Ilwis::OperationExpression Class Reference

#include <operationExpression.h>

Public Member Functions
	OperationExpression ()
	OperationExpression (const QString &expr, const SymbolTable &symtab=SymbolTable())
Parameter	parm (int index, bool in=true) const
Parameter	parm (const QString key, bool toLower=true, bool in=true) const
QString	name (bool toLower=true) const
int	parameterCount (bool in=true) const
bool	isValid () const
QUrl	metaUrl (bool simple=true) const
void	setExpression (const QString &e, const SymbolTable &symtab)
bool	matchesParameterCount (const QString &match, bool in=true) const
QString	toString () const

Detailed Description

The OperationExpression class a parser for fully defined expressions. This class will parse expressions of the type function and command and split it into its parts. The assumption is that the expression is already parsed to a level that all parts can not be parsed further. more complex expressions need first go to the calculator to be reduced to this level. Note that functions have a fixed order of parameters v = func(a,b) is different from b fun(b,a)

Constructor & Destructor Documentation

OperationExpression::OperationExpression

(

)

OperationExpression empty expression

OperationExpression::OperationExpression	(	const QString &	expr,
		const SymbolTable &	symtab = SymbolTable()
	)

Constructs an expression object of an textual expression.

Expressions have either the form of a function which takes the form of output={id}(paramteres*) or a command with the form {id} (paramters)*. The class will splt this in *ids, input parametrs and return parameters

Parameters

expr	textual form of the expression
type	enum marking the type of the expression, function or command.

Member Function Documentation

bool OperationExpression::isValid

(

)

const

isValid minimum condition for an expression to be valid, it must have a name

An expression might have no return types and no parameters but it always must have a name

Returns

true if there is a name

QString OperationExpression::name

(

bool

toLower = true

)

const

name returns the name of the command or function

Parameters

toLower

toLower name will be in lowercase (or not)

Returns

the function/command id

int OperationExpression::parameterCount

(

bool

in = true

)

const

parameterCount returns the number of input or outparameters

Parameters

in	input or output

Returns

count

Parameter OperationExpression::parm	(	int	index,
		bool	in = true
	)		const

returns the parameter at a defined placed in either the input or the output

Parameters

index	rank order number of the parameters to be returned
in	input parameter or output parameter

Returns

a parameter

Parameter OperationExpression::parm	(	const QString	key,
		bool	toLower = true,
		bool	in = true
	)		const

returns the parameter at a defined name in either the input or the output

Parameters

key	name of the parameters to be returned
toLower	name will be in lowercase (or not)
in	input parameter or output parameter

Returns

a parameter

---

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

• ilwisobjects/operation/operationExpression.h
• ilwisobjects/operation/operationExpression.cpp