ExpressionParser Class Reference

Expression parser. More...

#include <base/math/ExpressionParser.h>

Inherits Object.

Public Member Functions
	ExpressionParser (const String &expression, ExpressionProvider &provider) noexcept
void	parse ()
const List< Node > &	getExpression () const noexcept
bool	getAutoRegister () const noexcept
void	setAutoRegister (bool value) noexcept
const HashTable< String, Node > &	getUnknowns () const noexcept
bool	hasUnknowns () const noexcept
String	getString () const
	~ExpressionParser () noexcept

Protected Types
typedef ExpressionEvaluator::Node	Node
typedef ExpressionEvaluator::Operation	Operation

Protected Member Functions
void	pop ()
void	push (Operation operation)
void	readIdentifier ()
void	readValue ()

Protected Attributes
bool	autoRegister = false
HashTable< String, Node >	unknowns
HashTable< unsigned int, String >	unknownsId
String	expression
ExpressionProvider &	provider
Stack< Operation >	stack
List< Node >	nodes
unsigned int	operands = 0
bool	unary = false
unsigned int	index = 0
unsigned int	length = 0

Detailed Description

Expression parser.

Arithmetic expression parser.

See also

ExpressionProvider

ExpressionEvaluator

Version

1.0

Examples

testsuite/eval.cpp.

Constructor & Destructor Documentation

ExpressionParser()

ExpressionParser::ExpressionParser ( const String &  expression, ExpressionProvider &  provider  )

noexcept

Initializes an expression parser.

Parameters

expression	The string representation of the expression to be parsed (e.g. "4+5*x/7").
provider	The expression provider.

~ExpressionParser()

ExpressionParser::~ExpressionParser ( )

noexcept

Destroys the expression parser.

Member Function Documentation

getAutoRegister()

bool ExpressionParser::getAutoRegister ( ) const

inlinenoexcept

Returns the auto-register mode.

getExpression()

const List<Node>& ExpressionParser::getExpression ( ) const

inlinenoexcept

Returns the result of the parser.

Examples

testsuite/eval.cpp.

getString()

String ExpressionParser::getString

(

)

const

Builds string expression from internal representation.

Examples

testsuite/eval.cpp.

getUnknowns()

const HashTable<String, Node>& ExpressionParser::getUnknowns ( ) const

inlinenoexcept

Returns the unknowns.

Examples

testsuite/eval.cpp.

hasUnknowns()

bool ExpressionParser::hasUnknowns ( ) const

inlinenoexcept

Returns true if the expression contains unknowns.

Examples

testsuite/eval.cpp.

parse()

void ExpressionParser::parse

(

)

Parses the specified arithmetic expression representation.

Examples

testsuite/eval.cpp.

pop()

void ExpressionParser::pop ( )

protected

Pops one operation from the stack.

push()

void ExpressionParser::push ( Operation  operation )

protected

Pushed the specified operation onto the stack.

readIdentifier()

void ExpressionParser::readIdentifier ( )

protected

Reads an identifier from the representation.

readValue()

void ExpressionParser::readValue ( )

protected

Reads a number from the representation.

setAutoRegister()

void ExpressionParser::setAutoRegister ( bool  value )

inlinenoexcept

Sets the auto-register mode.

Examples

testsuite/eval.cpp.

Member Data Documentation

autoRegister

bool ExpressionParser::autoRegister = false

protected

The auto-register mode. Default is disabled.

expression

String ExpressionParser::expression

protected

The expression representation.

index

unsigned int ExpressionParser::index = 0

protected

The current position in the representation.

length

unsigned int ExpressionParser::length = 0

protected

The length of the expression.

nodes

List<Node> ExpressionParser::nodes

protected

List holding the parsed expression.

operands

unsigned int ExpressionParser::operands = 0

protected

Specifies the current number of operands.

provider

ExpressionProvider& ExpressionParser::provider

protected

The expression provider.

stack

Stack<Operation> ExpressionParser::stack

protected

Stack holding operations.

unary

bool ExpressionParser::unary = false

protected

Specifies that an unary expression is expected.

unknowns

HashTable<String, Node> ExpressionParser::unknowns

protected

Unknowns.

unknownsId

HashTable<unsigned int, String> ExpressionParser::unknownsId

protected

Lookup of the unknowns by id.