FExpressionGrammar Class Reference

#include <ExpressionParserTypes.h>

Public Member Functions
template<typename StartGroupType , typename EndGroupType >
void	DefineGrouping ()
template<typename ExpressionNodeType >
void	DefinePreUnaryOperator ()
template<typename ExpressionNodeType >
void	DefinePostUnaryOperator ()
template<typename ExpressionNodeType >
void	DefineBinaryOperator (int32 InPrecedence, EAssociativity InAssociativity=EAssociativity::RightToLeft, bool bCanShortCircuit=false)
CORE_API const FGuid *	GetGrouping (const FGuid &TypeId) const
CORE_API bool	HasPreUnaryOperator (const FGuid &TypeId) const
CORE_API bool	HasPostUnaryOperator (const FGuid &TypeId) const
CORE_API const FOpParameters *	GetBinaryOperatorDefParameters (const FGuid &TypeId) const

Detailed Description

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

Member Function Documentation

DefineBinaryOperator()

template<typename ExpressionNodeType >

void FExpressionGrammar::DefineBinaryOperator ( int32  InPrecedence, EAssociativity  InAssociativity = EAssociativity::RightToLeft, bool  bCanShortCircuit = false  )

inline

Define a binary operator for the specified symbol, with the specified precedence and associativity NOTE: Associativity defaults to RightToLeft for legacy reasons.

Parameters

InPrecedence	The precedence (priority of execution) this operator should have
InAssociativity	With operators of the same precedence, determines whether they execute left to right, or right to left

DefineGrouping()

template<typename StartGroupType , typename EndGroupType >

void FExpressionGrammar::DefineGrouping ( )

inline

Define a grouping operator from two expression node types

DefinePostUnaryOperator()

template<typename ExpressionNodeType >

void FExpressionGrammar::DefinePostUnaryOperator ( )

inline

Define a post-unary operator for the specified symbol

DefinePreUnaryOperator()

template<typename ExpressionNodeType >

void FExpressionGrammar::DefinePreUnaryOperator ( )

inline

Define a pre-unary operator for the specified symbol

GetBinaryOperatorDefParameters()

const FOpParameters * FExpressionGrammar::GetBinaryOperatorDefParameters

(

const FGuid &

TypeId

)

const

Get the binary operator precedence and associativity parameters, for the specified symbol, if any

GetGrouping()

const FGuid * FExpressionGrammar::GetGrouping

(

const FGuid &

TypeId

)

const

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

HasPostUnaryOperator()

bool FExpressionGrammar::HasPostUnaryOperator

(

const FGuid &

TypeId

)

const

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

HasPreUnaryOperator()

bool FExpressionGrammar::HasPreUnaryOperator

(

const FGuid &

TypeId

)

const

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

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The documentation for this class was generated from the following files:

• Engine/Source/Runtime/Core/Public/Misc/ExpressionParserTypes.h
• Engine/Source/Runtime/Core/Private/Misc/ExpressionParser.cpp