stx::ParseNode Class Reference

ParseNode is the abstract node interface of different parse nodes. More...

#include <ExpressionParser.h>

Inheritance diagram for stx::ParseNode:

List of all members.

Public Member Functions
virtual	~ParseNode ()
	Virtual destructor so derived classes can deallocate their children nodes.
virtual AnyScalar	evaluate (const class SymbolTable &st=BasicSymbolTable()) const=0
	Function to recursively evaluate the contained parse tree and retrieve the calculated scalar value based on the given symbol table.
virtual bool	evaluate_const (AnyScalar *dest) const=0
	(Internal) Function to check if the subtree evaluates to a constant expression.
virtual std::string	toString () const=0
	Return the parsed expression as a string, which can be parsed again.
Protected Member Functions
	ParseNode ()
	Usual construction.
	ParseNode (const ParseNode &pn)
	Disable copy construction.
ParseNode &	operator= (const ParseNode &pn)
	And disable assignment.

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Detailed Description

ParseNode is the abstract node interface of different parse nodes.

From these parse nodes the the ExpressionParser constructs a tree which can be evaluated using different SymbolTable settings.

Definition at line 267 of file ExpressionParser.h.

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Constructor & Destructor Documentation

virtual stx::ParseNode::~ParseNode

(

)

[inline, virtual]

Virtual destructor so derived classes can deallocate their children nodes.

Definition at line 283 of file ExpressionParser.h.

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Member Function Documentation

virtual AnyScalar stx::ParseNode::evaluate

(

const class SymbolTable &

st = BasicSymbolTable()

)

const [pure virtual]

Function to recursively evaluate the contained parse tree and retrieve the calculated scalar value based on the given symbol table.

Implemented in stx::Grammar::PNConstant, stx::Grammar::PNVariable, stx::Grammar::PNFunction, stx::Grammar::PNUnaryArithmExpr, stx::Grammar::PNBinaryArithmExpr, stx::Grammar::PNCastExpr, stx::Grammar::PNBinaryComparisonExpr, and stx::Grammar::PNBinaryLogicExpr.

Referenced by stx::Grammar::PNBinaryLogicExpr::evaluate(), stx::Grammar::PNBinaryComparisonExpr::evaluate(), stx::Grammar::PNCastExpr::evaluate(), stx::Grammar::PNBinaryArithmExpr::evaluate(), and stx::Grammar::PNUnaryArithmExpr::evaluate().

virtual bool stx::ParseNode::evaluate_const

(

AnyScalar *

dest

)

const [pure virtual]

(Internal) Function to check if the subtree evaluates to a constant expression.

If dest == NULL then do a static check whether the node is always a constant (ignoring subnodes), if dest != NULL try to calculate the constant value and type recursively, thus the return value can be true for a non-constant tree node.

Implemented in stx::Grammar::PNConstant, stx::Grammar::PNVariable, stx::Grammar::PNFunction, stx::Grammar::PNUnaryArithmExpr, stx::Grammar::PNBinaryArithmExpr, stx::Grammar::PNCastExpr, stx::Grammar::PNBinaryComparisonExpr, and stx::Grammar::PNBinaryLogicExpr.

Referenced by stx::Grammar::build_expr(), stx::Grammar::PNBinaryLogicExpr::evaluate_const(), stx::Grammar::PNBinaryComparisonExpr::evaluate_const(), stx::Grammar::PNCastExpr::evaluate_const(), stx::Grammar::PNBinaryArithmExpr::evaluate_const(), and stx::Grammar::PNUnaryArithmExpr::evaluate_const().

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

• libstx-exparser/ExpressionParser.h

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