For development, I handled tree grammar error reporting with the following
code. It simply searches back in the token stream until it hits an input
token and uses that for location information. I also print out the token
index offset between the error token and the reporting token so I get an
idea of where the error occurred. Note that I stopped changing this as soon
it was working enough to allow debugging the tree grammar so don't expect
much.
pANTLR3_COMMON_TOKEN searchToken = NULL;
unsigned int testIndex = 0;
if(ex->index > 0)
{
testIndex = ex->index - 1;
pANTLR3_BASE_TREE searchBaseTree =
thisTreeNodeStream->get(thisTreeNodeStream,testIndex);
searchToken = searchBaseTree->getToken(searchBaseTree);
//If UP token
if(errorToken->type == 3)
{
//Go back in the stream until we hit a token that is not UP and has a
column not -1
while(searchToken->type == 3 || searchToken->charPosition == -1)
{
testIndex--; //FIXME - Maybe dangerous?
searchBaseTree =
thisTreeNodeStream->get(thisTreeNodeStream,testIndex);
searchToken = searchBaseTree->getToken(searchBaseTree);
//printf("searchToken->toString
%s\n",searchToken->toString(searchToken)->chars);
}
}
//If DOWN token
else if(errorToken->type == 2)
{
//Go back in the stream until we hit a token that is not UP
while(searchToken->type == 2)
{
testIndex--; //FIXME - Maybe dangerous?
searchBaseTree =
thisTreeNodeStream->get(thisTreeNodeStream,testIndex);
searchToken = searchBaseTree->getToken(searchBaseTree);
// printf("searchToken->toString
%s\n",searchToken->toString(searchToken)->chars);
}
}
//If no column info(imaginary token?)
else if(errorToken->charPosition == -1)
{
//Go back in the stream until we hit a token that is not UP and has a
column not -1
while(searchToken->type == 3 || searchToken->type == 2 ||
searchToken->charPosition == -1)
{
testIndex--; //FIXME - Maybe dangerous?
searchBaseTree =
thisTreeNodeStream->get(thisTreeNodeStream,testIndex);
searchToken = searchBaseTree->getToken(searchBaseTree);
//printf("searchToken->user1 %d\n",searchToken->user1);
// printf("searchToken->type %d\n",searchToken->type);
// printf("searchToken->toString
%s\n",searchToken->toString(searchToken)->chars);
}
}
else
{
searchToken = errorToken;
}
}
//This must be the first node in the tree
else
{
searchToken = errorToken;
}
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