[PATCH] D28896: [FileCheck] Add directive for checking for blank lines

[James Henderson via Phabricator via llvm-commits]

jhenderson created this revision.

There is currently no reliable way in FileCheck to check that a line is completely empty. The expected way of using "CHECK: {{^$}}" does not work because the '^' matches the end of the previous match (this behaviour may be desirable in certain instances). For the same reason, "CHECK-NEXT: {{^$}}" will fail when the previous match was at the end of the line, as the pattern will match there. Using the recommended [[:space:]] to match an explicit new line could also match a space, and thus is not always desired. Literal '\n' matches also do not seem to work.

This change adds a new directive that behaves the same as CHECK-NEXT, except that it only matches against empty lines. As with CHECK-NEXT, it will fail if more than one newline occurs before the next blank line. Example usage:
; test.txt
foo

bar
; CHECK: foo
; CHECK-EMPTY:
; CHECK-NEXT: bar


https://reviews.llvm.org/D28896

Files:
  docs/CommandGuide/FileCheck.rst
  test/FileCheck/check-empty-tag.txt
  utils/FileCheck/FileCheck.cpp

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