From 616d80301734074e55cedec8ba187b5cab89ea95 Mon Sep 17 00:00:00 2001
From: Benoit Giannangeli <giann008@gmail.com>
Date: Sun, 26 Feb 2017 08:42:11 +0100
Subject: math.sqrt, math.ult, math.log, math.exp, math.deg, math.rad, ...
 math.min/max, math.type

---
 src/lmathlib.js | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 98 insertions(+), 1 deletion(-)

diff --git a/src/lmathlib.js b/src/lmathlib.js
index 9921cc9..f4cc978 100644
--- a/src/lmathlib.js
+++ b/src/lmathlib.js
@@ -89,6 +89,85 @@ const math_ceil = function(L) {
     return 1;
 };
 
+const math_sqrt = function(L) {
+    lapi.lua_pushnumber(L, Math.sqrt(lauxlib.luaL_checknumber(L, 1)));
+};
+
+const math_ult = function(L) {
+    let a = lauxlib.luaL_checkinteger(L, 1);
+    let b = lauxlib.luaL_checkinteger(L, 2);
+    lapi.lua_pushboolean(L, Math.abs(a) < Math.abs(b));
+    return 1;
+};
+
+const math_log = function(L) {
+    let x = lauxlib.luaL_checknumber(L, 1);
+    if (lapi.lua_isnoneornil(L, 2))
+        res = Math.log(x);
+    else {
+        let base = lauxlib.luaL_checknumber(L, 2);
+        if (base === 2)
+            res = Math.log2(x);
+        else if (base === 10)
+            res = Math.log10(x);
+        else
+            res = Math.log(x)/Math.log(base);
+    }
+    lapi.lua_pushnumber(L, res);
+    return 1;
+};
+
+const math_exp = function(L) {
+    lapi.lua_pushnumber(L, Math.exp(lauxlib.luaL_checknumber(L, 1)));
+    return 1;
+};
+
+const math_deg = function(L) {
+    lapi.lua_pushnumber(L, lauxlib.luaL_checknumber(L, 1) * (180 / Math.PI));
+    return 1;
+};
+
+const math_rad = function(L) {
+    lapi.lua_pushnumber(L, lauxlib.luaL_checknumber(L, 1) * (Math.PI / 180));
+};
+
+const math_min = function(L) {
+    let n = lapi.lua_gettop(L);  /* number of arguments */
+    let imin = 1;  /* index of current minimum value */
+    lauxlib.luaL_argcheck(L, n >= 1, 1, "value expected");
+    for (let i = 2; i <= n; i++){
+        if (lapi.lua_compare(L, i, imin, lua.LUA_OPLT))
+            imin = i;
+    }
+    lapi.lua_pushvalue(L, imin);
+    return 1;
+};
+
+const math_max = function(L) {
+    let n = lapi.lua_gettop(L);  /* number of arguments */
+    let imax = 1;  /* index of current minimum value */
+    lauxlib.luaL_argcheck(L, n >= 1, 1, "value expected");
+    for (let i = 2; i <= n; i++){
+        if (lapi.lua_compare(L, imax, i, lua.LUA_OPLT))
+            imax = i;
+    }
+    lapi.lua_pushvalue(L, imax);
+    return 1;
+};
+
+const math_type = function(L) {
+    if (lapi.lua_type(L, 1) === CT.LUA_TNUMBER) {
+        if (lapi.lua_isinteger(L, 1))
+            lapi.lua_pushliteral(L, "integer");
+        else
+            lapi.lua_pushliteral(L, "float");
+    } else {
+        lauxlib.luaL_checkany(L, 1);
+        lapi.lua_pushnil(L);
+    }
+    return 1;
+};
+
 const mathlib = {
     "abs":       math_abs,
     "acos":      math_acos,
@@ -96,14 +175,32 @@ const mathlib = {
     "atan":      math_atan,
     "ceil":      math_ceil,
     "cos":       math_cos,
+    "deg":       math_deg,
+    "exp":       math_exp,
     "floor":     math_floor,
+    "log":       math_log,
+    "max":       math_max,
+    "min":       math_min,
+    "rad":       math_rad,
     "sin":       math_sin,
+    "sqrt":      math_sqrt,
+    "sqrt":      math_sqrt,
     "tan":       math_tan,
-    "tointeger": math_toint
+    "tointeger": math_toint,
+    "type":      math_type,
+    "ult":       math_ult
 };
 
 const luaopen_math = function(L) {
     lauxlib.luaL_newlib(L, mathlib);
+    lapi.lua_pushnumber(L, Math.PI);
+    lapi.lua_setfield(L, -2, "pi");
+    lapi.lua_pushnumber(L, Number.MAX_VALUE);
+    lapi.lua_setfield(L, -2, "huge");
+    lapi.lua_pushnumber(L, Number.MAX_SAFE_INTEGER);
+    lapi.lua_setfield(L, -2, "maxinteger");
+    lapi.lua_pushnumber(L, Number.MIN_SAFE_INTEGER);
+    lapi.lua_setfield(L, -2, "mininteger");
     return 1;
 };
 
-- 
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