jminusminus

Class Scanner

java.lang.Object

jminusminus.Scanner

 class Scanner
extends Object

A lexical analyzer for j--, that has no backtracking mechanism. When you add a new token to the scanner, you must also add an entry in the TokenKind enum in TokenInfo.java specifying the kind and image of the new token.

Field Summary

Fields

Modifier and Type	Field and Description
static char	EOFCH End of file character.

Constructor Summary

Constructors

Constructor and Description
Scanner(String fileName) Construct a Scanner object.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	errorHasOccurred() Has an error occurred up to now in lexical analysis?
String	fileName() The name of the source file.
TokenInfo	getNextToken() Scan the next token from input.

Methods inherited from class java.lang.Object

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

Field Detail

EOFCH

public static final char EOFCH

End of file character.

See Also:

Constant Field Values

Constructor Detail

Scanner

public Scanner(String fileName)
        throws FileNotFoundException

Construct a Scanner object.

Parameters:

fileName - the name of the file containing the source.

Throws:

FileNotFoundException - when the named file cannot be found.

Method Detail

getNextToken

public TokenInfo getNextToken()

Scan the next token from input.

Returns:

the the next scanned token.

errorHasOccurred

public boolean errorHasOccurred()

Has an error occurred up to now in lexical analysis?

Returns:

true or false.

fileName

public String fileName()

The name of the source file.

Returns:

name of the source file.