[PATCH] D18695: [clang-tidy] Reduce false-positive ratio in misc-suspicious-missing-comma check.

[Etienne Bergeron via cfe-commits]

etienneb created this revision.
etienneb added a reviewer: alexfh.
etienneb added a subscriber: cfe-commits.

This patch is adding detection of common string literal patterns
that should not trigger warnings.

  [*] Add a limit on the number of concatenated token,
  [*] Add support for parenthese sequence of tokens,
  [*] Add detection of valid indentation.

As an example, this code will no longer trigger a warning:
```
const char* Array[] = {
  "first literal"
    "indented literal"
    "indented literal",
  "second literal",
  [...]
```

http://reviews.llvm.org/D18695

Files:
  clang-tidy/misc/SuspiciousMissingCommaCheck.cpp
  clang-tidy/misc/SuspiciousMissingCommaCheck.h
  test/clang-tidy/misc-suspicious-missing-comma.cpp

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