зеркало из https://github.com/DeGsoft/maui-linux.git
403 строки
13 KiB
C#
403 строки
13 KiB
C#
//
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// XamlParser.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.Diagnostics;
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using System.Linq;
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using System.Reflection;
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using System.Xml;
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using Xamarin.Forms.Internals;
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namespace Xamarin.Forms.Xaml
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{
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static class XamlParser
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{
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public static void ParseXaml(RootNode rootNode, XmlReader reader)
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{
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IList<KeyValuePair<string, string>> xmlns;
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var attributes = ParseXamlAttributes(reader, out xmlns);
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var prefixes = PrefixesToIgnore(xmlns);
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(rootNode.IgnorablePrefixes ?? (rootNode.IgnorablePrefixes=new List<string>())).AddRange(prefixes);
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rootNode.Properties.AddRange(attributes);
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ParseXamlElementFor(rootNode, reader);
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}
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static void ParseXamlElementFor(IElementNode node, XmlReader reader)
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{
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Debug.Assert(reader.NodeType == XmlNodeType.Element);
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var elementName = reader.Name;
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var isEmpty = reader.IsEmptyElement;
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if (isEmpty)
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return;
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while (reader.Read())
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{
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switch (reader.NodeType)
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{
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case XmlNodeType.EndElement:
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Debug.Assert(reader.Name == elementName); //make sure we close the right element
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return;
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case XmlNodeType.Element:
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// 1. Property Element.
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if (reader.Name.Contains("."))
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{
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XmlName name;
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if (reader.Name.StartsWith(elementName + ".", StringComparison.Ordinal))
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name = new XmlName(reader.NamespaceURI, reader.Name.Substring(elementName.Length + 1));
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else //Attached DP
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name = new XmlName(reader.NamespaceURI, reader.LocalName);
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var prop = ReadNode(reader);
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if (prop != null)
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node.Properties.Add(name, prop);
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}
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// 2. Xaml2009 primitives, x:Arguments, ...
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else if (reader.NamespaceURI == "http://schemas.microsoft.com/winfx/2009/xaml" && reader.LocalName == "Arguments")
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{
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var prop = ReadNode(reader);
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if (prop != null)
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node.Properties.Add(XmlName.xArguments, prop);
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}
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// 3. DataTemplate (should be handled by 4.)
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else if (node.XmlType.NamespaceUri == "http://xamarin.com/schemas/2014/forms" &&
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(node.XmlType.Name == "DataTemplate" || node.XmlType.Name == "ControlTemplate"))
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{
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var prop = ReadNode(reader, true);
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if (prop != null)
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node.Properties.Add(XmlName._CreateContent, prop);
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}
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// 4. Implicit content, implicit collection, or collection syntax. Add to CollectionItems, resolve case later.
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else
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{
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var item = ReadNode(reader, true);
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if (item != null)
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node.CollectionItems.Add(item);
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}
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break;
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case XmlNodeType.Whitespace:
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break;
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case XmlNodeType.Text:
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case XmlNodeType.CDATA:
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if (node.CollectionItems.Count == 1 && node.CollectionItems[0] is ValueNode)
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((ValueNode)node.CollectionItems[0]).Value += reader.Value.Trim();
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else
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node.CollectionItems.Add(new ValueNode(reader.Value.Trim(), (IXmlNamespaceResolver)reader));
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break;
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default:
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Debug.WriteLine("Unhandled node {0} {1} {2}", reader.NodeType, reader.Name, reader.Value);
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break;
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}
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}
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}
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static INode ReadNode(XmlReader reader, bool nested = false)
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{
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var skipFirstRead = nested;
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Debug.Assert(reader.NodeType == XmlNodeType.Element);
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var name = reader.Name;
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List<INode> nodes = new List<INode>();
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INode node = null;
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while (skipFirstRead || reader.Read())
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{
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skipFirstRead = false;
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switch (reader.NodeType)
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{
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case XmlNodeType.EndElement:
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Debug.Assert(reader.Name == name);
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if (nodes.Count == 0) //Empty element
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return null;
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if (nodes.Count == 1)
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return nodes[0];
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return new ListNode(nodes, (IXmlNamespaceResolver)reader, ((IXmlLineInfo)reader).LineNumber,
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((IXmlLineInfo)reader).LinePosition);
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case XmlNodeType.Element:
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var isEmpty = reader.IsEmptyElement && reader.Name == name;
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var elementName = reader.Name;
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var elementNsUri = reader.NamespaceURI;
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var elementXmlInfo = (IXmlLineInfo)reader;
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IList<KeyValuePair<string, string>> xmlns;
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var attributes = ParseXamlAttributes(reader, out xmlns);
