зеркало из https://github.com/DeGsoft/maui-linux.git
397 строки
15 KiB
C#
397 строки
15 KiB
C#
//
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// XamlLoader.cs
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//
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// Author:
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// Stephane Delcroix <stephane@mi8.be>
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//
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// Copyright (c) 2013 Mobile Inception
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// Copyright (c) 2013-2014 Xamarin, Inc
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Text.RegularExpressions;
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using System.Xml;
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using Xamarin.Forms.Internals;
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using Xamarin.Forms.Xaml.Diagnostics;
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namespace Xamarin.Forms.Xaml.Internals
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{
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[Obsolete ("Replaced by ResourceLoader")]
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[EditorBrowsable(EditorBrowsableState.Never)]
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public static class XamlLoader
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{
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static Func<Type, string> xamlFileProvider;
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public static Func<Type, string> XamlFileProvider {
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get { return xamlFileProvider; }
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internal set {
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xamlFileProvider = value;
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Xamarin.Forms.DesignMode.IsDesignModeEnabled = true;
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//¯\_(ツ)_/¯ the previewer forgot to set that bool
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DoNotThrowOnExceptions = value != null;
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}
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}
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internal static bool DoNotThrowOnExceptions { get; set; }
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}
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}
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namespace Xamarin.Forms.Xaml
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{
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static class XamlLoader
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{
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public static void Load(object view, Type callingType)
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{
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var xaml = GetXamlForType(callingType, view, out var useDesignProperties);
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if (string.IsNullOrEmpty(xaml))
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throw new XamlParseException(string.Format("No embeddedresource found for {0}", callingType), new XmlLineInfo());
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Load(view, xaml, useDesignProperties);
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}
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public static void Load(object view, string xaml) => Load(view, xaml, false);
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public static void Load(object view, string xaml, bool useDesignProperties) => Load(view, xaml, null, useDesignProperties);
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public static void Load(object view, string xaml, Assembly rootAssembly) => Load(view, xaml, rootAssembly, false);
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public static void Load(object view, string xaml, Assembly rootAssembly, bool useDesignProperties)
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{
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using (var textReader = new StringReader(xaml))
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using (var reader = XmlReader.Create(textReader)) {
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while (reader.Read()) {
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//Skip until element
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if (reader.NodeType == XmlNodeType.Whitespace)
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continue;
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if (reader.NodeType == XmlNodeType.XmlDeclaration)
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continue;
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if (reader.NodeType != XmlNodeType.Element) {
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Debug.WriteLine("Unhandled node {0} {1} {2}", reader.NodeType, reader.Name, reader.Value);
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continue;
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}
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var rootnode = new RuntimeRootNode(new XmlType(reader.NamespaceURI, reader.Name, null), view, (IXmlNamespaceResolver)reader) { LineNumber = ((IXmlLineInfo)reader).LineNumber, LinePosition = ((IXmlLineInfo)reader).LinePosition };
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XamlParser.ParseXaml(rootnode, reader);
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#pragma warning disable 0618
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var doNotThrow = ResourceLoader.ExceptionHandler2 != null || Internals.XamlLoader.DoNotThrowOnExceptions;
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#pragma warning restore 0618
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void ehandler(Exception e) => ResourceLoader.ExceptionHandler2?.Invoke((e, XamlFilePathAttribute.GetFilePathForObject(view)));
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Visit(rootnode, new HydrationContext {
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RootElement = view,
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RootAssembly = rootAssembly ?? view.GetType().GetTypeInfo().Assembly,
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ExceptionHandler = doNotThrow ? ehandler : (Action<Exception>)null
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}, useDesignProperties);
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VisualDiagnostics.SendVisualTreeChanged(null, view);
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break;
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}
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}
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}
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public static object Create(string xaml, bool doNotThrow = false) => Create(xaml, doNotThrow, false);
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public static object Create(string xaml, bool doNotThrow, bool useDesignProperties)
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{
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doNotThrow = doNotThrow || ResourceLoader.ExceptionHandler2 != null;
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void ehandler(Exception e) => ResourceLoader.ExceptionHandler2?.Invoke((e, null));
