diff --git a/lib/lrama/output.rb b/lib/lrama/output.rb
index 5bc4d1ab..95747ce4 100644
--- a/lib/lrama/output.rb
+++ b/lib/lrama/output.rb
@@ -41,11 +41,8 @@ def self.erb(input)
       end
     end
 
-    def eval_template(file, path)
-      erb = self.class.erb(File.read(file))
-      erb.filename = file
-      tmp = erb.result_with_hash(context: @context, output: self)
-      replace_special_variables(tmp, path)
+    def render_partial(file)
+      render_template(partial_file(file))
     end
 
     def render
@@ -354,6 +351,17 @@ def b4_cpp_guard__b4_spec_mapped_header_file
 
     private
 
+    def eval_template(file, path)
+      tmp = render_template(file)
+      replace_special_variables(tmp, path)
+    end
+
+    def render_template(file)
+      erb = self.class.erb(File.read(file))
+      erb.filename = file
+      erb.result_with_hash(context: @context, output: self)
+    end
+
     def template_file
       File.join(template_dir, @template_name)
     end
@@ -362,6 +370,10 @@ def header_template_file
       File.join(template_dir, "bison/yacc.h")
     end
 
+    def partial_file(file)
+      File.join(template_dir, file)
+    end
+
     def template_dir
       File.expand_path("../../../template", __FILE__)
     end
diff --git a/spec/lrama/output_spec.rb b/spec/lrama/output_spec.rb
index 7a143244..91f1283c 100644
--- a/spec/lrama/output_spec.rb
+++ b/spec/lrama/output_spec.rb
@@ -6,17 +6,22 @@
       out: out,
       output_file_path: "y.tab.c",
       template_name: "bison/yacc.c",
-      grammar_file_path: "parse.tmp.y",
+      grammar_file_path: grammar_file_path,
       header_out: header_out,
-      header_file_path: "y.tab.h",
+      header_file_path: header_file_path,
       context: context,
       grammar: grammar,
     )
   }
   let(:out) { StringIO.new }
   let(:header_out) { StringIO.new }
-  let(:context) { double("context") }
-  let(:grammar) { double("grammar") }
+  let(:warning) { Lrama::Warning.new(StringIO.new) }
+  let(:text) { File.read(grammar_file_path) }
+  let(:grammar) { Lrama::Parser.new(text).parse }
+  let(:states) { s = Lrama::States.new(grammar, warning); s.compute; s }
+  let(:context) { Lrama::Context.new(states) }
+  let(:grammar_file_path) { fixture_path("common/basic.y") }
+  let(:header_file_path) { "y.tab.h" }
 
