CDataFunc Class Reference

#include <DataFunc.h>

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Detailed Description

GreyLab function parser and evaluator.

Reads, parses and interprets human readable Infix functions into a Reverse Polish Notation for execution and performs the operations on data.

Definition at line 47 of file DataFunc.h.


Public Types
enum	status { OK, NONENDING_VAR, UNKNOWN_TAG, UNMATCHED_PARENTHESES, NONENDING_OP, TOO_FEW_VARS, INVALID_SEPARATOR }
Public Member Functions
	CDataFunc ()
	Initialise CDataFunc.
	~CDataFunc ()
	Destruct CDataFunc.
status	InfixToRPN (char *input)
	Converts a infix string into RPN stack.
double	Evaluate (double x, double y, double z, int cols, double coldata[])
	Evaluates an RPN stack.
Public Attributes
bool	valid
	Valid function?
Private Member Functions
int	FindTagID (char *string)
	Searches the list of tokens for a particular tag.
status	TestEvaluate (void)
	Simple evaluation check.
Private Attributes
struct CDataFunc::token *	queue
	RPN token entry.
real *	values
	List of values.
int	nValues
	Number of values.
int	nQueue
	Number of tokens in the list.
Static Private Attributes
static op *	ops = NULL
	The list of useable operators.
static int	nOps = 0
	Number of operators.
static int	instances = 0
	Instances of this class (for cleanup handling).
Classes
struct	op
	Mathematical operator details. More...
struct	token
	RPN token entry. More...

Member Enumeration Documentation

enum CDataFunc::status

Enumerator:

OK
NONENDING_VAR
UNKNOWN_TAG
UNMATCHED_PARENTHESES
NONENDING_OP
TOO_FEW_VARS
INVALID_SEPARATOR

Definition at line 50 of file DataFunc.h.

Constructor & Destructor Documentation

CDataFunc::CDataFunc ( )

Initialise CDataFunc.

If there are no instances of the class then the array of available operators is built.

Definition at line 59 of file DataFunc.cpp.

References BUILDOP, instances, nOps, nQueue, nValues, ops, queue, valid, and values.

CDataFunc::~CDataFunc ( )

Destruct CDataFunc.

If this is the last instances of the class then delete the array of available operators.

Definition at line 124 of file DataFunc.cpp.

References instances, nOps, ops, queue, and values.

Member Function Documentation

int CDataFunc::FindTagID ( char * string ) [private]

Searches the list of tokens for a particular tag.

Parameters:

string

Name of the operator to search for.

Returns:: ID of the found tag or -1 if not found.

Definition at line 146 of file DataFunc.cpp.

References nOps, and ops.

Referenced by InfixToRPN().

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CDataFunc::status CDataFunc::TestEvaluate ( void ) [private]

Simple evaluation check.

Checks that after evaluation we are just left with the answer on the stack.

Returns:: Status of the test evaluation as a CDataFunc::status.

Definition at line 681 of file DataFunc.cpp.

References CDataFunc::op::args, nQueue, OK, ops, queue, CDataFunc::token::tagid, TOO_FEW_VARS, and valid.

Referenced by InfixToRPN().

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CDataFunc::status CDataFunc::InfixToRPN ( char * input )

Converts a infix string into RPN stack.

Parameters:

input

Input equation.

Remarks:: The resulting RPN stack is in the array CDataFunc::queue.

Returns:: Error code of the parsing as a CDataFunc::status.

Definition at line 164 of file DataFunc.cpp.

References FindTagID(), INVALID_SEPARATOR, CDataFunc::op::lassociative, CDataFunc::token::next, NONNUMBER, nQueue, nValues, ops, CDataFunc::op::precedence, CDataFunc::token::prev, queue, CDataFunc::token::tagid, TestEvaluate(), UNKNOWN_TAG, UNMATCHED_PARENTHESES, valid, CDataFunc::token::value, and values.

Referenced by DrawPaletteDialog::cmdUpdateAllData(), and GreyLabWindow::renderObjects().

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double CDataFunc::Evaluate	(	double	x,
		double	y,
		double	z,
		int	cols,
		double	coldata[]
	)

Evaluates an RPN stack.

Evaluates the RPN stack in CDataFunc::queue.

Parameters:

	x	X coordinate of the datapoint.
	y	Y coordinate of the datapoint.
	z	Z value of the datapoint.
	cols	Number of columns in coldata.
	coldata	Values in the other columns of the datapoint.