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object inflatedView = null;
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using (var textreader = new StringReader(xaml))
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using (var reader = XmlReader.Create(textreader)) {
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while (reader.Read()) {
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//Skip until element
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if (reader.NodeType == XmlNodeType.Whitespace)
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continue;
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if (reader.NodeType == XmlNodeType.XmlDeclaration)
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continue;
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if (reader.NodeType != XmlNodeType.Element) {
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Debug.WriteLine("Unhandled node {0} {1} {2}", reader.NodeType, reader.Name, reader.Value);
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continue;
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}
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var typeArguments = XamlParser.GetTypeArguments(reader);
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var rootnode = new RuntimeRootNode(new XmlType(reader.NamespaceURI, reader.Name, typeArguments), null, (IXmlNamespaceResolver)reader) { LineNumber = ((IXmlLineInfo)reader).LineNumber, LinePosition = ((IXmlLineInfo)reader).LinePosition };
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XamlParser.ParseXaml(rootnode, reader);
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var visitorContext = new HydrationContext {
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ExceptionHandler = doNotThrow ? ehandler : (Action<Exception>)null,
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};
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var cvv = new CreateValuesVisitor(visitorContext);
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cvv.Visit((ElementNode)rootnode, null);
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inflatedView = rootnode.Root = visitorContext.Values[rootnode];
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visitorContext.RootElement = inflatedView as BindableObject;
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Visit(rootnode, visitorContext, useDesignProperties);
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VisualDiagnostics.SendVisualTreeChanged(null, inflatedView);
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break;
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}
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}
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return inflatedView;
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}
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public static IResourceDictionary LoadResources(string xaml, IResourcesProvider rootView)
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{
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void ehandler(Exception e) => ResourceLoader.ExceptionHandler2?.Invoke((e, XamlFilePathAttribute.GetFilePathForObject(rootView)));
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using (var textReader = new StringReader(xaml))
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using (var reader = XmlReader.Create(textReader)) {
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while (reader.Read()) {
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//Skip until element
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if (reader.NodeType == XmlNodeType.Whitespace)
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continue;
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if (reader.NodeType == XmlNodeType.XmlDeclaration)
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continue;
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if (reader.NodeType != XmlNodeType.Element) {
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Debug.WriteLine("Unhandled node {0} {1} {2}", reader.NodeType, reader.Name, reader.Value);
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continue;
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}
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//the root is set to null, and not to rootView, on purpose as we don't want to erase the current Resources of the view
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RootNode rootNode = new RuntimeRootNode(new XmlType(reader.NamespaceURI, reader.Name, null), null, (IXmlNamespaceResolver)reader) { LineNumber = ((IXmlLineInfo)reader).LineNumber, LinePosition = ((IXmlLineInfo)reader).LinePosition };
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XamlParser.ParseXaml(rootNode, reader);
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var rNode = (IElementNode)rootNode;
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if (!rNode.Properties.TryGetValue(new XmlName(XamlParser.XFUri, "Resources"), out var resources))
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return null;
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var visitorContext = new HydrationContext
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{
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ExceptionHandler = ResourceLoader.ExceptionHandler2 != null ? ehandler : (Action<Exception>)null,
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};
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var cvv = new CreateValuesVisitor(visitorContext);
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if (resources is ElementNode resourcesEN && (resourcesEN.XmlType.NamespaceUri != XamlParser.XFUri || resourcesEN.XmlType.Name != nameof(ResourceDictionary))) { //single implicit resource
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resources = new ElementNode(new XmlType(XamlParser.XFUri, nameof(ResourceDictionary), null), XamlParser.XFUri, rootNode.NamespaceResolver);
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((ElementNode)resources).CollectionItems.Add(resourcesEN);
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}
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else if (resources is ListNode resourcesLN) { //multiple implicit resources
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resources = new ElementNode(new XmlType(XamlParser.XFUri, nameof(ResourceDictionary), null), XamlParser.XFUri, rootNode.NamespaceResolver);
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foreach (var n in resourcesLN.CollectionItems)
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((ElementNode)resources).CollectionItems.Add(n);
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}
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cvv.Visit((ElementNode)resources, null);
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visitorContext.RootElement = rootView;
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resources.Accept(new XamlNodeVisitor((node, parent) => node.Parent = parent), null); //set parents for {StaticResource}
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resources.Accept(new ExpandMarkupsVisitor(visitorContext), null);
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resources.Accept(new PruneIgnoredNodesVisitor(false), null);
