lua53-sys 0.1.1

//! Definitions from `lauxlib.h`.

use libc::{c_int, c_char, c_void, size_t};
use lua::{self, lua_State, lua_CFunction, lua_Integer, lua_Number};
use luaconf::LUAL_BUFFERSIZE;
use std::ptr;

pub use super::glue::LUAL_NUMSIZES;
pub use super::glue::LUA_FILEHANDLE;

// extra error code for `luaL_load`
pub const LUA_ERRFILE: c_int = lua::LUA_ERRERR + 1;

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


#[inline(always)]
pub unsafe fn luaL_checkversion(L: *mut lua_State) {
    luaL_checkversion_(L,
                       lua::LUA_VERSION_NUM as lua_Number,
                       LUAL_NUMSIZES as size_t)
}

extern "C" {
    pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: size_t);

    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;
    pub fn luaL_tolstring(L: *mut lua_State, idx: c_int, len: *mut size_t) -> *const c_char;
    pub fn luaL_argerror(L: *mut lua_State, arg: c_int, l: *const c_char) -> c_int;
    pub fn luaL_checklstring(L: *mut lua_State, arg: c_int, l: *mut size_t) -> *const c_char;
    pub fn luaL_optlstring(L: *mut lua_State,
                           arg: c_int,
                           def: *const c_char,
                           l: *mut size_t)
                           -> *const c_char;
    pub fn luaL_checknumber(L: *mut lua_State, arg: c_int) -> lua_Number;
    pub fn luaL_optnumber(L: *mut lua_State, arg: c_int, def: lua_Number) -> lua_Number;
    pub fn luaL_checkinteger(L: *mut lua_State, arg: c_int) -> lua_Integer;
    pub fn luaL_optinteger(L: *mut lua_State, arg: c_int, def: lua_Integer) -> lua_Integer;

    pub fn luaL_checkstack(L: *mut lua_State, sz: c_int, msg: *const c_char);
    pub fn luaL_checktype(L: *mut lua_State, arg: c_int, t: c_int);
    pub fn luaL_checkany(L: *mut lua_State, arg: c_int);

    pub fn luaL_newmetatable(L: *mut lua_State, tname: *const c_char) -> c_int;
    pub fn luaL_setmetatable(L: *mut lua_State, tname: *const c_char);
    pub fn luaL_testudata(L: *mut lua_State, ud: c_int, tname: *const c_char) -> *mut c_void;
    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, ...) -> c_int;

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

    pub fn luaL_fileresult(L: *mut lua_State, stat: c_int, fname: *const c_char) -> c_int;
    pub fn luaL_execresult(L: *mut lua_State, stat: c_int) -> c_int;
}

// Pre-defined references.
pub const LUA_NOREF: c_int = -2;
pub const LUA_REFNIL: c_int = -1;

extern "C" {
    pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
    pub fn luaL_unref(L: *mut lua_State, t: c_int, r: c_int);

    pub fn luaL_loadfilex(L: *mut lua_State,
                          filename: *const c_char,
                          mode: *const c_char)
                          -> c_int;
}

#[inline(always)]
pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
    luaL_loadfilex(L, f, ptr::null())
}

extern "C" {
    pub fn luaL_loadbufferx(L: *mut lua_State,
                            buff: *const c_char,
                            sz: size_t,
                            name: *const c_char,
                            mode: *const c_char)
                            -> c_int;
    pub fn luaL_loadstring(L: *mut lua_State, s: *const c_char) -> c_int;

    pub fn luaL_newstate() -> *mut lua_State;

    pub fn luaL_len(L: *mut lua_State, idx: c_int) -> lua_Integer;

    pub fn luaL_gsub(L: *mut lua_State,
                     s: *const c_char,
                     p: *const c_char,
                     r: *const c_char)
                     -> *const c_char;

    pub fn luaL_setfuncs(L: *mut lua_State, l: *const luaL_Reg, nup: c_int);

