System.Collections.Generic.Stack.Clear()

public void Clear()
        {
            UndoStack.Clear();
            RedoStack.Clear();
            CanUndo = false;
            CanRedo = false;

            CommandsClear?.Invoke(this, EventArgs.Empty);
        }

private bool GetNextStep(int[] source, out int[] next)
        {
            // Step 1: Search all available destinations.
            int[][] neighbors = GameCore.AxeManCore.GetComponent<Distance>()
                .GetNeighbor(source);
            int minDistance = GetDistanceMapValue(source);
            int currentDistance;
            Stack<int[]> steps = new Stack<int[]>();

            foreach (int[] neighbor in neighbors)
            {
                currentDistance = GetDistanceMapValue(neighbor);
                if (currentDistance < minDistance)
                {
                    minDistance = currentDistance;
                    steps.Clear();
                    steps.Push(neighbor);
                }
                else if (currentDistance == minDistance)
                {
                    steps.Push(neighbor);
                }
            }

            // Step 2: Pick one destination.
            next = null;
            int count = steps.Count;
            int pick;

            if (count > 1)
            {
                // TODO: Get a random int from 0 to count.
                pick = 0;
                for (int i = 0; i < count; i++)
                {
                    next = steps.Pop();
                    if (i == pick)
                    {
                        break;
                    }
                }
            }
            else if (count == 1)
            {
                next = steps.Pop();
            }
            return count > 0;
        }

protected override IEnumerable<Token> GetTokensUnprocessed(string text)
        {
            var rules = GetStateRules();
            int pos = 0;
            var stateStack = new Stack<string>(50);
            stateStack.Push("root");
            var currentStateRules = rules[stateStack.Peek()];

            while (true)
            {
                bool found = false;
                foreach (var rule in currentStateRules)
                {
                    var m = rule.Regex.Match(text, pos);
                    if (m.Success)
                    {
                        var context = new RegexLexerContext(pos, m, stateStack, rule.TokenType);
                        Debug.replacedert(m.Index == pos, $"Regex \"{rule.Regex}\" should have matched at position {pos} but matched at {m.Index}");

                        var tokens = rule.Action.Execute(context);

                        foreach (var token in tokens)
                            yield return token;

                        pos = context.Position;
                        currentStateRules = rules[stateStack.Peek()];
                        found = true;
                        break;
                    }
                }

                if (!found)
                {
                    if (pos >= text.Length)
                        break;

                    if (text[pos] == '\n')
                    {
                        stateStack.Clear();
                        stateStack.Push("root");
                        currentStateRules = rules["root"];
                        yield return new Token(pos, TokenTypes.Text, "\n");
                        pos++;
                        continue;
                    }

                    yield return new Token(pos, TokenTypes.Error, text[pos].ToString());
                    pos++;
                }
            }


        }

public void Clear()
        {
            _emptyIds.Clear();
            _list.Clear();
            _first = -1;
            _last = -1;
        }

internal IDisposable CreateSession(float width, float height, DeviceContext drawingSession)
        {
            _canvasDrawingSessions.Clear();
            //_renderTarget = drawingSession;
            _canvasDrawingSessions.Push(new RenderTargetHolder { RenderTarget = drawingSession });

            UpdateClip(width, height);

            return PushMask(_currentClip, 1f);
            //return new Disposable(() => { });
        }

private void Cleanup() {
            Reset();
            foreach (var kc in _activeComponents.Reverse()) {
                if (kc.Value.LastPing != InputHelper.CurrentFrame - 1) {
                    Remove(kc.Key, kc.Value);
                }
            }
            _currentParent = this;
            _maxChildren = 0;
            _childrenCount = 0;
            _parents.Clear();
            _idsUsedThisFrame.Clear();
        }

public void Reset() {
            _stack.Clear();
        }

public bool UpdatePortsForField(string fieldName, bool sendPortUpdatedEvent = true)
		{
			bool changed  = false;

			fieldsToUpdate.Clear();
			updatedFields.Clear();

			fieldsToUpdate.Push(new PortUpdate{fieldNames = new List<string>(){fieldName}, node = this});

			// Iterate through all the ports that needs to be updated, following graph connection when the 
			// port is updated. This is required ton have type propagation multiple nodes that changes port types
			// are connected to each other (i.e. the relay node)
			while (fieldsToUpdate.Count != 0)
			{
				var (fields, node) = fieldsToUpdate.Pop();

