1. Epic GamesDeveloper
  3. FExpressionGrammar

FExpressionGrammar

A lexical gammer defining how to parse an expression.

Unreal Engine C++ API Reference > Runtime > Core > Misc

References

   
Module Core
Header /Engine/Source/Runtime/Core/Public/Misc/ExpressionParserTypes.h
Include #include "Misc/ExpressionParserTypes.h"

Syntax

class FExpressionGrammar

Remarks

A lexical gammer defining how to parse an expression. Clients must define the tokens and operators to be interpreted by the parser.

Functions

  Type Name Description
Public function void

DefineBinaryOperator ( int32 InPrecedence,
EAssociativity InAssociativity,
bool bCanShortCircuit
)

 Define a binary operator for the specified symbol, with the specified precedence and associativity NOTE: Associativity defaults to RightToLeft for legacy reasons.
Public function void Define a grouping operator from two expression node types
Public function void Define a post-unary operator for the specified symbol
Public function void Define a pre-unary operator for the specified symbol
Public function Const const FOpParameters * Get the binary operator precedence and associativity parameters, for the specified symbol, if any
Public function Const const FGuid *

GetGrouping ( const FGuid& TypeId
)

 Retrieve the corresponding grouping token for the specified open group type, or nullptr if it's not a group token
Public function Const bool

HasPostUnaryOperator ( const FGuid& TypeId
)

 Check if this grammar defines a post-unary operator for the specified symbol
Public function Const bool

HasPreUnaryOperator ( const FGuid& TypeId
)

 Check if this grammar defines a pre-unary operator for the specified symbol

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