net.sf.jett.parser
Class FormulaScanner

java.lang.Object
  net.sf.jett.parser.FormulaScanner

public class FormulaScanner
extends java.lang.Object

A FormulaScanner scans formula text and returns tokens.

Author:

Randy Gettman

Nested Class Summary

static class

FormulaScanner.Token Enumeration for the different types of Tokens in Formulas.

Constructor Summary

FormulaScanner()
Construct a FormulaScanner object, with empty input.

FormulaScanner(java.lang.String formulaText)
Construct a FormulaScanner object, with the given input.

Method Summary

java.lang.String	getCurrLexeme() Returns the current lexeme after a call to getNextToken.
FormulaScanner.Token	getNextToken() Returns the Token.
void	reset() Resets the scanner to the beginning of the formula text.
void	setFormulaText(java.lang.String formulaText) Give the FormulaScanner another formula text to scan.

Methods inherited from class java.lang.Object

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

Constructor Detail

FormulaScanner

public FormulaScanner()

Construct a FormulaScanner object, with empty input.

FormulaScanner

public FormulaScanner(java.lang.String formulaText)

Construct a FormulaScanner object, with the given input.

Parameters:

formulaText - The formula text to scan.

Method Detail

getNextToken

public FormulaScanner.Token getNextToken()

Returns the Token. After this call completes, the current lexeme is available via a call to getCurrLexeme. Starts looking at the current offset, and once the token is found, then the offset is advanced to the start of the next token.

Returns:

A Token.

See Also:

getCurrLexeme()

getCurrLexeme

public java.lang.String getCurrLexeme()

Returns the current lexeme after a call to getNextToken.

Returns:

The current lexeme, or null if getNextToken hasn't been called yet after a reset.

See Also:

getNextToken(), reset()

reset

public void reset()

Resets the scanner to the beginning of the formula text.

setFormulaText

public void setFormulaText(java.lang.String formulaText)

Give the FormulaScanner another formula text to scan. Resets to the beginning of the string.

Parameters:

formulaText - The formula text to scan.