org.statcato.calculator

Class MathExpParserComplete

java.lang.Object

org.statcato.calculator.MathExpParserComplete

public class MathExpParserComplete
extends java.lang.Object

A parser for mathematical expressions using the recurive descent algorithm. Acceptable expressions are defined by the following grammar:

E -> T { ("+" | "-") T}
T -> F { ("*" | "/") F}
F -> P {"^" F}
P -> v | "(" E ")" | "-" T | func_name"(" E ")" | Cx | "'" L "'"
L -> column_label

where expressions enclosed by { } can appear zero or more times.

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
MathExpParserComplete(Spreadsheet sp)

Method Summary

Modifier and Type	Method and Description
java.lang.String	getError() Returns error message from the scanner.
CompUnit	parse(java.lang.String exp, boolean isRadian) Parses the given expression.
CompUnit	S() Parses a statement.

Methods inherited from class java.lang.Object

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

Constructor Detail

MathExpParserComplete

public MathExpParserComplete(Spreadsheet sp)

Method Detail

parse

public CompUnit parse(java.lang.String exp,
                      boolean isRadian)

Parses the given expression.

Parameters:

exp - expression in string

isRadian - boolean value of whether radians are used

getError

public java.lang.String getError()

Returns error message from the scanner.

Returns:

error string

S

public CompUnit S()

Parses a statement. S->E

Returns:

the value of a statement