org.cheffo.jeplite
Class ParseException

java.lang.Object
  |
  +--java.lang.Throwable
        |
        +--java.lang.Exception
              |
              +--org.cheffo.jeplite.ParseException

All Implemented Interfaces:

java.io.Serializable

public class ParseException

extends java.lang.Exception

See Also:

Serialized Form

Field Summary

Token	currentToken This is the last token that has been consumed successfully.
protected static java.lang.String	eol The end of line string for this machine.
int[][]	expectedTokenSequences Each entry in this array is an array of integers.
protected boolean	specialConstructor This variable determines which constructor was used to create this object and thereby affects the semantics of the "getMessage" method (see below).
java.lang.String[]	tokenImage This is a reference to the "tokenImage" array of the generated parser within which the parse error occurred.

Constructor Summary

ParseException()
The following constructors are for use by you for whatever purpose you can think of.

ParseException(java.lang.String message)

ParseException(Token currentTokenVal, int[][] expectedTokenSequencesVal, java.lang.String[] tokenImageVal)
This constructor is used by the method "generateParseException" in the generated parser.

ParseException(Token currentTokenVal, java.lang.String message)

Method Summary

java.lang.String	getErrorInfo() getErrorInfo() was added to the parser generated code to provide clean output instead of the standard format of Exception.toString().
java.lang.String	getMessage() This method has the standard behavior when this object has been created using the standard constructors.

Methods inherited from class java.lang.Throwable

fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

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

Field Detail

specialConstructor

protected boolean specialConstructor

This variable determines which constructor was used to create this object and thereby affects the semantics of the "getMessage" method (see below).

currentToken

public Token currentToken

This is the last token that has been consumed successfully. If this object has been created due to a parse error, the token followng this token will (therefore) be the first error token.

eol

protected static final java.lang.String eol

The end of line string for this machine.

expectedTokenSequences

public int[][] expectedTokenSequences

Each entry in this array is an array of integers. Each array of integers represents a sequence of tokens (by their ordinal values) that is expected at this point of the parse.

tokenImage

public java.lang.String[] tokenImage

This is a reference to the "tokenImage" array of the generated parser within which the parse error occurred. This array is defined in the generated ...Constants interface.

Constructor Detail

ParseException

public ParseException(Token currentTokenVal,
                      int[][] expectedTokenSequencesVal,
                      java.lang.String[] tokenImageVal)

This constructor is used by the method "generateParseException" in the generated parser. Calling this constructor generates a new object of this type with the fields "currentToken", "expectedTokenSequences", and "tokenImage" set. The boolean flag "specialConstructor" is also set to true to indicate that this constructor was used to create this object. This constructor calls its super class with the empty string to force the "toString" method of parent class "Throwable" to print the error message in the form: ParseException:

ParseException

public ParseException()

The following constructors are for use by you for whatever purpose you can think of. Constructing the exception in this manner makes the exception behave in the normal way - i.e., as documented in the class "Throwable". The fields "errorToken", "expectedTokenSequences", and "tokenImage" do not contain relevant information. The JavaCC generated code does not use these constructors.

ParseException

public ParseException(java.lang.String message)

ParseException

public ParseException(Token currentTokenVal,
                      java.lang.String message)

Method Detail

getMessage

public java.lang.String getMessage()

This method has the standard behavior when this object has been created using the standard constructors. Otherwise, it uses "currentToken" and "expectedTokenSequences" to generate a parse error message and returns it. If this object has been created due to a parse error, and you do not catch it (it gets thrown from the parser), then this method is called during the printing of the final stack trace, and hence the correct error message gets displayed.

Overrides:

getMessage in class java.lang.Throwable

getErrorInfo

public java.lang.String getErrorInfo()

getErrorInfo() was added to the parser generated code to provide clean output instead of the standard format of Exception.toString(). It returns a short description of the error that occured as well as the position of next token as part of the string.