				// Avoid updating twice a port
				if (updatedFields.Any((t) => t.node == node && fields.SequenceEqual(t.fieldNames)))
					continue;
				updatedFields.Add(new PortUpdate{fieldNames = fields, node = node});

				foreach (var field in fields)
				{
					if (node.UpdatePortsForFieldLocal(field, sendPortUpdatedEvent))
					{
						foreach (var port in node.IsFieldInput(field) ? (NodePortContainer)node.inputPorts : node.outputPorts)
						{
							if (port.fieldName != field)
								continue;

							foreach(var edge in port.GetEdges())
							{
								var edgeNode = (node.IsFieldInput(field)) ? edge.outputNode : edge.inputNode;
								var fieldsWithBehavior = edgeNode.nodeFields.Values.Where(f => HasCustomBehavior(f)).Select(f => f.fieldName).ToList();
								fieldsToUpdate.Push(new PortUpdate{fieldNames = fieldsWithBehavior, node = edgeNode});
							}
						}
						changed = true;
					}
				}
			}

			return changed;
		}

public static void ClearFoldoutStack()
		{
			UIFeature_DropDownStart.ClearDropDownsList();
			FoldoutStack.Clear();
		}

public void RegisterActions(string description = null)
        {
            TemporaryUndoableAction.Description = description ?? DefaultDescription;
            UndoStack.Push(TemporaryUndoableAction);
            TemporaryUndoableAction = new UndoableAction();
            RedoStack.Clear();
        }

public void RecordNavigation(IRegionNavigationJournalEntry entry, bool persistInHistory)
        {
            if (!this.isNavigatingInternal)
            {
                if (this.CurrentEntry != null && persistInHistory)
                {
                    this.backStack.Push(this.CurrentEntry);
                }

                this.forwardStack.Clear();
                this.CurrentEntry = entry;
            }
        }

public void flush()
        {
            undo_commands.Clear();
            redo_commands.Clear();
        }

public void Clear()
        {
            UndoStack.Clear();
            RedoStack.Clear();
            IsDirty = false;
        }

public virtual void Reset()
        {
            // wack Lexer state variables
            if (_input != null)
            {
                _input.Seek(0);
            }
            // rewind the input
            _token = null;
            _type = TokenConstants.InvalidType;
            _channel = TokenConstants.DefaultChannel;
            _tokenStartCharIndex = -1;
            _tokenStartColumn = -1;
            _tokenStartLine = -1;
            _text = null;
            _hitEOF = false;
            _mode = Antlr4.Runtime.Lexer.DEFAULT_MODE;
            _modeStack.Clear();
            Interpreter.Reset();
        }

public void RayCast(Func<RayCastInput, int, float> callback, ref RayCastInput input)
        {
            Vector2 p1 = input.Point1;
            Vector2 p2 = input.Point2;
            Vector2 r = p2 - p1;
            Debug.replacedert(r.LengthSquared() > 0.0f);
            r.Normalize();

            // v is perpendicular to the segment.
            Vector2 absV = MathUtils.Abs(new Vector2(-r.Y, r.X)); //FPE: Inlined the 'v' variable

            // Separating axis for segment (Gino, p80).
            // |dot(v, p1 - c)| > dot(|v|, h)

            float maxFraction = input.MaxFraction;

            // Build a bounding box for the segment.
            AABB segmentAABB = new AABB();
            {
                Vector2 t = p1 + maxFraction * (p2 - p1);
                Vector2.Min(ref p1, ref t, out segmentAABB.LowerBound);
                Vector2.Max(ref p1, ref t, out segmentAABB.UpperBound);
            }

            _raycastStack.Clear();
            _raycastStack.Push(_root);

            while (_raycastStack.Count > 0)
            {
                int nodeId = _raycastStack.Pop();
                if (nodeId == NullNode)
                {
                    continue;
                }

                TreeNode<T> node = _nodes[nodeId];

                if (AABB.TestOverlap(ref node.AABB, ref segmentAABB) == false)
                {
                    continue;
                }

                // Separating axis for segment (Gino, p80).
                // |dot(v, p1 - c)| > dot(|v|, h)
                Vector2 c = node.AABB.Center;
                Vector2 h = node.AABB.Extents;
                float separation = Math.Abs(Vector2.Dot(new Vector2(-r.Y, r.X), p1 - c)) - Vector2.Dot(absV, h);
                if (separation > 0.0f)
                {
                    continue;
                }

                if (node.IsLeaf())
                {
                    RayCastInput subInput;
                    subInput.Point1 = input.Point1;
                    subInput.Point2 = input.Point2;
                    subInput.MaxFraction = maxFraction;

                    float value = callback(subInput, nodeId);

                    if (value == 0.0f)
                    {
                        // the client has terminated the raycast.
                        return;
                    }

                    if (value > 0.0f)
                    {
                        // Update segment bounding box.
                        maxFraction = value;
                        Vector2 t = p1 + maxFraction * (p2 - p1);
                        segmentAABB.LowerBound = Vector2.Min(p1, t);
                        segmentAABB.UpperBound = Vector2.Max(p1, t);
                    }
                }
                else
                {
                    _raycastStack.Push(node.Child1);
                    _raycastStack.Push(node.Child2);
                }
            }
        }

void LoadLevel() {
			_currentLevel ++;
			if (_currentLevel > 3) {
				_currentLevel = 1;
			}
			_currentEventState = EVENT_STATE.STATE_PRE_EVENT;

