org.codehaus.groovy.syntax.lexer
Class GroovyExpressionLexer

java.lang.Object
  org.codehaus.groovy.syntax.lexer.LexerBase
      org.codehaus.groovy.syntax.lexer.GroovyLexerBase
          org.codehaus.groovy.syntax.lexer.GroovyExpressionLexer

All Implemented Interfaces:

Delimiter, Lexer

public class GroovyExpressionLexer

extends GroovyLexerBase

implements Delimiter

Lexes Groovy, counting braces. Considers itself at end of stream when the } count exceeds the { count.

Author:

Chris Poirier

Field Summary

protected int	balance
protected boolean	delimited
protected boolean	finished

Fields inherited from class org.codehaus.groovy.syntax.lexer.GroovyLexerBase

gstringLexer, stringLexer

Fields inherited from class org.codehaus.groovy.syntax.lexer.LexerBase

delegate, source, startColumn, startLine

Constructor Summary

GroovyExpressionLexer()

Method Summary

char	consume() Eats a character from the input stream.
void	delegate(Lexer to) Delegates our duties to another Lexer.
void	delimit(boolean delimited) Turns delimiting on or off.
protected void	finish() Stops the lexer stream.
boolean	isDelimited() Returns true if the lexer is applying its delimiter policy.
boolean	isFinished() Returns true if the lexer stream is dry.
char	la(int k) Returns the next kth character, without consuming any.
Token	nextToken() Finds and returns (and consumes) the next token from the underlying stream.
protected void	restart() Restarts the lexer stream after a finish() and some intevening act (like a new source).
void	undelegate() Retakes responsibility for our duties.

Methods inherited from class org.codehaus.groovy.syntax.lexer.LexerBase

getColumn, getDelegate, getLine, getSource, getStartColumn, getStartLine, isDelegated, isExternallySourced, la, mark, readEOL, readEOL, reset, setSource, symbol, symbol, tokenizeEOL, undelegatedNextToken, unexpected, unexpected, unexpected, unsetSource

Methods inherited from class java.lang.Object

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

Field Detail

delimited

protected boolean delimited

finished

protected boolean finished

balance

protected int balance

Constructor Detail

GroovyExpressionLexer

public GroovyExpressionLexer()

Method Detail

nextToken

public Token nextToken()
                throws ReadException,
                       LexerException

Finds and returns (and consumes) the next token from the underlying stream. Returns null when out of tokens. We let the GroovyLexerBase version deal with delegation stuff.

Specified by:

nextToken in interface Lexer

Overrides:

nextToken in class GroovyLexerBase

Throws:

ReadException

LexerException

delimit

public void delimit(boolean delimited)

Turns delimiting on or off. This should affect la() and consume(). However, once the delimiter has been reached, this routine should have no effect.

Specified by:

delimit in interface Delimiter

isDelimited

public boolean isDelimited()

Returns true if the lexer is applying its delimiter policy.

Specified by:

isDelimited in interface Delimiter

isFinished

public boolean isFinished()

Returns true if the lexer stream is dry.

Specified by:

isFinished in interface Delimiter

restart

protected void restart()

Restarts the lexer stream after a finish() and some intevening act (like a new source).

finish

protected void finish()

Stops the lexer stream.

delegate

public void delegate(Lexer to)

Delegates our duties to another Lexer.

Specified by:

delegate in interface Lexer

Overrides:

delegate in class LexerBase

undelegate

public void undelegate()

Retakes responsibility for our duties.

Specified by:

undelegate in interface Lexer

Overrides:

undelegate in class LexerBase

la

public char la(int k)
        throws LexerException,
               ReadException

Returns the next kth character, without consuming any.

Specified by:

la in interface Lexer

Overrides:

la in class LexerBase

Throws:

LexerException

ReadException

consume

public char consume()
             throws LexerException,
                    ReadException

Eats a character from the input stream.

Specified by:

consume in interface Lexer

Overrides:

consume in class LexerBase

Throws:

LexerException

ReadException