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resources.Accept(new NamescopingVisitor(visitorContext), null); //set namescopes for {x:Reference}
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resources.Accept(new CreateValuesVisitor(visitorContext), null);
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resources.Accept(new RegisterXNamesVisitor(visitorContext), null);
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resources.Accept(new FillResourceDictionariesVisitor(visitorContext), null);
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resources.Accept(new ApplyPropertiesVisitor(visitorContext, true), null);
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return visitorContext.Values[resources] as IResourceDictionary;
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}
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}
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return null;
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}
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static void Visit(RootNode rootnode, HydrationContext visitorContext, bool useDesignProperties)
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{
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rootnode.Accept(new XamlNodeVisitor((node, parent) => node.Parent = parent), null); //set parents for {StaticResource}
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rootnode.Accept(new ExpandMarkupsVisitor(visitorContext), null);
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rootnode.Accept(new PruneIgnoredNodesVisitor(useDesignProperties), null);
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if (useDesignProperties)
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rootnode.Accept(new RemoveDuplicateDesignNodes(), null);
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rootnode.Accept(new NamescopingVisitor(visitorContext), null); //set namescopes for {x:Reference}
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rootnode.Accept(new CreateValuesVisitor(visitorContext), null);
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rootnode.Accept(new RegisterXNamesVisitor(visitorContext), null);
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rootnode.Accept(new FillResourceDictionariesVisitor(visitorContext), null);
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rootnode.Accept(new ApplyPropertiesVisitor(visitorContext, true), null);
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}
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static string GetXamlForType(Type type, object instance, out bool useDesignProperties)
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{
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useDesignProperties = false;
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//the Previewer might want to provide it's own xaml for this... let them do that
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//the check at the end is preferred (using ResourceLoader). keep this until all the previewers are updated
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string xaml;
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#pragma warning disable 0618
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if (ResourceLoader.ResourceProvider2 == null && (xaml = Internals.XamlLoader.XamlFileProvider?.Invoke(type)) != null)
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return xaml;
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#pragma warning restore 0618
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var assembly = type.GetTypeInfo().Assembly;
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var resourceId = XamlResourceIdAttribute.GetResourceIdForType(type);
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var rlr = ResourceLoader.ResourceProvider2?.Invoke(new ResourceLoader.ResourceLoadingQuery {
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AssemblyName = assembly.GetName(),
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ResourcePath = XamlResourceIdAttribute.GetPathForType(type),
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Instance = instance,
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});
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var alternateXaml = rlr?.ResourceContent;
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if (alternateXaml != null) {
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useDesignProperties = rlr.UseDesignProperties;
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return alternateXaml;
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}
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if (resourceId == null)
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return LegacyGetXamlForType(type);
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using (var stream = assembly.GetManifestResourceStream(resourceId)) {
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if (stream != null)
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using (var reader = new StreamReader(stream))
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xaml = reader.ReadToEnd();
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else
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xaml = null;
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}
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return xaml;
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}
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//if the assembly was generated using a version of XamlG that doesn't outputs XamlResourceIdAttributes, we still need to find the resource, and load it
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static readonly Dictionary<Type, string> XamlResources = new Dictionary<Type, string>();
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static string LegacyGetXamlForType(Type type)
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{
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var assembly = type.GetTypeInfo().Assembly;
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string resourceId;
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if (XamlResources.TryGetValue(type, out resourceId)) {
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var result = ReadResourceAsXaml(type, assembly, resourceId);
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if (result != null)
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return result;
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}
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var likelyResourceName = type.Name + ".xaml";
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var resourceNames = assembly.GetManifestResourceNames();
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string resourceName = null;
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// first pass, pray to find it because the user named it correctly
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foreach (var resource in resourceNames) {
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if (ResourceMatchesFilename(assembly, resource, likelyResourceName)) {
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resourceName = resource;
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var xaml = ReadResourceAsXaml(type, assembly, resource);
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if (xaml != null)
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return xaml;