			_preEventCards.Clear ();
			_postEventCards.Clear ();
			_eventCards.Clear ();
			_levelCards.Clear ();

			foreach (var card in _allCards.Values) {
				if (card.level == _currentLevel) {
					if (card.IsInitial ()) {
						if (card.IsPreEvent ()) {
							_preEventCards.Push (card);
						} else if (card.IsEventCard ()) {
							_eventCards.Push (card);
						} else if (card.IsPostEventCard()) {
							_postEventCards.Push(card);
						}
					} else {
						_levelCards.Add (card.id, card);
					}

				  	if (card.IsStartEvent ()) {
						_startLevelCard = card;
					}
				}
			}
				
			_preEventCards = shuffle (_preEventCards);
			_eventCards = shuffle (_eventCards);
		}

public void Do(IAction action)
        {
            action.DoAction();
            UndoStack.Push(action);
            RedoStack.Clear();
        }

public void Clear()
        {
            toPropagate.Clear();

            compatible = new int[indexCount, patternCount, directionsCount];

            var edgeLabels = new int[directionsCount];

            for (int index = 0; index < indexCount; index++)
            {
                if (!topology.ContainsIndex(index))
                    continue;

                // Cache edgeLabels
                for (int d = 0; d < directionsCount; d++)
                {
                    edgeLabels[d] = topology.TryMove(index, (Direction)d, out var dest, out var _, out var el) ? (int)el : -1;
                }

                for (int pattern = 0; pattern < patternCount; pattern++)
                {
                    for (int d = 0; d < directionsCount; d++)
                    {
                        var el = edgeLabels[d];
                        if (el >= 0)
                        {
                            var compatiblePatterns = propagatorArray[pattern][el].Length;
                            compatible[index, pattern, d] = compatiblePatterns;
                            if (compatiblePatterns == 0 && propagator.Wave.Get(index, pattern))
                            {
                                if (propagator.InternalBan(index, pattern))
                                {
                                    propagator.SetContradiction();
                                }
                                break;
                            }
                        }
                    }
                }
            }
        }

private ILASTTree BuildAST(CILInstrList instrs, ILASTVariable[] beginStack)
        {
            var tree = new ILASTTree();
            var evalStack = new Stack<ILASTVariable>(beginStack);
            Func<int, IILASTNode[]> popArgs = numArgs =>
            {
                var args = new IILASTNode[numArgs];
                for(var i = numArgs - 1; i >= 0; i--)
                    args[i] = evalStack.Pop();
                return args;
            };

            var prefixes = new List<Instruction>();
            foreach(var instr in instrs)
            {
                if(instr.OpCode.OpCodeType == OpCodeType.Prefix)
                {
                    prefixes.Add(instr);
                    continue;
                }

                int pushes, pops;
                ILASTExpression expr;
                if(instr.OpCode.Code == Code.Dup)
                {
                    pushes = pops = 1;

                    var arg = evalStack.Peek();
                    expr = new ILASTExpression
                    {
                        ILCode = Code.Dup,
                        Operand = null,
                        Arguments = new IILASTNode[] {arg}
                    };
                }
                else
                {
                    instr.CalculateStackUsage(method.ReturnType.ElementType != ElementType.Void, out pushes, out pops);
                    Debug.replacedert(pushes == 0 || pushes == 1);

                    if(pops == -1)
                    {
                        evalStack.Clear();
                        pops = 0;
                    }

                    expr = new ILASTExpression
                    {
                        ILCode = instr.OpCode.Code,
                        Operand = instr.Operand,
                        Arguments = popArgs(pops)
                    };
                    if(expr.Operand is Instruction || expr.Operand is Instruction[])
                        instrReferences.Add(expr);
                }
                expr.CILInstr = instr;
                if(prefixes.Count > 0)
                {
                    expr.Prefixes = prefixes.ToArray();
                    prefixes.Clear();
                }

                if(pushes == 1)
                {
                    var variable = new ILASTVariable
                    {
                        Name = string.Format("s_{0:x4}", instr.Offset),
                        VariableType = ILASTVariableType.StackVar
                    };
                    evalStack.Push(variable);

                    tree.Add(new ILASTreplacedignment
                    {
                        Variable = variable,
                        Value = expr
                    });
                }
                else
                {
                    tree.Add(expr);
                }
            }
            tree.StackRemains = evalStack.Reverse().ToArray();
            return tree;
        }

public override void OnGUI(MaterialEditor materialEditor, MaterialProperty[] properties)
	{
		mMaterialEditor = materialEditor;

