parse.y: ripper_lex_state_name

* parse.y (ripper_lex_state_name): represent lex_state as OR-ed
  form.

* ext/ripper/lib/ripper/lexer.rb (Ripper::Lexer::Elem#to_a):
  lex_state for inspection.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59949 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/ripper/lib/ripper/lexer.rb

@@ -47,6 +47,33 @@ class Ripper
 
   class Lexer < ::Ripper   #:nodoc: internal use only
     Elem = Struct.new(:pos, :event, :tok, :state)
+    class Elem
+      class List < ::Array
+        def inspect
+          [pos, event, tok, Ripper.lex_state_name(state)].inspect
+        end
+
+        def pretty_print(q) # :nodoc:
+          q.group(1, '[', ']') {
+            q.pp pos
+            q.comma_breakable
+            q.pp event
+            q.comma_breakable
+            q.pp tok
+            q.comma_breakable
+            q.text(Ripper.lex_state_name(state))
+          }
+        end
+
+        def pretty_print_cycle(q) # :nodoc:
+          q.text('[...]')
+        end
+      end
+
+      def to_a
+        List[*values]
+      end
+    end
 
     def tokenize
       parse().sort_by(&:pos).map(&:tok)

parse.y

@@ -568,6 +568,7 @@ RUBY_SYMBOL_EXPORT_BEGIN
 VALUE rb_parser_reg_compile(struct parser_params* parser, VALUE str, int options);
 int rb_reg_fragment_setenc(struct parser_params*, VALUE, int);
 enum lex_state_e rb_parser_trace_lex_state(struct parser_params *, enum lex_state_e, enum lex_state_e, int);
+VALUE rb_parser_lex_state_name(enum lex_state_e state);
 void rb_parser_show_bitstack(struct parser_params *, stack_type, const char *, int);
 PRINTF_ARGS(void rb_parser_fatal(struct parser_params *parser, const char *fmt, ...), 2, 3);
 RUBY_SYMBOL_EXPORT_END
@@ -9191,6 +9192,12 @@ rb_parser_trace_lex_state(struct parser_params *parser, enum lex_state_e from,
     return to;
 }
 
+VALUE
+rb_parser_lex_state_name(enum lex_state_e state)
+{
+    return append_lex_state_name(state, rb_str_new(0, 0));
+}
+
 static void
 append_bitstack_value(stack_type stack, VALUE mesg)
 {
@@ -11484,6 +11491,11 @@ ripper_value(VALUE self, VALUE obj)
 }
 #endif
 
+static VALUE
+ripper_lex_state_name(VALUE self, VALUE state)
+{
+    return rb_parser_lex_state_name(NUM2INT(state));
+}
 
 void
 Init_ripper(void)
@@ -11526,6 +11538,8 @@ InitVM_ripper(void)
     rb_define_singleton_method(Ripper, "dedent_string", parser_dedent_string, 2);
     rb_define_private_method(Ripper, "dedent_string", parser_dedent_string, 2);
 
+    rb_define_singleton_method(Ripper, "lex_state_name", ripper_lex_state_name, 1);
+
 <% @exprs.each do |expr, desc| -%>
     /* <%=desc%> */
     rb_define_const(Ripper, "<%=expr%>", INT2NUM(<%=expr%>));