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}
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}
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// okay maybe they at least named it .xaml
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foreach (var resource in resourceNames) {
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if (!resource.EndsWith(".xaml", StringComparison.OrdinalIgnoreCase))
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continue;
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resourceName = resource;
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var xaml = ReadResourceAsXaml(type, assembly, resource);
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if (xaml != null)
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return xaml;
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}
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foreach (var resource in resourceNames) {
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if (resource.EndsWith(".xaml", StringComparison.OrdinalIgnoreCase))
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continue;
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resourceName = resource;
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var xaml = ReadResourceAsXaml(type, assembly, resource, true);
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if (xaml != null)
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return xaml;
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}
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return null;
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}
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//legacy...
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static bool ResourceMatchesFilename(Assembly assembly, string resource, string filename)
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{
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try {
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var info = assembly.GetManifestResourceInfo(resource);
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if (!string.IsNullOrEmpty(info.FileName) &&
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string.Compare(info.FileName, filename, StringComparison.OrdinalIgnoreCase) == 0)
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return true;
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}
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catch (PlatformNotSupportedException) {
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// Because Win10 + .NET Native
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}
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if (resource.EndsWith("." + filename, StringComparison.OrdinalIgnoreCase) ||
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string.Compare(resource, filename, StringComparison.OrdinalIgnoreCase) == 0)
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return true;
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return false;
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}
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//part of the legacy as well...
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static string ReadResourceAsXaml(Type type, Assembly assembly, string likelyTargetName, bool validate = false)
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{
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using (var stream = assembly.GetManifestResourceStream(likelyTargetName))
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using (var reader = new StreamReader(stream)) {
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if (validate) {
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// terrible validation of XML. Unfortunately it will probably work most of the time since comments
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// also start with a <. We can't bring in any real deps.
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var firstNonWhitespace = (char)reader.Read();
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while (char.IsWhiteSpace(firstNonWhitespace))
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firstNonWhitespace = (char)reader.Read();
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if (firstNonWhitespace != '<')
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return null;
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stream.Seek(0, SeekOrigin.Begin);
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}
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var xaml = reader.ReadToEnd();
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var pattern = String.Format("x:Class *= *\"{0}\"", type.FullName);
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var regex = new Regex(pattern, RegexOptions.ECMAScript);
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if (regex.IsMatch(xaml) || xaml.Contains(String.Format("x:Class=\"{0}\"", type.FullName)))
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return xaml;
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}
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return null;
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}
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public class RuntimeRootNode : RootNode
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{
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public RuntimeRootNode(XmlType xmlType, object root, IXmlNamespaceResolver resolver) : base(xmlType, resolver)
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{
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Root = root;
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}
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public object Root { get; internal set; }
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}
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public struct FallbackTypeInfo
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{
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public string ClrNamespace { get; internal set; }
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public string TypeName { get; internal set; }
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public string AssemblyName { get; internal set; }
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public string XmlNamespace { get; internal set; }
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}
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public struct CallbackTypeInfo
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{
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public string XmlNamespace { get; internal set; }
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public string XmlTypeName { get; internal set; }
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}
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internal static Func<IList<FallbackTypeInfo>, Type, Type> FallbackTypeResolver { get; set; }
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internal static Action<CallbackTypeInfo, object> ValueCreatedCallback { get; set; }
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internal static Func<CallbackTypeInfo, Type, Exception, object> InstantiationFailedCallback { get; set; }
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}
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} |