Add lua emscripten support (mlua-rs#338)

Author: bytedream

Cargo.toml

@@ -60,20 +60,26 @@ ffi = { package = "mlua-sys", version = "0.4.0", path = "mlua-sys" }
 [target.'cfg(unix)'.dependencies]
 libloading = { version = "0.8", optional = true }
 
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+ffi = { package = "mlua-sys", version = "0.4.0", path = "mlua-sys", features = ["vendored"] }
+
 [dev-dependencies]
-rustyline = "12.0"
-criterion = { version = "0.5", features = ["async_tokio"] }
 trybuild = "1.0"
 futures = "0.3.5"
 hyper = { version = "0.14", features = ["client", "server"] }
 reqwest = { version = "0.11", features = ["json"] }
-tokio = { version = "1.0", features = ["full"] }
+tokio = { version = "1.0", features = ["macros", "rt", "time"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 maplit = "1.0"
 tempfile = "3"
 static_assertions = "1.0"
 
+[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
+criterion = { version = "0.5", features = ["async_tokio"] }
+rustyline = "12.0"
+tokio = { version = "1.0", features = ["full"] }
+
 [[bench]]
 name = "benchmark"
 harness = false

examples/async_http_client.rs

@@ -1,3 +1,6 @@
+#[cfg(target_arch = "wasm32")]
+compile_error!("Not available for wasm");
+
 use std::collections::HashMap;
 
 use hyper::body::{Body as HyperBody, HttpBody as _};

examples/async_http_reqwest.rs

@@ -1,6 +1,6 @@
 use mlua::{chunk, ExternalResult, Lua, LuaSerdeExt, Result};
 
-#[tokio::main]
+#[tokio::main(flavor = "current_thread")]
 async fn main() -> Result<()> {
     let lua = Lua::new();
 

examples/async_http_server.rs

@@ -1,3 +1,6 @@
+#[cfg(target_arch = "wasm32")]
+compile_error!("Not available for wasm");
+
 use std::future::Future;
 use std::net::SocketAddr;
 use std::pin::Pin;

examples/async_tcp_server.rs

@@ -1,3 +1,6 @@
+#[cfg(target_arch = "wasm32")]
+compile_error!("Not available for wasm");
+
 use std::io;
 use std::net::SocketAddr;
 use std::rc::Rc;

examples/repl.rs

@@ -1,4 +1,6 @@
 //! This example shows a simple read-evaluate-print-loop (REPL).
+#[cfg(target_arch = "wasm32")]
+compile_error!("Not available for wasm");
 
 use mlua::{Error, Lua, MultiValue};
 use rustyline::DefaultEditor;

mlua-sys/src/lua51/lauxlib.rs

@@ -43,7 +43,7 @@ extern "C-unwind" {
     pub fn luaL_checkudata(L: *mut lua_State, ud: c_int, tname: *const c_char) -> *mut c_void;
 
     pub fn luaL_where(L: *mut lua_State, lvl: c_int);
-    pub fn luaL_error(L: *mut lua_State, fmt: *const c_char, ...) -> !;
+    pub fn luaL_error(L: *mut lua_State, fmt: *const c_char, ...) -> c_int;
 
     pub fn luaL_checkoption(
         L: *mut lua_State,

mlua-sys/src/lua52/lauxlib.rs

@@ -49,7 +49,7 @@ extern "C-unwind" {
     pub fn luaL_checkudata(L: *mut lua_State, ud: c_int, tname: *const c_char) -> *mut c_void;
 
     pub fn luaL_where(L: *mut lua_State, lvl: c_int);
-    pub fn luaL_error(L: *mut lua_State, fmt: *const c_char, ...) -> !;
+    pub fn luaL_error(L: *mut lua_State, fmt: *const c_char, ...) -> c_int;
 
     pub fn luaL_checkoption(
         L: *mut lua_State,

tests/chunk.rs

@@ -1,9 +1,12 @@
+#![allow(unused_imports)]
+
 use std::fs;
 use std::io;
 
 use mlua::{Lua, Result};
 
 #[test]
+#[cfg(not(target_arch = "wasm32"))]
 fn test_chunk_path() -> Result<()> {
     let lua = Lua::new();