#if SHOW_DEFAULT_INSPECTOR
		base.OnGUI();
		return;
#else

		//Header
		EditorGUILayout.BeginHorizontal();
		var label = (Screen.width > 450f) ? "TOONY COLORS PRO 2 - INSPECTOR (Generated Shader)" : (Screen.width > 300f ? "TOONY COLORS PRO 2 - INSPECTOR" : "TOONY COLORS PRO 2");
		TCP2_GUI.HeaderBig(label);
		if(TCP2_GUI.Button(TCP2_GUI.CogIcon, "O", "Open in Shader Generator"))
		{
			if(targetMaterial.shader != null)
			{
				TCP2_ShaderGenerator.OpenWithShader(targetMaterial.shader);
			}
		}
		EditorGUILayout.EndHorizontal();
		TCP2_GUI.Separator();

		//Iterate Shader properties
		materialEditor.serializedObject.Update();
		var mShader = materialEditor.serializedObject.FindProperty("m_Shader");
		toggledGroups.Clear();
		if(materialEditor.isVisible && !mShader.hasMultipleDifferentValues && mShader.objectReferenceValue != null)
		{
			//Retina display fix
			EditorGUIUtility.labelWidth = TCP2_Utils.ScreenWidthRetina - 120f;
			EditorGUIUtility.fieldWidth = 64f;

			EditorGUI.BeginChangeCheck();

			EditorGUI.indentLevel++;
			foreach (var p in properties)
			{
				var visible = (toggledGroups.Count == 0 || toggledGroups.Peek());

				//Hacky way to separate material inspector properties into foldout groups
				if(p.name.StartsWith("__BeginGroup"))
				{
					//Foldout
					if(visible)
					{
						GUILayout.Space(8f);
						p.floatValue = EditorGUILayout.Foldout(p.floatValue > 0, p.displayName, TCP2_GUI.FoldoutBold) ? 1 : 0;
					}

					EditorGUI.indentLevel++;
					toggledGroups.Push((p.floatValue > 0) && visible);
				}
				else if(p.name.StartsWith("__EndGroup"))
				{
					EditorGUI.indentLevel--;
					toggledGroups.Pop();
					GUILayout.Space(8f);
				}
				else
				{
					//Draw regular property
					if(visible && (p.flags & (MaterialProperty.PropFlags.PerRendererData | MaterialProperty.PropFlags.HideInInspector)) == MaterialProperty.PropFlags.None)
						mMaterialEditor.ShaderProperty(p, p.displayName);
				}
			}
			EditorGUI.indentLevel--;

			if (EditorGUI.EndChangeCheck())
			{
				materialEditor.PropertiesChanged();
			}
		}

#endif     // !SHOW_DEFAULT_INSPECTOR

#if UNITY_5_5_OR_NEWER
		TCP2_GUI.Separator();
		materialEditor.RenderQueueField();
#endif
#if UNITY_5_6_OR_NEWER
		materialEditor.EnableInstancingField();
#endif
	}

private static void OnBreakEditor(Editor editor)
        {
            cachedEditors.Clear();
        }

public void Clear(Color color)
        {
            UpdateDrawingSessionWithFlags(0);

            CurrentRenderTarget.Clear(color);

            _matrixSaves.Clear();
            _flagSaves.Clear();
            _clipSaves.Clear();
        }

public override void Clear()
        {
            stack.Clear();
        }

public void Stop () {
            foreach (var dialogue in _activeDialogue) {
                dialogue.Stop();
            }

            _activeDialogue.Clear();
        }

public void reset()
        {
            lastField_.Clear();
            lastFieldId_ = 0;
        }

public static List<Rect> FindAllRects(bool[][] grid)
        {
            List<Rect> resultRects = new List<Rect>();

            // create a pre-process where each grid value actually indicates how many 1's are below it
            int[][] intGrid = new int[grid.Length][];
            for (int xx = 0; xx < grid.Length; xx++)
            {
                intGrid[xx] = new int[grid[0].Length];

                // first line (bottom)
                if (grid[xx][grid[0].Length - 1])
                    intGrid[xx][grid[0].Length - 1] = 1;

                // all lines above the first line
                for (int yy = grid[0].Length - 2; yy >= 0; yy--)
                {
                    if (grid[xx][yy])
                        intGrid[xx][yy] = intGrid[xx][yy + 1] + 1;
                }
            }

            // go through each row with the histogram approach; capacity is known so might as well specify it here
            Stack<int> prevShadow = new Stack<int>(intGrid.Length);
            for (int yy = 0; yy < intGrid[0].Length; yy++)
            {
                prevShadow.Clear();
                prevShadow.Push(-1);
                int prevZero = -1;
                for (int xx = 0; xx < intGrid.Length; xx++)
                {
                    // encountered a smaller number? compute rectangles with all stack values greater than the current number
                    int prevHistogram = prevShadow.Peek() > -1 ? intGrid[prevShadow.Peek()][yy] : 0;
                    while (intGrid[xx][yy] <= prevHistogram)
                    {
                        prevShadow.Pop();
                        if (prevHistogram == intGrid[xx][yy])
                            break;

