mirror of
https://github.com/NativeScript/NativeScript.git
synced 2025-11-05 13:26:48 +08:00
Refactoring ui/builder and template builder to preserve source information for templates
This commit is contained in:
Panayot Cankov
@@ -3,24 +3,13 @@ import fs = require("file-system");
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import xml = require("xml");
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import types = require("utils/types");
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import componentBuilder = require("ui/builder/component-builder");
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import templateBuilderDef = require("ui/builder/template-builder");
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import platform = require("platform");
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import definition = require("ui/builder");
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import page = require("ui/page");
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import fileResolverModule = require("file-system/file-name-resolver");
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import trace = require("trace");
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import debug = require("utils/debug");
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var KNOWNCOLLECTIONS = "knownCollections";
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function isPlatform(value: string): boolean {
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return value && (value.toLowerCase() === platform.platformNames.android.toLowerCase()
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|| value.toLowerCase() === platform.platformNames.ios.toLowerCase());
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}
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function isCurentPlatform(value: string): boolean {
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return value && value.toLowerCase() === platform.device.os.toLowerCase();
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}
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import builder = require("ui/builder");
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export function parse(value: string | view.Template, context: any): view.View {
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if (types.isString(value)) {
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@@ -43,164 +32,19 @@ export function parse(value: string | view.Template, context: any): view.View {
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}
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function parseInternal(value: string, context: any, uri?: string): componentBuilder.ComponentModule {
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var currentPage: page.Page;
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var rootComponentModule: componentBuilder.ComponentModule;
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// Temporary collection used for parent scope.
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var parents = new Array<componentBuilder.ComponentModule>();
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var complexProperties = new Array<ComplexProperty>();
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var start: xml2ui.XmlStringParser;
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var ui: xml2ui.ComponentParser;
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var errorFormat = (debug.debug && uri) ? xml2ui.SourceErrorFormat(uri) : xml2ui.PositionErrorFormat;
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(start = new xml2ui.XmlStringParser(errorFormat))
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.pipe(new xml2ui.PlatformFilter())
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.pipe(new xml2ui.XmlStateParser(ui = new xml2ui.ComponentParser(context, errorFormat)));
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var templateBuilder: templateBuilderDef.TemplateBuilder;
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start.parse(value);
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var currentPlatformContext: string;
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var wrapSource: (e: Error, p: xml.Position) => Error;
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if (debug.debug && uri) {
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wrapSource = (e: Error, p: xml.Position) => {
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var source = new debug.Source(uri, p.line, p.column);
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e = new debug.SourceError(e, source, "Building UI from XML.");
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return e;
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}
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} else {
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wrapSource = e => e; // no-op identity
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}
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// Parse the XML.
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var xmlParser = new xml.XmlParser((args: xml.ParserEvent) => {
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try {
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if (args.eventType === xml.ParserEventType.StartElement) {
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if (isPlatform(args.elementName)) {
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if (currentPlatformContext) {
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throw new Error("Already in '" + currentPlatformContext + "' platform context and cannot switch to '" + args.elementName + "' platform! Platform tags cannot be nested.");
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}
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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 (isPlatform(args.elementName)) {
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currentPlatformContext = undefined;
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return;
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}
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}
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if (currentPlatformContext && !isCurentPlatform(currentPlatformContext)) {
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return;
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}
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if (templateBuilder) {
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var finished = templateBuilder.handleElement(args);
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if (finished) {
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// Clean-up and continnue
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templateBuilder = undefined;
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}
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else {
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// Skip processing untill the template builder finishes his job.
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return;
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}
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}
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// Get the current parent.
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var parent = parents[parents.length - 1];
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var complexProperty = complexProperties[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 (isComplexProperty(args.elementName)) {
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var name = getComplexProperty(args.elementName);
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complexProperties.push({
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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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if (templateBuilderDef.isKnownTemplate(name, parent.exports)) {
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templateBuilder = new templateBuilderDef.TemplateBuilder({
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context: parent ? getExports(parent.component) : null, // Passing 'context' won't work if you set "codeFile" on the page
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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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});
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}
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} else {
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var componentModule: componentBuilder.ComponentModule;
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if (args.prefix && args.namespace) {
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// Custom components
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componentModule = loadCustomComponent(args.namespace, args.elementName, args.attributes, context, currentPage);
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} else {
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// Default components
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componentModule = componentBuilder.getComponentModule(args.elementName, args.namespace, args.attributes, context);
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}
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if (componentModule) {
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if (parent) {
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if (componentModule.component instanceof view.View) {
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if (complexProperty) {
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// Add to complex property to component.
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addToComplexProperty(parent, complexProperty, componentModule)
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} else if ((<any>parent.component)._addChildFromBuilder) {
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// Add component to visual tree
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(<any>parent.component)._addChildFromBuilder(args.elementName, componentModule.component);
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}
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} else if (complexProperty) {
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// Add component to complex property of parent component.
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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 (parents.length === 0) {
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// Set root component.