   describe "#parse_param" do
     it "returns declaration of parse param without blanks" do
@@ -145,4 +150,51 @@
       expect(output.lex_param_name).to eq("lex_param")
     end
   end
+
+  describe "#render" do
+    context "header_file_path is specified" do
+      before do
+        output.render
+        out.rewind
+        header_out.rewind
+      end
+
+      it "renders C file and header file" do
+        expect(out.size).not_to eq 0
+        expect(header_out.size).not_to eq 0
+      end
+
+      it "doesn't include [@oline@] and [@ofile@] in files" do
+        o = out.read
+        h = header_out.read
+
+        expect(o).not_to match /\[@oline@\]/
+        expect(o).not_to match /\[@ofile@\]/
+        expect(h).not_to match /\[@oline@\]/
+        expect(h).not_to match /\[@ofile@\]/
+      end
+    end
+
+    context "header_file_path is not specified" do
+      let(:header_file_path) { nil }
+
+      before do
+        output.render
+        out.rewind
+        header_out.rewind
+      end
+
+      it "renders only C file" do
+        expect(out.size).not_to eq 0
+        expect(header_out.size).to eq 0
+      end
+
+      it "doesn't include [@oline@] and [@ofile@] in a file" do
+        o = out.read
+
+        expect(o).not_to match /\[@oline@\]/
+        expect(o).not_to match /\[@ofile@\]/
+      end
+    end
+  end
 end
diff --git a/template/bison/_yacc.h b/template/bison/_yacc.h
new file mode 100644
index 00000000..2af4d1e1
--- /dev/null
+++ b/template/bison/_yacc.h
@@ -0,0 +1,71 @@
+<%# b4_shared_declarations -%>
+  <%-# b4_cpp_guard_open([b4_spec_mapped_header_file]) -%>
+    <%- if output.spec_mapped_header_file -%>
+#ifndef <%= output.b4_cpp_guard__b4_spec_mapped_header_file %>
+# define <%= output.b4_cpp_guard__b4_spec_mapped_header_file %>
+    <%- end -%>
+  <%-# b4_declare_yydebug & b4_YYDEBUG_define -%>
+/* Debug traces.  */
+#ifndef YYDEBUG
+# define YYDEBUG 0
+#endif
+#if YYDEBUG && !defined(yydebug)
+extern int yydebug;
+#endif
+  <%-# b4_percent_code_get([[requires]]). %code is not supported -%>
+
+  <%-# b4_token_enums_defines -%>
+/* Token kinds.  */
+#ifndef YYTOKENTYPE
+# define YYTOKENTYPE
+  enum yytokentype
+  {
+<%= output.token_enums -%>
+  };
+  typedef enum yytokentype yytoken_kind_t;
+#endif
+
+  <%-# b4_declare_yylstype -%>
+    <%-# b4_value_type_define -%>
+/* Value type.  */
+#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
+union YYSTYPE
+{
+#line <%= output.grammar.union.lineno %> "<%= output.grammar_file_path %>"
+<%= output.grammar.union.braces_less_code %>
+#line [@oline@] [@ofile@]
+
+};
+typedef union YYSTYPE YYSTYPE;
+# define YYSTYPE_IS_TRIVIAL 1
+# define YYSTYPE_IS_DECLARED 1
+#endif
+
+    <%-# b4_location_type_define -%>
+/* Location type.  */
+#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
+typedef struct YYLTYPE YYLTYPE;
+struct YYLTYPE
+{
+  int first_line;
+  int first_column;
+  int last_line;
+  int last_column;
+};
+# define YYLTYPE_IS_DECLARED 1
+# define YYLTYPE_IS_TRIVIAL 1
+#endif
+
+
+
+
+  <%-# b4_declare_yyerror_and_yylex. Not supported -%>
+  <%-# b4_declare_yyparse -%>
+int yyparse (<%= output.parse_param %>);
+
+
+  <%-# b4_percent_code_get([[provides]]). %code is not supported -%>
+  <%-# b4_cpp_guard_close([b4_spec_mapped_header_file]) -%>
+    <%- if output.spec_mapped_header_file -%>
+#endif /* !<%= output.b4_cpp_guard__b4_spec_mapped_header_file %>  */
+    <%- end -%>
diff --git a/template/bison/yacc.c b/template/bison/yacc.c
index 15abbe54..840afc22 100644
--- a/template/bison/yacc.c
+++ b/template/bison/yacc.c
@@ -106,77 +106,7 @@
 <%- else -%>
 /* Use api.header.include to #include this header
    instead of duplicating it here.  */
-<%# b4_shared_declarations -%>
-  <%-# b4_cpp_guard_open([b4_spec_mapped_header_file]) -%>
-    <%- if output.spec_mapped_header_file -%>
-#ifndef <%= output.b4_cpp_guard__b4_spec_mapped_header_file %>
-# define <%= output.b4_cpp_guard__b4_spec_mapped_header_file %>
-    <%- end -%>
