add syntax for C99 style comments when language mode is C

[efa]

// C99 comments (single line) are not italics like happen for C89 comments (multi line)

[efa]

in the past a Nedit's maillist subscriber sent me some steps to add C99 comments recognition by menu Prefences, Default Settings, Syntax Highlighting but I cannot find that anymore, maybe lost on an old work computer installation and I cannot find the email too

[unixwork]

Preferences -> Default Settings -> Syntax Highlighting -> Recognition Patterns

Language Mode: C New Pattern

Pattern Type: Pass 2 Highlight Style: Comment Pattern Name: commentc99 Starting Regular Expression: // Ending Regular Expression: (?<!\)$

I will add this to the next release. Can't do it yet, because I want to add some other syntax highlighting changes and want to do all in one go, because I need to create a patch for existing nedit.rc files and increment nedit.fileVersion. It is better to do this at the end before the release.

[efa]

there is the other related request: https://github.com/unixwork/xnedit/issues/21 for bool and other new (really old in 2021) keywords

[efa]

you probably mean: Ending Regular Expression: \(?<!\)$ instead of Ending Regular Expression: (?<!\)$

[efa]

and maybe need something similar for comments on preprocessor lines

[unixwork]

Actually (?<!\\)$

markdown killed one \

[efa]

I didn't even used lookbehind negative regexp: (?<!pattern) Did it mean: look for strings that is \\ and are at the of a line, and skip (negative)?

[efa]

other C99 new syntax hightlight other than the one asked in #21 should be the fixed size type: https://en.cppreference.com/w/c/types/integer

[efa]

other new types are:

ptrdiff_t
off_t
ssize_t
size_t
wchar_t

gcc -std=gnu99 accept those complex:

float complex      
long complex       
complex            
double complex     
long double complex

[unixwork]

size_t is not new in C99. It is also not a type of the language, just a typedef.

The best solution would probably be to highlight all words that end with _t, because that are probably always types (no sane C programmer would end a variable or function name with _t).

complex is similar to bool, it is not a language keyword, just a define. The language keywords are _Complex or _Bool. The libc provides headers for these defines (stdbool.h, complex.h), but the libc has a lot of defines and I can't add highlighting for everything.

[unixwork]

xnedit 1.4.0 has updated C syntax highlighting