MathExpressionParser Class Reference

parses a string with a mathematical expression. More...

List of all members.

Public Member Functions
	MathExpressionParser (const char *str=0)
void	setInput (const char *s)
MathExpression *	parse () const
const char *	errMsg () const
Static Public Member Functions
static BufferString	varNameOf (const char *fullvarnm, int *shift=0)
static MathExpression::VarType	varTypeOf (const char *)
static int	constIdxOf (const char *)
Protected Member Functions
MathExpression *	parse (const char *) const
Protected Attributes
BufferString	inp_
BufferString	errmsg_

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Detailed Description

parses a string with a mathematical expression.

The expression can consist of constants, variables, operators and standard mathematical functions. A constant can be any number like 3, -5, 3e-5, or pi. Everything that does not start with a digit and is not an operator is treated as a variable. An operator can be either:

+, -, *, /, ^, >, <, <=, >=, ==, !=, &&, ||, cond ? true stat : false stat, or |abs|

A mathematical function can be either:

sin(), cos(), tan(), ln(), log(), exp() or sqrt().

If the parser returns null, it couldn't parse the expression. Then, errmsg_ should contain info.

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Constructor & Destructor Documentation

MathExpressionParser::MathExpressionParser

(

const char *

str = 0

)

[inline]

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Member Function Documentation

static int MathExpressionParser::constIdxOf

(

const char *

)

[static]

const char* MathExpressionParser::errMsg

(

)

const [inline]

MathExpression* MathExpressionParser::parse

(

)

const

MathExpression* MathExpressionParser::parse

(

const char *

)

const [protected]

void MathExpressionParser::setInput

(

const char *

s

)

[inline]

static BufferString MathExpressionParser::varNameOf	(	const char *	fullvarnm,
		int *	shift = 0
	)			[static]

static MathExpression::VarType MathExpressionParser::varTypeOf

(

const char *

)

[static]

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Member Data Documentation

BufferString MathExpressionParser::errmsg_ [mutable, protected]

BufferString MathExpressionParser::inp_ [protected]