[cfe-dev] how to implement "statement P is followed by statement Q" matcher?

[Richard]

In article <1432806087.2498925.280264065.1368E918 at webmail.messagingengine.com>,
    Gabor Kozar <kozargabor at fastmail.fm> writes:

> I don't think you'd really be able to do this with matchers without
> major modifications to the matcher architecture.

Why do you say that?  All the information is available from within
CompoundStmt provided I have the other two matchers.  That's what I
currently do now in the callback -- walk the CompoundStmt looking for
the two consecutive statements that match my criteria (simplified and
hard-coded for my case):

  CompoundStmt::const_body_iterator BeforeIt = Compound->body_begin();
  CompoundStmt::const_body_iterator AfterIt = Compound->body_begin();
  for (++AfterIt;
       AfterIt != Compound->body_end() && *BeforeIt != Ret;
       ++BeforeIt, ++AfterIt) {
    if (auto *If = dyn_cast<IfStmt>(*BeforeIt)) {
      if (*AfterIt == Ret) {
        // ...
      }
    }
  }

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