Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / XamlBuildTask / Microsoft / Build / Tasks / Xaml / XamlStackWriter.cs / 1305376 / XamlStackWriter.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace Microsoft.Build.Tasks.Xaml { using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Text; using System.Xaml; using System.Runtime; internal enum XamlStackFrameType { None, Object, GetObject, Member } internal struct XamlStackFrame { private static object s_setSentinel = new object(); private object _data; private object _isSet; public XamlStackFrameType FrameType { get; private set; } public XamlType Type { get { return FrameType == XamlStackFrameType.Object ? (XamlType)_data : null; } } public XamlMember Member { get { return FrameType == XamlStackFrameType.Member ? (XamlMember)_data : null; } } public bool IsSet() { return _isSet != null; } public bool IsSet(XamlMember member) { HashSetsetMembers = _isSet as HashSet ; return (setMembers == null) ? false : setMembers.Contains(member); } internal void Set() { if(FrameType != XamlStackFrameType.Member) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnexpectedXaml)); } _isSet = s_setSentinel; } internal void Set(XamlMember member) { if(FrameType != XamlStackFrameType.Object && FrameType != XamlStackFrameType.GetObject) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnexpectedXaml)); } HashSet setMembers = _isSet as HashSet ; if (setMembers == null) { setMembers = new HashSet (); _isSet = setMembers; } if (!setMembers.Contains(member)) { setMembers.Add(member); } } internal static XamlStackFrame ForObject(XamlType type) { XamlStackFrame result = new XamlStackFrame(); result._data = type; result.FrameType = XamlStackFrameType.Object; return result; } internal static XamlStackFrame ForGetObject() { XamlStackFrame result = new XamlStackFrame(); result.FrameType = XamlStackFrameType.GetObject; return result; } internal static XamlStackFrame ForMember(XamlMember member) { XamlStackFrame result = new XamlStackFrame(); result._data = member; result.FrameType = XamlStackFrameType.Member; return result; } } internal class XamlStackWriter : XamlWriter { List _stack = new List (); // the stack writer does not care about schema context public override XamlSchemaContext SchemaContext { get { return null; } } public int Depth { get { return _stack.Count; } } public XamlStackFrame TopFrame { get { Fx.Assert(_stack.Count != 0, "Stack cannot be empty"); return _stack[_stack.Count - 1]; } } public XamlStackFrame FrameAtDepth(int ndx) { return _stack[ndx - 1]; } public override void WriteEndMember() { if (TopFrame.FrameType != XamlStackFrameType.Member) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnexpectedXaml)); } PopStack(); } public override void WriteEndObject() { if (TopFrame.FrameType != XamlStackFrameType.Object && TopFrame.FrameType != XamlStackFrameType.GetObject) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnexpectedXaml)); } PopStack(); } public override void WriteGetObject() { SetTopFrame(); _stack.Add(XamlStackFrame.ForGetObject()); } public override void WriteNamespace(NamespaceDeclaration namespaceDeclaration) { throw FxTrace.Exception.AsError(new NotImplementedException()); } public override void WriteStartMember(XamlMember property) { if (property == null) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnexpectedXamlValueNull("property"))); } SetTopFrame(property); _stack.Add(XamlStackFrame.ForMember(property)); } public override void WriteStartObject(XamlType type) { if (type == null) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.UnexpectedXamlValueNull("type"))); } SetTopFrame(); _stack.Add(XamlStackFrame.ForObject(type)); } public override void WriteValue(object value) { SetTopFrame(); } private void PopStack() { _stack.RemoveAt(_stack.Count - 1); } private void SetTopFrame() { if (Depth > 0 && TopFrame.FrameType == XamlStackFrameType.Member) { TopFrame.Set(); } } private void SetTopFrame(XamlMember member) { if (Depth > 0 && (TopFrame.FrameType == XamlStackFrameType.GetObject || TopFrame.FrameType == XamlStackFrameType.Object)) { TopFrame.Set(member); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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