                        // this new rectangle is not a subset of a larger rectangle if...
                        // for the row above this rectangle, the position of 1's going back to the start of the rectangle
                        // is GREATER than the end border (exclusive) of this rectangle.
                        // if it's equal or less, this rectangle is a subset and should not be counted
                        // so just keep track of the last zero
                        if (prevZero > prevShadow.Peek())
                            resultRects.Add(new Rect(prevShadow.Peek() + 1, yy, xx - (prevShadow.Peek() + 1), prevHistogram));

                        prevHistogram = prevShadow.Peek() > -1 ? intGrid[prevShadow.Peek()][yy] : 0;
                    }

                    prevShadow.Push(xx);
                    if (yy <= 0 || intGrid[xx][yy - 1] == 0)
                        prevZero = xx;
                }

                // close out with one last 0.
                int lastHistogram = prevShadow.Peek() > -1 ? intGrid[prevShadow.Peek()][yy] : 0;
                while (lastHistogram > 0)
                {
                    prevShadow.Pop();

                    // check on prevZero here too
                    if (prevZero > prevShadow.Peek())
                        resultRects.Add(new Rect(prevShadow.Peek() + 1, yy, intGrid.Length - (prevShadow.Peek() + 1), lastHistogram));

                    lastHistogram = prevShadow.Peek() > -1 ? intGrid[prevShadow.Peek()][yy] : 0;
                }
            }

            return resultRects;
        }

public void Become(Receive receive)
        {
            _behaviors.Clear();
            _behaviors.Push(receive);
        }

public void ClearFallbackInputStack()
        {
            fallbackInputStack.Clear();
        }

public void Clear()
        {
            this.CurrentEntry = null;
            this.backStack.Clear();
            this.forwardStack.Clear();
        }

public void Query(Func<int, bool> callback, ref AABB aabb)
        {
            _queryStack.Clear();
            _queryStack.Push(_root);

            while (_queryStack.Count > 0)
            {
                int nodeId = _queryStack.Pop();
                if (nodeId == NullNode)
                {
                    continue;
                }

                TreeNode<T> node = _nodes[nodeId];

                if (AABB.TestOverlap(ref node.AABB, ref aabb))
                {
                    if (node.IsLeaf())
                    {
                        bool proceed = callback(nodeId);
                        if (proceed == false)
                        {
                            return;
                        }
                    }
                    else
                    {
                        _queryStack.Push(node.Child1);
                        _queryStack.Push(node.Child2);
                    }
                }
            }
        }

void IDisposable.Dispose()
#pragma warning restore CA1063 // Implement IDisposable Correctly
    {
      Limit = 0;
      m_SchemaName = null;
      m_Statement.Clear();// StringBuilder uses internal pool to relive allocation pressure
      m_Select.Clear();
      m_From.Clear();
      m_Where.Clear();
      m_OrderBy.Clear();
      m_WhereLevels.Clear();
      m_CurrentWhereNodes = 0;
      m_GroupBy.Clear();
      m_Having.Clear();
      m_Parameters.Clear();//List: but does not trim excess so internal buffer gets cached

      Thread.MemoryBarrier();

      //push to cache
      if (null == Interlocked.CompareExchange(ref s_Cache1, this, null)) return;
      if (null == Interlocked.CompareExchange(ref s_Cache2, this, null)) return;
      if (null == Interlocked.CompareExchange(ref s_Cache3, this, null)) return;
      if (null == Interlocked.CompareExchange(ref s_Cache4, this, null)) return;
      Interlocked.CompareExchange(ref s_Cache5, this, null);
    }

public void RegisterOperation(IOperation operation)
        {
            if (CurrentCompositeOperation != null)
            {
                CurrentCompositeOperation.Operations.Add(operation);
            }
            else
            {
                UndoStack.Push(operation);
                RedoStack.Clear();
            }
        }

public void Do(IRecordCommand command)
        {
            if (!_process)
            {
                Debug.WriteLine("if (!process) {...");
                return;
            }

            try
            {
                _process = false;
                command.Do();

                UndoStack.Push(command);
                CanUndo = UndoStack.Count > 0;

                RedoStack.Clear();
                CanRedo = RedoStack.Count > 0;
            }
            catch
            {
                Debug.Fail("Commandの実行中に例外が発生。");
                CommandCancel?.Invoke(null, EventArgs.Empty);
            }

            _process = true;
            Executed?.Invoke(command, CommandType.Do);
        }

private static Stack<IExpressionNode> GetMatchSegments(IExpressionNode node)
        {
            var result = new Stack<IExpressionNode>();

            // Node is a named-value
            if (node is NamedValue)
            {
                result.Push(node);
            }
            // Node is an index
            else if (node is Sdk.Operators.Index index)
            {
                while (true)
                {
                    // Push parameter 1. Treat anything other than literal as a wildcard.
                    var parameter1 = index.Parameters[1];
                    result.Push(parameter1 is Literal ? parameter1 : new Wildcard());

                    var parameter0 = index.Parameters[0];