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

    pub fn luaL_traceback(L: *mut lua_State,
                          L1: *mut lua_State,
                          msg: *const c_char,
                          level: c_int);

    pub fn luaL_requiref(L: *mut lua_State,
                         modname: *const c_char,
                         openf: lua_CFunction,
                         glb: c_int);
}

#[inline(always)]
pub unsafe fn luaL_newlibtable(L: *mut lua_State, l: &[luaL_Reg]) {
    lua::lua_createtable(L, 0, l.len() as c_int)
}

#[inline(always)]
pub unsafe fn luaL_newlib(L: *mut lua_State, l: &[luaL_Reg]) {
    luaL_checkversion(L);
    luaL_newlibtable(L, l);
    luaL_setfuncs(L, l.as_ptr(), 0)
}

#[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_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())
}

#[inline(always)]
pub unsafe fn luaL_typename(L: *mut lua_State, i: c_int) -> *const c_char {
    lua::lua_typename(L, lua::lua_type(L, i))
}

#[inline(always)]
pub unsafe fn luaL_dofile(L: *mut lua_State, filename: *const c_char) -> c_int {
    let status = luaL_loadfile(L, filename);
    if status == 0 {
        lua::lua_pcall(L, 0, lua::LUA_MULTRET, 0)
    } else {
        status
    }
}

#[inline(always)]
pub unsafe fn luaL_dostring(L: *mut lua_State, s: *const c_char) -> c_int {
    let status = luaL_loadstring(L, s);
    if status == 0 {
        lua::lua_pcall(L, 0, lua::LUA_MULTRET, 0)
    } else {
        status
    }
}

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

// luaL_opt would be implemented here but it is undocumented, so it's omitted

#[inline(always)]
pub unsafe fn luaL_loadbuffer(L: *mut lua_State,
                              s: *const c_char,
                              sz: size_t,
                              n: *const c_char)
                              -> c_int {
    luaL_loadbufferx(L, s, sz, n, ptr::null())
}

#[repr(C)]
pub struct luaL_Buffer {
    pub b: *mut c_char,
    pub size: size_t,
    pub n: size_t,
    pub L: *mut lua_State,
    pub initb: [c_char; LUAL_BUFFERSIZE as usize],
}

// TODO: Test this thoroughly
#[inline(always)]
pub unsafe fn luaL_addchar(B: *mut luaL_Buffer, c: c_char) {
    // (B)->n < (B) -> size || luaL_prepbuffsize((B), 1)
    if (*B).n < (*B).size {
        luaL_prepbuffsize(B, 1);
    }
    // (B)->b[(B)->n++] = (c)
    let offset = (*B).b.offset((*B).n as isize);
    ptr::write(offset, c);
    (*B).n += 1;
}

#[inline(always)]
pub unsafe fn luaL_addsize(B: *mut luaL_Buffer, s: size_t) {
    (*B).n += s;
}

extern "C" {
    pub fn luaL_buffinit(L: *mut lua_State, B: *mut luaL_Buffer);
    pub fn luaL_prepbuffsize(B: *mut luaL_Buffer, sz: size_t) -> *mut c_char;
    pub fn luaL_addlstring(B: *mut luaL_Buffer, s: *const c_char, l: size_t);
    pub fn luaL_addstring(B: *mut luaL_Buffer, s: *const c_char);
    pub fn luaL_addvalue(B: *mut luaL_Buffer);
    pub fn luaL_pushresult(B: *mut luaL_Buffer);
    pub fn luaL_pushresultsize(B: *mut luaL_Buffer, sz: size_t);
    pub fn luaL_buffinitsize(L: *mut lua_State, B: *mut luaL_Buffer, sz: size_t) -> *mut c_char;
}

pub unsafe fn luaL_prepbuffer(B: *mut luaL_Buffer) -> *mut c_char {
    luaL_prepbuffsize(B, LUAL_BUFFERSIZE as size_t)
}

#[repr(C)]
pub struct luaL_Stream {
    pub f: *mut ::libc::FILE,
    pub closef: lua_CFunction,
}

extern "C" {
    pub fn luaL_openlibs(L: *mut lua_State);
}