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, 3 insertions, 0 deletions

diff --git a/Source/cmListFileLexer.h b/Source/cmListFileLexer.h
index 719347c1ab..bd2868ab6b 100644
--- a/Source/cmListFileLexer.h
+++ b/Source/cmListFileLexer.h
@@ -22,7 +22,10 @@ typedef enum cmListFileLexer_Type_e
   cmListFileLexer_Token_ParenRight,
   cmListFileLexer_Token_ArgumentUnquoted,
   cmListFileLexer_Token_ArgumentQuoted,
+  cmListFileLexer_Token_ArgumentBracket,
+  cmListFileLexer_Token_CommentBracket,
   cmListFileLexer_Token_BadCharacter,
+  cmListFileLexer_Token_BadBracket,
   cmListFileLexer_Token_BadString
 } cmListFileLexer_Type;