/// Set the parent and child indexes for all children of the
/// supplied tree.
///
static void
freshenPACIndexesAll(pANTLR3_BASE_TREE tree)
{
tree->freshenPACIndexes(tree, 0);
}
/// Delete children from start to stop and replace with t even if t is
/// a list (nil-root tree). Num of children can increase or decrease.
/// For huge child lists, inserting children can force walking rest of
/// children to set their child index; could be slow.
///
static void
replaceChildren (pANTLR3_BASE_TREE parent, ANTLR3_INT32 startChildIndex, ANTLR3_INT32 stopChildIndex, pANTLR3_BASE_TREE newTree)
{
ANTLR3_INT32 replacingHowMany; // How many nodes will go away
ANTLR3_INT32 replacingWithHowMany; // How many nodes will replace them
ANTLR3_INT32 numNewChildren; // Tracking variable
ANTLR3_INT32 delta; // Difference in new vs existing count
ANTLR3_INT32 i;
ANTLR3_INT32 j;
pANTLR3_VECTOR newChildren; // Iterator for whatever we are going to add in
ANTLR3_BOOLEAN freeNewChildren; // Whether we created the iterator locally or reused it
if (parent->children == NULL)
{
ANTLR3_FPRINTF(stderr, "replaceChildren call: Indexes are invalid; no children in list for %s", parent->getText(parent)->chars);
return;
}
// Either use the existing list of children in the supplied nil node, or build a vector of the
// tree we were given if it is not a nil node, then we treat both situations exactly the same
//
if (newTree->isNilNode(newTree))
{
newChildren = newTree->children;
freeNewChildren = ANTLR3_FALSE; // We must NO free this memory
}
else
{
newChildren = antlr3VectorNew(1);
if (newChildren == NULL)
{
ANTLR3_FPRINTF(stderr, "replaceChildren: out of memory!!");
exit(1);
}
newChildren->add(newChildren, (void *)newTree, NULL);
freeNewChildren = ANTLR3_TRUE; // We must free this memory
}
// Initialize
//
replacingHowMany = stopChildIndex - startChildIndex + 1;
replacingWithHowMany = newChildren->size(newChildren);
delta = replacingHowMany - replacingWithHowMany;
numNewChildren = newChildren->size(newChildren);
// If it is the same number of nodes, then do a direct replacement
//
if (delta == 0)
{
pANTLR3_BASE_TREE child;
// Same number of nodes
//
j = 0;
for (i = startChildIndex; i <= stopChildIndex; i++)
{
child = (pANTLR3_BASE_TREE) newChildren->get(newChildren, j);
parent->children->set(parent->children, i, child, NULL, ANTLR3_FALSE);
child->setParent(child, parent);
child->setChildIndex(child, i);
}
}
else if (delta > 0)
{
ANTLR3_UINT32 indexToDelete;
// Less nodes than there were before
// reuse what we have then delete the rest
//
for (j = 0; j < numNewChildren; j++)
{
parent->children->set(parent->children, startChildIndex + j, newChildren->get(newChildren, j), NULL, ANTLR3_FALSE);
}
// We just delete the same index position until done
//
indexToDelete = startChildIndex + numNewChildren;
for (j = indexToDelete; j <= (ANTLR3_INT32)stopChildIndex; j++)
{
parent->children->remove(parent->children, indexToDelete);
}
parent->freshenPACIndexes(parent, startChildIndex);
}
else
{
ANTLR3_UINT32 numToInsert;
// More nodes than there were before
// Use what we can, then start adding
//
for (j = 0; j < replacingHowMany; j++)
{
parent->children->set(parent->children, startChildIndex + j, newChildren->get(newChildren, j), NULL, ANTLR3_FALSE);
}
numToInsert = replacingWithHowMany - replacingHowMany;
for (j = replacingHowMany; j < replacingWithHowMany; j++)
{
parent->children->add(parent->children, newChildren->get(newChildren, j), NULL);
}
parent->freshenPACIndexes(parent, startChildIndex);
}
if (freeNewChildren == ANTLR3_TRUE)
{
ANTLR3_FREE(newChildren->elements);
newChildren->elements = NULL;
newChildren->size = 0;
ANTLR3_FREE(newChildren); // Will not free the nodes
}
}
