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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
const lstate = require('./lstate.js');
const lapi = require('./lapi.js');
const lua = require('./lua.js');
const CT = lua.constant_types;
const panic = function(L) {
console.log(`PANIC: unprotected error in call to Lua API (...)`);
return 0;
}
const luaL_newstate = function() {
let L = lstate.lua_newstate();
if (L) lapi.lua_atpanic(L, panic);
return L;
};
const luaL_typename = function(L, i) {
return lapi.lua_typename(L, lapi.lua_type(L, i));
};
const luaL_checkany = function(L, arg) {
if (lapi.lua_type(L, arg) === CT.LUA_TNONE)
throw new Error("value expected"); // TODO: luaL_argerror(L, arg, "value expected");
};
const luaL_getmetafield = function(L, obj, event) {
if (!lapi.lua_getmetatable(L, obj))
return CT.LUA_TNIL;
else {
lapi.lua_pushstring(L, event);
let tt = lapi.lua_rawget(L, -2);
if (tt === CT.LUA_TNIL)
lapi.lua_pop(L, 2);
return tt;
}
};
const luaL_callmeta = function(L, obj, event) {
obj = lapi.lua_absindex(L, obj);
if (luaL_getmetafield(L, obj, event) === CT.LUA_TNIL)
return false;
lapi.lua_pushvalue(L, obj);
lapi.lua_call(L, 1, 1);
return true;
};
const luaL_tolstring = function(L, idx, len) {
if (luaL_callmeta(L, idx, "__tostring")) {
if (!lapi.lua_isstring(L, -1))
throw new Error("'__tostring' must return a string"); // TODO: luaL_error
} else {
switch(lapi.lua_type(L, idx)) {
case CT.LUA_TNUMBER:
case CT.LUA_TSTRING:
case CT.LUA_TBOOLEAN:
lapi.lua_pushstring(L, `${lapi.index2addr(L, idx).value}`);
break;
case CT.LUA_TNIL:
lapi.lua_pushstring(L, `nil`);
break;
default:
let tt = luaL_getmetafield(L, idx, "__name");
let kind = tt === CT.LUA_TSTRING ? lua_tostring(L, -1) : luaL_typename(L, idx);
lapi.lua_pushstring(L, `${kind}`); // We can't print memory address in JS
if (tt !== CT.LUA_TNIL)
lapi.lua_remove(L, -2);
break;
}
}
return lapi.lua_tolstring(L, -1, len);
};
/*
** Stripped-down 'require': After checking "loaded" table, calls 'openf'
** to open a module, registers the result in 'package.loaded' table and,
** if 'glb' is true, also registers the result in the global table.
** Leaves resulting module on the top.
*/
const luaL_requiref = function(L, modname, openf, glb) {
luaL_getsubtable(L, lua.LUA_REGISTRYINDEX, lua.LUA_LOADED_TABLE);
lapi.lua_getfield(L, -1, modname); /* LOADED[modname] */
if (!lapi.lua_toboolean(L, -1)) { /* package not already loaded? */
lapi.lua_pop(L, 1); /* remove field */
lapi.lua_pushcfunction(L, openf);
lapi.lua_pushstring(L, modname); /* argument to open function */
lapi.lua_call(L, 1, 1); /* call 'openf' to open module */
lapi.lua_pushvalue(L, -1); /* make copy of module (call result) */
lapi.lua_setfield(L, -3, modname); /* LOADED[modname] = module */
}
lapi.lua_remove(L, -2); /* remove LOADED table */
if (glb) {
lua_pushvalue(L, -1); /* copy of module */
lua_setglobal(L, modname); /* _G[modname] = module */
}
};
/*
** ensure that stack[idx][fname] has a table and push that table
** into the stack
*/
const luaL_getsubtable = function(L, idx, fname) {
if (lapi.lua_getfield(L, idx, fname) === CT.LUA_TTABLE)
return true; /* table already there */
else {
lapi.lua_pop(L, 1); /* remove previous result */
idx = lapi.lua_absindex(L, idx);
lapi.lua_newtable(L);
lapi.lua_pushvalue(L, -1); /* copy to be left at top */
lapi.lua_setfield(L, idx, fname); /* assign new table to field */
return false; /* false, because did not find table there */
}
};
/*
** set functions from list 'l' into table at top - 'nup'; each
** function gets the 'nup' elements at the top as upvalues.
** Returns with only the table at the stack.
*/
const luaL_setfuncs = function(L, l, nup) {
luaL_checkstack(L, nup, "too many upvalues");
for (lib in l) { /* fill the table with given functions */
for (let i = 0; i < nup; i++) /* copy upvalues to the top */
lapi.lua_pushvalue(L, -nup);
lapi.lua_pushcclosure(L, l[lib], nup); /* closure with those upvalues */
lapi.lua_setfield(L, -(nup + 2), lib);
}
lapi.lua_pop(l, nup); /* remove upvalues */
};
/*
** Ensures the stack has at least 'space' extra slots, raising an error
** if it cannot fulfill the request. (The error handling needs a few
** extra slots to format the error message. In case of an error without
** this extra space, Lua will generate the same 'stack overflow' error,
** but without 'msg'.)
*/
const luaL_checkstack = function(L, space, msg) {
if (!lapi.luaL_checkstack(L, space)) {
if (msg)
throw new Error(L, `stack overflow (${msg})`);
else
throw new Error(L, 'stack overflow'); // TODO: luaL_error
}
};
module.exports.luaL_newstate = luaL_newstate;
module.exports.luaL_typename = luaL_typename;
module.exports.luaL_checkany = luaL_checkany;
module.exports.luaL_callmeta = luaL_callmeta;
module.exports.luaL_getmetafield = luaL_getmetafield;
module.exports.luaL_requiref = luaL_requiref;
module.exports.luaL_getsubtable = luaL_getsubtable;
module.exports.luaL_setfuncs = luaL_setfuncs;
module.exports.luaL_checkstack = luaL_checkstack;
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