Topic content filter fallback

CONTRIBUTING.md

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+Any contribution that you make to this repository will
+be under the Apache 2 License, as dictated by that
+[license](http://www.apache.org/licenses/LICENSE-2.0.html):
+
+~~~
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+~~~
+
+Contributors must sign-off each commit by adding a `Signed-off-by: ...`
+line to commit messages to certify that they have the right to submit
+the code they are contributing to the project according to the
+[Developer Certificate of Origin (DCO)](https://developercertificate.org/).

LICENSE

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+
+                                 Apache License
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README.md

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+# common_content_filter
+
+This repository contains packages to support content filter fallback used in rcl.
+
+ - [common_content_filter](common_content_filter/README.md)

common_content_filter/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.8)
+project(common_content_filter)
+
+
+if(NOT CMAKE_CXX_STANDARD)
+  set(CMAKE_CXX_STANDARD 17)
+endif()
+
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+
+# find dependencies
+find_package(ament_cmake REQUIRED)
+find_package(rcutils REQUIRED)
+find_package(rcpputils REQUIRED)
+find_package(rmw REQUIRED)
+find_package(rmw_implementation REQUIRED)
+find_package(rosidl_typesupport_introspection_c REQUIRED)
+find_package(rosidl_typesupport_introspection_cpp REQUIRED)
+
+add_library(${PROJECT_NAME}_library SHARED
+  src/api.cpp
+  src/DDSFilterCompoundCondition.cpp
+  src/DDSFilterExpression.cpp
+  src/DDSFilterExpressionParser.cpp
+  src/DDSFilterFactory.cpp
+  src/DDSFilterField.cpp
+  src/DDSFilterParameter.cpp
+  src/DDSFilterPredicate.cpp
+  src/DDSFilterValue.cpp
+  src/Utilities.cpp)
+
+set_target_properties(${PROJECT_NAME}_library
+  PROPERTIES OUTPUT_NAME ${PROJECT_NAME})
+
+target_include_directories(${PROJECT_NAME}_library
+  PUBLIC
+  "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
+  "$<INSTALL_INTERFACE:include/${PROJECT_NAME}>"
+  PRIVATE
+  ${PROJECT_SOURCE_DIR}/thirdparty/taocpp-pegtl)
+
+ament_target_dependencies(${PROJECT_NAME}_library
+  "rcpputils"
+  "rcutils"
+  "rmw"
+  "rmw_implementation"
+  "rosidl_typesupport_introspection_c"
+  "rosidl_typesupport_introspection_cpp"
+)
+
+# Causes the visibility macros to use dllexport rather than dllimport,
+# which is appropriate when building the dll but not consuming it.
+target_compile_definitions(${PROJECT_NAME}_library
+  PRIVATE "COMMON_CONTENT_FILTER_BUILDING_LIBRARY")
+
+install(
+  TARGETS ${PROJECT_NAME}_library EXPORT ${PROJECT_NAME}_library
+  ARCHIVE DESTINATION lib
+  LIBRARY DESTINATION lib
+  RUNTIME DESTINATION bin
+)
+
+# Export old-style CMake variables
+ament_export_include_directories("include/${PROJECT_NAME}")
+ament_export_libraries(${PROJECT_NAME}_library)
+
+# Export modern CMake targets
+ament_export_targets(${PROJECT_NAME}_library)
+
+ament_export_dependencies(ament_cmake_core)
+ament_export_dependencies(rcpputils)
+ament_export_dependencies(rcutils)
+ament_export_dependencies(rmw)
+ament_export_dependencies(rmw_implementation)
+ament_export_dependencies(rosidl_typesupport_introspection_c)
+ament_export_dependencies(rosidl_typesupport_introspection_cpp)
+
+install(
+  DIRECTORY include/
+  DESTINATION include/${PROJECT_NAME})
+
+if(BUILD_TESTING)
+  find_package(ament_cmake_gtest REQUIRED)
+  find_package(ament_lint_auto REQUIRED)
+  find_package(test_msgs REQUIRED)
+  find_package(osrf_testing_tools_cpp REQUIRED)
+
+  # the following line skips the linter which checks for copyrights
+  # comment the line when a copyright and license is added to all source files
+  set(ament_cmake_copyright_FOUND TRUE)
+  # the following line skips cpplint (only works in a git repo)
+  # comment the line when this package is in a git repo and when
+  # a copyright and license is added to all source files
+  set(ament_cmake_cpplint_FOUND TRUE)
+  # the following line skips uncrustify (TODO. use pegtl as a new package(e.g. pegtl_vendor))
+  set(ament_cmake_uncrustify_FOUND TRUE)
+  ament_lint_auto_find_test_dependencies()
+
+  ament_add_gtest(test_api test/test_api.cpp)
+  target_link_libraries(test_api ${PROJECT_NAME}_library)
+  ament_target_dependencies(test_api test_msgs osrf_testing_tools_cpp rmw)
+endif()
+
+ament_package()