[PATCH] D43522: [clang-format] New API guessLanguage()

[Ben Hamilton via Phabricator via cfe-commits]

benhamilton created this revision.
benhamilton added a reviewer: jolesiak.
Herald added subscribers: cfe-commits, klimek.
benhamilton added a reviewer: krasimir.

For clients which don't have a filesystem, calling getStyle() doesn't
make much sense (there's no .clang-format files to search for).

In this diff, I hoist out the language-guessing logic from getStyle()
and move it into a new API guessLanguage().

I also added support for guessing the language of files which have no
extension (they could be C++ or ObjC).

Test Plan: New tests added. Ran tests with:

  % make -j12 FormatTests && ./tools/clang/unittests/Format/FormatTests


Repository:
  rC Clang

https://reviews.llvm.org/D43522

Files:
  include/clang/Format/Format.h
  lib/Format/Format.cpp
  unittests/Format/FormatTest.cpp

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