Method DisplayErrorLocation

common/source.cc:514–553

}

std::string Source::DisplayErrorLocation(SourceLocation location) const {
  constexpr char32_t kDot = '.';
  constexpr char32_t kHat = '^';

  constexpr char32_t kWideDot = 0xff0e;
  constexpr char32_t kWideHat = 0xff3e;
  absl::optional<std::string> snippet = Snippet(location.line);
  if (!snippet || snippet->empty()) {
    return "";
  }

  *snippet = absl::StrReplaceAll(*snippet, {{"\t", " "}});
  absl::string_view snippet_view(*snippet);
  std::string result;
  absl::StrAppend(&result, "\n | ", *snippet);
  absl::StrAppend(&result, "\n | ");

  std::string index_line;
  for (int32_t i = 0; i < location.column && !snippet_view.empty(); ++i) {
    size_t count;
    std::tie(std::ignore, count) = internal::Utf8Decode(snippet_view);
    snippet_view.remove_prefix(count);
    if (count > 1) {
      internal::Utf8Encode(index_line, kWideDot);
    } else {
      internal::Utf8Encode(index_line, kDot);
    }
  }
  size_t count = 0;
  if (!snippet_view.empty()) {
    std::tie(std::ignore, count) = internal::Utf8Decode(snippet_view);
  }
  if (count > 1) {
    internal::Utf8Encode(index_line, kWideHat);
  } else {
    internal::Utf8Encode(index_line, kHat);
  }
  absl::StrAppend(&result, index_line);
  return result;
}

absl::optional<SourcePosition> Source::FindLinePosition(int32_t line) const {
  if (ABSL_PREDICT_FALSE(line < 1)) {