73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
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/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "lang/lang_text_entity.h"
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#include "lang/lang_tag.h"
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namespace Lang {
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TextWithEntities ReplaceTag<TextWithEntities>::Call(TextWithEntities &&original, ushort tag, const TextWithEntities &replacement) {
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auto replacementPosition = FindTagReplacementPosition(original.text, tag);
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if (replacementPosition < 0) {
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return std::move(original);
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}
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auto result = TextWithEntities();
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result.text = ReplaceTag<QString>::Replace(std::move(original.text), replacement.text, replacementPosition);
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auto originalEntitiesCount = original.entities.size();
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auto replacementEntitiesCount = replacement.entities.size();
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if (originalEntitiesCount != 0 || replacementEntitiesCount != 0) {
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result.entities.reserve(originalEntitiesCount + replacementEntitiesCount);
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auto replacementEnd = replacementPosition + replacement.text.size();
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auto replacementEntity = replacement.entities.cbegin();
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auto addReplacementEntitiesUntil = [&replacementEntity, &replacement, &result, replacementPosition, replacementEnd](int untilPosition) {
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while (replacementEntity != replacement.entities.cend()) {
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auto newOffset = replacementPosition + replacementEntity->offset();
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if (newOffset >= untilPosition) {
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return;
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}
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auto newEnd = newOffset + replacementEntity->length();
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newOffset = std::clamp(newOffset, replacementPosition, replacementEnd);
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newEnd = std::clamp(newEnd, replacementPosition, replacementEnd);
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if (auto newLength = newEnd - newOffset) {
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result.entities.push_back({ replacementEntity->type(), newOffset, newLength, replacementEntity->data() });
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}
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++replacementEntity;
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}
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};
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for (const auto &entity : std::as_const(original.entities)) {
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// Transform the entity by the replacement.
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auto offset = entity.offset();
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auto end = offset + entity.length();
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if (offset > replacementPosition) {
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offset = offset + replacement.text.size() - kTagReplacementSize;
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}
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if (end > replacementPosition) {
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end = end + replacement.text.size() - kTagReplacementSize;
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}
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offset = std::clamp(offset, 0, result.text.size());
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end = std::clamp(end, 0, result.text.size());
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// Add all replacement entities that start before the current original entity.
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addReplacementEntitiesUntil(offset);
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// Add a modified original entity.
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if (auto length = end - offset) {
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result.entities.push_back({ entity.type(), offset, length, entity.data() });
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}
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}
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// Add the remaining replacement entities.
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addReplacementEntitiesUntil(result.text.size());
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}
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return result;
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}
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} // namespace Lang
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