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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
const defs = require('./defs.js');
const ldebug = require('./ldebug.js');
const lobject = require('./lobject.js');
const CT = defs.constant_types;
/* converts strings (arrays) to a consistent map key */
const hashstr = function(str) {
return str.map(e => `${e}|`).join('');
};
const table_hash = function(key) {
switch(key.type) {
case CT.LUA_TBOOLEAN:
case CT.LUA_TLIGHTUSERDATA: /* XXX: if user pushes conflicting lightuserdata then the table will do odd things */
case CT.LUA_TNUMFLT:
case CT.LUA_TNUMINT:
case CT.LUA_TTABLE:
case CT.LUA_TLCL:
case CT.LUA_TLCF:
case CT.LUA_TCCL:
case CT.LUA_TUSERDATA:
case CT.LUA_TTHREAD:
return key.value;
case CT.LUA_TSHRSTR:
case CT.LUA_TLNGSTR:
return hashstr(key.value);
default:
throw new Error("unknown key type: " + key.type);
}
};
const luaH_new = function(L) {
let t = {
id: L.l_G.id_counter++,
strong: new Map(),
metatable: null
};
return t;
};
const getgeneric = function(t, hash) {
let v = t.strong.get(hash);
return v ? v.value : lobject.luaO_nilobject;
};
const luaH_getint = function(t, key) {
assert(typeof key == "number" && (key|0) === key);
return getgeneric(t, key);
};
const luaH_getstr = function(t, key) {
assert(Array.isArray(key));
return getgeneric(t, hashstr(key));
};
const luaH_get = function(t, key) {
assert(key instanceof lobject.TValue);
if (key.ttisnil())
return lobject.luaO_nilobject;
return getgeneric(t, table_hash(key));
};
const setgeneric = function(t, hash, key) {
let v = t.strong.get(hash);
if (v)
return v.value;
let tv = new lobject.TValue(CT.LUA_TNIL, null);
t.strong.set(hash, {
key: key,
value: tv
});
return tv;
};
const luaH_setint = function(t, key, value) {
assert(typeof key == "number" && (key|0) === key && value instanceof lobject.TValue);
let hash = key; /* table_hash known result */
let v = t.strong.get(hash);
if (v) {
let tv = v.value;
tv.setfrom(value);
} else {
t.strong.set(hash, {
key: new lobject.TValue(CT.LUA_TNUMINT, key),
value: new lobject.TValue(value.type, value.value)
});
}
};
const luaH_set = function(t, key) {
assert(key instanceof lobject.TValue);
let hash = table_hash(key);
return setgeneric(t, hash, new lobject.TValue(key.type, key.value));
};
const luaH_delete = function(t, key) {
assert(key instanceof lobject.TValue);
let hash = table_hash(key);
t.strong.delete(hash);
};
/*
** Try to find a boundary in table 't'. A 'boundary' is an integer index
** such that t[i] is non-nil and t[i+1] is nil (and 0 if t[1] is nil).
*/
const luaH_getn = function(t) {
let i = 0;
let j = t.strong.size + 1; /* use known size of Map to bound search */
/* now do a binary search between them */
while (j - i > 1) {
let m = Math.floor((i+j)/2);
if (luaH_getint(t, m).ttisnil()) j = m;
else i = m;
}
return i;
};
/*
** Javascript tables don't have any next-like primitive.
** For each call of `next` this does a full iteration up to the item
*/
const luaH_next = function(L, table, keyI) {
let keyO = L.stack[keyI];
let iterresult;
if (keyO.type === CT.LUA_TNIL) {
iterresult = table.strong.keys().next();
} else {
let hash = table_hash(keyO);
if (!table.strong.has(hash))
/* item not in table */
return ldebug.luaG_runerror(L, "invalid key to 'next'");
let indexes = table.strong.keys();
while (1) {
let e = indexes.next();
if (e.done)
throw "unreachable";
else if (e.value == hash)
break;
}
iterresult = indexes.next();
}
if (iterresult.done)
return false;
let entry = table.strong.get(iterresult.value);
L.stack[keyI] = new lobject.TValue(entry.key.type, entry.key.value);
L.stack[keyI+1] = new lobject.TValue(entry.value.type, entry.value.value);
return true;
};
module.exports.luaH_delete = luaH_delete;
module.exports.luaH_get = luaH_get;
module.exports.luaH_getint = luaH_getint;
module.exports.luaH_getn = luaH_getn;
module.exports.luaH_getstr = luaH_getstr;
module.exports.luaH_set = luaH_set;
module.exports.luaH_setint = luaH_setint;
module.exports.luaH_new = luaH_new;
module.exports.luaH_next = luaH_next;
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