From 9d6afeba223c22163928557c69a102877223d3bd Mon Sep 17 00:00:00 2001
From: Benoit Giannangeli <giann008@gmail.com>
Date: Wed, 15 Feb 2017 22:13:01 +0100
Subject: Everything need to make luaL_newstate work, lua_pushnil test

---
 src/lstate.js | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 102 insertions(+), 13 deletions(-)

(limited to 'src/lstate.js')

diff --git a/src/lstate.js b/src/lstate.js
index 84aefc0..4d71be7 100644
--- a/src/lstate.js
+++ b/src/lstate.js
@@ -1,10 +1,19 @@
 /*jshint esversion: 6 */
 "use strict";
 
-const lua         = require('./lua.js');
-const LUA_MULTRET = lua.LUA_MULTRET;
-const TS          = lua.thread_status;
-const Table       = require('./lobject.js').Table;
+const lua                  = require('./lua.js');
+const Table                = require('./lobject.js').Table;
+const ldo                  = require('./ldo.js');
+const lapi                 = require('./lapi.js');
+const nil                  = ldo.nil;
+const luaD_rawrunprotected = ldo.luaD_rawrunprotected;
+const luaT_init            = require('./ltm.js').luaT_init;
+const CT                   = lua.constant_types;
+const LUA_MULTRET          = lua.LUA_MULTRET;
+const TS                   = lua.thread_status;
+const LUA_NUMTAGS          = lua.LUA_NUMTAGS;
+
+const BASIC_STACK_SIZE = 2 * lua.LUA_MINSTACK;
 
 class CallInfo {
 
@@ -35,20 +44,99 @@ class CallInfo {
 class lua_State {
 
     constructor(cl) {
-        this.top = 1;
-        this.ci = new CallInfo(0, cl, 1, 1, null, null);
-        this.ci.u.l.savedpc = cl.p.code;
-        this.ci.nresults = LUA_MULTRET;
-        this.ciOff = 0;
-        this.stack = [
-            cl
-        ];
+        if (cl) { // TODO: remove
+            this.top = 1;
+            this.ci = new CallInfo(0, cl, 1, 1, null, null);
+            this.ci.u.l.savedpc = cl.p.code;
+            this.ci.nresults = LUA_MULTRET;
+            this.ciOff = 0;
+            this.stack = [
+                cl
+            ];
+        } else {
+            this.base_ci = new CallInfo(); // Will be populated later
+            this.top = 0;
+            this.ci = null;
+            this.ciOff = null;
+            this.stack = [];
+        }
         this.openupval = [];
         this.status = TS.LUA_OK;
+        this.next = null;
+        this.tt = CT.LUA_TTHREAD;
+        this.twups = [this];
+        this.errorJmp = null;
+        // TODO: hooks
+        this.nny = 1;
+        this.errfunc = 0;
+    }
+
+}
+
+class global_State {
+
+    constructor(L) {
+        this.mainthread = L;
+        this.strt = null // TODO: string hash table
+        this.l_registry = nil;
+        this.panic = null;
+        this.version = null;
+        this.twups = [];
+        this.mt = new Array(LUA_NUMTAGS);
     }
 
 }
 
+
+const stack_init = function(L1, L) {
+    L1.stack = new Array(BASIC_STACK_SIZE); // TODO: for now we don't care about the stack size
+    L1.top = 0;
+    let ci = L1.base_ci;
+    ci.next = ci.previous = null;
+    ci.callstatus = 0;
+    ci.func = L1.stack[L1.top];
+    ci.funcOff = L1.top;
+    L1.stack[L1.top++] = nil;
+    ci.top = L1.top + lua.LUA_MINSTACK;
+    L1.ci = ci;
+};
+
+/*
+** Create registry table and its predefined values
+*/
+const init_registry = function(L, g) {
+    let registry = new Table();
+    g.l_registry = registry;
+    registry.value.array[lua.LUA_RIDX_MAINTHREAD] = L;
+    registry.value.array[lua.LUA_RIDX_GLOBALS] = new Table();
+};
+
+/*
+** open parts of the state that may cause memory-allocation errors.
+** ('g->version' != NULL flags that the state was completely build)
+*/
+const f_luaopen = function(L) {
+    let g = L.l_G;
+    stack_init(L, L);
+    init_registry(L, g);
+    // TODO: luaS_init(L);
+    luaT_init(L);
+    g.version = lapi.lua_version(null);
+};
+
+const lua_newstate = function() {
+    let L = new lua_State();
+    let g = new global_State(L);
+
+    L.l_G = g;
+
+    if (luaD_rawrunprotected(L, f_luaopen, null) !== TS.LUA_OK) {
+        L = null;
+    }
+
+    return L;
+};
+
 module.exports.lua_State      = lua_State;
 module.exports.CallInfo       = CallInfo;
 module.exports.CIST_OAH       = (1<<0);  /* original value of 'allowhook' */
@@ -59,4 +147,5 @@ module.exports.CIST_YPCALL    = (1<<4);  /* call is a yieldable protected call *
 module.exports.CIST_TAIL      = (1<<5);  /* call was tail called */
 module.exports.CIST_HOOKYIELD = (1<<6);  /* last hook called yielded */
 module.exports.CIST_LEQ       = (1<<7);  /* using __lt for __le */
-module.exports.CIST_FIN       = (1<<8);   /* call is running a finalizer */
\ No newline at end of file
+module.exports.CIST_FIN       = (1<<8);   /* call is running a finalizer */
+module.exports.lua_newstate   = lua_newstate;
\ No newline at end of file
-- 
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