parse.y: refine error message

* parse.y (parser_number_literal_suffix): refine error message for
  extra dot and digits.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46179 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue May 27 23:06:46 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (parser_number_literal_suffix): refine error message for
+	  extra dot and digits.
+
 Tue May 27 22:44:20 2014  Tanaka Akira  <akr@fsij.org>
 
 	* test/rexml: Avoid fd leaks.

parse.y

@@ -5594,6 +5594,8 @@ parser_str_new(const char *p, long n, rb_encoding *enc, int func, rb_encoding *e
 #define lex_eol_p() (lex_p >= lex_pend)
 #define peek(c) peek_n((c), 0)
 #define peek_n(c,n) (lex_p+(n) < lex_pend && (c) == (unsigned char)lex_p[n])
+#define peekc() peekc_n(0)
+#define peekc_n(n) (lex_p+(n) < lex_pend ? (unsigned char)lex_p[n] : -1)
 
 static inline int
 parser_nextc(struct parser_params *parser)
@@ -6453,6 +6455,14 @@ parser_number_literal_suffix(struct parser_params *parser, int mask)
 	    return 0;
 	}
 	pushback(c);
+	if (c == '.') {
+	    c = peekc_n(1);
+	    if (ISDIGIT(c)) {
+		yyerror("unexpected fraction part after numeric literal");
+		lex_p += 2;
+		while (parser_is_identchar()) nextc();
+	    }
+	}
 	break;
     }
     return result;

test/ruby/test_syntax.rb

@@ -426,6 +426,15 @@ eom
     end
   end
 
+  def test_unexpected_fraction
+    msg = /unexpected fraction/
+    assert_syntax_error("0x0.0", msg)
+    assert_syntax_error("0b0.0", msg)
+    assert_syntax_error("0d0.0", msg)
+    assert_syntax_error("0o0.0", msg)
+    assert_syntax_error("0.0.0", msg)
+  end
+
   private
 
   def not_label(x) @result = x; @not_label ||= nil end