-  <%-# b4_declare_yydebug & b4_YYDEBUG_define -%>
-/* Debug traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG 0
-#endif
-#if YYDEBUG && !defined(yydebug)
-extern int yydebug;
-#endif
-  <%-# b4_percent_code_get([[requires]]). %code is not supported -%>
-
-  <%-# b4_token_enums_defines -%>
-/* Token kinds.  */
-#ifndef YYTOKENTYPE
-# define YYTOKENTYPE
-  enum yytokentype
-  {
-<%= output.token_enums -%>
-  };
-  typedef enum yytokentype yytoken_kind_t;
-#endif
-
-  <%-# b4_declare_yylstype -%>
-    <%-# b4_value_type_define -%>
-/* Value type.  */
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-union YYSTYPE
-{
-#line <%= output.grammar.union.lineno %> "<%= output.grammar_file_path %>"
-<%= output.grammar.union.braces_less_code %>
-#line [@oline@] [@ofile@]
-
-};
-typedef union YYSTYPE YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1
-# define YYSTYPE_IS_DECLARED 1
-#endif
-
-    <%-# b4_location_type_define -%>
-/* Location type.  */
-#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE YYLTYPE;
-struct YYLTYPE
-{
-  int first_line;
-  int first_column;
-  int last_line;
-  int last_column;
-};
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif
-
-
-
-
-  <%-# b4_declare_yyerror_and_yylex. Not supported -%>
-  <%-# b4_declare_yyparse -%>
-int yyparse (<%= output.parse_param %>);
-
-
-  <%-# b4_percent_code_get([[provides]]). %code is not supported -%>
-  <%-# b4_cpp_guard_close([b4_spec_mapped_header_file]) -%>
-    <%- if output.spec_mapped_header_file -%>
-#endif /* !<%= output.b4_cpp_guard__b4_spec_mapped_header_file %>  */
-    <%- end -%>
+<%= output.render_partial("bison/_yacc.h") %>
 <%- end -%>
 <%# b4_declare_symbol_enum -%>
 /* Symbol kind.  */
diff --git a/template/bison/yacc.h b/template/bison/yacc.h
index 7cdeb81d..848dbf59 100644
--- a/template/bison/yacc.h
+++ b/template/bison/yacc.h
@@ -37,75 +37,4 @@
 /* DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
    especially those whose name start with YY_ or yy_.  They are
    private implementation details that can be changed or removed.  */
-
-<%# b4_shared_declarations -%>
-  <%-# b4_cpp_guard_open([b4_spec_mapped_header_file]) -%>
-    <%- if output.spec_mapped_header_file -%>
-#ifndef <%= output.b4_cpp_guard__b4_spec_mapped_header_file %>
-# define <%= output.b4_cpp_guard__b4_spec_mapped_header_file %>
-    <%- end -%>
-  <%-# b4_declare_yydebug & b4_YYDEBUG_define -%>
-/* Debug traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG 0
-#endif
-#if YYDEBUG && !defined(yydebug)
-extern int yydebug;
-#endif
-  <%-# b4_percent_code_get([[requires]]). %code is not supported -%>
-
-  <%-# b4_token_enums_defines -%>
-/* Token kinds.  */
-#ifndef YYTOKENTYPE
-# define YYTOKENTYPE
-  enum yytokentype
-  {
-<%= output.token_enums -%>
-  };
-  typedef enum yytokentype yytoken_kind_t;
-#endif
-
-  <%-# b4_declare_yylstype -%>
-    <%-# b4_value_type_define -%>
-/* Value type.  */
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-union YYSTYPE
-{
-#line <%= output.grammar.union.lineno %> "<%= output.grammar_file_path %>"
-<%= output.grammar.union.braces_less_code %>
-#line [@oline@] [@ofile@]
-
-};
-typedef union YYSTYPE YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1
-# define YYSTYPE_IS_DECLARED 1
-#endif
-
-    <%-# b4_location_type_define -%>
-/* Location type.  */
-#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE YYLTYPE;
-struct YYLTYPE
-{
-  int first_line;
-  int first_column;
-  int last_line;
-  int last_column;
-};
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif
-
-
-
-
-  <%-# b4_declare_yyerror_and_yylex. Not supported -%>
-  <%-# b4_declare_yyparse -%>
-int yyparse (<%= output.parse_param %>);
-
-
-  <%-# b4_percent_code_get([[provides]]). %code is not supported -%>
-  <%-# b4_cpp_guard_close([b4_spec_mapped_header_file]) -%>
-    <%- if output.spec_mapped_header_file -%>
-#endif /* !<%= output.b4_cpp_guard__b4_spec_mapped_header_file %>  */
-    <%- end -%>
+<%= output.render_partial("bison/_yacc.h") %>