                    // Parameter 0 is a named-value
                    if (parameter0 is NamedValue)
                    {
                        result.Push(parameter0);
                        break;
                    }
                    // Parameter 0 is an index
                    else if (parameter0 is Sdk.Operators.Index index2)
                    {
                        index = index2;
                    }
                    // Otherwise clear
                    else
                    {
                        result.Clear();
                        break;
                    }
                }
            }

            return result;
        }

public void Dispose()
        {
            _freeVoices.Clear();
            _activeVoices.Clear();
        }

private void ParseString(Template ownerTemplate, Tag container, string text)
        {
            //设置根文档模板
            this.DoreplacedentElement = ownerTemplate;
            //this.Text = text;

            if (string.IsNullOrEmpty(text)) return;

            int charOffset = 0, offset = 0;
            bool isClosedTag;
            Match match = null;

            //标签堆栈
            Stack<Tag> tagStack = new Stack<Tag>();
            tagStack.Push(container);

            try
            {
                while (offset < text.Length)
                {
                    if (ParserHelper.IsVariableTagStart(text, offset) && (match = ParserRegex.VarTagRegex.Match(text, offset)).Success)  //匹配到模板变量
                    {
                        //构建文本节点
                        ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, match.Index - charOffset);
                        //构建模板变量
                        ParserHelper.CreateVariableTag(ownerTemplate, container, match);
                    }
                    else if (ParserHelper.IsTagStart(text, offset) && (match = ParserRegex.TagRegex.Match(text, offset)).Success)  //匹配到某种类型的标签
                    {
                        //构建文本节点
                        ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, match.Index - charOffset);
                        //构建标签
                        Tag tag = ParserHelper.CreateTag(ownerTemplate, match, out isClosedTag);

                        //将标签加入堆栈
                        tagStack.Push(tag);
                        //将解析权交给标签
                        bool flag = tag.ProcessBeginTag(ownerTemplate, container, tagStack, text, ref match, isClosedTag);
                        //非已闭合标签或者是单标签则处理标签的结束标签
                        if (flag)
                        {
                            tag.ProcessEndTag(ownerTemplate, tag, tagStack, text, ref match);
                        }
                        if (tagStack.Count > 0 && tagStack.Peek() == tag && isClosedTag)
                        {
                            //闭合标签则回滚一级
                            tagStack.Pop();
                        }
                        //取得容器
                        if (tagStack.Count > 0) container = tagStack.Peek();
                    }
                    else if (ParserHelper.IsCloseTagStart(text, offset) && (match = ParserRegex.EndTagRegex.Match(text, offset)).Success)            //匹配到某个结束标签
                    {
                        //取得标签名称
                        string name = match.Groups["tagname"].Value;
                        //非匹配的结束标签.则模板有错
                        throw new ParserException("无效的结束标签");
                    }
                    else if (ParserHelper.IsVTExpressionStart(text, offset))
                    {
                        char s = ParserHelper.ReadChar(text, offset + ParserHelper.VTExpressionHead.Length);
                        int startOffset = offset + ParserHelper.VTExpressionHead.Length + 1;
                        int lastOffset = text.IndexOf(s, offset + ParserHelper.VTExpressionHead.Length + 1);
                        if (lastOffset == -1) throw new ParserException(string.Format("无法找到VT表达式\"{0}\"的结束标记", ParserHelper.VTExpressionHead));
                        string code = text.Substring(startOffset, lastOffset - startOffset);
                        if (code.Length > 0)
                        {
                            //构建文本节点
                            ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, offset - charOffset);
                            //解析表达式里的代码
                            new TemplateDoreplacedent(ownerTemplate, container, code, ownerTemplate.OwnerDoreplacedent.DoreplacedentConfig);
                        }
                        offset = lastOffset + 1;
                        charOffset = offset;
                        continue;
                    }
                    else if (ParserHelper.IsCommentTagStart(text, offset))
                    {
                        //构建文本节点
                        ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, offset - charOffset);

