introduced true block and EOL comments

* The previous convention of !* ... *! are now true block comments,
  i.e. they are parsed faster, don't spam the goto table and allow
  embedding of exclamation marks - only "*!" terminates the comment.
* It is therefore now forbidden to have goto labels beginning with "*".
* Also support "!!" to introduce EOL comments (like C++'s //).
  This disallows empty labels, but they weren't useful anyway.
  This is the shortest way to begin a comment.
* All comment labels have been converted to true comments, to ensure
  that syntax highlighting works correctly.
  EOL comments are used for single line commented-out code, since it's
  easiest to uncomment - you don't have to jump to the line end.
  This is a pure convention / coding style.
  Other people might do it differently.
* It's of course still possible to abuse goto labels as comments
  as TECO did for ages.
* In lexing / syntax highlighting, labels and comments are highlighted differently.
* When syntax highlighting, a single "!" will first be highlighted as a label
  since it's not yet unambiguous. Once you type the second character (* or !),
  the first character is retroactively styled as a comment as well.

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/lexer.tes b/lib/lexer.tes
index bd742a0..2676e1b 100644
--- a/lib/lexer.tes
+++ b/lib/lexer.tes
@@ -1,6 +1,6 @@
-! Lexer configuration and styles (ED hook) !
+!* Lexer configuration and styles (ED hook) *!
 
-! Match Q-Reg "_" against beginning of current doc's first line !
+!* Match Q-Reg "_" against beginning of current doc's first line *!
 @[lexer.checkheader]{
   [: 0,(1ESPOSITIONFROMLINE:)::S ]:
 }
@@ -16,7 +16,7 @@
   [_
 }
 
-! Automatically mung all the lexers and add them to "lexer.auto" !
+!* Automatically mung all the lexers and add them to "lexer.auto" *!
 [*
   EQ.[lexers]
   [_ 1ENQ[$SCITECOPATH]/lexers/*.tes ]_ J