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var prefixes = PrefixesToIgnore(xmlns);
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IList<XmlType> typeArguments = null;
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if (attributes.Any(kvp => kvp.Key == XmlName.xTypeArguments))
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{
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typeArguments =
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((ValueNode)attributes.First(kvp => kvp.Key == XmlName.xTypeArguments).Value).Value as IList<XmlType>;
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}
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node = new ElementNode(new XmlType(elementNsUri, elementName, typeArguments), elementNsUri,
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reader as IXmlNamespaceResolver, elementXmlInfo.LineNumber, elementXmlInfo.LinePosition);
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((IElementNode)node).Properties.AddRange(attributes);
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(node.IgnorablePrefixes ?? (node.IgnorablePrefixes = new List<string>())).AddRange(prefixes);
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ParseXamlElementFor((IElementNode)node, reader);
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nodes.Add(node);
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if (isEmpty || nested)
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return node;
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break;
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case XmlNodeType.Text:
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node = new ValueNode(reader.Value.Trim(), (IXmlNamespaceResolver)reader, ((IXmlLineInfo)reader).LineNumber,
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((IXmlLineInfo)reader).LinePosition);
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nodes.Add(node);
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break;
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case XmlNodeType.Whitespace:
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break;
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default:
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Debug.WriteLine("Unhandled node {0} {1} {2}", reader.NodeType, reader.Name, reader.Value);
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break;
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}
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}
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throw new XamlParseException("Closing PropertyElement expected", (IXmlLineInfo)reader);
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}
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static IList<KeyValuePair<XmlName, INode>> ParseXamlAttributes(XmlReader reader, out IList<KeyValuePair<string,string>> xmlns)
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{
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Debug.Assert(reader.NodeType == XmlNodeType.Element);
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var attributes = new List<KeyValuePair<XmlName, INode>>();
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xmlns = new List<KeyValuePair<string, string>>();
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for (var i = 0; i < reader.AttributeCount; i++)
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{
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reader.MoveToAttribute(i);
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//skip xmlns
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if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/") {
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xmlns.Add(new KeyValuePair<string, string>(reader.LocalName, reader.Value));
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continue;
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}
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var namespaceUri = reader.NamespaceURI;
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if (reader.LocalName.Contains(".") && namespaceUri == "")
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namespaceUri = ((IXmlNamespaceResolver)reader).LookupNamespace("");
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var propertyName = new XmlName(namespaceUri, reader.LocalName);
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object value = reader.Value;
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if (reader.NamespaceURI == "http://schemas.microsoft.com/winfx/2006/xaml")
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{
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switch (reader.Name) {
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case "x:Key":
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propertyName = XmlName.xKey;
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break;
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case "x:Name":
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propertyName = XmlName.xName;
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break;
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case "x:Class":
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case "x:FieldModifier":
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continue;
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default:
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Debug.WriteLine("Unhandled attribute {0}", reader.Name);
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continue;
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}
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}
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if (reader.NamespaceURI == "http://schemas.microsoft.com/winfx/2009/xaml")
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{
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switch (reader.Name) {
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case "x:Key":
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propertyName = XmlName.xKey;
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break;
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case "x:Name":
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propertyName = XmlName.xName;
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break;
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case "x:TypeArguments":
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propertyName = XmlName.xTypeArguments;
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value = TypeArgumentsParser.ParseExpression((string)value, (IXmlNamespaceResolver)reader, (IXmlLineInfo)reader);
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break;
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case "x:DataType":
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propertyName = XmlName.xDataType;
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break;
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case "x:Class":
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case "x:FieldModifier":
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continue;
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case "x:FactoryMethod":
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propertyName = XmlName.xFactoryMethod;
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break;
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case "x:Arguments":
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propertyName = XmlName.xArguments;
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break;
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default:
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Debug.WriteLine("Unhandled attribute {0}", reader.Name);
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continue;
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}
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}
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var propertyNode = GetValueNode(value, reader);
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attributes.Add(new KeyValuePair<XmlName, INode>(propertyName, propertyNode));
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}
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reader.MoveToElement();
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return attributes;
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}
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static IList<string> PrefixesToIgnore(IList<KeyValuePair<string, string>> xmlns)
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{
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var prefixes = new List<string>();
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foreach (var kvp in xmlns) {
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var prefix = kvp.Key;
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string typeName = null, ns = null, asm = null, targetPlatform = null;
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XmlnsHelper.ParseXmlns(kvp.Value, out typeName, out ns, out asm, out targetPlatform);
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if (targetPlatform == null)
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continue;
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try {
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if (targetPlatform != Device.RuntimePlatform)
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{
