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5ec4b83d35
Cases: - literal - "3.14" - variable access - "MyVar" - new local variavle - "a" UE-17139 Math Expressions fail to compile when output pin connected [CL 2591759 by Maciej Mroz in Main branch]
89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "K2Node_Composite.h"
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#include "EdGraph/EdGraphNodeUtils.h" // for FNodeTextCache
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#include "K2Node_MathExpression.generated.h"
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/**
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* This node type acts like a collapsed node, a single node that represents
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* a larger sub-network of nodes (contained within a sub-graph). This node will
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* take the math expression it was named with, and attempt to convert it into a
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* series of math nodes. If it is unsuccessful, then it generates a series of
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* actionable errors.
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*/
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UCLASS()
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class BLUEPRINTGRAPH_API UK2Node_MathExpression : public UK2Node_Composite
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{
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GENERATED_UCLASS_BODY()
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public:
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// The math expression to evaluate
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UPROPERTY(EditAnywhere, Category = Expression)
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FString Expression;
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public:
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// UObject interface
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virtual void PostEditChangeProperty(struct FPropertyChangedEvent& PropertyChangedEvent) override;
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// End of UObject interface
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// UEdGraphNode interface
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virtual TSharedPtr<class INameValidatorInterface> MakeNameValidator() const override;
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virtual void OnRenameNode(const FString& NewName) override;
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virtual FText GetNodeTitle(ENodeTitleType::Type TitleType) const override;
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virtual void PostPlacedNewNode() override;
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virtual void ReconstructNode() override;
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virtual void FindDiffs(class UEdGraphNode* OtherNode, struct FDiffResults& Results ) override;
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virtual bool ShouldMergeChildGraphs() const override { return ShouldExpandInsteadCompile(); }
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// End of UEdGraphNode interface
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// UK2Node interface
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virtual void ValidateNodeDuringCompilation(class FCompilerResultsLog& MessageLog) const override;
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virtual void GetMenuActions(FBlueprintActionDatabaseRegistrar& ActionRegistrar) const override;
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virtual class FNodeHandlingFunctor* CreateNodeHandler(class FKismetCompilerContext& CompilerContext) const override;
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virtual bool IsNodePure() const { return !ShouldExpandInsteadCompile(); }
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// End of UK2Node interface
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// Begin UK2Node_EditablePinBase interface
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virtual bool CanCreateUserDefinedPin(const FEdGraphPinType& InPinType, EEdGraphPinDirection InDesiredDirection, FText& OutErrorMessage) override { return false; }
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// End UK2Node_EditablePinBase interface
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private:
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/* Returns true, when the node can/should not be optimized.*/
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bool ShouldExpandInsteadCompile() const;
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/**
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* Clears this node's sub-graph, and then takes the supplied string and
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* parses, and converts it into a series of new graph nodes.
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*
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* @param NewExpression The new string we wish to replace the current "Expression".
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*/
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void RebuildExpression(FString NewExpression);
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/**
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* Clears the cached expression string, deletes all generated node, clears
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* input pins, and resets the parser and graph generator (priming this node
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* for a new expression).
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*/
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void ClearExpression();
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/** Sanitizes an expression for display, removing outermost parentheses */
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FString SanitizeDisplayExpression(FString InExpression) const;
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/** Helper function to build the node's full title */
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FText GetFullTitle(FText InExpression) const;
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private:
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/** Cached so we don't have to regenerate it when the graph is recompiled */
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TSharedPtr<class FCompilerResultsLog> CachedMessageLog;
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/** Constructing FText strings can be costly, so we cache the node's title */
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FNodeTextCache CachedNodeTitle;
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/** Constructing the display string for a Math Expression is costly, so we cache it */
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FNodeTextCache CachedDisplayExpression;
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};
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