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gnu.text
Class Lexer

java.lang.Object
  |
  +--java.io.Reader
        |
        +--gnu.text.Lexer

Direct Known Subclasses:

Lexer, LispReader

public class Lexer

extends java.io.Reader

Framework for implementing lexical scanners.

Field Summary

protected LineBufferedReader

port

Fields inherited from class java.io.Reader

lock

Constructor Summary

Lexer(LineBufferedReader port)

Lexer(LineBufferedReader port, SourceMessages messages)

Method Summary

boolean	checkErrors(java.io.PrintWriter out, int max) Returns true if any error were seen.
void	clearErrors()
void	close()
void	eofError(java.lang.String msg)
void	error(char severity, java.lang.String message)
void	error(char severity, java.lang.String filename, int line, int column, java.lang.String message)
void	error(java.lang.String message)
void	fatal(java.lang.String message)
SourceError	getErrors()
SourceMessages	getMessages()
int	peek()
int	read()
int	read(char[] buf, int offset, int length)
static long	readDigitsInBuffer(LineBufferedReader port, int radix) Read digits, up to the first non-digit or the buffer limit
int	readOptionalExponent() Read an optional signed integer.
boolean	seenErrors()
void	setMessages(SourceMessages messages)
protected void	skip_quick()
void	skip()
protected void	unread_quick()
protected void	unread()
void	unread(int ch)

Methods inherited from class java.io.Reader

mark, markSupported, read, ready, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

port

protected LineBufferedReader port

Constructor Detail

Lexer

public Lexer(LineBufferedReader port)

Lexer

public Lexer(LineBufferedReader port,
             SourceMessages messages)

Method Detail

close

public void close()
           throws java.io.IOException

Overrides:

close in class java.io.Reader

read

public int read()
         throws java.io.IOException

Overrides:

read in class java.io.Reader

read

public int read(char[] buf,
                int offset,
                int length)
         throws java.io.IOException

Overrides:

read in class java.io.Reader

unread

public void unread(int ch)
            throws java.io.IOException

peek

public int peek()
         throws java.io.IOException

skip

public void skip()
          throws java.io.IOException

unread

protected void unread()
               throws java.io.IOException

unread_quick

protected void unread_quick()
                     throws java.io.IOException

skip_quick

protected void skip_quick()
                   throws java.io.IOException

getMessages

public SourceMessages getMessages()

setMessages

public void setMessages(SourceMessages messages)

checkErrors

public boolean checkErrors(java.io.PrintWriter out,
                           int max)

Returns true if any error were seen. Prints and clears the errors.

Parameters:

out - where to write the error message to

max - maximum number of messages to print (can be 0)

getErrors

public SourceError getErrors()

seenErrors

public boolean seenErrors()

clearErrors

public void clearErrors()

error

public void error(char severity,
                  java.lang.String filename,
                  int line,
                  int column,
                  java.lang.String message)

error

public void error(char severity,
                  java.lang.String message)

error

public void error(java.lang.String message)

fatal

public void fatal(java.lang.String message)
           throws SyntaxException

eofError

public void eofError(java.lang.String msg)
              throws SyntaxException

readOptionalExponent

public int readOptionalExponent()
                         throws java.io.IOException

Read an optional signed integer. If there is no integer in the input stream, return 1. For excessively large exponents, return Integer.MIN_VALUE or Integer.MAX_VALUE.

readDigitsInBuffer

public static long readDigitsInBuffer(LineBufferedReader port,
                                      int radix)

Read digits, up to the first non-digit or the buffer limit

Returns:

the digits seen as a non-negative long, or -1 on overflow