deannagarcia added inline comments.
================
Comment at: clang-tidy/abseil/NoNamespaceCheck.cpp:23
+
+ Finder->addMatcher(namespaceDecl(hasName("absl")).bind("absl_namespace"),
+ this);
----------------
hokein wrote:
> JonasToth wrote:
> > hugoeg wrote:
> > > deannagarcia wrote:
> > > > aaron.ballman wrote:
> > > > > hokein wrote:
> > > > > > aaron.ballman wrote:
> > > > > > > I think this needs a `not(isExpansionInSystemHeader())` in there,
> > > > > > > as this is going to trigger on code that includes a header file
> > > > > > > using an `absl` namespace. If I'm incorrect and users typically
> > > > > > > include abseil as something other than system includes, you'll
> > > > > > > have to find a different way to solve this.
> > > > > > Yeah, we have discussed this issue internally. abseil-user code
> > > > > > usually includes abseil header like `#include
> > > > > > "whatever/abseil/base/optimization.h"`, so
> > > > > > `IsExpansionInSystemHeader` doesn't work for most cases.
> > > > > >
> > > > > > We need a way to filter out all headers being a part of abseil
> > > > > > library. I think we can create a matcher
> > > > > > `InExpansionInAbseilHeader` -- basically using
> > > > > > `IsExpansionInFileMatching` with a regex expression that matches
> > > > > > typical abseil include path. What do you think?
> > > > > >
> > > > > > And we'll have more abseil checks (e.g. `abseil-no-internal-deps`)
> > > > > > that use `InExpansionInAbseilHeader`, we should put it to a common
> > > > > > header.
> > > > > I think that is a sensible approach.
> > > > We will begin working on this, I think it will first be implemented in
> > > > abseil-no-internal-deps but once it looks good I will add it to this
> > > > patch.
> > > I'm going to go ahead a implement this in ASTMatchers.h and include it on
> > > the patch for **abseil-no-internal-dep**s
> > In principle it is ok, but I don't think ASTMatchers.h is the correct
> > place, because it is only of use to clang-tidy.
> >
> > There is a `util` directory in clang-tidy for this kind of stuff. Defining
> > you own matchers works the same as in ASTMatchers, you can grep through
> > clang-tidy checks (e.g. `AST_MATCHER`) to have some examples of private
> > matchers.
> `ASTMatchers.h` is not a reasonable place to put `asseil`-specific matchers.
> We have `clang-tidy/utils/Matchers.h` for putting clang-tidy specific
> matchers. I'm not sure whether it is reasonable to put abseil-specific
> matchers there. Maybe we create a `AbseilMatcher.h` file in
> `clang-tidy/abseil` directory?
I put it in clang-tidy/abseil for now but I can definitely move it to
clang-tidy/utils/ if you would prefer that
https://reviews.llvm.org/D50580
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