Support c/c++ #if/#ifdef macros

[IF-ACT]

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Your programming languages

c/c++

Expected Behavior

#if SOME_CONDITION
#if INNER_CONDITION
  ...
#else
  ...
#endif
#endif

Consider rendering the # symbol with colors plz

[izhangzhihao]

I tried to implement this feature but found that nested #if macros do not have a fully functional implementation.

I could not highlight PSI elements inside the PsiComment blocks so this feature will be postponed until the full PSI tree support of the macros.

[izhangzhihao]

And this part of the PSI tree implementation is wrong....

[izhangzhihao]

I raised an issue to JetBrains: https://youtrack.jetbrains.com/issue/CPP-32914/Full-implementation-of-nested-if-ifdef-macros

[izhangzhihao]

The JB official said that "we have no way to build the AST inside non-compiled code. All actions with formatting inside the non-compiled code are doing with the set of heuristics over the lexer info."

So, there is no way this plugin could implement the highlighting feature for C++ macros for now. Let's close this ticket for now, maybe years later, we can re-visit this ticket again.

[izhangzhihao]

Now this becomes possible:

• CLion Nova ✅
• CLion Classic ✅
• IntelliJ with CLion plugin✅
• Rider✅
• Android Studio⚠️(You might notice that macros inside inactive branches (code disabled by false conditions) are not perfectly supported. This is because AS treats these entire uncompiled blocks as single, massive comments rather than actual code. Consequently, our plugin cannot detect the #if and #endif directives hidden inside them.)

Pls try this build snapshot and share your feedback:

intellij-rainbow-brackets-2025.3.8.zip

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👉 https://plugins.jetbrains.com/plugin/10080-rainbow-brackets/reviews

Thank you so much for your support! Happy coding! 🎨