gnsstk::Expression Class Reference

Detailed Description

Definition at line 88 of file Expression.hpp.

#include <Expression.hpp>

Classes
class	BinOpNode
class	ConstNode
class	ExpNode
class	FuncOpNode
class	Token
class	VarNode

Public Member Functions
bool	canEvaluate (void)
double	evaluate (void)
	Expression (const Expression &rhs)
	Expression (const std::string &str)
	Expression (void)
Expression &	operator= (const Expression &rhs)
	Assignment operator. More...
void	print (std::ostream &ostr) const
bool	set (const char *name, double value)
bool	set (const std::string name, double value)
bool	setGPSConstants (void)
bool	setRinexObs (const RinexObsData::RinexObsTypeMap &rotm)
bool	setSvObsEpoch (const SvObsEpoch &soe)
	~Expression (void)
	Destructor. More...

Private Member Functions
void	buildExpressionTree (void)
int	countResolvedTokens (void)
void	defineOperators (void)
void	dumpLists (void)
void	setExpression (const std::string &newExpression)
void	tokenize (const std::string &str)

Private Attributes
std::list< ExpNode * >	eList
ExpNode *	root
std::list< Token >	tList

Static Private Attributes
static std::map< std::string, std::string >	argumentPatternMap
static std::map< std::string, int >	operatorMap
static bool	operatorsDefined = false

Constructor & Destructor Documentation

Expression() [1/3]

gnsstk::Expression::Expression

(

void

)

Empty constructor

Definition at line 175 of file Expression.cpp.

Expression() [2/3]

gnsstk::Expression::Expression

(

const std::string &

str

)

Constructor.

Parameters

str	Expression to be evaluated.

Definition at line 161 of file Expression.cpp.

Expression() [3/3]

gnsstk::Expression::Expression

(

const Expression &

rhs

)

Copy constructor.

Parameters

rhs	Expression to be copied.

Note

variable values are not copied.

Definition at line 182 of file Expression.cpp.

~Expression()

gnsstk::Expression::~Expression

(

void

)

Destructor.

Definition at line 259 of file Expression.cpp.

Member Function Documentation

buildExpressionTree()

void gnsstk::Expression::buildExpressionTree ( void  )

private

Definition at line 411 of file Expression.cpp.

canEvaluate()

bool gnsstk::Expression::canEvaluate

(

void

)

Checks in advance if all variables have been set.

Returns

True if all variables are set.

Definition at line 560 of file Expression.cpp.

countResolvedTokens()

int gnsstk::Expression::countResolvedTokens ( void  )

private

Definition at line 395 of file Expression.cpp.

defineOperators()

void gnsstk::Expression::defineOperators ( void  )

private

Definition at line 217 of file Expression.cpp.

dumpLists()

void gnsstk::Expression::dumpLists ( void  )

private

Definition at line 198 of file Expression.cpp.

evaluate()

double gnsstk::Expression::evaluate ( void  )

inline

Returns the numerical value of the expression. Note that if the expression contains variables, those variables must be set.

Exceptions

ExpressionException

Definition at line 174 of file Expression.hpp.

operator=()

Expression & gnsstk::Expression::operator=

(

const Expression &

rhs

)

Assignment operator.

Definition at line 190 of file Expression.cpp.

print()

void gnsstk::Expression::print ( std::ostream &  ostr ) const

inline

Writes the expression out to a stream.

Definition at line 180 of file Expression.hpp.

set() [1/2]

bool gnsstk::Expression::set ( const char *  name, double  value  )

inline

Sets a variable in the expression to the input value. All instances of the variable are set to this value. This is required before an expression can be evaluated, if the expression contains variables. In the search, case is not important (e.g., "c" and "C" would be a match).

Parameters

name	Name of the variable to set
value	Value to set the variable to.

Returns

True if the variable was found.

Definition at line 138 of file Expression.hpp.

set() [2/2]

bool gnsstk::Expression::set	(	const std::string	name,
		double	value
	)

Sets a variable in the expression to the input value. All instances of the variable are set to this value. This is required before an expression can be evaluated, if the expression contains variables.

Parameters

name	Name of the variable to set
value	Value to set the variable to.

Returns

True if the variable was found.

Definition at line 533 of file Expression.cpp.

setExpression()

void gnsstk::Expression::setExpression ( const std::string &  newExpression )

private

Definition at line 168 of file Expression.cpp.

setGPSConstants()

bool gnsstk::Expression::setGPSConstants

(

void

)

Sets multiple variables in the expression to constants associated with GPS. Predefined variables include: PI; C (meters per second); L1 and L2, carrier frequencies in cycles per second; WL1 and WL2, carrier wavelengths. As with other variables, the case is insensitive.

Returns

True if any GPS related constants were found

Definition at line 581 of file Expression.cpp.

setRinexObs()

bool gnsstk::Expression::setRinexObs

(

const RinexObsData::RinexObsTypeMap &

rotm

)

Sets multiple variables in the expression using values stored in a RinexObsType stucture. This structure is nested within the RinexObsData class.

Parameters

rotm	Map of RinexObsType to RinexObsDatum

Returns

True if an obs variable was found.

Definition at line 599 of file Expression.cpp.

setSvObsEpoch()

bool gnsstk::Expression::setSvObsEpoch

(

const SvObsEpoch &

soe

)

Definition at line 613 of file Expression.cpp.

tokenize()

void gnsstk::Expression::tokenize ( const std::string &  str )

private

Definition at line 266 of file Expression.cpp.

Member Data Documentation

argumentPatternMap

std::map< std::string, std::string > gnsstk::Expression::argumentPatternMap

staticprivate

Definition at line 344 of file Expression.hpp.

eList

std::list<ExpNode *> gnsstk::Expression::eList

private

Definition at line 348 of file Expression.hpp.

operatorMap

std::map< std::string, int > gnsstk::Expression::operatorMap

staticprivate

Definition at line 343 of file Expression.hpp.

operatorsDefined

bool gnsstk::Expression::operatorsDefined = false

staticprivate

Definition at line 345 of file Expression.hpp.

root

ExpNode* gnsstk::Expression::root

private

Definition at line 349 of file Expression.hpp.

tList

std::list<Token> gnsstk::Expression::tList

private

Definition at line 347 of file Expression.hpp.

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

• Expression.hpp
• Expression.cpp