Package edu.cmu.tetrad.calculator.parser

Class ExpressionLexer

java.lang.Object

edu.cmu.tetrad.calculator.parser.ExpressionLexer

public class ExpressionLexer
extends Object

Parses the tokens of an expression.

Version:

$Id: $Id

Author:

Tyler Gibson

Constructor Summary

Constructors

Constructor	Description
ExpressionLexer(CharSequence seq)	Constructor for ExpressionLexer.

Method Summary

Modifier and Type	Method	Description
int	getCurrentOffset()	Getter for the field currentOffset.
int	getNextOffset()	Getter for the field nextOffset.
String	getTokenString()	getTokenString.
final Token	nextToken()	nextToken.
final Token	nextTokenIncludingWhitespace()	nextTokenIncludingWhitespace.

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionLexer

public ExpressionLexer(CharSequence seq)

Constructor for ExpressionLexer.

Parameters:

seq - a CharSequence object

Method Details

nextToken

public final Token nextToken()

nextToken.

Returns:

the type of the next token. For words and quoted charSequence tokens, the charSequence that the token represents can be fetched by calling the getString method.

nextTokenIncludingWhitespace

public final Token nextTokenIncludingWhitespace()

nextTokenIncludingWhitespace.

Returns:

a Token object

getTokenString

public String getTokenString()

getTokenString.

Returns:

the string corresponding to the last token lexed.

getCurrentOffset

public int getCurrentOffset()

Getter for the field currentOffset.

Returns:

the previous offset, before the getModel token was read (i.e. the offset of the getModel token.

getNextOffset

public int getNextOffset()

Getter for the field nextOffset.

Returns:

the getModel offset.