333 lines
9.2 KiB
Rust
333 lines
9.2 KiB
Rust
use rlua::{Context, Function, Lua, Table, UserData, UserDataMethods, Value};
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use rlua_searcher::{AddSearcher, Result};
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use std::borrow::Cow;
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use std::collections::HashMap;
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use std::fs::File;
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use std::io::Write;
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use std::path::PathBuf;
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#[test]
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fn add_searcher_works() {
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// These should end up in the same hash slot.
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let name_owned = Cow::from("lume".to_string());
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let name_ref = Cow::from("lume");
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// `lume_ref` should overwrite `lume_owned`.
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let lume_owned = Cow::from(read_lume_to_string());
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let lume_ref = Cow::from(read_lume_to_str());
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let mut map = HashMap::new();
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map.insert(name_owned, lume_owned);
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map.insert(name_ref, lume_ref);
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let lua = Lua::new();
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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lua_ctx.add_searcher(map)?;
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello ref", hello);
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// Repeat the experiment, but with an additional overwrite.
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let name_owned = Cow::from("lume".to_string());
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let name_ref = Cow::from("lume");
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let lume_owned = Cow::from(read_lume_to_string());
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let lume_ref = Cow::from(read_lume_to_str());
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let mut map = HashMap::new();
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map.insert(name_owned, lume_owned);
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map.insert(name_ref, lume_ref);
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let name_owned = Cow::from("lume".to_string());
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let lume_owned = Cow::from(read_lume_to_string());
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map.insert(name_owned, lume_owned);
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let lua = Lua::new();
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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lua_ctx.add_searcher(map)?;
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello owned", hello);
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}
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#[test]
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fn add_path_searcher_works() {
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let name = Cow::from("lume".to_string());
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let path = PathBuf::new()
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.join(std::env::var("CARGO_MANIFEST_DIR").unwrap())
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.join("tests")
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.join("data")
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.join("lume.lua");
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let mut map = HashMap::new();
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map.insert(name, path);
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let lua = Lua::new();
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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lua_ctx.add_path_searcher(map)?;
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello lume", hello);
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}
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#[test]
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fn module_reloading_works() {
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let name = Cow::from("lume".to_string());
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let path = PathBuf::new()
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.join(std::env::var("CARGO_MANIFEST_DIR").unwrap())
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.join("tests")
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.join("data")
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.join("lume.lua");
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let mut map = HashMap::new();
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map.insert(name.clone(), path.clone());
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let lua = Lua::new();
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// Add searcher for lume module on disk, and read from it.
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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lua_ctx.add_path_searcher(map)?;
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello lume", hello);
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// Twice.
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello lume", hello);
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// Modify lume module on disk.
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let mut out = File::create(path.clone()).expect("Could not create Lume module on disk");
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write!(out, "{}\n", r#"return "hello again lume""#)
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.expect("Could not modify Lume module on disk");
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// Thrice. Should still be unchanged due to caching.
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello lume", hello);
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// Remove lume module from Lua’s `package.loaded` cache to facilitate reload.
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lua.context::<_, rlua::Result<()>>(|lua_ctx| {
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let globals = lua_ctx.globals();
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let loaded: Table = globals.get::<_, Table>("package")?.get("loaded")?;
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loaded.set(name.as_ref(), Value::Nil)
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})
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.unwrap();
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// Re-read from lume module on disk.
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello again lume", hello);
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// Twice.
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello again lume", hello);
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// Revert changes to lume module on disk.
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let mut out = File::create(path).expect("Could not create Lume module on disk");
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write!(out, "{}\n", r#"return "hello lume""#).expect("Could not modify Lume module on disk");
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// Clear cache again.
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lua.context::<_, rlua::Result<()>>(|lua_ctx| {
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let globals = lua_ctx.globals();
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let loaded: Table = globals.get::<_, Table>("package")?.get("loaded")?;
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loaded.set(name.as_ref(), Value::Nil)
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})
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.unwrap();
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// Ensure changes have been successfully reverted.
