de.hpi.fgis.dude.util.bibtex.parser
Class PseudoLexer

java.lang.Object
  de.hpi.fgis.dude.util.bibtex.parser.PseudoLexer

final class PseudoLexer
extends Object

This is not a real lexer, since BibTex is such an insane format...

Author:

henkel

Nested Class Summary

(package private) static class

PseudoLexer.Token The token class that is used within this lexer.

Constructor Summary

PseudoLexer(Reader input)
Initializes the PseudoLexer.

Method Summary

char	currentInputChar() make sure to query enforceNoEof first!
void	enforceNoEof(String expected, boolean skipWhiteSpace) make sure you call
void	scan(char expected)
int	scanAlternatives(char[] alternatives, boolean lookAhead) The return value is an index into alternatives.
void	scanBracketedString(StringBuilder targetBuffer, boolean includeOuterBraces)
String	scanEntryTypeName()
String	scanLiteral(char[] terminationSet, boolean excludeWhitespace, boolean enforceNonzero)
int	scanLiteral(char[] terminationSet, boolean excludeWhitespace, boolean enforceNonzero, StringBuilder resultTargetBuffer) The return value is an index into the termination set the result is appended in the resultTargetBuffer
String	scanQuotedString()
PseudoLexer.Token	scanTopLevelCommentOrAtOrEOF() If it's a top-level comment, result.choice will be 0, for @ 1, for EOF 2.
void	skipWhitespace()

Methods inherited from class java.lang.Object

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

Constructor Detail

PseudoLexer

PseudoLexer(Reader input)
      throws IOException

Initializes the PseudoLexer.

Parameters:

input - The reader that is used internally.

Throws:

IOException - If an error occurs while reading the data.

Method Detail

scanTopLevelCommentOrAtOrEOF

public PseudoLexer.Token scanTopLevelCommentOrAtOrEOF()
                                               throws IOException

If it's a top-level comment, result.choice will be 0, for @ 1, for EOF 2.

Returns:

The next token.

Throws:

IOException - If an error occurs while reading the data.

scanAlternatives

public final int scanAlternatives(char[] alternatives,
                                  boolean lookAhead)
                           throws IOException,
                                  ParseException

The return value is an index into alternatives. If lookAhead is true we will not move forward ...

Parameters:

alternatives - ?

lookAhead - ?

Returns:

int ?

Throws:

IOException - If an error occurs during the reading process.

ParseException - If a parsing error occurs.

scanLiteral

public String scanLiteral(char[] terminationSet,
                          boolean excludeWhitespace,
                          boolean enforceNonzero)
                   throws ParseException,
                          IOException

Parameters:

terminationSet -

excludeWhitespace -

enforceNonzero -

Returns:

String

Throws:

ParseException

IOException

scanLiteral

public int scanLiteral(char[] terminationSet,
                       boolean excludeWhitespace,
                       boolean enforceNonzero,
                       StringBuilder resultTargetBuffer)
                throws ParseException,
                       IOException

The return value is an index into the termination set the result is appended in the resultTargetBuffer

Parameters:

terminationSet -

excludeWhitespace -

enforceNonzero -

resultTargetBuffer -

Returns:

Token

Throws:

ParseException

IOException

scanQuotedString

public String scanQuotedString()
                        throws IOException,
                               ParseException

Returns:

String

Throws:

IOException

ParseException

scanBracketedString

public void scanBracketedString(StringBuilder targetBuffer,
                                boolean includeOuterBraces)
                         throws ParseException,
                                IOException

Parameters:

targetBuffer -

includeOuterBraces -

Throws:

ParseException

IOException

scanEntryTypeName

public String scanEntryTypeName()
                         throws ParseException,
                                IOException

Returns:

String

Throws:

ParseException

IOException

scan

public void scan(char expected)
          throws ParseException,
                 IOException

Parameters:

expected -

Throws:

ParseException

IOException

skipWhitespace

public void skipWhitespace()
                    throws IOException

Throws:

IOException

enforceNoEof

public void enforceNoEof(String expected,
                         boolean skipWhiteSpace)
                  throws ParseException,
                         IOException

make sure you call

Parameters:

expected -

skipWhiteSpace -

Throws:

ParseException

IOException

currentInputChar

public char currentInputChar()

make sure to query enforceNoEof first!

Returns:

char