add CatSearcher
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@ -12,3 +12,7 @@ description = "Require Lua modules by name"
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[dependencies]
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rlua = "0.18"
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[dependencies.io-cat]
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git = "https://git.sr.ht/~ioiojo/io-cat"
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rev = "e08a8b9776f36a9e8e015d7c9802dbf758187fe2"
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@ -5,7 +5,7 @@ use std::fs::File;
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use std::io::Read;
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use std::path::{Path, PathBuf};
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use crate::types::Result;
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use crate::types::{CatMap, Result};
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/// Stores Lua modules indexed by module name, and provides an `rlua::MetaMethod` to
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/// enable `require`ing the stored modules by name in an `rlua::Context`.
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@ -118,7 +118,7 @@ where
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/// `rlua::Context` with Rust code.
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///
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/// Enables exposing `UserData` types to an `rlua::Context`.
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pub struct ClosureSearcher {
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struct ClosureSearcher {
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/// Closures must accept three parameters:
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///
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/// 1. An `rlua::Context`, which the closure can do what it wants with.
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@ -142,7 +142,7 @@ pub struct ClosureSearcher {
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}
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impl ClosureSearcher {
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pub fn new(
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fn new(
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modules: HashMap<
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Cow<'static, str>,
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Box<
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@ -182,7 +182,7 @@ impl UserData for ClosureSearcher {
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/// up an `rlua::Context` with Rust code.
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///
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/// Enables exposing `UserData` types to an `rlua::Context`.
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pub struct FunctionSearcher {
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struct FunctionSearcher {
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/// Functions must accept three parameters:
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///
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/// 1. An `rlua::Context`, which the function body can do what it wants with.
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@ -203,7 +203,7 @@ pub struct FunctionSearcher {
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}
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impl FunctionSearcher {
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pub fn new(
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fn new(
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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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@ -236,6 +236,45 @@ impl UserData for FunctionSearcher {
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}
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}
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/// Like `Searcher`, but with `CatMap` to facilitate indexing heterogenous strings and paths -
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/// all presumed to resolve to Lua module content - by module names in `modules`.
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struct CatSearcher {
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modules: CatMap,
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globals: RegistryKey,
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}
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impl CatSearcher {
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fn new(modules: CatMap, globals: RegistryKey) -> Self {
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Self { modules, globals }
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}
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}
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impl UserData for CatSearcher {
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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_meta_method(MetaMethod::Call, |lua_ctx, this, name: String| {
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let name = Cow::from(name);
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match this.modules.get(&name) {
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Some(content) => {
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let content = content
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.cat()
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.map_err(|e| rlua::Error::RuntimeError(format!("io error: {}", e)))?;
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Ok(Value::Function(
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lua_ctx
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.load(&content)
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.set_name(name.as_ref())?
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.set_environment(lua_ctx.registry_value::<Table>(&this.globals)?)?
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.into_function()?,
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))
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}
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None => Ok(Value::Nil),
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}
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});
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}
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}
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/// Extend `rlua::Context` to support `require`ing Lua modules by name.
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pub trait AddSearcher {
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/// Add a `HashMap` of Lua modules indexed by module name to Lua's `package.searchers`
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@ -279,6 +318,10 @@ pub trait AddSearcher {
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for<'ctx> fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>,
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>,
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) -> Result<()>;
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/// Like `add_searcher`, except `modules` can contain heterogenous strings and paths
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/// indexed by module name.
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fn add_cat_searcher(&self, modules: CatMap) -> Result<()>;
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}
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impl<'a> AddSearcher for Context<'a> {
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@ -358,4 +401,14 @@ impl<'a> AddSearcher for Context<'a> {
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.set(searchers.len()? + 1, searcher)
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.map_err(|e| e.into())
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}
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fn add_cat_searcher(&self, modules: CatMap) -> Result<()> {
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let globals = self.globals();
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let searchers: Table = globals.get::<_, Table>("package")?.get("searchers")?;
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let registry_key = self.create_registry_value(globals)?;
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let searcher = CatSearcher::new(modules, registry_key);
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searchers
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.set(searchers.len()? + 1, searcher)
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.map_err(|e| e.into())
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}
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}
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@ -1,3 +1,6 @@
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use crate::error::Error;
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use std::borrow::Cow;
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use std::result;
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pub type Result<A> = std::result::Result<A, Error>;
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pub(crate) type CatMap = io_cat::CatMap<Cow<'static, str>>;
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pub type Result<A> = result::Result<A, Error>;
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@ -1,3 +1,4 @@
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use io_cat::CatMap;
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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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@ -330,3 +331,35 @@ fn cartridge_loader<'ctx>(
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.set_environment(env)?
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.into_function()?)
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}
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#[test]
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fn add_cat_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: CatMap<Cow<'static, str>> = CatMap::new();
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map.insert(name, Box::new(path));
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map.insert(Cow::from("loon"), Box::new(r#"return "hello loon""#));
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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_cat_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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let hello = lua
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.context::<_, Result<String>>(|lua_ctx| {
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Ok(lua_ctx.load(r#"return require("loon")"#).eval()?)
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})
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.unwrap();
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assert_eq!("hello loon", hello);
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}
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