diff --git a/MIT-LICENSE b/MIT-LICENSE
new file mode 100644
index 0000000..9df1f93
--- /dev/null
+++ b/MIT-LICENSE
@@ -0,0 +1,20 @@
+Copyright (c) 2009.
+ 
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+ 
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+ 
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/expression_parser-0.9.0.gem b/expression_parser-0.9.0.gem
new file mode 100644
index 0000000..95785c5
Binary files /dev/null and b/expression_parser-0.9.0.gem differ
diff --git a/rubygem-expression_parser.spec b/rubygem-expression_parser.spec
new file mode 100644
index 0000000..4782b33
--- /dev/null
+++ b/rubygem-expression_parser.spec
@@ -0,0 +1,61 @@
+%global gem_name expression_parser
+Name:                rubygem-%{gem_name}
+Version:             0.9.0
+Release:             1
+Summary:             A math parser
+License:             MIT
+URL:                 http://lukaszwrobel.pl/blog/math-parser-part-3-implementation
+Source0:             https://rubygems.org/gems/%{gem_name}-%{version}.gem
+# https://github.com/nricciar/expression_parser/blob/master/MIT-LICENSE
+Source1:             MIT-LICENSE
+Requires:            ruby(release) ruby(rubygems)
+BuildRequires:       ruby(release) rubygems-devel rubygem(rspec) < 3
+BuildArch:           noarch
+Provides:            rubygem(%{gem_name}) = %{version}
+%description
+A math parser
+
+%package doc
+Summary:             Documentation for %{name}
+Requires:            %{name} = %{version}-%{release}
+BuildArch:           noarch
+%description doc
+Documentation for %{name}
+
+%prep
+gem unpack %{SOURCE0}
+%setup -q -D -T -n  %{gem_name}-%{version}
+gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
+rm Rakefile
+sed -ri "s|\"Rakefile\"(\.freeze)?,||g" %{gem_name}.gemspec
+
+%build
+gem build %{gem_name}.gemspec
+%gem_install
+
+%install
+mkdir -p %{buildroot}%{gem_dir}
+cp -pa .%{gem_dir}/* \
+        %{buildroot}%{gem_dir}/
+install -m 0644 -p %{SOURCE1} %{buildroot}%{gem_instdir}/MIT-LICENSE
+
+%check
+pushd .%{gem_instdir}
+  rspec2 parser_spec.rb
+popd
+
+%files
+%dir %{gem_instdir}
+%doc %{gem_instdir}/MIT-LICENSE
+%doc %{gem_instdir}/README
+%{gem_libdir}
+%exclude %{gem_cache}
+%{gem_spec}
+
+%files doc
+%doc %{gem_docdir}
+%exclude %{gem_instdir}/parser_spec.rb
+
+%changelog
+* Fri Aug 21 2020 fanjiachen <fanjiachen3@huawei.com> - 0.9.0-1
+- package init
diff --git a/rubygem-expression_parser.yaml b/rubygem-expression_parser.yaml
new file mode 100644
index 0000000..682b527
--- /dev/null
+++ b/rubygem-expression_parser.yaml
@@ -0,0 +1,4 @@
+version_control: github
+src_repo: nricciar/expression_parser
+tag_prefix: "v"
+seperator: "."