# Copyright 2021 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

import("//build_overrides/pigweed.gni")

import("$dir_pw_build/target_types.gni")
import("$dir_pw_docgen/docs.gni")
import("$dir_pw_unit_test/test.gni")

config("public_include_path") {
  include_dirs = [ "public" ]
  visibility = [ ":*" ]
}

pw_source_set("pw_polyfill") {
  public_configs = [ ":public_include_path" ]
  remove_public_deps = [ "*" ]
  public_deps = [ ":standard_library" ]
  public = [
    "public/pw_polyfill/language_feature_macros.h",
    "public/pw_polyfill/standard.h",
  ]
}

config("bit_overrides_config") {
  include_dirs = [ "bit_public_overrides" ]
  visibility = [ ":*" ]
}

config("cstddef_overrides_config") {
  include_dirs = [ "cstddef_public_overrides" ]
  visibility = [ ":*" ]
}

config("iterator_overrides_config") {
  include_dirs = [ "iterator_public_overrides" ]
  visibility = [ ":*" ]
}

# TODO(b/235237667): Remove this overrides target by migrating all users to
# explicitly depend on the polyfill(s) they require.
group("overrides") {
  public_deps = [
    ":bit",
    ":span",
  ]
}

config("standard_library_public") {
  include_dirs = [ "standard_library_public" ]
}

# Provides <bit>'s std::endian.
pw_source_set("bit") {
  public_configs = [
    ":standard_library_public",
    ":bit_overrides_config",
  ]
  public_deps = [ ":standard_library" ]
  remove_public_deps = [ "*" ]
  inputs = [ "bit_public_overrides/bit" ]
  public = [ "standard_library_public/pw_polyfill/standard_library/bit.h" ]
}

# Provides <cstddef>'s std::byte.
# TODO(pwbug/603): Remove this polyfill.
pw_source_set("cstddef") {
  public_configs = [
    ":standard_library_public",
    ":cstddef_overrides_config",
  ]
  public_deps = [ ":standard_library" ]
  remove_public_deps = [ "*" ]
  inputs = [ "cstddef_public_overrides/cstddef" ]
  sources = [ "standard_library_public/pw_polyfill/standard_library/cstddef.h" ]
}

# Provides <iterator>'s std::data() and std::size().
# TODO(pwbug/603): Remove this polyfill.
pw_source_set("iterator") {
  public_configs = [
    ":standard_library_public",
    ":iterator_overrides_config",
  ]
  public_deps = [ ":standard_library" ]
  remove_public_deps = [ "*" ]
  inputs = [ "iterator_public_overrides/iterator" ]
  sources =
      [ "standard_library_public/pw_polyfill/standard_library/iterator.h" ]
}

# Provides <span>.
pw_source_set("span") {
  remove_public_deps = [ "*" ]
  public_deps = [ "$dir_pw_span:polyfill" ]
}

pw_source_set("standard_library") {
  public_configs = [ ":standard_library_public" ]
  remove_public_deps = [ "*" ]
  public =
      [ "standard_library_public/pw_polyfill/standard_library/namespace.h" ]
  visibility = [ ":*" ]
}

pw_test_group("tests") {
  tests = [ ":test" ]
  group_deps = [ "$dir_pw_span:tests" ]
}

pw_test("test") {
  deps = [ ":pw_polyfill" ]

  # Do not depend on :cstddef and :iterator since they override library headers.
  # Instead, add their include path and list them as sources.
  configs = [ ":standard_library_public" ]
  sources = [
    "standard_library_public/pw_polyfill/standard_library/cstddef.h",
    "standard_library_public/pw_polyfill/standard_library/iterator.h",
    "test.cc",
  ]
}

pw_doc_group("docs") {
  sources = [ "docs.rst" ]
}