.clang-format

# -*- yaml -*-

# This file determines clang-format's style settings; for details, refer to
# http://clang.llvm.org/docs/ClangFormatStyleOptions.html

BasedOnStyle:  Google
IndentWidth: 4

Language: Cpp

# Force pointers to the type for C++.
DerivePointerAlignment: false
PointerAlignment: Left

# Compress functions onto a single line (when they fit) iff they are defined
# inline (inside a of class) or are empty.
AllowShortFunctionsOnASingleLine: Inline

# Compress lambdas onto a single line iff they are empty.
AllowShortLambdasOnASingleLine: Empty

# Specify the #include statement order.  This implements the order mandated by
# the Google C++ Style Guide: related header, C headers, C++ headers, library
# headers, and finally the project headers.
#
# To obtain updated lists of system headers used in the below expressions, see:
# http://stackoverflow.com/questions/2027991/list-of-standard-header-files-in-c-and-c/2029106#2029106.
IncludeCategories:
  # Spacers used by drake/tools/formatter.py.
  - Regex:    '^<clang-format-priority-15>$'
    Priority: 15
  - Regex:    '^<clang-format-priority-25>$'
    Priority: 25
  - Regex:    '^<clang-format-priority-35>$'
    Priority: 35
  - Regex:    '^<clang-format-priority-45>$'
    Priority: 45
  # C system headers.  The header_dependency_test.py contains a copy of this
  # list; be sure to update that test anytime this list changes.
  - Regex:    '^[<"](aio|arpa/inet|assert|complex|cpio|ctype|curses|dirent|dlfcn|errno|fcntl|fenv|float|fmtmsg|fnmatch|ftw|glob|grp|iconv|inttypes|iso646|langinfo|libgen|limits|locale|math|monetary|mqueue|ndbm|netdb|net/if|netinet/in|netinet/tcp|nl_types|poll|pthread|pwd|regex|sched|search|semaphore|setjmp|signal|spawn|stdalign|stdarg|stdatomic|stdbool|stddef|stdint|stdio|stdlib|stdnoreturn|string|strings|stropts|sys/ipc|syslog|sys/mman|sys/msg|sys/resource|sys/select|sys/sem|sys/shm|sys/socket|sys/stat|sys/statvfs|sys/time|sys/times|sys/types|sys/uio|sys/un|sys/utsname|sys/wait|tar|term|termios|tgmath|threads|time|trace|uchar|ulimit|uncntrl|unistd|utime|utmpx|wchar|wctype|wordexp)\.h[">]$'
    Priority: 20
  # C++ system headers (as of C++23).  The header_dependency_test.py contains a
  # copy of this list; be sure to update that test anytime this list changes.
  - Regex:    '^[<"](algorithm|any|array|atomic|barrier|bit|bitset|cassert|ccomplex|cctype|cerrno|cfenv|cfloat|charconv|chrono|cinttypes|ciso646|climits|clocale|cmath|codecvt|compare|complex|concepts|condition_variable|coroutine|csetjmp|csignal|cstdalign|cstdarg|cstdbool|cstddef|cstdint|cstdio|cstdlib|cstring|ctgmath|ctime|cuchar|cwchar|cwctype|deque|exception|execution|expected|filesystem|flat_map|flat_set|format|forward_list|fstream|functional|future|generator|initializer_list|iomanip|ios|iosfwd|iostream|istream|iterator|latch|limits|list|locale|map|mdspan|memory|memory_resource|mutex|new|numbers|numeric|optional|ostream|print|queue|random|ranges|ratio|regex|scoped_allocator|semaphore|set|shared_mutex|source_location|span|spanstream|sstream|stack|stacktrace|stdexcept|stdfloat|stop_token|streambuf|string|string_view|strstream|syncstream|system_error|thread|tuple|type_traits|typeindex|typeinfo|unordered_map|unordered_set|utility|valarray|variant|vector|version)[">]$'
    Priority: 30
  # Other libraries' h files (with angles).
  - Regex:    '^<'
    Priority: 40
  # Your project's h files.
  - Regex:    '^"drake'
    Priority: 50
  # Other libraries' h files (with quotes).
  - Regex:    '^"'
    Priority: 40