Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Markup / XamlTreeBuilder.cs / 2 / XamlTreeBuilder.cs
/****************************************************************************\ * * File: XamlTreeBuilder.cs * * Purpose: Class that builds a tree from XAML * * History: * 6/06/01: rogerg Created * 5/29/03: [....] Ported to wcp * * Copyright (C) 2003 by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using System; using System.Xml; using System.IO; using System.Windows; using System.Text; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Reflection; using System.Windows.Threading; using MS.Utility; #if PBTCOMPILER namespace MS.Internal.Markup #else namespace System.Windows.Markup #endif { ////// XamlTree builder is the TreeBuilder implementation that loads a Tree /// from XAML. /// internal class XamlTreeBuilder : TreeBuilder { #region Constructors ////// Constructor /// /// ParserContext to Use /// XmlReader input /// Should wrap 'reader' with an XML Compatibility Reader /// Xaml parse mode internal XamlTreeBuilder( ParserContext parserContext, XmlReader reader, bool wrapWithMarkupCompatReader, XamlParseMode parseMode) : base() { Debug.Assert(null != parserContext, "ParserContext is null"); Debug.Assert(null != reader, "TextReader input is null"); Debug.Assert(null != parserContext.XamlTypeMapper, "ParserContext XamlTypeMapper is null"); XamlParser xamlParser = new TreeBuilderXamlTranslator(this, parserContext, reader, wrapWithMarkupCompatReader, parseMode); Initialize(parserContext, xamlParser); } ////// Constructor /// /// ParserContext /// input Stream containing the XAML /// Xaml parse mode internal XamlTreeBuilder( ParserContext parserContext, Stream stream, XamlParseMode parseMode) : base() { Debug.Assert(null != parserContext, "ParserContext is null"); Debug.Assert(null != stream, "xamlStream is null"); Debug.Assert(null != parserContext.XamlTypeMapper, "ParserContext XamlTypeMapper is null"); XamlParser parser = new TreeBuilderXamlTranslator(this, parserContext, stream, parseMode); Initialize(parserContext, parser); } ////// Constructor /// ////// This constructor is used by sub-classes like /// StyleXamltreeBuilder or TemplateXamlTreeBuilder. /// internal XamlTreeBuilder() : base() { } #endregion Constructors #region Overrides // overrides from the base treebuilder class ////// Internal Avalon method. Used to parse a BAML file. /// ///An array containing the root objects in the XAML stream public override object ParseFragment() { // setup the ParserHooks // !!! set this up before asking for the parser mode because // the parser mode will always force sync for now if the ParserHooks is set. _xamlParser.ParserHooks = ParserHooks; // Determine the Parse Mode by parsing the first element tag. Note that // we don't want to build the tree top down until we figure out the sync // mode because of wierd dependencies on the RootList. RecordReader.BuildTopDown = false; XamlParseMode = _xamlParser.GetParseMode(); RecordReader.BuildTopDown = true; // Should this just silently set MultipleRoots to false? if(!((XamlParseMode.Synchronous == XamlParseMode)|| !MultipleRoots)) { throw new ApplicationException(SR.Get(SRID.ParserMultiRoot)); } // if Parse() is called when loading from XAML just turn around and call // the XamlParser. if (Dispatcher.CurrentDispatcher != null) { // Turn off property invalidation by using DependencyFastBuild. This // creation-mode mechanism should only be used when building a tree // in isolation //using (DependencyFastBuild.Start()) { _xamlParser.Parse(); } } else { _xamlParser.Parse(); } // its okay for root to be null if its an empty file or the parse // was stopped. return GetRoot(); } #endregion Overrides #region Methods ////// Stops a parse and throws an exception on the TreeBuilder thread if in /// asynchronous mode /// /// Exception internal void XamlTreeBuildError(Exception e) { ParseException = e; } ////// Called when the Parser is Cancelled before the /// Tree has been completely built. /// internal void XamlTreeBuildCancel() { ParseCancelled = true; } // internal function for doing any cleanup immediately following // the tree being complete. internal override void TreeBuildComplete() { if (ParseCompleted != null) { // Fire the ParseCompleted event asynchronously Dispatcher.CurrentDispatcher.BeginInvoke( DispatcherPriority.Normal, (DispatcherOperationCallback) delegate(object obj) { ParseCompleted(this, EventArgs.Empty); return null; }, null); } } ////// This event is fired when the parse is complete /// internal event EventHandler ParseCompleted; ////// Callback in when a new record has been created from the parse /// Builder can either immediately use the record "sync mode" /// or false can be returned to indicate that the record was not /// processed and should be written to BAML. /// /// bamlRecord to process /// line number in associated xaml file /// offset from left margin in associated xaml file ///true if record was handled internal bool BamlRecordWriterSyncUpdate( BamlRecord bamlRecord, int lineNumber, int linePosition) { bool bamlRecordHandled = true; // !!!! this code relies on the XamlParser sitting on the UIThread // until we get a root. Therefore XamlParser can't go async until // after it has finished parsing the root. // !!! Todo: This code needs to be reworked when get async binding support // since in async we wouldn't need to sit in a loop to build the root. if (XamlParseMode != XamlParseMode.Asynchronous || GetRoot() == null) { Debug.Assert(false == RecordReader.EndOfDocument); // shouldn't be called after end // call read passing in the bamlRecord RecordReader.Read(bamlRecord, lineNumber, linePosition); // if found the endOfDocument record then mark as complete. // !!Review, what if we never get an EndOfDocument. if (RecordReader.EndOfDocument) { TreeBuildComplete(); } else { // if got a root we are going to ignore the rest of the sync calls // if we are in async mode so post a work item if (GetRoot() != null && XamlParseMode == XamlParseMode.Asynchronous && false == RecordReader.EndOfDocument) { // !! first post post the priority as normal so // don't always get a single record. Post(DispatcherPriority.Normal); } } } else { // we want to handle this async bamlRecordHandled = false; } return bamlRecordHandled; } // common call for Building From Xaml after the XamlParser class // has been created. void Initialize(ParserContext parserContext,XamlParser parser) { Debug.Assert(null != parserContext,"ParserContext cannot be null"); Debug.Assert(null != parser,"parser paramater is null"); _xamlParser = parser; // setup StreamManager, don't set our property since the StreamManager // property is only intended for Async BAML. ReadWriteStreamManager streamManager = new ReadWriteStreamManager(); // since RecordReader alters the context make a copy to pass into the Reader. ParserContext readerParserContext = new ParserContext(parserContext); _bamlWriter = new XamlTreeBuilderBamlRecordWriter(this,streamManager.WriterStream, parserContext, false /*isSerializer*/ ); RecordReader = new BamlRecordReader(streamManager.ReaderStream,readerParserContext,false /* loadMapTable */); // give Writer to the Parser. _xamlParser.BamlRecordWriter = _bamlWriter; _xamlParser.StreamManager = streamManager; } #endregion Methods #region Properties ////// Indicates if Multiple top-level roots are allowed /// internal bool MultipleRoots { get { return false; } } ////// XamlParser that has the main parse loop and writer overrides /// internal XamlParser Parser { get { return _xamlParser; } set { _xamlParser = value; } } ////// Writer of baml records, either to a stream or to buffer. /// internal BamlRecordWriter RecordWriter { get { return _bamlWriter; } set { _bamlWriter = value; } } #endregion Properties #region Data // XamlParser that is being used for Parsing the XAML XamlParser _xamlParser; // BamlWriter to use if writing out BAML BamlRecordWriter _bamlWriter; #endregion Data } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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