty {
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parent: ComponentModule;
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name: string;
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items?: Array<any>;
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parser?: { value: any };
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}
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}
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}
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