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rootComponentModule = componentModule;
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if (rootComponentModule && rootComponentModule.component instanceof page.Page) {
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currentPage = <page.Page>rootComponentModule.component;
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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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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 (isComplexProperty(args.elementName)) {
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if (complexProperty) {
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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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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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parents.pop();
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}
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}
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} catch(e) {
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throw wrapSource(e, args.position);
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}
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}, (e, p) => {
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throw wrapSource(new Error("XML parse error: " + e.message), p);
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}, true);
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if (types.isString(value)) {
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value = value.replace(/xmlns=("|')http:\/\/((www)|(schemas))\.nativescript\.org\/tns\.xsd\1/, "");
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xmlParser.parse(value);
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}
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return rootComponentModule;
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return ui.rootComponentModule;
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}
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function loadCustomComponent(componentPath: string, componentName?: string, attributes?: Object, context?: Object, parentPage?: page.Page): componentBuilder.ComponentModule {
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@@ -297,44 +141,6 @@ function loadInternal(fileName: string, context?: any): componentBuilder.Compone
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return componentModule;
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}
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function isComplexProperty(name: string): boolean {
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return types.isString(name) && name.indexOf(".") !== -1;
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}
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function getComplexProperty(fullName: string): string {
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var name: string;
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if (types.isString(fullName)) {
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var 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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function isKnownCollection(name: string, context: any): boolean {
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return KNOWNCOLLECTIONS in context && context[KNOWNCOLLECTIONS] && name in context[KNOWNCOLLECTIONS];
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}
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function addToComplexProperty(parent: componentBuilder.ComponentModule, complexProperty: ComplexProperty, elementModule: componentBuilder.ComponentModule) {
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// If property name is known collection we populate array with elements.
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var parentComponent = <any>parent.component;
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if (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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interface ComplexProperty {
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parent: componentBuilder.ComponentModule;
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name: string;
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items?: Array<any>;
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}
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function getExports(instance: view.View): any {
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var parent = instance.parent;
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@@ -344,3 +150,400 @@ function getExports(instance: view.View): any {
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return parent ? (<any>parent).exports : undefined;
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}
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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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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: string) {
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var xmlParser = new xml.XmlParser((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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}, (e, p) => {
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throw this.error(e, p);
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}, true);
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if (types.isString(value)) {
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value = value.replace(/xmlns=("|')http:\/\/((www)|(schemas))\.nativescript\.org\/tns\.xsd\1/, "");
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xmlParser.parse(value);
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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 debug.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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var source = new debug.Source(uri, p.line, p.column);
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e = new debug.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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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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return value && (value.toLowerCase() === platform.platformNames.android.toLowerCase()
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|| value.toLowerCase() === platform.platformNames.ios.toLowerCase());
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}
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private static isCurentPlatform(value: string): boolean {
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return value && value.toLowerCase() === platform.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: componentBuilder.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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}
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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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constructor(parent: XmlStateConsumer, templateProperty: TemplateProperty) {
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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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}
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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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||||
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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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||||
|
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this._nestingLevel--;
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||||
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||||
if (this._nestingLevel === 0) {
|
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this._state = TemplateParser.State.FINISHED;
|
||||
this.build();
|
||||
}
|
||||
}
|
||||
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||||
private build() {
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||||
if (this._templateProperty.name in this._templateProperty.parent.component) {
|
||||
var context = this._context;
|
||||
var errorFormat = this._templateProperty.errorFormat;
|
||||
var template: view.Template = () => {
|
||||
var start: xml2ui.XmlArgsReplay;
|
||||
var ui: xml2ui.ComponentParser;
|
||||
|
||||
(start = new xml2ui.XmlArgsReplay(this._recordedXmlStream, errorFormat))
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||||
// No platform filter, it has been filtered allready
|
||||
.pipe(new XmlStateParser(ui = new ComponentParser(context, errorFormat)));
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||||
|
||||
start.replay();
|
||||
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||||
return ui.rootComponentModule.component;
|
||||
}
|
||||
this._templateProperty.parent.component[this._templateProperty.name] = template;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
export namespace TemplateParser {
|
||||
export const enum State {
|
||||
EXPECTING_START,
|
||||
PARSING,
|
||||
FINISHED
|
||||
}
|
||||
}
|
||||
|
||||
export class ComponentParser implements XmlStateConsumer {
|
||||
|
||||
private static KNOWNCOLLECTIONS = "knownCollections";
|
||||
private static KNOWNTEMPLATES = "knownTemplates";
|
||||
|
||||
public rootComponentModule: componentBuilder.ComponentModule;
|
||||
|
||||
private context: any;
|
||||
|
||||
private currentPage: page.Page;
|
||||
private parents = new Array<componentBuilder.ComponentModule>();
|
||||
private complexProperties = new Array<ComponentParser.ComplexProperty>();
|
||||
|
||||
private error;
|
||||
|
||||
constructor(context: any, errorFormat: ErrorFormatter) {
|
||||
this.context = context;
|
||||
this.error = errorFormat;
|
||||
}
|
||||
|
||||
public parse(args: xml.ParserEvent): XmlStateConsumer {
|
||||
|
||||
// Get the current parent.
