mlua 0.8.10

High level bindings to Lua 5.4/5.3/5.2/5.1 (including LuaJIT) and Roblox Luau with async/await features and support of writing native Lua modules in Rust.
Documentation 
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
153
154
155
156

//! Contains definitions from `lualib.h`.

use std::os::raw::{c_char, c_float, c_int, c_void};
use std::ptr;

use super::lua::{
    self, lua_CFunction, lua_Integer, lua_Number, lua_State, lua_Unsigned, LUA_REGISTRYINDEX,
};

#[repr(C)]
pub struct luaL_Reg {
    pub name: *const c_char,
    pub func: lua_CFunction,
}

extern "C" {
    pub fn luaL_register(L: *mut lua_State, libname: *const c_char, l: *const luaL_Reg);
    #[link_name = "luaL_getmetafield"]
    pub fn luaL_getmetafield_(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
    pub fn luaL_callmeta(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
    #[link_name = "luaL_typeerrorL"]
    pub fn luaL_typeerror(L: *mut lua_State, narg: c_int, tname: *const c_char) -> !;
    #[link_name = "luaL_argerrorL"]
    pub fn luaL_argerror(L: *mut lua_State, narg: c_int, extramsg: *const c_char) -> !;
    pub fn luaL_checklstring(L: *mut lua_State, narg: c_int, l: *mut usize) -> *const c_char;
    pub fn luaL_optlstring(
        L: *mut lua_State,
        narg: c_int,
        def: *const c_char,
        l: *mut usize,
    ) -> *const c_char;
    pub fn luaL_checknumber(L: *mut lua_State, narg: c_int) -> lua_Number;
    pub fn luaL_optnumber(L: *mut lua_State, narg: c_int, def: lua_Number) -> lua_Number;

    pub fn luaL_checkboolean(L: *mut lua_State, narg: c_int) -> c_int;
    pub fn luaL_optboolean(L: *mut lua_State, narg: c_int, def: c_int) -> c_int;

    pub fn luaL_checkinteger(L: *mut lua_State, narg: c_int) -> lua_Integer;
    pub fn luaL_optinteger(L: *mut lua_State, narg: c_int, def: lua_Integer) -> lua_Integer;
    pub fn luaL_checkunsigned(L: *mut lua_State, narg: c_int) -> lua_Unsigned;
    pub fn luaL_optunsigned(L: *mut lua_State, narg: c_int, def: lua_Unsigned) -> lua_Unsigned;

    pub fn luaL_checkvector(L: *mut lua_State, narg: c_int) -> *const c_float;
    pub fn luaL_optvector(L: *mut lua_State, narg: c_int, def: *const c_float) -> *const c_float;

    #[link_name = "luaL_checkstack"]
    pub fn luaL_checkstack_(L: *mut lua_State, sz: c_int, msg: *const c_char);
    pub fn luaL_checktype(L: *mut lua_State, narg: c_int, t: c_int);
    pub fn luaL_checkany(L: *mut lua_State, narg: c_int);

    #[link_name = "luaL_newmetatable"]
    pub fn luaL_newmetatable_(L: *mut lua_State, tname: *const c_char) -> c_int;
    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);

    #[link_name = "luaL_errorL"]
    pub fn luaL_error(L: *mut lua_State, fmt: *const c_char, ...) -> !;

    pub fn luaL_checkoption(
        L: *mut lua_State,
        narg: c_int,
        def: *const c_char,
        lst: *const *const c_char,
    ) -> c_int;

    #[link_name = "luaL_tolstring"]
    pub fn luaL_tolstring_(L: *mut lua_State, idx: c_int, len: *mut usize) -> *const c_char;

    pub fn luaL_newstate() -> *mut lua_State;

    // TODO: luaL_findtable

    pub fn luaL_typename(L: *mut lua_State, idx: c_int) -> *const c_char;

    // sandbox libraries and globals
    #[link_name = "luaL_sandbox"]
    pub fn luaL_sandbox_(L: *mut lua_State);
    pub fn luaL_sandboxthread(L: *mut lua_State);
}

//
// Some useful macros (implemented as Rust functions)
//

#[inline(always)]
pub unsafe fn luaL_argcheck(L: *mut lua_State, cond: c_int, arg: c_int, extramsg: *const c_char) {
    if cond == 0 {
        luaL_argerror(L, arg, extramsg);
    }
}

#[inline(always)]
pub unsafe fn luaL_argexpected(L: *mut lua_State, cond: c_int, arg: c_int, tname: *const c_char) {
    if cond == 0 {
        luaL_typeerror(L, arg, tname);
    }
}

#[inline(always)]
pub unsafe fn luaL_checkstring(L: *mut lua_State, n: c_int) -> *const c_char {
    luaL_checklstring(L, n, ptr::null_mut())
}

#[inline(always)]
pub unsafe fn luaL_optstring(L: *mut lua_State, n: c_int, d: *const c_char) -> *const c_char {
    luaL_optlstring(L, n, d, ptr::null_mut())
}

// TODO: luaL_opt

#[inline(always)]
pub unsafe fn luaL_getmetatable(L: *mut lua_State, n: *const c_char) -> c_int {
    lua::lua_getfield(L, LUA_REGISTRYINDEX, n)
}

#[inline(always)]
pub unsafe fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int {
    assert_eq!(t, LUA_REGISTRYINDEX);
    let r = lua::lua_ref(L, -1);
    lua::lua_pop(L, 1);
    r
}

#[inline(always)]
pub unsafe fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int) {
    assert_eq!(t, LUA_REGISTRYINDEX);
    lua::lua_unref(L, r#ref)
}

pub unsafe fn luaL_sandbox(L: *mut lua_State, enabled: c_int) {
    use super::lua::*;

    // set all libraries to read-only
    lua_pushnil(L);
    while lua_next(L, LUA_GLOBALSINDEX) != 0 {
        if lua_istable(L, -1) != 0 {
            lua_setreadonly(L, -1, enabled);
        }
        lua_pop(L, 1);
    }

    // set all builtin metatables to read-only
    lua_pushliteral(L, "");
    lua_getmetatable(L, -1);
    lua_setreadonly(L, -1, enabled);
    lua_pop(L, 2);

    // set globals to readonly and activate safeenv since the env is immutable
    lua_setreadonly(L, LUA_GLOBALSINDEX, enabled);
    lua_setsafeenv(L, LUA_GLOBALSINDEX, enabled);
}

//
// TODO: Generic Buffer Manipulation
//