require c-comment
require c-uchar

syntax .c-esc

state start special
    char "abfnrtv'\\\"" END special
    char 0-3 oct1
    char 4-7 oct2
    char x hex0
    char u .c-uchar4:END special
    char U .c-uchar8:END special
    # Anything but \n
    char -n "\n" END error
    # Don't eat \n
    noeat END

state oct1 special
    char 0-7 oct2
    noeat END

state oct2 special
    char 0-7 END special
    noeat END

state hex0 special
    char 0-9a-fA-F hex1
    noeat END

state hex1 special
    char 0-9a-fA-F hex2
    noeat END

# In strings "\xaff" is an error but "\xafg" is not.
# In chars both are errors.
state hex2 special
    char 0-9a-fA-F END error
    noeat END

syntax .c-string

state string
    char '"' END string
    # Avoid highlighting rest of the file again
    char "\n" END error
    char "\\" .c-esc:this
    eat this

syntax .c-char

state char
    char "'\n" END error
    char \\ .c-esc:char-end
    eat char-end

state char-end char
    char "'" END char
    eat END error

syntax .cpp-comment

state comment
    char "\n" END
    char \\ backslash
    eat this

state backslash comment
    # Multi-line comment?
    char "\n" comment
    noeat comment

syntax c

state start code
    char " \t" this
    char # preproc
    char -b a-z_ ident-label
    char -b A-Z ident-upper-label
    noeat c

state preproc
    char " \t" this
    char -b a-zA-Z_ preproc-ident
    noeat preproc-misc

state preproc-ident preproc
    char -b a-zA-Z0-9_ this
    bufis 'include' preproc-include
    inlist preproccond preproccond
    noeat preproc-misc

state preproccond
    # Recolor to start of the line
    recolor preproccond 100
    noeat preproc-misc

state preproc-misc preproc
    char "\n" start
    char "\\" preproc-cont
    char \" .c-string:this
    char \' .c-char:this
    str '/*' .c-comment:this
    str '//' .cpp-comment:start
    eat this

state preproc-include preproc
    char " \t" this
    char "\n" start
    char "\\" preproc-cont
    char '"' local-include
    char '<' system-include
    # Not an error: #include DEFINE
    noeat preproc-misc

state preproc-cont preproc
    char "\n" preproc-misc
    noeat preproc-misc

state local-include string
    char '"' end-include string
    char "\n" start
    eat this

state system-include string
    char '>' end-include string
    char "\n" start
    eat this

state end-include preproc
    char "\n" start
    char " \t" this
    str '/*' .c-comment:this
    str '//' .cpp-comment:start
    eat preproc-error

state preproc-error error
    char "\n" start
    eat this

state c code
    char -b a-z_ ident
    char -b A-Z ident-upper
    char 0 zero
    char 1-9 dec
    char . dot
    char \" .c-string:this
    char \' .c-char:this
    char "\n" start
    char ';' semicolon
    str '/*' .c-comment:this
    str '//' .cpp-comment:start
    eat this

state semicolon code
    char " \t" this
    char -b a-zA-Z_ ident-label
    noeat c

state ident-label ident
    char -b a-zA-Z0-9_ this
    char -b : label
    noeat -b ident

state label
    recolor label
    noeat c

state ident
    char -b a-zA-Z0-9_ this
    inlist keyword c
    inlist c11-keyword c
    inlist type c
    inlist common-typedef c
    inlist posix-type c
    inlist constant c
    inlist cpp-keyword c
    noeat c

state ident-upper ident
    char -b a-z class-name
    char -b A-Z0-9_ ident
    noeat c

state class-name
    recolor class-name
    char a-zA-Z0-9_ this
    noeat c

state ident-upper-label ident
    char -b a-z class-name-label
    char -b A-Z0-9_ ident-label
    char -b : label
    noeat c

state class-name-label class-name
    char -b a-zA-Z0-9_ this
    char -b : label
    noeat -b class-name

state zero numeric
    char xX hex
    char 0-7 oct
    char . float
    noeat check-suffix

state oct numeric
    char 0-7 this
    noeat check-suffix

state dec numeric
    char 0-9 this
    char eE exp
    char . float
    noeat check-suffix

state hex numeric
    char 0-9a-fA-F this
    noeat check-suffix

state check-suffix error
    char -b a-zA-Z0-9_ this
    inlist numeric-suffix c numeric
    noeat c

state dot numeric
    char 0-9 float
    recolor code 1
    noeat c

state float numeric
    char 0-9 this
    char eE exp
    char fFlL float-suffix
    char a-zA-Z0-9_ error-ident
    noeat c

