Function FormatError

src/error-formatter.cc:23–81

namespace {

std::string FormatError(const Error& error,
                        Location::Type location_type,
                        const Color& color,
                        LexerSourceLineFinder* line_finder,
                        int source_line_max_length,
                        int indent) {
  std::string indent_str(indent, ' ');
  std::string result = indent_str;

  result += color.MaybeBoldCode();

  const Location& loc = error.loc;
  if (!error.filename.empty()) {
    result += error.filename;
    result += ":";
  }

  if (location_type == Location::Type::Text) {
    result += StringPrintf("%u:%u: ", loc.line, loc.first_column);
  } else if (loc.offset != kInvalidOffset) {
    result += StringPrintf("%07" PRIzx ": ", loc.offset);
  }

  result += color.MaybeRedCode();
  result += GetErrorLevelName(error.error_level);
  result += ": ";
  result += color.MaybeDefaultCode();

  result += error.message;
  result += '\n';

  LexerSourceLineFinder::SourceLine source_line;
  if (line_finder) {
    line_finder->GetSourceLine(loc, source_line_max_length, &source_line);
  }

  if (!source_line.line.empty()) {
    result += indent_str;
    result += source_line.line;
    result += '\n';
    result += indent_str;

    size_t num_spaces = 0;
    if (loc.first_column > source_line.column_offset) {
      num_spaces = (loc.first_column - 1) - source_line.column_offset;
    }
    size_t num_carets = loc.last_column - loc.first_column;
    num_carets = std::min(num_carets, source_line.line.size() - num_spaces);
    num_carets = std::max<size_t>(num_carets, 1);
    result.append(num_spaces, ' ');
    result += color.MaybeBoldCode();
    result += color.MaybeGreenCode();
    result.append(num_carets, '^');
    result += color.MaybeDefaultCode();
    result += '\n';
  }

  return result;