/**
* Shifts indices by 1 since the Twitter REST Api does not count them correctly for our language
* runtime.
*
* @param entities The entities that need to be adjusted
* @param indices The indices in the string where there are supplementary chars
*/
static void adjustEntitiesWithOffsets(
List<? extends FormattedUrlEntity> entities, List<Integer> indices) {
if (entities == null || indices == null) return;
for (FormattedUrlEntity entity : entities) {
// find all indices <= start and update offsets by that much
final int start = entity.start;
int offset = 0;
for (Integer index : indices) {
if (index - offset <= start) {
offset += 1;
} else {
break;
}
}
entity.start = entity.start + offset;
entity.end = entity.end + offset;
}
}
/**
* Since the unescaping of html causes for example & to turn into & we need to adjust the
* entity indices after that by 4 characters. This loops through the entities and adjusts them as
* necessary.
*
* @param entities The entities that need to be adjusted
* @param indices The indices of where there were escaped html chars that we unescaped
*/
static void adjustIndicesForEscapedChars(
List<? extends FormattedUrlEntity> entities, List<int[]> indices) {
if (entities == null || indices == null || indices.isEmpty()) {
return;
}
final int size = indices.size();
int m = 0; // marker
int diff = 0; // accumulated difference
int inDiff; // end difference for escapes in range
int len; // escaped length
int start; // escaped start
int end; // escaped end
int i; // reusable index
int[] index;
// For each of the entities, update the start and end indices
// Note: tweet entities are sorted.
for (FormattedUrlEntity entity : entities) {
inDiff = 0;
// Go through the escaped entities' indices
for (i = m; i < size; i++) {
index = indices.get(i);
start = index[0];
end = index[1];
// len is actually (end - start + 1) - 1
len = end - start;
if (end < entity.start) {
// bump position of the next marker
diff += len;
m++;
} else if (end < entity.end) {
inDiff += len;
}
}
// Once we've accumulated diffs, calc the offset
entity.start = entity.start - diff;
entity.end = entity.end - (diff + inDiff);
}
}
