# Copyright 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Generates the FeatureProviders files for extension features files.
# The following variables are required:
#   sources: The features.json files to use.
#   feature_class: The name of the feature class to generate, e.g. APIFeature.
#   provider_class: The name of the provider class to generate, e.g.
#                   APIFeatureProvider.
template("json_features") {
  assert(defined(invoker.sources),
         "\"sources\" must be defined for the $target_name template.")
  assert(defined(invoker.feature_class),
         "\"feature_class\" must be defined for the $target_name template.")
  assert(defined(invoker.provider_class),
         "\"provider_class\" must be defined for the $target_name template.")
  feature_class = invoker.feature_class
  provider_class = invoker.provider_class

  compiler_root = "//tools/json_schema_compiler"
  base_filename = target_name
  action_name = "${target_name}_json_features"
  generated_files = [
    "$target_gen_dir/$base_filename.cc",
    "$target_gen_dir/$base_filename.h",
  ]

  action(action_name) {
    sources = invoker.sources
    script = "$compiler_root/feature_compiler.py"
    inputs = [
      "$compiler_root/code.py",
      "$compiler_root/json_parse.py",
    ]
    outputs = generated_files
    rebased = rebase_path(sources, root_build_dir)
    args = [
             ".",
             "$feature_class",
             "$provider_class",
             rebase_path(target_gen_dir, root_build_dir),
             "$base_filename",
           ] + rebased
  }

  source_set(target_name) {
    sources = generated_files
    public_deps = [
      ":$action_name",
    ]
  }
}