                        //找到注释的起始标记"<!--vt[",则直接查找结束标记"]-->"
                        offset = text.IndexOf(ParserHelper.CommentTagEnd, offset + ParserHelper.CommentTagStart.Length);
                        if (offset == -1) throw new ParserException("无法找到注释的结束标记");
                        offset += ParserHelper.CommentTagEnd.Length;
                        charOffset = offset;
                        continue;
                    }
                    //处理偏移位置
                    if (match != null && match.Success)
                    {
                        charOffset = offset = match.Index + match.Length;
                        match = null;
                    }
                    else
                    {
                        offset++;
                    }
                }
                //处理文本字符
                ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, text.Length - charOffset);
                if (tagStack.Count > 1)
                {
                    //堆栈里还有其它元素.则有错误
                    throw new ParserException(string.Format("{0}标签未闭合", tagStack.Pop()));
                }
            }
            catch (ParserException ex)
            {
                //如果错误中不包含行号与列号.则计算行号与列号
                if (!ex.HaveLineAndColumnNumber && match != null && match.Success)
                {
                    //获取当前出错时正在解析的模板文件
                    string file = string.Empty;
                    Tag tag = container;
                    while (string.IsNullOrEmpty(file) && tag != null)
                    {
                        if (tag is Template)
                        {
                            file = ((Template)tag).File;
                        }
                        else if (tag is IncludeTag)
                        {
                            file = ((IncludeTag)tag).File;
                        }
                        tag = tag.Parent;
                    }
                    if (string.IsNullOrEmpty(file))
                    {
                        throw new ParserException(Utility.GetLineAndColumnNumber(text, match.Index), match.ToString(), ex.Message);
                    }
                    else
                    {
                        throw new ParserException(file, Utility.GetLineAndColumnNumber(text, match.Index), match.ToString(), ex.Message);
                    }
                }
                else
                {
                    //继续抛出错误
                    throw;
                }
            }
            finally
            {
                //清空堆栈
                tagStack.Clear();
                tagStack = null;
            }
        }

private Stack<T> shuffle<T>(Stack<T> stack)
		{
			List<T> list = stack.ToList();
			stack.Clear ();
			while(list.Count > 0)
			{
				int randomIndex = Random.Range(0, list.Count);
				stack.Push(list[randomIndex]);
				list.RemoveAt(randomIndex);
			}

			return stack;
		}

public void Clear()
        {
            stack.Clear();
        }

public void Clear()
        {
            _freeChunks.Clear();
            _sizesList.Clear();
            _chunksCount = 0;
        }

public void ClearStack()
        {
            UndoStack.Clear();
            RedoStack.Clear();
        }

public void Clear()
        {
            toPropagate.Clear();
            this.wave = propagator.Wave;
        }

public void Reset ()
        {
            has_reached_end = false;

            ctx_stack.Clear ();
            context = new WriterContext ();
            ctx_stack.Push (context);

            if (inst_string_builder != null)
                inst_string_builder.Remove (0, inst_string_builder.Length);
        }

private void performNewCommand(PaintCommand command) {
		if (!undoStack.Contains (command)) {
			redoStack.Clear ();
			undoStack.Push (command);
		}
		//Debug.Log ("new command pushed " + "undo "+ undoStack.Count + "redo " + redoStack.Count);
	}

void SceneGUICallback(SceneView scene_view)
        {
            if (Event.current.type != EventType.Repaint)
                return;

            if (!freeze_view && (Time.unscaledTime != most_recent_load || display_roots == null ||
                                 display_roots.Length != display_count))
            {
                if (buffer == null || buffer.count == 0)
                    return;

                most_recent_count = GetBufferLength();
                if (most_recent_count > debug_array.Length)
                    most_recent_count = debug_array.Length;
                buffer.GetData(debug_array, 0, 0, most_recent_count);

                Matrix4x4 times_half_plus_half = Matrix4x4.idenreplacedy;
                times_half_plus_half.SetTRS(new Vector3(0.5f, 0.5f, 0), Quaternion.idenreplacedy, new Vector3(0.5f, 0.5f, 1));
                mat_screen2cam = Matrix4x4.Inverse(Matrix4x4.Scale(buf_scale) * times_half_plus_half * buf_projmat);
                mat_cam2world = Matrix4x4.Inverse(buf_world2camera);

                display_roots = new uint[display_count];
                if (most_recent_count > 1)
                {
                    /* first try to see if there are <= display_count entries in total */
                    int total = 0;
                    for (uint j = 1; j < most_recent_count; j++)
                        if (debug_array[j].kind == _DEBUG_ROOT)
                        {
                            total++;
                            if (total > display_count)
                                break;
                        }

                    if (total > display_count)
                    {
                        /* too many entries: sample randomly */
                        for (int i = 0; i < display_count; i++)
                        {
                            uint j = (uint)Random.Range(1, most_recent_count);
                            while (debug_array[j].next < j)
                                j = debug_array[j].next;
                            Debug.replacedert(debug_array[j].kind == _DEBUG_ROOT);
                            display_roots[i] = j;
                        }
                    }
                    else
                    {
                        /* not too many entries: pick them all */
                        total = 0;
                        for (uint j = 1; j < most_recent_count; j++)
                            if (debug_array[j].kind == _DEBUG_ROOT)
                                display_roots[total++] = j;
                    }
                }
                most_recent_load = Time.unscaledTime;
            }

            Handles.matrix = Matrix4x4.idenreplacedy;
            stack.Clear();
            textlines.Clear();

            if (display_roots != null && debug_array != null)
                for (int i = 0; i < display_roots.Length; i++)
                    DisplayHandle(display_roots[i]);
        }

void ProcessNodeList(CommandBuffer cmd, HashSet<BaseNode> nodes)
		{
			HashSet<ILoopStart> starts = new HashSet<ILoopStart>();
			HashSet<ILoopEnd> ends = new HashSet<ILoopEnd>();
			HashSet<INeedLoopReset> iNeedLoopReset = new HashSet<INeedLoopReset>();

