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/* jshint esversion: 6 */
"use strict";
const assert = require('assert');
const lua = require('./lua.js');
const lapi = require('./lapi.js');
const lauxlib = require('./lauxlib.js');
const CT = lua.constant_types;
const TS = lua.thread_status;
const luaB_print = function(L) {
let n = lapi.lua_gettop(L); /* number of arguments */
let str = "";
lapi.lua_getglobal(L, "tostring");
for (let i = 1; i <= n; i++) {
lapi.lua_pushvalue(L, -1); /* function to be called */
lapi.lua_pushvalue(L, i); /* value to print */
lapi.lua_call(L, 1, 1);
let s = lapi.lua_tolstring(L, -1);
if (s === null)
return lauxlib.luaL_error(L, "'tostring' must return a string to 'print'");
if (i > 1) s = `\t${s}`;
str = `${str}${s}`;
lapi.lua_pop(L, 1);
}
console.log(str);
return 0;
};
const luaB_tostring = function(L) {
lauxlib.luaL_checkany(L, 1);
lauxlib.luaL_tolstring(L, 1);
return 1;
};
const luaB_getmetatable = function(L) {
lauxlib.luaL_checkany(L, 1);
if (!lapi.lua_getmetatable(L, 1)) {
lapi.lua_pushnil(L);
return 1; /* no metatable */
}
lauxlib.luaL_getmetafield(L, 1, "__metatable");
return 1; /* returns either __metatable field (if present) or metatable */
};
const luaB_setmetatable = function(L) {
let t = lapi.lua_type(L, 2);
lauxlib.luaL_checktype(L, 1, CT.LUA_TTABLE);
lauxlib.luaL_argcheck(L, t === CT.LUA_TNIL || t === CT.LUA_TTABLE, 2, "nil or table expected");
if (lauxlib.luaL_getmetafield(L, 1, "__metatable") !== CT.LUA_TNIL)
return lauxlib.luaL_error(L, "cannot change a protected metatable");
lapi.lua_settop(L, 2);
lapi.lua_setmetatable(L, 1);
return 1;
};
const luaB_rawequal = function(L) {
lauxlib.luaL_checkany(L, 1);
lauxlib.luaL_checkany(L, 2);
lapi.lua_pushboolean(L, lapi.lua_rawequal(L, 1, 2));
return 1;
};
const luaB_rawget = function(L) {
lauxlib.luaL_checktype(L, 1, CT.LUA_TTABLE);
lauxlib.luaL_checkany(L, 2);
lapi.lua_settop(L, 2);
lapi.lua_rawget(L, 1);
return 1;
};
const luaB_rawset = function(L) {
lauxlib.luaL_checktype(L, 1, CT.LUA_TTABLE);
lauxlib.luaL_checkany(L, 2);
lauxlib.luaL_checkany(L, 3);
lapi.lua_settop(L, 3);
lapi.lua_rawset(L, 1);
return 1;
};
const luaB_type = function(L) {
let t = lapi.lua_type(L, 1);
lauxlib.luaL_argcheck(L, t != CT.LUA_TNONE, 1, "value expected");
lapi.lua_pushstring(L, lapi.lua_typename(L, t));
return 1;
};
const luaB_error = function(L) {
let level = lauxlib.luaL_optinteger(L, 2, 1);
lapi.lua_settop(L, 1);
if (lapi.lua_type(L, 1) === CT.LUA_TSTRING && level > 0) {
lauxlib.luaL_where(L, level); /* add extra information */
lapi.lua_pushvalue(L, 1);
lapi.lua_concat(L, 2);
}
return lapi.lua_error(L);
};
/*
** Continuation function for 'pcall' and 'xpcall'. Both functions
** already pushed a 'true' before doing the call, so in case of success
** 'finishpcall' only has to return everything in the stack minus
** 'extra' values (where 'extra' is exactly the number of items to be
** ignored).
*/
const finishpcall = function(L, status, extra) {
if (status !== TS.LUA_OK && status !== TS.LUA_YIELD) { /* error? */
lapi.lua_pushboolean(L, 0); /* first result (false) */
lapi.lua_pushvalue(L, -2); /* error message */
return 2; /* return false, msg */
} else
return lapi.lua_gettop(L) - extra;
};
const luaB_pcall = function(L) {
lauxlib.luaL_checkany(L, 1);
lapi.lua_pushboolean(L, 1); /* first result if no errors */
lapi.lua_insert(L, 1); /* put it in place */
let status = lapi.lua_pcallk(L, lapi.lua_gettop(L) - 2, lua.LUA_MULTRET, 0, 0, finishpcall);
return finishpcall(L, status, 0);
};
/*
** Do a protected call with error handling. After 'lua_rotate', the
** stack will have <f, err, true, f, [args...]>; so, the function passes
** 2 to 'finishpcall' to skip the 2 first values when returning results.
*/
const luaB_xpcall = function(L) {
let n = lapi.lua_gettop(L);
lauxlib.luaL_checktype(L, 2, CT.LUA_TFUNCTION); /* check error function */
lapi.lua_pushboolean(L, 1); /* first result */
lapi.lua_pushvalue(L, 1); /* function */
lapi.lua_rotate(L, 3, 2); /* move them below function's arguments */
let status = lapi.lua_pcallk(L, n - 2, lua.LUA_MULTRET, 2, 2, finishpcall);
return finishpcall(L, status, 2);
};
const base_funcs = {
"collectgarbage": function () {},
"print": luaB_print,
"tostring": luaB_tostring,
"getmetatable": luaB_getmetatable,
"setmetatable": luaB_setmetatable,
"rawequal": luaB_rawequal,
"rawset": luaB_rawset,
"rawget": luaB_rawget,
"type": luaB_type,
"error": luaB_error,
"pcall": luaB_pcall,
"xpcall": luaB_xpcall,
};
const luaopen_base = function(L) {
/* open lib into global table */
lapi.lua_pushglobaltable(L);
lauxlib.luaL_setfuncs(L, base_funcs, 0);
/* set global _G */
lapi.lua_pushvalue(L, -1);
lapi.lua_setfield(L, -2, "_G");
/* set global _VERSION */
lapi.lua_pushliteral(L, lua.LUA_VERSION);
lapi.lua_setfield(L, -2, "_VERSION");
return 1;
};
module.exports.luaopen_base = luaopen_base;
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