org.codehaus.groovy.syntax.lexer
Class GroovyLexer

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

All Implemented Interfaces:

Lexer

public class GroovyLexer

extends GroovyLexerBase

Identifies and returns tokens from a source text. nextToken() is the primary entry point. This is the primary lexer for the Groovy language. It can delegate operations, but will not accept being delegated to.

Author:

Bob Mcwhirter, James Strachan, John Wilson, Chris Poirier

Field Summary

private boolean	boundary
private char[]	buf
private int	charsInBuffer
private CharStream	charStream
private int[]	charWidth
protected int	column
private int	cur
private boolean	eosRead
private boolean	escapeLookahead
private char	escapeLookaheadChar
protected int	line

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

GroovyLexer(CharStream charStream)
Initializes the Lexer from an opened CharStream.

Method Summary

char	consume() Eats a character from the input stream.
private void	fillBuffer() Fills the lookahead buffer from the stream.
CharStream	getCharStream() Returns the underlying CharStream.
int	getColumn() Returns the current column within that line.
int	getLine() Returns the current line number.
char	la(int k) Returns the next kth character, without consuming any.
void	setSource(Lexer source) Refuses to set a source.
void	unsetSource() Similarly refuses to clear a source.

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

nextToken

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

delegate, getDelegate, getSource, getStartColumn, getStartLine, isDelegated, isExternallySourced, la, mark, readEOL, readEOL, reset, symbol, symbol, tokenizeEOL, undelegate, undelegatedNextToken, unexpected, unexpected, unexpected

Methods inherited from class java.lang.Object

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

Field Detail

charStream

private CharStream charStream

line

protected int line

column

protected int column

buf

private final char[] buf

charWidth

private final int[] charWidth

cur

private int cur

charsInBuffer

private int charsInBuffer

eosRead

private boolean eosRead

escapeLookahead

private boolean escapeLookahead

escapeLookaheadChar

private char escapeLookaheadChar

boundary

private boolean boundary

Constructor Detail

GroovyLexer

public GroovyLexer(CharStream charStream)

Initializes the Lexer from an opened CharStream.

Method Detail

getCharStream

public CharStream getCharStream()

Returns the underlying CharStream.

setSource

public void setSource(Lexer source)

Refuses to set a source.

Specified by:

setSource in interface Lexer

Overrides:

setSource in class LexerBase

unsetSource

public void unsetSource()

Similarly refuses to clear a source.

Specified by:

unsetSource in interface Lexer

Overrides:

unsetSource in class LexerBase

getLine

public int getLine()

Returns the current line number.

Specified by:

getLine in interface Lexer

Overrides:

getLine in class LexerBase

getColumn

public int getColumn()

Returns the current column within that line.

Specified by:

getColumn in interface Lexer

Overrides:

getColumn 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. We don't support sources here, as we own the CharStream on which we are working.

Specified by:

consume in interface Lexer

Overrides:

consume in class LexerBase

Throws:

LexerException

ReadException

fillBuffer

private void fillBuffer()
                 throws ReadException,
                        LexerException

Fills the lookahead buffer from the stream.

Throws:

ReadException

LexerException