Package jminusminus

Class Scanner

java.lang.Object

jminusminus.Scanner

class Scanner
extends Object

A lexical analyzer for j--, that has no backtracking mechanism.

Field Summary

Fields

Modifier and Type	Field	Description
static final char	EOFCH

Constructor Summary

Constructors

Constructor	Description
Scanner(String fileName)	Constructs a Scanner from a file name.

Method Summary

Modifier and Type	Method	Description
boolean	errorHasOccurred()	Returns true if an error has occurred, and false otherwise.
String	fileName()	Returns the name of the source file.
TokenInfo	getNextToken()	Scans and returns the next token from input.

Methods inherited from class java.lang.Object

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

Field Details

EOFCH

public static final char EOFCH

See Also:

• Constant Field Values

Constructor Details

Scanner

public Scanner(String fileName)
        throws FileNotFoundException

Constructs a Scanner from a file name.

Parameters:

fileName - name of the source file.

Throws:

FileNotFoundException - when the named file cannot be found.

Method Details

getNextToken

public TokenInfo getNextToken()

Scans and returns the next token from input.

Returns:

the next scanned token.

errorHasOccurred

public boolean errorHasOccurred()

Returns true if an error has occurred, and false otherwise.

Returns:

true if an error has occurred, and false otherwise.

fileName

public String fileName()

Returns the name of the source file.

Returns:

the name of the source file.