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/*jshint esversion: 6 */
"use strict";
const llimit = require('./llimit.js');
const sprintf = require('sprintf-js').sprintf;
/*
@@ LUAI_MAXSTACK limits the size of the Lua stack.
** CHANGE it if you need a different limit. This limit is arbitrary;
** its only purpose is to stop Lua from consuming unlimited stack
** space (and to reserve some numbers for pseudo-indices).
*/
const LUAI_MAXSTACK = 1000000;
/*
@@ LUA_IDSIZE gives the maximum size for the description of the source
@@ of a function in debug information.
** CHANGE it if you want a different size.
*/
const LUA_IDSIZE = 60;
const lua_integer2str = function(n) {
return sprintf(LUA_INTEGER_FMT, n);
};
const lua_number2str = function(n) {
return sprintf(LUA_NUMBER_FMT, n);
};
const lua_numbertointeger = function(n) {
return n >= llimit.MIN_INT && n < -llimit.MIN_INT ? n : false;
};
const LUA_INTEGER_FRMLEN = "";
const LUA_NUMBER_FRMLEN = "";
const LUA_INTEGER_FMT = `%${LUA_INTEGER_FRMLEN}d`;
const LUA_NUMBER_FMT = "%.14g";
const lua_getlocaledecpoint = function() {
return (1.1).toLocaleString().substring(1, 2);
};
// See: http://croquetweak.blogspot.fr/2014/08/deconstructing-floats-frexp-and-ldexp.html
const frexp = function(value) {
if (value === 0) return [value, 0];
var data = new DataView(new ArrayBuffer(8));
data.setFloat64(0, value);
var bits = (data.getUint32(0) >>> 20) & 0x7FF;
if (bits === 0) { // denormal
data.setFloat64(0, value * Math.pow(2, 64)); // exp + 64
bits = ((data.getUint32(0) >>> 20) & 0x7FF) - 64;
}
var exponent = bits - 1022;
var mantissa = ldexp(value, -exponent);
return [mantissa, exponent];
};
const ldexp = function(mantissa, exponent) {
var steps = Math.min(3, Math.ceil(Math.abs(exponent) / 1023));
var result = mantissa;
for (var i = 0; i < steps; i++)
result *= Math.pow(2, Math.floor((exponent + i) / steps));
return result;
};
module.exports.frexp = frexp;
module.exports.ldexp = ldexp;
module.exports.LUAI_MAXSTACK = LUAI_MAXSTACK;
module.exports.LUA_IDSIZE = LUA_IDSIZE;
module.exports.LUA_INTEGER_FMT = LUA_INTEGER_FMT;
module.exports.LUA_INTEGER_FRMLEN = LUA_INTEGER_FRMLEN;
module.exports.LUA_NUMBER_FMT = LUA_NUMBER_FMT;
module.exports.LUA_NUMBER_FRMLEN = LUA_NUMBER_FRMLEN;
module.exports.lua_getlocaledecpoint = lua_getlocaledecpoint;
module.exports.lua_integer2str = lua_integer2str;
module.exports.lua_number2str = lua_number2str;
module.exports.lua_numbertointeger = lua_numbertointeger;
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