			// Note that this jump pattern doesn't handle correctly the multiple dependencies a for loop
			// can have and it may cause some nodes to be processed multiple times unnecessarily, depending on the compute order.
			Stack<(ILoopStart node, int index)> jumps = new Stack<(ILoopStart, int)>();

			// TODO: cache?
			var sortedNodes = nodes.Where(n => n.computeOrder >= 0).OrderBy(n => n.computeOrder).ToList();

			int maxLoopCount = 0;
			jumps.Clear();
			starts.Clear();
			ends.Clear();
			iNeedLoopReset.Clear();

			for (int executionIndex = 0; executionIndex < sortedNodes.Count; executionIndex++)
			{
				maxLoopCount++;
				if (maxLoopCount > 10000)
					return;

				var node = sortedNodes[executionIndex];

				if (node is ILoopStart loopStart)
				{
					if (!starts.Contains(loopStart))
					{
						loopStart.PrepareLoopStart();
						jumps.Push((loopStart, executionIndex));
						starts.Add(loopStart);
					}
				}

				bool finalIteration = false;
				if (node is ILoopEnd loopEnd)
				{
					if (jumps.Count == 0)
					{
						Debug.Log("Aborted execution, for end without start");
						return ;
					}

					var startLoop = jumps.Peek();
					if (!ends.Contains(loopEnd))
					{
						loopEnd.PrepareLoopEnd(startLoop.node);
						ends.Add(loopEnd);
					}

					// Jump back to the foreach start
					if (!startLoop.node.IsLasreplacederation())
					{
						executionIndex = startLoop.index - 1;
					}
					else
					{
						var fs2 = jumps.Pop();
						starts.Remove(fs2.node);
						ends.Remove(loopEnd);
						finalIteration = true;
					}
				}

				if (node is INeedLoopReset i)
				{
					if (!iNeedLoopReset.Contains(i))
					{
						i.PrepareNewIteration();
						iNeedLoopReset.Add(i);
					}

					// TODO: remove this node form iNeedLoopReset when we go over a foreach start again
				}
			
				if (finalIteration && node is ILoopEnd le)
				{
					le.FinalIteration();
				}

				ProcessNode(cmd, node);
			}
		}

private static string codeTreeEnd(Stack<string> codeTree, string tag) {
			string ret = string.Empty;
			Stack<int> pop = new Stack<int>();
			foreach (string ct in codeTree) {
				if (ct == "import" ||
					ct == "include") {
					pop.Push(1);
				} else if (ct == tag) {
					pop.Push(2);
					break;
				} else {
					if (string.IsNullOrEmpty(tag) == false) pop.Clear();
					break;
				}
			}
			if (pop.Count == 0 && string.IsNullOrEmpty(tag) == false)
				return string.Concat("语法错误，{", tag, "} {/", tag, "} 并没配对");
			while (pop.Count > 0 && pop.Pop() > 0) codeTree.Pop();
			return ret;
		}

public bool Read ()
        {
            if (end_of_input)
                return false;

            if (end_of_json) {
                end_of_json = false;
                automaton_stack.Clear ();
                automaton_stack.Push ((int) ParserToken.End);
                automaton_stack.Push ((int) ParserToken.Text);
            }

            parser_in_string = false;
            parser_return    = false;

            token       = JsonToken.None;
            token_value = null;

            if (! read_started) {
                read_started = true;

                if (! ReadToken ())
                    return false;
            }


            int[] entry_symbols;

            while (true) {
                if (parser_return) {
                    if (automaton_stack.Peek () == (int) ParserToken.End)
                        end_of_json = true;

                    return true;
                }

                current_symbol = automaton_stack.Pop ();

                ProcessSymbol ();

                if (current_symbol == current_input) {
                    if (! ReadToken ()) {
                        if (automaton_stack.Peek () != (int) ParserToken.End)
                            throw new JsonException (
                                "Input doesn't evaluate to proper JSON text");

                        if (parser_return)
                            return true;

                        return false;
                    }

                    continue;
                }

                try {

                    entry_symbols =
                        parse_table[current_symbol][current_input];

                } catch (KeyNotFoundException e) {
                    throw new JsonException ((ParserToken) current_input, e);
                }

                if (entry_symbols[0] == (int) ParserToken.Epsilon)
                    continue;

                for (int i = entry_symbols.Length - 1; i >= 0; i--)
                    automaton_stack.Push (entry_symbols[i]);
            }
        }

public void Clear()
        {
            for (int i = 0; i <= SpanHelper.MaximumSpanSizePower; ++i)
            {
                pools[i].Clear();
            }
        }

public void ClearModalInputStack()
        {
            modalInputStack.Clear();
        }

public void ClearIndent ()
        {
            currentIndent = string.Empty;
            Indents.Clear ();
        }

See More Examples