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Move fix_entity_offsets to a separate function.

This commit is contained in:
levlam 2021-07-28 06:48:52 +03:00
parent 389e92f1f4
commit bdbf4db9ff
1 changed files with 46 additions and 41 deletions
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87
td/telegram/MessageEntity.cpp
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@ -1461,6 +1461,51 @@ static void remove_entities_intersecting_blockquote(vector<MessageEntity> &entit
entities.erase(entities.begin() + left_entities, entities.end());
}
// keeps only non-intersecting entities
// fixes entity offsets from UTF-8 to UTF-16 offsets
static void fix_entity_offsets(Slice text, vector<MessageEntity> &entities) {
if (entities.empty()) {
return;
}
sort_entities(entities);
remove_intersecting_entities(entities);
const unsigned char *begin = text.ubegin();
const unsigned char *ptr = begin;
const unsigned char *end = text.uend();
int32 utf16_pos = 0;
for (auto &entity : entities) {
int cnt = 2;
auto entity_begin = entity.offset;
auto entity_end = entity.offset + entity.length;
int32 pos = static_cast<int32>(ptr - begin);
if (entity_begin == pos) {
cnt--;
entity.offset = utf16_pos;
}
while (ptr != end && cnt > 0) {
unsigned char c = ptr[0];
utf16_pos += 1 + (c >= 0xf0);
ptr = next_utf8_unsafe(ptr, nullptr, "fix_entity_offsets");
pos = static_cast<int32>(ptr - begin);
if (entity_begin == pos) {
cnt--;
entity.offset = utf16_pos;
} else if (entity_end == pos) {
cnt--;
entity.length = utf16_pos - entity.offset;
}
}
CHECK(cnt == 0);
}
}
vector<MessageEntity> find_entities(Slice text, bool skip_bot_commands) {
vector<MessageEntity> entities;
@ -1490,47 +1535,7 @@ vector<MessageEntity> find_entities(Slice text, bool skip_bot_commands) {
entities.emplace_back(type, offset, length);
}
if (entities.empty()) {
return entities;
}
sort_entities(entities);
remove_intersecting_entities(entities);
// fix offsets to UTF-16 offsets
const unsigned char *begin = text.ubegin();
const unsigned char *ptr = begin;
const unsigned char *end = text.uend();
int32 utf16_pos = 0;
for (auto &entity : entities) {
int cnt = 2;
auto entity_begin = entity.offset;
auto entity_end = entity.offset + entity.length;
int32 pos = static_cast<int32>(ptr - begin);
if (entity_begin == pos) {
cnt--;
entity.offset = utf16_pos;
}
while (ptr != end && cnt > 0) {
unsigned char c = ptr[0];
utf16_pos += 1 + (c >= 0xf0);
ptr = next_utf8_unsafe(ptr, nullptr, "find_entities");
pos = static_cast<int32>(ptr - begin);
if (entity_begin == pos) {
cnt--;
entity.offset = utf16_pos;
} else if (entity_end == pos) {
cnt--;
entity.length = utf16_pos - entity.offset;
}
}
CHECK(cnt == 0);
}
fix_entity_offsets(text, entities);
return entities;
}