graph

Class ScanWord

java.lang.Object

java.io.StreamTokenizer

graph.ScanWord

Direct Known Subclasses:

BuildGraph

public class ScanWord
extends StreamTokenizer

This class extends the StreamTokenizer class. It allows words to be defined and recognised and returned as a token. The TT_NUMBER token of the StreamTokenizer is also modified so that scientific notation is recognised.

Field Summary

Fields

Modifier and Type	Field and Description
static int	ERROR Token returned when an error is encountered
static int	STRING Token returned when a string has been found.
static int	UNKNOWN Token returned when an unknown characters match nothing

Fields inherited from class java.io.StreamTokenizer

nval, sval, TT_EOF, TT_EOL, TT_NUMBER, TT_WORD, ttype

Constructor Summary

Constructors

Constructor and Description
ScanWord(InputStream in) Instantiate the class with the parsed input stream.

Method Summary

Modifier and Type	Method and Description
void	addKeyWord(String s, int i) Add a keyword/token pair.
int	getKeyValue(String s) return the matching token given the keyword
int	nextWord() Read the input stream and return the next token found.
void	resetKeyWords() Clear the internal table containing the keyword/token pairs
void	setStringChar(char c) Set the character that delimeters a string.

Methods inherited from class java.io.StreamTokenizer

commentChar, eolIsSignificant, lineno, lowerCaseMode, nextToken, ordinaryChar, ordinaryChars, parseNumbers, pushBack, quoteChar, resetSyntax, slashSlashComments, slashStarComments, toString, whitespaceChars, wordChars

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN

public static final int UNKNOWN

Token returned when an unknown characters match nothing

See Also:

Constant Field Values

ERROR

public static final int ERROR

Token returned when an error is encountered

See Also:

Constant Field Values

STRING

public static final int STRING

Token returned when a string has been found. A string is defined to be text between matching quotes " ".

See Also:

Constant Field Values

Constructor Detail

ScanWord

public ScanWord(InputStream in)

Instantiate the class with the parsed input stream.

Parameters:

in - Input stream to read from

Method Detail

addKeyWord

public void addKeyWord(String s,
                       int i)

Add a keyword/token pair.

Parameters:

s - String contining the keyword

i - Token to return when the keyword is encountered.

getKeyValue

public int getKeyValue(String s)

return the matching token given the keyword

Parameters:

s - Keyword.

resetKeyWords

public void resetKeyWords()

Clear the internal table containing the keyword/token pairs

nextWord

public int nextWord()

Read the input stream and return the next token found.

setStringChar

public void setStringChar(char c)

Set the character that delimeters a string.

Parameters:

c - character to delimeter strings. Default is ".