1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
//! Wayland scanner crate
//!
//!
//! This crate is a rust equivalent of the wayland-scanner tool from the
//! official wayland C library.
//!
//! You can use in your build script to generate the rust code for any
//! wayland protocol file, to use alongside the `wayland_client` and
//! `wayland_server` crate to build your applications.
//!
//! ## How to use this crate
//!
//! This crate is to be used in a build script. It provides you two
//! functions, `generate_code` and `generate_interfaces`. They'll
//! allow you to generate the code to use with the `wayland_client` or
//! `wayland_server` crates for any XML wayland protocol file (NB: you don't
//! need to do it for the core protocol, which is already included in both crates).
//!
//! First, have the XML files you want to use in your project, somewhere the build script
//! will be able to read them.
//!
//! Then, you'll need to invoke both `generate_interfaces` *and* `generate_code` for
//! each of these files.
//!
//! A sample build script:
//!
//! ```no_run
//! extern crate wayland_scanner;
//!
//! use std::env::var;
//! use std::path::Path;
//!
//! use wayland_scanner::{Side, generate_code, generate_interfaces};
//!
//! fn main() {
//!     // Location of the xml file, relative to the `Cargo.toml`
//!     let protocol_file = "./my_protocol.xml";
//!
//!     // Target directory for the generate files
//!     let out_dir_str = var("OUT_DIR").unwrap();
//!     let out_dir = Path::new(&out_dir_str);
//!
//!     generate_code(
//!         protocol_file,
//!         out_dir.join("my_protocol_api.rs"),
//!         Side::Client, // Replace by `Side::Server` for server-side code
//!     );
//!
//!     // interfaces are the same for client and server
//!     generate_interfaces(
//!         protocol_file,
//!         out_dir.join("my_protocol_interfaces.rs")
//!     );
//! }
//! ```
//!
//! The above example will output two `.rs` files in the `OUT_DIR` defined by
//! cargo. Then, you'll need to include these two generated files (using the
//! macro of the same name) to make this code available in your crate.
//!
//! ```ignore
//! // The generated code will import stuff from wayland_sys
//! extern crate wayland_sys;
//! extern crate wayland_client;
//!
//! // Re-export only the actual code, and then only use this re-export
//! // The `generated` module below is just some boilerplate to properly isolate stuff
//! // and avoid exposing internal details.
//! //
//! // You can use all the types from my_procol as if they went from `wayland_client::protocol`.
//! pub use generated::client as my_protocol;
//!
//! mod generated {
//!     // The generated code tends to trigger a lot of warnings
//!     // so we isole it into a very permissive module
//!     #![allow(dead_code,non_camel_case_types,unused_unsafe,unused_variables)]
//!     #![allow(non_upper_case_globals,non_snake_case,unused_imports)]
//!
//!     pub mod interfaces {
//!         // include the interfaces, they just need to be accessible to the generated code
//!         // so this module is `pub` so that it can be imported by the other one.
//!         include!(concat!(env!("OUT_DIR"), "/my_protocol_interfaces.rs"));
//!     }
//!
//!     pub mod client {
//!         // These import are mandatory, and need to by `pub`, because
//!         // submodules in the generated code will try to import them.
//!         // Hopefully someday pub(restricted) and friends will
//!         // allow for a cleaner way to do that
//!         #[doc(hidden)] pub use wayland_client::{Proxy, Handler, EventQueueHandle, RequestResult};
//!         // Replace the above line with this for server-side:
//!         // #[doc(hidden)] pub use wayland_server::{Resource, Handler, EventLoopHandle, EventResult};
//!         #[doc(hidden)] pub use super::interfaces;
//!         // If you protocol interacts with objects from other protocols, you'll need to import
//!         // their modules, like so:
//!         #[doc(hidden)] pub use wayland_client::protocol::{wl_surface, wl_region};
//!         include!(concat!(env!("OUT_DIR"), "/my_protocol_code.rs"));
//!     }
//! }
//! ```

#![warn(missing_docs)]

extern crate xml;

use std::fs::{File, OpenOptions};
use std::path::Path;

mod util;
mod parse;
mod protocol;
mod side;
mod interface_gen;
mod code_gen;

pub use side::Side;

fn load_xml<P: AsRef<Path>>(prot: P) -> protocol::Protocol {
    let pfile = File::open(prot).unwrap();
    parse::parse_stream(pfile)
}

/// Generate the interfaces for a protocol
///
/// See this crate toplevel documentation for details.
///
/// Args:
///
/// - `protocol`: a path to the XML file describing the protocol, absolute or relative to
///   the build script using this function.
/// - `target`: the path of the file to store this interfaces in.
pub fn generate_interfaces<P1: AsRef<Path>, P2: AsRef<Path>>(protocol: P1, target: P2) {
    let protocol = load_xml(protocol);
    let mut out = OpenOptions::new().write(true).truncate(true).create(true).open(target).unwrap();
    interface_gen::generate_interfaces(protocol, &mut out);
}

/// Generate the code for a protocol
///
/// See this crate toplevel documentation for details.
///
/// Args:
///
/// - `protocol`: a path to the XML file describing the protocol, absolute or relative to
///   the build script using this function.
/// - `target`: the path of the file to store the code in.
/// - `side`: the side (client or server) to generate code for.
pub fn generate_code<P1: AsRef<Path>, P2: AsRef<Path>>(prot: P1, target: P2, side: Side) {
    let protocol = load_xml(prot);
    let mut out = OpenOptions::new().write(true).truncate(true).create(true).open(target).unwrap();
    code_gen::write_protocol(protocol, &mut out, side).unwrap()
}