/**
* Returns atomic text node merging operations if necessary for the given node PRE and its right
* neighbor PRE+1.
*
* @param a node PRE value
* @param d target data reference
* @return list of text merging operations
*/
private AtomicUpdateList necessaryMerges(final int a, final Data d) {
final AtomicUpdateList mergeTwoNodes = new AtomicUpdateList(d);
final int s = d.meta.size;
final int b = a + 1;
// don't leave table
if (a >= s || b >= s || a < 0 || b < 0) return mergeTwoNodes;
// only merge texts
if (d.kind(a) != Data.TEXT || d.kind(b) != Data.TEXT) return mergeTwoNodes;
// only merge neighboring texts
if (d.parent(a, Data.TEXT) != d.parent(b, Data.TEXT)) return mergeTwoNodes;
mergeTwoNodes.addDelete(b);
mergeTwoNodes.addUpdateValue(a, Data.TEXT, Token.concat(d.text(a, true), d.text(b, true)));
return mergeTwoNodes;
}
