diff --git a/peglib.h b/peglib.h
index e3d5121..1ed6cef 100644
--- a/peglib.h
+++ b/peglib.h
@@ -1015,48 +1015,63 @@ struct AssignIDToDefinition : public Ope::Visitor
             op->accept(*this);
         }
     }
-    void visit(ZeroOrMore& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(OneOrMore& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(Option& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(AndPredicate& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(NotPredicate& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(LiteralString& ope) override {
-    }
-    void visit(CharacterClass& ope) override {
-    }
-    void visit(Character& ope) override {
-    }
-    void visit(AnyCharacter& ope) override {
-    }
-    void visit(Capture& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(Anchor& ope) override {
-        ope.ope_->accept(*this);
-    }
-    void visit(User& ope) override {
-    }
-    void visit(WeakHolder& ope) override {
-        ope.weak_.lock()->accept(*this);
-    }
+    void visit(ZeroOrMore& ope) override { ope.ope_->accept(*this); }
+    void visit(OneOrMore& ope) override { ope.ope_->accept(*this); }
+    void visit(Option& ope) override { ope.ope_->accept(*this); }
+    void visit(AndPredicate& ope) override { ope.ope_->accept(*this); }
+    void visit(NotPredicate& ope) override { ope.ope_->accept(*this); }
+    void visit(LiteralString& ope) override {}
+    void visit(CharacterClass& ope) override {}
+    void visit(Character& ope) override {}
+    void visit(AnyCharacter& ope) override {}
+    void visit(Capture& ope) override { ope.ope_->accept(*this); }
+    void visit(Anchor& ope) override { ope.ope_->accept(*this); }
+    void visit(User& ope) override {}
+    void visit(WeakHolder& ope) override { ope.weak_.lock()->accept(*this); }
     void visit(Holder& ope) override;
-    void visit(DefinitionReference& ope) override {
-        ope.get_rule()->accept(*this);
-    }
+    void visit(DefinitionReference& ope) override { ope.get_rule()->accept(*this); }
 
     std::unordered_map<void*, size_t> ids;
 };
 
+struct IsToken : public Ope::Visitor
+{
+    IsToken() : has_anchor(false), has_rule(false) {}
+
+    void visit(Sequence& ope) override {
+        for (auto op: ope.opes_) {
+            op->accept(*this);
+        }
+    }
+    void visit(PrioritizedChoice& ope) override {
+        for (auto op: ope.opes_) {
+            op->accept(*this);
+        }
+    }
+    void visit(ZeroOrMore& ope) override { ope.ope_->accept(*this); }
+    void visit(OneOrMore& ope) override { ope.ope_->accept(*this); }
+    void visit(Option& ope) override { ope.ope_->accept(*this); }
+    void visit(AndPredicate& ope) override { ope.ope_->accept(*this); }
+    void visit(NotPredicate& ope) override { ope.ope_->accept(*this); }
+    void visit(LiteralString& ope) override {}
+    void visit(CharacterClass& ope) override {}
+    void visit(Character& ope) override {}
+    void visit(AnyCharacter& ope) override {}
+    void visit(Capture& ope) override { ope.ope_->accept(*this); }
+    void visit(Anchor& ope) override { has_anchor = true; }
+    void visit(User& ope) override {}
+    void visit(WeakHolder& ope) override { ope.weak_.lock()->accept(*this); }
+    void visit(Holder& ope) override {}
+    void visit(DefinitionReference& ope) override { has_rule = true; }
+
+    bool is_token() const {
+        return has_anchor || !has_rule;
+    }
+
+    bool has_anchor;
+    bool has_rule;
+};
+
 /*
  * Definition
  */
@@ -1075,6 +1090,7 @@ public:
         : actions(1)
         , ignoreSemanticValue(false)
         , enablePackratParsing(false)
+        , is_token(false)
         , holder_(std::make_shared<Holder>(this)) {}
 
     Definition(const Definition& rhs)
@@ -1082,6 +1098,7 @@ public:
         , actions(1)
         , ignoreSemanticValue(false)
         , enablePackratParsing(false)
+        , is_token(false)
         , holder_(rhs.holder_)
     {
         holder_->outer_ = this;
@@ -1092,6 +1109,7 @@ public:
         , actions(1)
         , ignoreSemanticValue(rhs.ignoreSemanticValue)
         , enablePackratParsing(rhs.enablePackratParsing)
+        , is_token(rhs.is_token)
         , holder_(std::move(rhs.holder_))
     {
         holder_->outer_ = this;
@@ -1101,9 +1119,10 @@ public:
         : actions(1)
         , ignoreSemanticValue(false)
         , enablePackratParsing(false)
+        , is_token(false)
         , holder_(std::make_shared<Holder>(this))
     {
-        holder_->ope_ = ope;
+        *this <= ope;
     }
 
     operator std::shared_ptr<Ope>() {
@@ -1111,7 +1130,12 @@ public:
     }
 
     Definition& operator<=(const std::shared_ptr<Ope>& ope) {
+        IsToken isToken;
+        ope->accept(isToken);
+        is_token = isToken.is_token();
+
         holder_->ope_ = ope;
+
         return *this;
     }
 
@@ -1202,6 +1226,7 @@ public:
     std::function<std::string ()> error_message;
     bool                          ignoreSemanticValue;
     bool                          enablePackratParsing;
+    bool                          is_token;
 
 private:
     friend class DefinitionReference;
diff --git a/test/test.cc b/test/test.cc
index 49d5973..c6d2f5a 100644
--- a/test/test.cc
+++ b/test/test.cc
@@ -178,6 +178,25 @@ TEST_CASE("Visit test", "[general]")
     REQUIRE(defIds.ids.size() == 4);
 }
 
+TEST_CASE("Token check test", "[general]")
+{
+    peg parser(
+        "  EXPRESSION       <-  _ TERM (TERM_OPERATOR TERM)*      "
+        "  TERM             <-  FACTOR (FACTOR_OPERATOR FACTOR)*  "
+        "  FACTOR           <-  NUMBER / '(' _ EXPRESSION ')' _   "
+        "  TERM_OPERATOR    <-  < [-+] > _                        "
+        "  FACTOR_OPERATOR  <-  < [/*] > _                        "
+        "  NUMBER           <-  < [0-9]+ > _                      "
+        "  ~_               <-  [ \t\r\n]*                        "
+        );
+
+    REQUIRE(parser["EXPRESSION"].is_token == false);
+    REQUIRE(parser["FACTOR"].is_token == false);
+    REQUIRE(parser["FACTOR_OPERATOR"].is_token == true);
+    REQUIRE(parser["NUMBER"].is_token == true);
+    REQUIRE(parser["_"].is_token == true);
+}
+
 TEST_CASE("Lambda action test", "[general]")
 {
     peg parser(