# Copyright 2022 Google LLC
#
# Use of this source code is governed by a ISC-License license that can be
# found in the LICENSE file.

import("../third_party.gni")

declare_args() {
  UNICODE_VERSION = "15.0.0"
}

config("c99") {
  cflags_c = []
  if (is_win) {
    cflags_c += [ "-std:c11" ]
  } else {
    cflags_c += [ "-std=c99" ]
  }
}

# Header generation only happens on the host.
# Ensure it will not be built for non-host even when implicitly building all targets.
if (current_toolchain == "//gn/toolchain:$host_toolchain") {
  copy("copy_unicode_data") {
    unicode_tools_dir =
        "../externals/unicodetools/unicodetools/data/ucd/$UNICODE_VERSION"
    sources = [
      "$unicode_tools_dir/BidiBrackets.txt",
      "$unicode_tools_dir/BidiCharacterTest.txt",
      "$unicode_tools_dir/BidiMirroring.txt",
      "$unicode_tools_dir/BidiTest.txt",
      "$unicode_tools_dir/DerivedCoreProperties.txt",
      "$unicode_tools_dir/EastAsianWidth.txt",
      "$unicode_tools_dir/LineBreak.txt",
      "$unicode_tools_dir/SpecialCasing.txt",
      "$unicode_tools_dir/UnicodeData.txt",
      "$unicode_tools_dir/auxiliary/GraphemeBreakProperty.txt",
      "$unicode_tools_dir/auxiliary/GraphemeBreakTest.txt",
      "$unicode_tools_dir/auxiliary/LineBreakTest.txt",
      "$unicode_tools_dir/auxiliary/SentenceBreakProperty.txt",
      "$unicode_tools_dir/auxiliary/SentenceBreakTest.txt",
      "$unicode_tools_dir/auxiliary/WordBreakProperty.txt",
      "$unicode_tools_dir/auxiliary/WordBreakTest.txt",
      "$unicode_tools_dir/emoji/emoji-data.txt",
      "$unicode_tools_dir/extracted/DerivedBidiClass.txt",
    ]
    outputs =
        [ "$root_gen_dir/third_party/libgrapheme/data/{{source_file_part}}" ]
  }

  template("compile_tool") {
    executable(target_name) {
      forward_variables_from(invoker, "*", [ "deps" ])
      if (defined(invoker.deps)) {
        deps += invoker.deps
      }
      configs += [ ":c99" ]
      sources += [ "../externals/libgrapheme/gen/util.c" ]
    }
  }

  compile_tool("bidirectional") {
    sources = [ "../externals/libgrapheme/gen/bidirectional.c" ]
  }

  compile_tool("case") {
    sources = [ "../externals/libgrapheme/gen/case.c" ]
  }

  compile_tool("character") {
    sources = [ "../externals/libgrapheme/gen/character.c" ]
  }

  compile_tool("line") {
    sources = [ "../externals/libgrapheme/gen/line.c" ]
  }

  compile_tool("sentence") {
    sources = [ "../externals/libgrapheme/gen/sentence.c" ]
  }

  compile_tool("word") {
    sources = [ "../externals/libgrapheme/gen/word.c" ]
  }

  # Run an executable that will produce a header
  action_foreach("generate_headers") {
    script = "generate_headers.py"
    cmd_dir = rebase_path(root_out_dir)
    args = [
      "$cmd_dir/{{source_name_part}}",
      rebase_path(
          "$root_gen_dir/third_party/libgrapheme/gen/{{source_name_part}}.h",
          root_build_dir),
      rebase_path("$root_gen_dir/third_party/libgrapheme", root_build_dir),
    ]
    _src = "../externals/libgrapheme/gen"
    sources = [
      "$_src/bidirectional.c",
      "$_src/case.c",
      "$_src/character.c",
      "$_src/line.c",
      "$_src/sentence.c",
      "$_src/word.c",
    ]
    outputs =
        [ "$root_gen_dir/third_party/libgrapheme/gen/{{source_name_part}}.h" ]
    deps = [
      ":bidirectional",
      ":case",
      ":character",
      ":copy_unicode_data",
      ":line",
      ":sentence",
      ":word",
    ]
  }
}

# libgrapheme is built for the target and so must be able to always see headers and headers_config.
config("headers_config") {
  if (current_toolchain == "//gn/toolchain:$host_toolchain") {
    include_dirs = [ "$root_gen_dir/third_party/libgrapheme/gen" ]
  }
}

source_set("headers") {
  if (current_toolchain == "//gn/toolchain:$host_toolchain") {
    # Prevent :generate_headers from being run when building all targets.
    sources = get_target_outputs(":generate_headers")

    #get_target_outputs does not actually depend on the outputs
    deps = [ ":generate_headers" ]
  }
}

third_party("libgrapheme") {
  public_include_dirs = [ "../externals/libgrapheme" ]
  _src = "../externals/libgrapheme/src"

  configs = [
    ":c99",
    ":headers_config(//gn/toolchain:$host_toolchain)",
  ]

  sources = [
    "$_src/bidirectional.c",
    "$_src/case.c",
    "$_src/character.c",
    "$_src/line.c",
    "$_src/sentence.c",
    "$_src/utf8.c",
    "$_src/util.c",
    "$_src/word.c",
  ]

  deps = [ ":headers(//gn/toolchain:$host_toolchain)" ]
}