remove the lex_rule keyword (use rule instead)

"lex_rule" is lexed as "rule" for backward compatibility

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/semagramme/libcaml-grew/trunk@8955 7838e531-6607-4d57-9587-6c381814729c

src/grew_lexer.mll

@@ -183,7 +183,7 @@ and standard target = parse
 | "module"      { MODULE }
 | "confluent"   { CONFLUENT }
 | "rule"        { RULE }
-| "lex_rule"    { LEX_RULE }
+| "lex_rule"    { Log.fwarning "[file %s, line %d]\"lex_rule\" is deprecated, please use \"rule\" instead" ! Global.current_file !Global.current_line; RULE }
 | "filter"      { FILTER }
 | "sequences"   { SEQUENCES }
 

src/grew_parser.mly

@@ -76,7 +76,6 @@ let localize t = (t,get_loc ())
 %token MODULE                      /* module */
 %token CONFLUENT                   /* confluent */
 %token RULE                        /* rule */
-%token LEX_RULE                    /* lex_rule */
 %token FILTER                      /* filter */
 %token SEQUENCES                   /* sequences */
 %token GRAPH                       /* graph */
@@ -334,7 +333,7 @@ rule:
                 rule_loc = snd id_loc;
               }
             }
-        | doc=option(COMMENT) LEX_RULE id_loc=simple_id_with_loc param=param LACC p=pos_item n=list(neg_item) cmds=commands RACC lex_par=option(lex_par)
+        | doc=option(COMMENT) RULE id_loc=simple_id_with_loc param=param LACC p=pos_item n=list(neg_item) cmds=commands RACC lex_par=option(lex_par)
             {
               { Ast.rule_id = fst id_loc;
                 pattern = Ast.complete_pattern { Ast.pat_pos = p; Ast.pat_negs = n };