homebrew-core/Formula/v8.rb

class V8 < Formula
  desc "Google's JavaScript engine"
  homepage "https://github.com/v8/v8/wiki"
  # Track V8 version from Chrome stable: https://omahaproxy.appspot.com
  url "https://github.com/v8/v8/archive/8.8.278.17.tar.gz"
  sha256 "58f9fb29a330a30964a978af1cc02c0bf73bff8123b437d87111c9ce9587852a"
  license "BSD-3-Clause"

  livecheck do
    url "https://omahaproxy.appspot.com/all.json?os=mac&channel=stable"
    regex(/"v8_version": "v?(\d+(?:\.\d+)+)"/i)
  end

  bottle do
    sha256 cellar: :any, arm64_big_sur: "f6c2b9e090e92d4e9eef6b135995bf252b14d98d124ab55939f28ff2fa26e6a9"
    sha256 cellar: :any, big_sur:       "e885780347352e0a98fe30c5621030ab58b482faa0c04be9c6c04b9fc7b37c50"
    sha256 cellar: :any, catalina:      "3d37fb2a28072ebf8512d0f97211e7b17d0608b147be946047148a3430cdfd45"
    sha256 cellar: :any, mojave:        "551645e919115dcaf480727992dd3c9bad9e73a71e4f5e62f750fb0d5586366a"
  end

  depends_on "llvm" => :build
  depends_on "ninja" => :build

  depends_on xcode: ["10.0", :build] # required by v8

  # Look up the correct resource revisions in the DEP file of the specific releases tag
  # e.g. for CIPD dependency gn: https://github.com/v8/v8/blob/8.8.278.17/DEPS#L53
  resource "gn" do
    url "https://gn.googlesource.com/gn.git",
        revision: "53d92014bf94c3893886470a1c7c1289f8818db0"
  end

  # e.g.: https://github.com/v8/v8/blob/8.8.278.17/DEPS#L94 for the revision of build for v8 8.8.278.17
  resource "v8/build" do
    url "https://chromium.googlesource.com/chromium/src/build.git",
        revision: "2101eff1ac4bfd25f2dfa71ad632a600a38c1ed9"
  end

  resource "v8/third_party/icu" do
    url "https://chromium.googlesource.com/chromium/deps/icu.git",
        revision: "c2a4cae149aae7fd30c4cbe3cf1b30df03b386f1"
  end

  resource "v8/base/trace_event/common" do
    url "https://chromium.googlesource.com/chromium/src/base/trace_event/common.git",
        revision: "eb94f1c7aa96207f469008f29989a43feb2718f8"
  end

  resource "v8/third_party/googletest/src" do
    url "https://chromium.googlesource.com/external/github.com/google/googletest.git",
        revision: "4fe018038f87675c083d0cfb6a6b57c274fb1753"
  end

  resource "v8/third_party/jinja2" do
    url "https://chromium.googlesource.com/chromium/src/third_party/jinja2.git",
        revision: "a82a4944a7f2496639f34a89c9923be5908b80aa"
  end

  resource "v8/third_party/markupsafe" do
    url "https://chromium.googlesource.com/chromium/src/third_party/markupsafe.git",
        revision: "0944e71f4b2cb9a871bcbe353f95e889b64a611a"
  end

  resource "v8/third_party/zlib" do
    url "https://chromium.googlesource.com/chromium/src/third_party/zlib.git",
        revision: "e84c9a3fd75fdc39055b7ae27d6ec508e50bd39e"
  end

  def install
    (buildpath/"build").install resource("v8/build")
    (buildpath/"third_party/jinja2").install resource("v8/third_party/jinja2")
    (buildpath/"third_party/markupsafe").install resource("v8/third_party/markupsafe")
    (buildpath/"third_party/googletest/src").install resource("v8/third_party/googletest/src")
    (buildpath/"base/trace_event/common").install resource("v8/base/trace_event/common")
    (buildpath/"third_party/icu").install resource("v8/third_party/icu")
    (buildpath/"third_party/zlib").install resource("v8/third_party/zlib")

    # Build gn from source and add it to the PATH
    (buildpath/"gn").install resource("gn")
    cd "gn" do
      system "python", "build/gen.py"
      system "ninja", "-C", "out/", "gn"
    end
    ENV.prepend_path "PATH", buildpath/"gn/out"

    # create gclient_args.gni
    (buildpath/"build/config/gclient_args.gni").write <<~EOS
      declare_args() {
        checkout_google_benchmark = false
      }
    EOS

    # setup gn args
    gn_args = {
      is_debug:                     false,
      is_component_build:           true,
      v8_use_external_startup_data: false,
      v8_enable_i18n_support:       true, # enables i18n support with icu
      clang_base_path:              "\"#{Formula["llvm"].opt_prefix}\"", # uses Homebrew clang instead of Google clang
      clang_use_chrome_plugins:     false, # disable the usage of Google's custom clang plugins
      use_custom_libcxx:            false, # uses system libc++ instead of Google's custom one
      treat_warnings_as_errors:     false, # ignore not yet supported clang argument warnings
    }

    # use clang from homebrew llvm formula, because the system clang is unreliable
    ENV.remove "HOMEBREW_LIBRARY_PATHS", Formula["llvm"].opt_lib # but link against system libc++

    # Transform to args string
    gn_args_string = gn_args.map { |k, v| "#{k}=#{v}" }.join(" ")

    # Build with gn + ninja
    system "gn", "gen", "--args=#{gn_args_string}", "out.gn"
    system "ninja", "-j", ENV.make_jobs, "-C", "out.gn", "-v", "d8"

    # Install all the things
    (libexec/"include").install Dir["include/*"]
    libexec.install Dir["out.gn/lib*.dylib", "out.gn/d8", "out.gn/icudtl.dat"]
    bin.write_exec_script libexec/"d8"
  end

  test do
    assert_equal "Hello World!", shell_output("#{bin}/d8 -e 'print(\"Hello World!\");'").chomp
    t = "#{bin}/d8 -e 'print(new Intl.DateTimeFormat(\"en-US\").format(new Date(\"2012-12-20T03:00:00\")));'"
    assert_match %r{12/\d{2}/2012}, shell_output(t).chomp

    (testpath/"test.cpp").write <<~EOS
      #include <libplatform/libplatform.h>
      #include <v8.h>
      int main(){
        static std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();
        v8::V8::InitializePlatform(platform.get());
        v8::V8::Initialize();
        return 0;
      }
    EOS

    # link against installed libc++
    system ENV.cxx, "-std=c++14", "test.cpp",
      "-I#{libexec}/include",
      "-L#{libexec}", "-lv8", "-lv8_libplatform"
  end
end