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/** \file
* Contains default functions for creating and destroying as well as
* otherwise handling ANTLR3 standard exception structures.
*/
// [The "BSD licence"]
// Copyright (c) 2005-2009 Jim Idle, Temporal Wave LLC
// http://www.temporal-wave.com
// http://www.linkedin.com/in/jimidle
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. The name of the author may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <antlr3exception.h>
static void antlr3ExceptionPrint(pANTLR3_EXCEPTION ex);
static void antlr3ExceptionFree (pANTLR3_EXCEPTION ex);
/**
* \brief
* Creates a new ANTLR3 exception structure
*
* \param[in] exception
* One of the ANTLR3_xxx_EXCEPTION indicators such as #ANTLR3_RECOGNITION_EXCEPTION
*
* \param[in] message
* Pointer to message string
*
* \param[in] freeMessage
* Set to ANTLR3_TRUE if the message parameter should be freed by a call to
* ANTLR3_FREE() when the exception is destroyed.
*
* \returns
* Pointer to newly initialized exception structure, or an ANTLR3_ERR_xx defined value
* upon failure.
*
* An exception is 'thrown' by a recognizer when input is seen that is not predicted by
* the grammar productions or when some other error condition occurs. In C we do not have
* the luxury of try and catch blocks, so exceptions are added in the order they occur to
* a list in the baserecognizer structure. The last one to be thrown is inserted at the head of
* the list and the one currently installed is pointed to by the newly installed exception.
*
* \remarks
* After an exception is created, you may add a pointer to your own structure and a pointer
* to a function to free this structure when the exception is destroyed.
*
* \see
* ANTLR3_EXCEPTION
*/
pANTLR3_EXCEPTION
antlr3ExceptionNew(ANTLR3_UINT32 exception, void * name, void * message, ANTLR3_BOOLEAN freeMessage)
{
pANTLR3_EXCEPTION ex;
/* Allocate memory for the structure
*/
ex = (pANTLR3_EXCEPTION) ANTLR3_CALLOC(1, sizeof(ANTLR3_EXCEPTION));
/* Check for memory allocation
*/
if (ex == NULL)
{
return NULL;
}
ex->name = name; /* Install exception name */
ex->type = exception; /* Install the exception number */
ex->message = message; /* Install message string */
/* Indicate whether the string should be freed if exception is destroyed
*/
ex->freeMessage = freeMessage;
/* Install the API
*/
ex->print = antlr3ExceptionPrint;
ex->freeEx = antlr3ExceptionFree;
return ex;
}
/**
* \brief
* Prints out the message in all the exceptions in the supplied chain.
*
* \param[in] ex
* Pointer to the exception structure to print.
*
* \remarks
* You may wish to override this function by installing a pointer to a new function
* in the base recognizer context structure.
*
* \see
* ANTLR3_BASE_RECOGNIZER
*/
static void
antlr3ExceptionPrint(pANTLR3_EXCEPTION ex)
{
/* Ensure valid pointer
*/
while (ex != NULL)
{
/* Number if no message, else the message
*/
if (ex->message == NULL)
{
ANTLR3_FPRINTF(stderr, "ANTLR3_EXCEPTION number %d (%08X).\n", ex->type, ex->type);
}
else
{
ANTLR3_FPRINTF(stderr, "ANTLR3_EXCEPTION: %s\n", (char *)(ex->message));
}
/* Move to next in the chain (if any)
*/
ex = ex->nextException;
}
return;
}
/**
* \brief
* Frees up a chain of ANTLR3 exceptions
*
* \param[in] ex
* Pointer to the first exception in the chain to free.
*
* \see
* ANTLR3_EXCEPTION
*/
static void
antlr3ExceptionFree(pANTLR3_EXCEPTION ex)
{
pANTLR3_EXCEPTION next;
/* Ensure valid pointer
*/
while (ex != NULL)
{
/* Pick up anythign following now, before we free the
* current memory block.
*/
next = ex->nextException;
/* Free the message pointer if advised to
*/
if (ex->freeMessage == ANTLR3_TRUE)
{
ANTLR3_FREE(ex->message);
}
/* Call the programmer's custom free routine if advised to
*/
if (ex->freeCustom != NULL)
{
ex->freeCustom(ex->custom);
}
/* Free the actual structure itself
*/
ANTLR3_FREE(ex);
ex = next;
}
return;
}
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