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[C] Add support for decimal floating-point types
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This was introduced in C23 and adds support for the new type
keywords, the new suffixes for the new types, and the new
length modifiers for printf and scanf.

Furthermore, the existing matching rules for floats was changed
to remove the possibility of '1f' being classified as a floating
point literal. This is actually considered to be an integral
literal with an invalid suffix instead of a floating point literal
by all compilers that I know of and such produces compiler errors
if such code is compiled.
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James Buren committed Nov 9, 2024
1 parent 36ca6c6 commit 0054f20
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Showing 2 changed files with 24 additions and 20 deletions.
32 changes: 14 additions & 18 deletions C++/C.sublime-syntax
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Original file line number Diff line number Diff line change
Expand Up @@ -31,14 +31,13 @@ variables:
oct_suffix: '[8-9g-zG-Z_][[:alnum:]_]*'
dec_suffix: '[a-zA-Z_][[:alnum:]_]*'
hex_suffix: '[g-zG-Z_][[:alnum:]_]*'
double_suffix: '[fFlL]'
float_suffix: '[fF]'
double_suffix: 'df|DF|dd|DD|dl|DL|[fFlL]'
integer_suffix: 'u?wb|[lL]{1,2}[uU]?|[uU][lL]{0,2}'

identifier: \b[[:alpha:]_][[:alnum:]_]*\b # upper and lowercase
macro_identifier: \b[[:upper:]_][[:upper:][:digit:]_]{2,}\b # only uppercase, at least 3 chars
control_keywords: 'break|case|continue|default|do|else|for|goto|if|_Pragma|return|switch|while'
basic_types: 'asm|__asm__|auto|bool|_Bool|char|_Complex|double|float|_Imaginary|int|long|short|signed|unsigned|void'
basic_types: 'asm|__asm__|auto|bool|_Bool|char|_Complex|double|float|_Imaginary|_Decimal(32|64|128)|int|long|short|signed|unsigned|void'
before_tag: 'struct|union|enum'
microsoft_types: '__int8|__int16|__int32|__int64'
windows_types: 'APIENTRY|ATOM|BOOL|BOOLEAN|BYTE|CALLBACK|CCHAR|CHAR|COLORREF|CONST|DWORD|DWORDLONG|DWORD_PTR|DWORD32|DWORD64|FLOAT|HACCEL|HALF_PTR|HANDLE|HBITMAP|HBRUSH|HCOLORSPACE|HCONV|HCONVLIST|HCURSOR|HDC|HDDEDATA|HDESK|HDROP|HDWP|HENHMETAFILE|HFILE|HFONT|HGDIOBJ|HGLOBAL|HHOOK|HICON|HINSTANCE|HKEY|HKL|HLOCAL|HMENU|HMETAFILE|HMODULE|HMONITOR|HPALETTE|HPEN|HRESULT|HRGN|HRSRC|HSZ|HWINSTA|HWND|INT|INT_PTR|INT8|INT16|INT32|INT64|LANGID|LCID|LCTYPE|LGRPID|LONG|LONGLONG|LONG_PTR|LONG32|LONG64|LPARAM|LPBOOL|LPBYTE|LPCOLORREF|LPCSTR|LPCTSTR|LPCVOID|LPCWSTR|LPDWORD|LPHANDLE|LPINT|LPLONG|LPSTR|LPTSTR|LPVOID|LPWORD|LPWSTR|LRESULT|PBOOL|PBOOLEAN|PBYTE|PCHAR|PCSTR|PCTSTR|PCWSTR|PDWORD|PDWORDLONG|PDWORD_PTR|PDWORD32|PDWORD64|PFLOAT|PHALF_PTR|PHANDLE|PHKEY|PINT|PINT_PTR|PINT8|PINT16|PINT32|PINT64|PLCID|PLONG|PLONGLONG|PLONG_PTR|PLONG32|PLONG64|POINTER_32|POINTER_64|POINTER_SIGNED|POINTER_UNSIGNED|PSHORT|PSIZE_T|PSSIZE_T|PSTR|PTBYTE|PTCHAR|PTSTR|PUCHAR|PUHALF_PTR|PUINT|PUINT_PTR|PUINT8|PUINT16|PUINT32|PUINT64|PULONG|PULONGLONG|PULONG_PTR|PULONG32|PULONG64|PUSHORT|PVOID|PWCHAR|PWORD|PWSTR|QWORD|SC_HANDLE|SC_LOCK|SERVICE_STATUS_HANDLE|SHORT|SIZE_T|SSIZE_T|TBYTE|TCHAR|UCHAR|UHALF_PTR|UINT|UINT_PTR|UINT8|UINT16|UINT32|UINT64|ULONG|ULONGLONG|ULONG_PTR|ULONG32|ULONG64|UNICODE_STRING|USHORT|USN|VOID|WCHAR|WINAPI|WORD|WPARAM'
