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# Copyright 2022 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Generates cross-language JSON data from json5 files. Use this generator
# if you want to share JSON data between different languages. The generator
# will render your designate template file with the JSON content.
#
# Variables:
# sources: (mandatory)
# The json data source files.
#
# output_dir: (optional)
# The output directory for the generated files. By default it will be the
# $target_gen_dir, which is the directory where the gn task is invoked.
#
# templates: (mandatory)
# List of Jinja template files to be generated. The generated file name
# will be the template file name without the '.jinja' suffix, e.g. template
# 'abc.cc.jinja' will generate 'abc.cc'.
# template_helper: (optional)
# A python file to provide custom globals and filters for Jinja templates.
# Jinja template only supports very limited python expressions, to provide
# custom globals/filter specific to your source JSON files, you can pass a
# additional python path to this parameter, the python file you pass must
# include 2 functions: `get_custom_globals(model)` and
# `get_custom_filters(model)`, the parsed JSON model will be passed to your
# custom functions.
#
# Example:
# json_data_generator("my_json_data") {
# sources = [ "my_json_data.json5" ]
# templates = [
# "my_json_data.cc.jinja",
# "my_json_data.js.jinja",
# ]
# output_dir = "$root_gen_dir/my_dir"
# }
#
# See README.md for more information.
template("json_data_generator") {
script_file = "//tools/json_data_generator/main.py"
common_inputs = [ "//tools/json_data_generator/generator.py" ]
action(target_name) {
script = script_file
forward_variables_from(invoker,
[
"deps",
"sources",
])
assert(defined(sources), "Source json files must be defined.")
assert(defined(invoker.templates), "Template files must be defined.")
inputs = common_inputs + invoker.templates
output_dir = invoker.output_dir
if (!defined(invoker.output_dir)) {
output_dir = target_gen_dir
}
outputs = []
foreach(t, get_path_info(invoker.templates, "name")) {
outputs += [ "$output_dir/$t" ]
}
args =
[ "--templates" ] + rebase_path(invoker.templates, root_build_dir) + [
"--out-dir",
rebase_path(output_dir, root_build_dir),
"--sources",
] + rebase_path(sources, root_build_dir)
if (defined(invoker.template_helper)) {
args += [
"--template-helper",
rebase_path(invoker.template_helper, root_build_dir),
]
}
}
}
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