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// Special case for Windows backward compatibility
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if (targetPlatform == "Windows" &&
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(Device.RuntimePlatform == Device.UWP || Device.RuntimePlatform == Device.WinRT))
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continue;
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prefixes.Add(prefix);
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}
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} catch (InvalidOperationException) {
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prefixes.Add(prefix);
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}
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}
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return prefixes;
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}
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static IValueNode GetValueNode(object value, XmlReader reader)
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{
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var valueString = value as string;
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if (valueString != null && valueString.Trim().StartsWith("{}", StringComparison.Ordinal))
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{
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return new ValueNode(valueString.Substring(2), (IXmlNamespaceResolver)reader, ((IXmlLineInfo)reader).LineNumber,
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((IXmlLineInfo)reader).LinePosition);
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}
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if (valueString != null && valueString.Trim().StartsWith("{", StringComparison.Ordinal))
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{
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return new MarkupNode(valueString.Trim(), reader as IXmlNamespaceResolver, ((IXmlLineInfo)reader).LineNumber,
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((IXmlLineInfo)reader).LinePosition);
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}
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return new ValueNode(value, (IXmlNamespaceResolver)reader, ((IXmlLineInfo)reader).LineNumber,
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((IXmlLineInfo)reader).LinePosition);
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}
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static IList<XmlnsDefinitionAttribute> s_xmlnsDefinitions;
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static void GatherXmlnsDefinitionAttributes()
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{
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//this could be extended to look for [XmlnsDefinition] in all assemblies
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var assemblies = new [] {
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typeof(View).GetTypeInfo().Assembly,
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typeof(XamlLoader).GetTypeInfo().Assembly,
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};
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s_xmlnsDefinitions = new List<XmlnsDefinitionAttribute>();
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foreach (var assembly in assemblies)
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foreach (XmlnsDefinitionAttribute attribute in assembly.GetCustomAttributes(typeof(XmlnsDefinitionAttribute))) {
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s_xmlnsDefinitions.Add(attribute);
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attribute.AssemblyName = attribute.AssemblyName ?? assembly.FullName;
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}
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}
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public static Type GetElementType(XmlType xmlType, IXmlLineInfo xmlInfo, Assembly currentAssembly,
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out XamlParseException exception)
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{
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if (s_xmlnsDefinitions == null)
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GatherXmlnsDefinitionAttributes();
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var namespaceURI = xmlType.NamespaceUri;
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var elementName = xmlType.Name;
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var typeArguments = xmlType.TypeArguments;
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exception = null;
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var lookupAssemblies = new List<XmlnsDefinitionAttribute>();
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var lookupNames = new List<string>();
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foreach (var xmlnsDef in s_xmlnsDefinitions) {
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if (xmlnsDef.XmlNamespace != namespaceURI)
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continue;
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lookupAssemblies.Add(xmlnsDef);
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}
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if (lookupAssemblies.Count == 0) {
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string ns, asmstring, _;
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XmlnsHelper.ParseXmlns(namespaceURI, out _, out ns, out asmstring, out _);
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lookupAssemblies.Add(new XmlnsDefinitionAttribute(namespaceURI, ns) {
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AssemblyName = asmstring ?? currentAssembly.FullName
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});
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}
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lookupNames.Add(elementName);
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lookupNames.Add(elementName + "Extension");
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for (var i = 0; i < lookupNames.Count; i++)
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{
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var name = lookupNames[i];
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if (name.Contains(":"))
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name = name.Substring(name.LastIndexOf(':') + 1);
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if (typeArguments != null)
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name += "`" + typeArguments.Count; //this will return an open generic Type
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lookupNames[i] = name;
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}
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Type type = null;
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foreach (var asm in lookupAssemblies) {
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foreach (var name in lookupNames)
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if ((type = Type.GetType($"{asm.ClrNamespace}.{name}, {asm.AssemblyName}")) != null)
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break;
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if (type != null)
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break;
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}
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if (type != null && typeArguments != null)
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{
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XamlParseException innerexception = null;
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var args = typeArguments.Select(delegate(XmlType xmltype)
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{
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XamlParseException xpe;
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var t = GetElementType(xmltype, xmlInfo, currentAssembly, out xpe);
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if (xpe != null)
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{
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innerexception = xpe;
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return null;
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}
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return t;
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}).ToArray();
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if (innerexception != null)
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{
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exception = innerexception;
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return null;
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}
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type = type.MakeGenericType(args);
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}
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if (type == null)
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exception = new XamlParseException($"Type {elementName} not found in xmlns {namespaceURI}", xmlInfo);
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return type;
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}
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}
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} |