openethereum/ipc/codegen/src/lib.rs
Nikolay Volf 7526b1d44b Derive IPC interface only when ipc feature is on (#2463)
* derive -> ipc

* accident repair

* conditional ipc deriving

* fix test
2016-10-05 19:42:57 +02:00

193 lines
5.8 KiB
Rust

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Codegen for IPC RPC
#![cfg_attr(feature = "nightly-testing", plugin(clippy))]
#![cfg_attr(feature = "nightly-testing", feature(plugin))]
#![cfg_attr(feature = "nightly-testing", allow(used_underscore_binding))]
#![cfg_attr(not(feature = "with-syntex"), feature(rustc_private, plugin))]
#![cfg_attr(not(feature = "with-syntex"), plugin(quasi_macros))]
extern crate aster;
extern crate quasi;
#[cfg(feature = "with-syntex")]
extern crate syntex;
#[cfg(feature = "with-syntex")]
#[macro_use]
extern crate syntex_syntax as syntax;
#[cfg(not(feature = "with-syntex"))]
#[macro_use]
extern crate syntax;
#[cfg(not(feature = "with-syntex"))]
extern crate rustc_plugin;
#[cfg(not(feature = "with-syntex"))]
use syntax::feature_gate::AttributeType;
#[cfg(feature = "with-syntex")]
include!(concat!(env!("OUT_DIR"), "/lib.rs"));
#[cfg(not(feature = "with-syntex"))]
include!("lib.rs.in");
#[cfg(feature = "with-syntex")]
pub fn expand(src: &std::path::Path, dst: &std::path::Path) {
let mut registry = syntex::Registry::new();
register(&mut registry);
registry.expand("", src, dst).unwrap();
}
#[cfg(feature = "with-syntex")]
pub fn register_cleaner(reg: &mut syntex::Registry) {
use syntax::{ast, fold};
#[cfg(feature = "with-syntex")]
fn strip_attributes(krate: ast::Crate) -> ast::Crate {
struct StripAttributeFolder;
impl fold::Folder for StripAttributeFolder {
fn fold_attribute(&mut self, attr: ast::Attribute) -> Option<ast::Attribute> {
match attr.node.value.node {
ast::MetaItemKind::List(ref n, _) if n == &"ipc" => { return None; }
ast::MetaItemKind::Word(ref n) if n == &"ipc" => { return None; }
_ => {}
}
Some(attr)
}
fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac {
fold::noop_fold_mac(mac, self)
}
}
fold::Folder::fold_crate(&mut StripAttributeFolder, krate)
}
reg.add_post_expansion_pass(strip_attributes);
}
#[cfg(feature = "with-syntex")]
pub fn register(reg: &mut syntex::Registry) {
reg.add_attr("feature(custom_derive)");
reg.add_attr("feature(custom_attribute)");
reg.add_decorator("ipc", codegen::expand_ipc_implementation);
reg.add_decorator("derive_Binary", serialization::expand_serialization_implementation);
register_cleaner(reg);
}
#[cfg(not(feature = "with-syntex"))]
pub fn register(reg: &mut rustc_plugin::Registry) {
reg.register_syntax_extension(
syntax::parse::token::intern("ipc"),
syntax::ext::base::MultiDecorator(
Box::new(codegen::expand_ipc_implementation)));
reg.register_syntax_extension(
syntax::parse::token::intern("derive_Binary"),
syntax::ext::base::MultiDecorator(
Box::new(serialization::expand_serialization_implementation)));
reg.register_attribute("ipc".to_owned(), AttributeType::Normal);
}
#[derive(Debug)]
pub enum Error { InvalidFileName, ExpandFailure, Io(std::io::Error) }
impl std::convert::From<std::io::Error> for Error {
fn from(err: std::io::Error) -> Self {
Error::Io(err)
}
}
pub fn derive_ipc_cond(src_path: &str, has_feature: bool) -> Result<(), Error> {
if has_feature { derive_ipc(src_path) }
else { cleanup_ipc(src_path) }
}
pub fn cleanup_ipc(src_path: &str) -> Result<(), Error> {
use std::env;
use std::path::{Path, PathBuf};
let out_dir = env::var_os("OUT_DIR").unwrap();
let file_name = try!(PathBuf::from(src_path).file_name().ok_or(Error::InvalidFileName).map(|val| val.to_str().unwrap().to_owned()));
let mut registry = syntex::Registry::new();
register_cleaner(&mut registry);
if let Err(_) = registry.expand("", &Path::new(src_path), &Path::new(&out_dir).join(&file_name))
{
// will be reported by compiler
return Err(Error::ExpandFailure)
}
Ok(())
}
pub fn derive_ipc(src_path: &str) -> Result<(), Error> {
use std::env;
use std::path::{Path, PathBuf};
let out_dir = env::var_os("OUT_DIR").unwrap();
let file_name = try!(PathBuf::from(src_path).file_name().ok_or(Error::InvalidFileName).map(|val| val.to_str().unwrap().to_owned()));
let final_path = Path::new(&out_dir).join(&file_name);
let mut intermediate_file_name = file_name.clone();
intermediate_file_name.push_str(".rpc.in");
let intermediate_path = Path::new(&out_dir).join(&intermediate_file_name);
{
let mut registry = syntex::Registry::new();
register(&mut registry);
if let Err(_) = registry.expand("", &Path::new(src_path), &intermediate_path) {
// will be reported by compiler
return Err(Error::ExpandFailure)
}
}
{
let mut registry = syntex::Registry::new();
register(&mut registry);
if let Err(_) = registry.expand("", &intermediate_path, &final_path) {
// will be reported by compiler
return Err(Error::ExpandFailure)
}
}
Ok(())
}
pub fn derive_binary(src_path: &str) -> Result<(), Error> {
use std::env;
use std::path::{Path, PathBuf};
let out_dir = env::var_os("OUT_DIR").unwrap();
let file_name = try!(PathBuf::from(src_path).file_name().ok_or(Error::InvalidFileName).map(|val| val.to_str().unwrap().to_owned()));
let final_path = Path::new(&out_dir).join(&file_name);
let mut registry = syntex::Registry::new();
register(&mut registry);
if let Err(_) = registry.expand("", &Path::new(src_path), &final_path) {
// will be reported by compiler
return Err(Error::ExpandFailure)
}
Ok(())
}