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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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Ok(lua_ctx.load(r#"return require("lume")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello lume", hello);
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}
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fn read_lume_to_string() -> String {
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r#"return "hello owned""#.to_string()
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}
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fn read_lume_to_str() -> &'static str {
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r#"return "hello ref""#
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}
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#[test]
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fn add_closure_searcher_works() {
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let lua = Lua::new();
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let mut modules: HashMap<
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Cow<'static, str>,
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Box<
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dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>
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+ Send,
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>,
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> = HashMap::new();
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let instrument_loader: Box<
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dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>> + Send,
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> = Box::new(|lua_ctx, env, name| {
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let globals = lua_ctx.globals();
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let new = lua_ctx.create_function(|_, (name, sound): (String, String)| {
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Ok(Instrument::new(name, sound))
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})?;
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let tbl = lua_ctx.create_table()?;
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tbl.set("new", new)?;
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globals.set("instrument", tbl)?;
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Ok(lua_ctx
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.load("return instrument")
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.set_name(name)?
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.set_environment(env)?
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.into_function()?)
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});
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modules.insert(Cow::from("instrument".to_string()), instrument_loader);
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let sound = lua
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.context::<_, Result<String>>(|lua_ctx| {
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lua_ctx.add_closure_searcher(modules)?;
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// Ensure global variable `instrument` is unset.
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let nil: String = lua_ctx.load("return type(instrument)").eval()?;
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assert_eq!(nil, "nil");
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Ok(lua_ctx
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.load(
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r#"local instrument = require("instrument")
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local ukulele = instrument.new("ukulele", "twang")
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return ukulele:play()"#,
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)
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.eval()?)
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})
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.unwrap();
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assert_eq!(sound, "The ukulele goes twang");
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}
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struct Instrument {
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name: String,
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sound: String,
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}
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impl Instrument {
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pub fn new(name: String, sound: String) -> Self {
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Self { name, sound }
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}
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pub fn play(&self) -> String {
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format!("The {} goes {}", self.name, self.sound)
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}
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}
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impl UserData for Instrument {
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fn add_methods<'lua, M>(methods: &mut M)
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where
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M: UserDataMethods<'lua, Self>,
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{
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methods.add_method("play", |_, instrument, ()| Ok(instrument.play()));
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}
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}
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#[test]
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fn add_function_searcher_works() {
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let lua = Lua::new();
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let mut modules: HashMap<
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Cow<'static, str>,
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for<'ctx> fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>,
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> = HashMap::new();
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modules.insert(Cow::from("cartridge".to_string()), cartridge_loader);
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let title = lua
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.context::<_, Result<String>>(|lua_ctx| {
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lua_ctx.add_function_searcher(modules)?;
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// Ensure global variable `cartridge` is unset.
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let nil: String = lua_ctx.load("return type(cartridge)").eval()?;
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assert_eq!(nil, "nil");
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Ok(lua_ctx
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.load(
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r#"local cartridge = require("cartridge")
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local smash = cartridge.pick()
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return smash:play()"#,
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)
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.eval()?)
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})
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.unwrap();
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assert_eq!(title, "Super Smash Brothers 64");
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}
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struct Cartridge {
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title: String,
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}
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impl Cartridge {
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pub fn pick() -> Self {
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let title = "Super Smash Brothers 64".to_string();
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Self { title }
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}
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pub fn play(&self) -> String {
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self.title.clone()
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}
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}
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impl UserData for Cartridge {
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fn add_methods<'lua, M>(methods: &mut M)
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where
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M: UserDataMethods<'lua, Self>,
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{
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methods.add_method("play", |_, cartridge, ()| Ok(cartridge.play()));
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}
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}
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fn cartridge_loader<'ctx>(
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lua_ctx: Context<'ctx>,
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env: Table<'ctx>,
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name: &str,
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) -> rlua::Result<Function<'ctx>> {
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let globals = lua_ctx.globals();
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let pick = lua_ctx.create_function(|_, ()| Ok(Cartridge::pick()))?;
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let tbl = lua_ctx.create_table()?;
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tbl.set("pick", pick)?;
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globals.set("cartridge", tbl)?;
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Ok(lua_ctx
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.load("return cartridge")
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.set_name(name)?
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.set_environment(env)?
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.into_function()?)
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}
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