std::string Format(std::string qualifier, const SourceLocation& location,
StringView message, size_t squiggle_size = 0u) {
SourceFile::Position position;
std::string surrounding_line = location.SourceLine(&position);
std::string squiggle = MakeSquiggle(surrounding_line, position.column);
if (squiggle_size != 0u) {
--squiggle_size;
}
squiggle += std::string(squiggle_size, '~');
// Some tokens (like string literals) can span multiple
// lines. Truncate the string to just one line at most. The
// containing line contains a newline, so drop it when
// comparing sizes.
size_t line_size = surrounding_line.size() - 1;
if (squiggle.size() > line_size) {
squiggle.resize(line_size);
}
// Many editors and IDEs recognize errors in the form of
// filename:linenumber:column: error: descriptive-test-here\n
std::string error = location.position();
error.append(": ");
error.append(qualifier);
error.append(": ");
error.append(message);
error.push_back('\n');
error.append(surrounding_line);
error.append(squiggle);
return error;
}
