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// Copyright 2022 Google, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::{Path, PathBuf};
fn main() {
install_generated_module(
"lmp_packets.rs",
"LMP_PACKETS_PREBUILT",
&PathBuf::from("lmp_packets.pdl").canonicalize().unwrap(),
);
install_generated_module(
"llcp_packets.rs",
"LLCP_PACKETS_PREBUILT",
&PathBuf::from("llcp_packets.pdl").canonicalize().unwrap(),
);
install_generated_module(
"hci_packets.rs",
"HCI_PACKETS_PREBUILT",
&PathBuf::from("../packets/hci_packets.pdl").canonicalize().unwrap(),
);
}
fn install_generated_module(module_name: &str, prebuilt_var: &str, pdl_name: &PathBuf) {
let module_prebuilt = match env::var(prebuilt_var) {
Ok(dir) => PathBuf::from(dir),
Err(_) => PathBuf::from(module_name),
};
if Path::new(module_prebuilt.as_os_str()).exists() {
let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
std::fs::copy(
module_prebuilt.as_os_str().to_str().unwrap(),
out_dir.join(module_name).as_os_str().to_str().unwrap(),
)
.unwrap();
} else {
generate_module(pdl_name);
}
}
fn generate_module(in_file: &Path) {
let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
let mut out_file =
File::create(out_dir.join(in_file.file_name().unwrap()).with_extension("rs")).unwrap();
println!("cargo:rerun-if-changed={}", in_file.display());
let mut sources = pdl_compiler::ast::SourceDatabase::new();
let parsed_file = pdl_compiler::parser::parse_file(
&mut sources,
in_file.to_str().expect("Filename is not UTF-8"),
)
.expect("PDL parse failed");
let analyzed_file = pdl_compiler::analyzer::analyze(&parsed_file).expect("PDL analysis failed");
let rust_source = pdl_compiler::backends::rust_legacy::generate(&sources, &analyzed_file);
out_file.write_all(rust_source.as_bytes()).expect("Could not write to output file");
}
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