state float-suffix numeric
    char a-zA-Z0-9_ error-ident
    noeat c

state exp numeric
    char +- exp-digit
    char 0-9 exp-digit
    char a-zA-Z0-9_ error-ident
    noeat c

state exp-digit numeric
    char 0-9 this
    char a-zA-Z0-9_ error-ident
    noeat c

state error-ident error
    char a-zA-Z0-9_ this
    noeat c

list keyword \
    if else for while do continue switch case break default return goto \
    asm const static inline register extern volatile auto restrict sizeof \
    typedef

list c11-keyword \
    _Alignas _Alignof _Noreturn \
    alignas alignof noreturn

list type \
    char short int long float double void signed unsigned enum struct union \
    bool size_t va_list jmp_buf FILE _Bool _Complex _Imaginary \
    clock_t div_t double_t fenv_t fexcept_t float_t fpos_t imaxdiv_t ldiv_t \
    lldiv_t mbstate_t ptrdiff_t sig_atomic_t time_t wchar_t wctrans_t wint_t \
    int8_t uint8_t int_fast8_t uint_fast8_t int_least8_t uint_least8_t \
    int16_t uint16_t int_fast16_t uint_fast16_t int_least16_t uint_least16_t \
    int32_t uint32_t int_fast32_t uint_fast32_t int_least32_t uint_least32_t \
    int64_t uint64_t int_fast64_t uint_fast64_t int_least64_t uint_least64_t \
    intptr_t uintptr_t intmax_t uintmax_t __int128 char32_t char16_t char8_t

list common-typedef \
    u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 s8 s16 s32 s64 s128 \
    uchar ushort uint ulong ullong u_char u_short u_int u_long u_llong

list posix-type \
    blkcnt_t blksize_t clockid_t dev_t DIR fsblkcnt_t fsfilcnt_t gid_t glob_t \
    id_t ino_t key_t locale_t mode_t nlink_t off_t pid_t regex_t regmatch_t \
    regoff_t siginfo_t sigjmp_buf sigset_t ssize_t suseconds_t timer_t uid_t \
    trace_attr_t trace_event_id_t trace_event_set_t trace_id_t \
    pthread_t pthread_attr_t pthread_barrier_t pthread_barrierattr_t \
    pthread_cond_t pthread_condattr_t pthread_key_t pthread_mutex_t \
    pthread_mutexattr_t pthread_once_t pthread_rwlock_t \
    pthread_rwlockattr_t pthread_spinlock_t

list constant \
    NULL stdin stdout stderr false true \
    E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT EAGAIN EALREADY \
    EBADF EBADMSG EBUSY ECANCELED ECHILD ECONNABORTED ECONNREFUSED \
    ECONNRESET EDEADLK EDESTADDRREQ EDOM EDQUOT EEXIST EFAULT EFBIG \
    EHOSTUNREACH EIDRM EILSEQ EINPROGRESS EINTR EINVAL EIO EISCONN \
    EISDIR ELOOP EMFILE EMLINK EMSGSIZE EMULTIHOP ENAMETOOLONG ENETDOWN \
    ENETRESET ENETUNREACH ENFILE ENOBUFS ENODATA ENODEV ENOENT ENOEXEC \
    ENOLCK ENOLINK ENOMEM ENOMSG ENOPROTOOPT ENOSPC ENOSR ENOSTR ENOSYS \
    ENOTCONN ENOTDIR ENOTEMPTY ENOTRECOVERABLE ENOTSOCK ENOTSUP ENOTTY \
    ENXIO EOPNOTSUPP EOVERFLOW EOWNERDEAD EPERM EPIPE EPROTO \
    EPROTONOSUPPORT EPROTOTYPE ERANGE EROFS ESPIPE ESRCH ESTALE ETIME \
    ETIMEDOUT ETXTBSY EWOULDBLOCK EXDEV ENOTBLK

list preproccond \
    elif else endif if ifdef ifndef

list -i numeric-suffix \
    ULL UL U LLU LU LL L

list cpp-keyword \
    and and_eq bitand bitor catch class compl const_cast concept \
    consteval constexpr constinit const_cast \
    co_await co_return co_yield \
    decltype delete dynamic_cast explicit export friend \
    mutable namespace new noexcept not not_eq nullptr \
    operator or or_eq \
    private protected public \
    reinterpret_cast requires static_cast template this throw try \
    typeid typename using virtual xor xor_eq

default ident class-name
default keyword c11-keyword cpp-keyword
default preproc preproccond
default type posix-type