common-mk/flex_parser_generator.gni

# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# GN template to generate static library for the given yacc files.
# How to use:
# [platform2/pkg/BUILD.gn]
# generate_flex_parser("foo_flex_parser") {
#   out_dir = "${platform2_root}"
#   sources = [
#     "foo.ll",
#     "bar.ll",
#   ]
# }
#
# Then this generates the binding source code under ${root_gen_dir},.
# E.g. ${root_gen_dir}/${out_dir}/foo.cc, ${root_gen_dir}/${out_dir}/bar.cc etc.
#
# Parameters:
#   out_dir
#       The output source code and headers' path.
#   sources
#       The .ll / .l file paths.
#

template("generate_flex_parser") {
  h_dir = "${root_gen_dir}/" + invoker.out_dir

  action_foreach(target_name) {
    sources = invoker.sources
    script = "//common-mk/file_generator_wrapper.py"
    outputs = [ "${h_dir}/{{source_name_part}}.cc" ]
    args = [
      "flex",
      "-o",
      "${h_dir}/{{source_name_part}}.cc",
      "{{source}}",
    ]
  }
}