# Copyright 2020 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("$dir_pw_build/module_config.gni")
import("$dir_pw_build/target_types.gni")
import("$dir_pw_docgen/docs.gni")
import("$dir_pw_toolchain/traits.gni")
import("$dir_pw_unit_test/test.gni")

declare_args() {
  # Whether or not to enable bounds-checking asserts in pw::span. Enabling this
  # may significantly increase binary size, and can introduce dependency cycles
  # if your pw_assert backend's headers depends directly or indirectly on
  # pw_span. It's recommended to enable this for debug builds if possible.
  pw_span_ENABLE_ASSERTS = false

  # The build target that overrides the default configuration options for this
  # module. This should point to a source set that provides defines through a
  # public config (which may -include a file or add defines directly).
  #
  # Most modules depend on pw_build_DEFAULT_MODULE_CONFIG as the default config,
  # but since this module's config options require interaction with the build
  # system, this defaults to an internal config to properly support
  # pw_span_ENABLE_ASSERTS.
  pw_span_CONFIG = "$dir_pw_span:span_asserts"
}

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

pw_source_set("config") {
  public = [ "public/pw_span/internal/config.h" ]
  public_configs = [ ":public_include_path" ]
  public_deps = [ pw_span_CONFIG ]
  remove_public_deps = [ "*" ]
  visibility = [ ":*" ]
}

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

config("span_asserts_config") {
  defines = [ "PW_SPAN_ENABLE_ASSERTS=${pw_span_ENABLE_ASSERTS}" ]
  visibility = [ ":span_asserts" ]
}

pw_source_set("span_asserts") {
  public_configs = [ ":span_asserts_config" ]
  visibility = [ ":config" ]
}

# Provides "pw_span/span.h" and pw::span.
pw_source_set("pw_span") {
  public = [ "public/pw_span/span.h" ]
  public_deps = [ ":common" ]
}

pw_source_set("common") {
  public_configs = [ ":public_config" ]
  public_deps = [
    ":config",
    "$dir_pw_polyfill",
  ]

  # Polyfill <cstddef> (std::byte) and <iterator> (std::size(), std::data) if
  # C++17 is not supported.
  if (pw_toolchain_CXX_STANDARD < pw_toolchain_STANDARD.CXX17) {
    public_deps += [
      "$dir_pw_polyfill:cstddef",
      "$dir_pw_polyfill:iterator",
    ]
  }

  # Only add a dependency on pw_assert if the flag is explicitly enabled.
  if (pw_span_ENABLE_ASSERTS) {
    public_deps += [ "$dir_pw_assert:assert" ]
  }

  sources = [ "public/pw_span/internal/span_impl.h" ]
  visibility = [ ":*" ]
}

pw_test_group("tests") {
  tests = [
    ":pw_span_test",
    ":compatibility_test",
  ]
}

pw_test("pw_span_test") {
  deps = [ ":pw_span" ]
  remove_configs = [ "$dir_pw_build:extra_strict_warnings" ]
  sources = [ "span_test.cc" ]
}

pw_test("compatibility_test") {
  deps = [
    ":pw_span",
    dir_pw_polyfill,
  ]
  sources = [ "compatibility_test.cc" ]
}

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