Add Lua-style long brackets and long comments to CMake language

Teach the CMake language parser to recognize Lua-style "long bracket"
arguments.  These start with two '[' separated by zero or more '='
characters e.g. "[[" or "[=[" or "[==[".  They end with two ']'
separated by the same number of '=' as the opening bracket.  There is no
nesting of brackets of the same level (number of '=').  No escapes,
variable expansion, or other processing is performed on the content
between such brackets so they always represent exactly one argument.

Also teach CMake to parse and ignore "long comment" syntax.  A long
comment starts with "#" immediately followed by an opening long bracket.
It ends at the matching close long bracket.

Teach the RunCMake.Syntax test to cover long bracket and long comment
cases.

1 files changed, 2 insertions, 1 deletions

diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index 7bb3b346c4..bede25e658 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -28,7 +28,8 @@ struct cmListFileArgument
   enum Delimiter
     {
     Unquoted,
-    Quoted
+    Quoted,
+    Bracket
     };
   cmListFileArgument(): Value(), Delim(Unquoted), FilePath(0), Line(0) {}
   cmListFileArgument(const cmListFileArgument& r):