Tighten up attribute recognition during parsing

Now it should be possible to use `[]` for wildcard patterns, for example:

  foo = foo.[hit]xx

Note that a leading bracket expression will still be recognized as attributes
and escaping or quoting it will inhibit pattern matching. To resolve this case
we need to specify an empty attribute list:

  foo = [] [abc]-foo.cxx

1 files changed, 6 insertions, 6 deletions

diff --git a/libbuild2/lexer.test.cxx b/libbuild2/lexer.test.cxx
index 32151db..eeed532 100644
--- a/libbuild2/lexer.test.cxx
+++ b/libbuild2/lexer.test.cxx
@@ -31,12 +31,12 @@ namespace build2
         quote = true;
       else
       {
-        if      (a == "normal")    m = lexer_mode::normal;
-        else if (a == "variable")  m = lexer_mode::variable;
-        else if (a == "value")     m = lexer_mode::value;
-        else if (a == "attribute") m = lexer_mode::attribute;
-        else if (a == "eval")      m = lexer_mode::eval;
-        else if (a == "buildspec") m = lexer_mode::buildspec;
+        if      (a == "normal")     m = lexer_mode::normal;
+        else if (a == "variable")   m = lexer_mode::variable;
+        else if (a == "value")      m = lexer_mode::value;
+        else if (a == "attributes") m = lexer_mode::attributes;
+        else if (a == "eval")       m = lexer_mode::eval;
+        else if (a == "buildspec")  m = lexer_mode::buildspec;
         else                       assert (false);
         break;
       }