|
||||
var parent = this.parents[this.parents.length - 1];
|
||||
var complexProperty = this.complexProperties[this.complexProperties.length - 1];
|
||||
|
||||
// Create component instance from every element declaration.
|
||||
if (args.eventType === xml.ParserEventType.StartElement) {
|
||||
if (ComponentParser.isComplexProperty(args.elementName)) {
|
||||
|
||||
var name = ComponentParser.getComplexPropertyName(args.elementName);
|
||||
|
||||
this.complexProperties.push({
|
||||
parent: parent,
|
||||
name: name,
|
||||
items: [],
|
||||
});
|
||||
|
||||
if (ComponentParser.isKnownTemplate(name, parent.exports)) {
|
||||
return new TemplateParser(this, {
|
||||
context: parent ? getExports(parent.component) : null, // Passing 'context' won't work if you set "codeFile" on the page
|
||||
parent: parent,
|
||||
name: name,
|
||||
elementName: args.elementName,
|
||||
templateItems: [],
|
||||
errorFormat: this.error
|
||||
});
|
||||
}
|
||||
|
||||
} else {
|
||||
|
||||
var componentModule: componentBuilder.ComponentModule;
|
||||
|
||||
if (args.prefix && args.namespace) {
|
||||
// Custom components
|
||||
componentModule = loadCustomComponent(args.namespace, args.elementName, args.attributes, this.context, this.currentPage);
|
||||
} else {
|
||||
// Default components
|
||||
componentModule = componentBuilder.getComponentModule(args.elementName, args.namespace, args.attributes, this.context);
|
||||
}
|
||||
|
||||
if (componentModule) {
|
||||
if (parent) {
|
||||
if (complexProperty) {
|
||||
// Add component to complex property of parent component.
|
||||
ComponentParser.addToComplexProperty(parent, complexProperty, componentModule);
|
||||
} else if ((<any>parent.component)._addChildFromBuilder) {
|
||||
(<any>parent.component)._addChildFromBuilder(args.elementName, componentModule.component);
|
||||
}
|
||||
} else if (this.parents.length === 0) {
|
||||
// Set root component.
|
||||
this.rootComponentModule = componentModule;
|
||||
|
||||
if (this.rootComponentModule && this.rootComponentModule.component instanceof page.Page) {
|
||||
this.currentPage = <page.Page>this.rootComponentModule.component;
|
||||
}
|
||||
}
|
||||
|
||||
// Add the component instance to the parents scope collection.
|
||||
this.parents.push(componentModule);
|
||||
}
|
||||
}
|
||||
|
||||
} else if (args.eventType === xml.ParserEventType.EndElement) {
|
||||
if (ComponentParser.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).
|
||||
this.complexProperties.pop();
|
||||
|
||||
} else {
|
||||
// Remove the last parent from the parents collection (move to the previous parent scope).
|
||||
this.parents.pop();
|
||||
}
|
||||
}
|
||||
|
||||
return this;
|
||||
}
|
||||
|
||||
private static isComplexProperty(name: string): boolean {
|
||||
return types.isString(name) && name.indexOf(".") !== -1;
|
||||
}
|
||||
|
||||
private static getComplexPropertyName(fullName: string): string {
|
||||
var name: string;
|
||||
|
||||
if (types.isString(fullName)) {
|
||||
var names = fullName.split(".");
|
||||
name = names[names.length - 1];
|
||||
}
|
||||
|
||||
return name;
|
||||
}
|
||||
|
||||
private static isKnownTemplate(name: string, exports: any): boolean {
|
||||
return ComponentParser.KNOWNTEMPLATES in exports && exports[ComponentParser.KNOWNTEMPLATES] && name in exports[ComponentParser.KNOWNTEMPLATES];
|
||||
}
|
||||
|
||||
private static addToComplexProperty(parent: componentBuilder.ComponentModule, complexProperty: ComponentParser.ComplexProperty, elementModule: componentBuilder.ComponentModule) {
|
||||
// If property name is known collection we populate array with elements.
|
||||
var parentComponent = <any>parent.component;
|
||||
if (ComponentParser.isKnownCollection(complexProperty.name, parent.exports)) {
|
||||
complexProperty.items.push(elementModule.component);
|
||||
} else if (parentComponent._addChildFromBuilder) {
|
||||
parentComponent._addChildFromBuilder(complexProperty.name, elementModule.component);
|
||||
} else {
|
||||
// Or simply assign the value;
|
||||
parentComponent[complexProperty.name] = elementModule.component;
|
||||
}
|
||||
}
|
||||
|
||||
private static isKnownCollection(name: string, context: any): boolean {
|
||||
return ComponentParser.KNOWNCOLLECTIONS in context && context[ComponentParser.KNOWNCOLLECTIONS] && name in context[ComponentParser.KNOWNCOLLECTIONS];
|
||||
}
|
||||
}
|
||||
|
||||
export namespace ComponentParser {
|
||||
export interface ComplexProperty {
|
||||
parent: componentBuilder.ComponentModule;
|
||||
name: string;
|
||||
items?: Array<any>;
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user