marf.nlp.Parsing
Class SyntaxError

java.lang.Object
  java.lang.Throwable
      java.lang.Exception
          marf.util.MARFException
              marf.nlp.NLPException
                  marf.nlp.Parsing.CompilerError
                      marf.nlp.Parsing.SyntaxError

All Implemented Interfaces:

java.io.Serializable

public class SyntaxError

extends CompilerError

Represents a Syntax Error.

$Id: SyntaxError.java,v 1.18 2006/01/15 20:51:55 mokhov Exp $

Since:

0.3.0.2

Version:

$Revision: 1.18 $

Author:

Serguei Mokhov

See Also:

Serialized Form

Field Summary

static int	ERR_CUSTOM Custom error message as alternative to 'unknown'.
static int	ERR_GENERAL_SYNTAX_ERROR General Syntax Error.
static int	ERR_MISMATCHED_PARENS Mismatched Parenthesis Error.
static int	ERR_MISSING_SEMICOLON Unterminated statement or declaration.
static int	ERR_NO_PROGRAM No "main()" program Error.
protected Token	oFaultingToken Token information at which Parser encountered the error.
protected static int	POP Recovery action code, specifying that to recover from an error one needs to pop tokens from the stack.
protected static int	SCAN Recovery action code specifying that one needs to keep scanning to recover.

Fields inherited from class marf.nlp.Parsing.CompilerError

iCurrentErrorCode, iLineNo, OK

Fields inherited from class marf.util.MARFException

strMessage

Constructor Summary

SyntaxError()
Default constructor that merely calls super().

SyntaxError(java.lang.Exception poException)
Constructs SyntaxError with wrapped Exception object.

SyntaxError(int piErrorCode)
Constructor with the error code.

SyntaxError(int piErrorCode, Token poFaultingToken)
Constructor with the error code and its cause.

SyntaxError(java.lang.String pstrEncodedCode)
Constructs a syntax error with the encoded code.

SyntaxError(java.lang.String pstrMessage, java.lang.Exception poException)
Constructs SyntaxError with wrapped Exception object and a custom error message.

SyntaxError(Token poFaultingToken, java.lang.String pstrCustomErrorMessage)
Constructor 2 - An Alterantive to Unknown Error.

Method Summary

static java.lang.String	getMARFSourceCodeRevision() Retrieves class' revision.
boolean	isPopRecoveryAction() Checks whether the recovery action to follow this syntax error is to "pop last token from the stack".
boolean	isScanRecoveryAction() Checks whether the recovery action to follow this syntax error is to "keep scanning".
boolean	serialize(int piOperation, java.io.FileWriter poFileWriter) Serialization routine.
void	setErrorCode(java.lang.String pstrCode) Sets error code given its string representation (as in token's lexeme).
void	setLineNo(int piLineNo) Updates location.
void	setPopRecoveryAction() Sets current error recovery action to SCAN.
void	setScanRecoveryAction() Sets current error recovery action to SCAN.
void	updateTokenInfo(Token poFaultingToken) Allows updating the state of an error, since the info might not be initially available (as in the TT, for example).

Methods inherited from class marf.nlp.Parsing.CompilerError

getCurrentErrorCode, getLineNo

Methods inherited from class marf.util.MARFException

getMessage, toString

Methods inherited from class java.lang.Throwable

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

Methods inherited from class java.lang.Object

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

Field Detail

ERR_GENERAL_SYNTAX_ERROR

public static final int ERR_GENERAL_SYNTAX_ERROR

General Syntax Error.

See Also:

Constant Field Values

ERR_MISMATCHED_PARENS

public static final int ERR_MISMATCHED_PARENS

Mismatched Parenthesis Error.

See Also:

Constant Field Values

ERR_NO_PROGRAM

public static final int ERR_NO_PROGRAM

No "main()" program Error.

See Also:

Constant Field Values

ERR_MISSING_SEMICOLON

public static final int ERR_MISSING_SEMICOLON

Unterminated statement or declaration.

See Also:

Constant Field Values

ERR_CUSTOM

public static final int ERR_CUSTOM

Custom error message as alternative to 'unknown'.

See Also:

Constant Field Values

oFaultingToken

protected Token oFaultingToken

Token information at which Parser encountered the error.

Since:

October 2, 2001

POP

protected static final int POP

Recovery action code, specifying that to recover from an error one needs to pop tokens from the stack.

See Also:

Constant Field Values

SCAN

protected static final int SCAN

Recovery action code specifying that one needs to keep scanning to recover.

See Also:

Constant Field Values

Constructor Detail

SyntaxError

public SyntaxError(int piErrorCode)

Constructor with the error code.

Parameters:

piErrorCode - type of syntax error

SyntaxError

public SyntaxError(int piErrorCode,
                   Token poFaultingToken)

Constructor with the error code and its cause.

Parameters:

piErrorCode - type of syntax error

poFaultingToken - the token that caused it

SyntaxError

public SyntaxError(Token poFaultingToken,
                   java.lang.String pstrCustomErrorMessage)

Constructor 2 - An Alterantive to Unknown Error.

Parameters:

poFaultingToken - the token that caused the error

pstrCustomErrorMessage - user-defined error message

SyntaxError

public SyntaxError(java.lang.String pstrEncodedCode)

Constructs a syntax error with the encoded code.

Parameters:

pstrEncodedCode - the string code.

SyntaxError

public SyntaxError()

Default constructor that merely calls super().

Since:

0.3.0.5

SyntaxError

public SyntaxError(java.lang.Exception poException)

Constructs SyntaxError with wrapped Exception object.

Parameters:

poException - the exception to wrap

Since:

0.3.0.5

SyntaxError

public SyntaxError(java.lang.String pstrMessage,
                   java.lang.Exception poException)

Constructs SyntaxError with wrapped Exception object and a custom error message.

Parameters:

pstrMessage - the custom error message

poException - the exception to wrap

Since:

0.3.0.5

Method Detail

setErrorCode

public void setErrorCode(java.lang.String pstrCode)

Sets error code given its string representation (as in token's lexeme).

Parameters:

pstrCode - the string code to convert to numeric

updateTokenInfo

public void updateTokenInfo(Token poFaultingToken)

Allows updating the state of an error, since the info might not be initially available (as in the TT, for example).

Parameters:

poFaultingToken - the faulting token that caused the error

setLineNo

public void setLineNo(int piLineNo)

Updates location.

Parameters:

piLineNo - the line number of the error

serialize

public boolean serialize(int piOperation,
                         java.io.FileWriter poFileWriter)

Serialization routine. TODO: migrate to MARF dump/restore mechanism.

Parameters:

piOperation - 0 for load (not implemented), 1 for save as text

poFileWriter - writer to write the error message to

Returns:

true if the operation was successful

isScanRecoveryAction

public boolean isScanRecoveryAction()

Checks whether the recovery action to follow this syntax error is to "keep scanning".

Returns:

true if the action is SCAN

See Also:

SCAN

isPopRecoveryAction

public boolean isPopRecoveryAction()

Checks whether the recovery action to follow this syntax error is to "pop last token from the stack".

Returns:

true if the action is POP

See Also:

POP

setScanRecoveryAction

public void setScanRecoveryAction()

Sets current error recovery action to SCAN.

See Also:

SCAN

setPopRecoveryAction

public void setPopRecoveryAction()

Sets current error recovery action to SCAN.

See Also:

POP

getMARFSourceCodeRevision

public static java.lang.String getMARFSourceCodeRevision()

Retrieves class' revision.

Returns:

revision string