Method WithPostcodes

libs/search/geocoder.cpp:1114–1185

template <typename Fn>
void Geocoder::WithPostcodes(BaseContext & ctx, Fn && fn)
{
  TRACE(WithPostcodes);

  size_t const maxPostcodeTokens = GetMaxNumTokensInPostcode();
  auto worldContext = GetWorldContext(m_dataSource);

  size_t const numTokens = ctx.NumTokens();
  for (size_t startToken = 0; startToken != numTokens; ++startToken)
  {
    size_t endToken = startToken;
    for (size_t n = 1; startToken + n <= numTokens && n <= maxPostcodeTokens; ++n)
    {
      if (ctx.IsTokenUsed(startToken + n - 1))
        break;

      TokenSlice slice(m_params, TokenRange(startToken, startToken + n));
      auto const isPrefix = startToken + n == numTokens;
      if (LooksLikePostcode(QuerySlice(slice), isPrefix))
        endToken = startToken + n;
    }
    if (startToken == endToken)
      continue;

    TokenRange const tokenRange(startToken, endToken);

    // Find features by exact postcode match from OSM data.
    auto postcodes = RetrievePostcodeFeatures(*m_context, TokenSlice(m_params, tokenRange));

    // Get _around postcode_ features from additional _external postcodes_ section.
    // Do not emit _around postcode_ only features if we don't have some other tokens to match (avoid lags).
    if (tokenRange.Size() < numTokens && m_context->m_value.m_cont.IsExist(POSTCODE_POINTS_FILE_TAG))
    {
      auto & postcodePoints = m_postcodePointsCache.Get(*m_context);
      UniString postcodeQuery;
      JoinQueryTokens(m_params, tokenRange, UniString::kSpace /* sep */, postcodeQuery);
      vector<m2::PointD> points;
      postcodePoints.Get(postcodeQuery, points);

      // PostcodePoints::Get returns many points for "BN1" or one point for "BN1 3LJ".
      // Do aggregate rects for a _wide_ postcode prefix match.
      m2::RectD rect;
      for (auto const & p : points)
        rect.Add(mercator::RectByCenterXYAndOffset(p, postcodePoints.GetRadius()));

      postcodes = postcodes.Union(RetrieveGeometryFeatures(*m_context, rect, RectId::Postcode));
    }

    SCOPE_GUARD(cleanup, [&]() { m_postcodes.Clear(); });

    if (!postcodes.IsEmpty())
    {
      ScopedMarkTokens mark(ctx.m_tokens, BaseContext::TOKEN_TYPE_POSTCODE, tokenRange);

      m_postcodes.Clear();

      if (worldContext)
        m_postcodes.m_worldFeatures = RetrievePostcodeFeatures(*worldContext, TokenSlice(m_params, tokenRange));