math.util
Class Parser

java.lang.Object
  |
  +--math.util.Parser

public class Parser

extends java.lang.Object

The class Parser is used to parse mathematical expression Strings into Expr class objects.

Since:

JDK1.1

Version:

1.1 Note: Major rewrite peformed by Peter Staab in March 2000. Hopefully fixed the problem with the unary minus problem that plagued the previous version.

Author:

Peter Staab

, Pete Fox , both for the Mathematical Visualization Project for the Department of Applied Mathematics, University of Colorado at Boulder

Field Summary

(package private) static int	ABS
(package private) static int	ACOS
(package private) static int	ACOT
(package private) static int	ACSC
(package private) static int	ASEC
(package private) static int	ASIN
(package private) static int	ATAN
(package private) static int	COS
(package private) static int	COSH
(package private) static int	COT
(package private) static int	COTH
(package private) static int	CSC
(package private) static int	CSCH
(package private) static int	EXP
(package private) static java.lang.String[]	functionStrings
(package private) static int	LN
(package private) static int	SEC
(package private) static int	SECH
(package private) static int	SIN
(package private) static int	SINH
(package private) static int	SQRT
(package private) static int	TAN
(package private) static int	TANH

Method Summary

static Function	parseFunction(java.lang.String str) This static function will parse a string representing an arithematic expression
static double	parseNumber(java.lang.String str) Method parseNumber takes a string and parses it into a number.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ABS

static final int ABS

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Constant Field Values

ACSC

static final int ACSC

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Constant Field Values

ACOT

static final int ACOT

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Constant Field Values

ACOS

static final int ACOS

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Constant Field Values

ASEC

static final int ASEC

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Constant Field Values

ASIN

static final int ASIN

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Constant Field Values

ATAN

static final int ATAN

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Constant Field Values

CSC

static final int CSC

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Constant Field Values

COT

static final int COT

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Constant Field Values

COS

static final int COS

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Constant Field Values

EXP

static final int EXP

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Constant Field Values

CSCH

static final int CSCH

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COTH

static final int COTH

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Constant Field Values

COSH

static final int COSH

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Constant Field Values

SECH

static final int SECH

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Constant Field Values

SINH

static final int SINH

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Constant Field Values

TANH

static final int TANH

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Constant Field Values

LN

static final int LN

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Constant Field Values

SEC

static final int SEC

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Constant Field Values

SIN

static final int SIN

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Constant Field Values

SQRT

static final int SQRT

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Constant Field Values

TAN

static final int TAN

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Constant Field Values

functionStrings

static final java.lang.String[] functionStrings

Method Detail

parseFunction

public static Function parseFunction(java.lang.String str)
                              throws SyntaxException

This static function will parse a string representing an arithematic expression

Parameters:

str - a String object which represents a function. for example "sin(x)" is a function object containing an operator "sin" and an operand (argument) "x".

Returns:

Expr object expr which can be evaluated and differentiated.

Throws:

SyntaxException - for invalid and unparsable String expressions

parseNumber

public static double parseNumber(java.lang.String str)
                          throws SyntaxException

Method parseNumber takes a string and parses it into a number. Similar to parseDouble and parseInt of the Double and Integer classes, except this allows mathematical constants such as pi and e, and throws a SyntaxException similar to the method parse.

Parameters:

str - a String representing a number (double, float or integer)

Returns:

a double value of the input string.

Throws:

SyntaxException - if the string cannot be parsed to a number.