Expand Down Expand Up @@ -181,13 +180,13 @@ contexts:
string_placeholder:
- match: |-
(?x)%
(\d+\$)? # field (argument #)
[#0\- +']* # flags
[,;:_]? # separator character (AltiVec)
((-?\d+)|\*(-?\d+\$)?)? # minimum field width
(\.((-?\d+)|\*(-?\d+\$)?)?)? # precision
(hh|h|ll|l|j|t|z|q|L|vh|vl|v|hv|hl|wf?[0-9]+)? # length modifier
(\[[^\]]+\]|[am]s|[diouxXbDOUeEfFgGaACcSspn%]) # conversion type
(\d+\$)? # field (argument #)
[#0\- +']* # flags
[,;:_]? # separator character (AltiVec)
((-?\d+)|\*(-?\d+\$)?)? # minimum field width
(\.((-?\d+)|\*(-?\d+\$)?)?)? # precision
(hh|h|ll|l|j|t|z|q|L|H|D|DD|vh|vl|v|hv|hl|wf?[0-9]+)? # length modifier
(\[[^\]]+\]|[am]s|[diouxXbDOUeEfFgGaACcSspn%]) # conversion type
scope: constant.other.placeholder.c
keywords:
Expand Down Expand Up @@ -294,8 +293,6 @@ contexts:
# 1e1 1e1f 1e1L
| {{dec_exponent}}
) ({{double_suffix}})?
# 1f
| ({{float_suffix}})
) ({{dec_suffix}})?
# .1, .1e1, .1e-1, .1f, .1e1f, .1e-1f, .1L, .1e1L, .1e-1L
| ( (\.) {{dec_digit}}+ {{dec_exponent}}? ) (?: ({{double_suffix}}) | ({{dec_suffix}}) )?
Expand All @@ -306,12 +303,11 @@ contexts:
2: constant.numeric.value.c
3: punctuation.separator.decimal.c
4: constant.numeric.suffix.c
5: constant.numeric.suffix.c
6: invalid.illegal.numeric.suffix.c
7: constant.numeric.value.c
8: punctuation.separator.decimal.c
9: constant.numeric.suffix.c
10: invalid.illegal.numeric.suffix.c
5: invalid.illegal.numeric.suffix.c
6: constant.numeric.value.c
7: punctuation.separator.decimal.c
8: constant.numeric.suffix.c
9: invalid.illegal.numeric.suffix.c
# hexadecimal float (C99)
- match: \b(0[xX])({{hex_digit}}*(\.){{hex_digit}}*{{hex_exponent}})(?:([fFlL]\b)|({{dec_suffix}}))?
Expand Down
12 changes: 10 additions & 2 deletions C++/syntax_test_c.c
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Original file line number Diff line number Diff line change
Expand Up @@ -327,6 +327,15 @@ bool still_C_code_here = true;
/* <- storage.type */
/* ^ constant.language */

_Decimal32 d32;
/* <- storage.type */

_Decimal64 d64;
/* <- storage.type */

_Decimal128 d128;
/* <- storage.type */

atomic_bool atomic_bool_var;
/* <- support.type.stdatomic */

Expand Down Expand Up @@ -1034,9 +1043,8 @@ dec1 = 1234567890;
/* ^ punctuation.terminator - constant */

dec2 = 1234567890f;
/* ^^^^^^^^^^^ meta.number.float.decimal.c */
/* ^^^^^^^^^^ constant.numeric.value.c */
/* ^ constant.numeric.suffix.c */
/* ^ invalid.illegal.numeric.suffix.c */
/* ^ punctuation.terminator - constant */

dec3 = 1234567890L;
Expand Down

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