select

6 files changed, 90 insertions, 17 deletions

diff --git a/README.md b/README.md
index f9111f6..3174ecb 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@
     - [x] lua_tonumber
     - [x] lua_tonumberx
     - [x] lua_toboolean
+    - [x] lua_topointer
     - [x] lua_pushjsclosure (lua_pushcclosure)
     - [x] lua_pushjsfunction (lua_pushcfunction)
     - [x] lua_pop
@@ -130,7 +131,6 @@
     - [ ] lua_status
     - [ ] lua_stringtonumber
     - [ ] lua_tocfunction
-    - [ ] lua_topointer
     - [ ] lua_tothread
     - [ ] lua_touserdata
     - [ ] lua_upvalueid
@@ -213,11 +213,11 @@
         - [x] xpcall
         - [x] collectgarbage (unavailable)
         - [x] ipairs
+        - [x] select
         - [ ] assert
         - [ ] next
         - [ ] pairs
         - [ ] rawlen
-        - [ ] select
         - [ ] tonumber
         - [ ] dofile
         - [ ] loadfile
diff --git a/src/lapi.js b/src/lapi.js
index e149619..bc4dd54 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -472,6 +472,22 @@ const lua_tonumber = function(L, idx) {
     return lvm.tonumber(index2addr(L, idx))
 };
 
+const lua_topointer = function(L, idx) {
+    let o = index2addr(L, idx);
+    switch (o.ttype()) {
+        case CT.LUA_TTABLE:
+        case CT.LUA_TLCL:
+        case CT.LUA_TCCL:
+        case CT.LUA_TLCF:
+        case CT.LUA_TTHREAD:
+        case CT.LUA_TUSERDATA:
+        case CT.LUA_TLIGHTUSERDATA:
+            return o.value;
+        default:
+            return null;
+    }
+};
+
 const f_call = function(L, ud) {
     ldo.luaD_callnoyield(L, ud.funcOff, ud.nresults);
 };
@@ -653,6 +669,7 @@ module.exports.lua_tointeger       = lua_tointeger;
 module.exports.lua_toboolean       = lua_toboolean;
 module.exports.lua_tolstring       = lua_tolstring;
 module.exports.lua_tostring        = lua_tostring;
+module.exports.lua_topointer       = lua_topointer;
 module.exports.lua_load            = lua_load;
 module.exports.lua_callk           = lua_callk;
 module.exports.lua_call            = lua_call;
diff --git a/src/lauxlib.js b/src/lauxlib.js
index 3ebcc7d..c44780e 100644
--- a/src/lauxlib.js
+++ b/src/lauxlib.js
@@ -92,7 +92,7 @@ const luaL_typename = function(L, i) {
 };
 
 const luaL_argcheck = function(L, cond, arg, extramsg) {
-    if (!cond) throw new Error("bad argument"); // TODO: luaL_argerror
+    if (!cond) throw new Error(extramsg); // TODO: luaL_argerror
 };
 
 const luaL_checkany = function(L, arg) {
diff --git a/src/lbaselib.js b/src/lbaselib.js
index d0e094f..19a990e 100644
--- a/src/lbaselib.js
+++ b/src/lbaselib.js
@@ -138,6 +138,20 @@ const luaB_error = function(L) {
     return lapi.lua_error(L);
 };
 
+const luaB_select = function(L) {
+    let n = lapi.lua_gettop(L);
+    if (lapi.lua_type(L, 1) === CT.LUA_TSTRING && lapi.lua_tostring(L, 1) === "#") {
+        lapi.lua_pushinteger(L, n - 1);
+        return 1;
+    } else {
+        let i = lauxlib.luaL_checkinteger(L, 1);
+        if (i < 0) i = n + i;
+        else if (i > n) i = n;
+        lauxlib.luaL_argcheck(L, 1 <= i, 1, "index out of range");
+        return n - i;
+    }
+};
+
 /*
 ** Continuation function for 'pcall' and 'xpcall'. Both functions
 ** already pushed a 'true' before doing the call, so in case of success
@@ -183,6 +197,7 @@ const base_funcs = {
     "tostring":       luaB_tostring,
     "getmetatable":   luaB_getmetatable,
     "ipairs":         luaB_ipairs,
+    "select":         luaB_select,
     "setmetatable":   luaB_setmetatable,
     "rawequal":       luaB_rawequal,
     "rawset":         luaB_rawset,
diff --git a/tests/lbaselib.js b/tests/lbaselib.js
index 53191eb..73d13a3 100644
--- a/tests/lbaselib.js
+++ b/tests/lbaselib.js
@@ -289,7 +289,7 @@ test('error, protected', function (t) {
     t.ok(
         lapi.lua_tostring(L, -1).endsWith("you fucked up"),
         "Error is on the stack"
-    )
+    );
 });
 
 
@@ -321,7 +321,7 @@ test('pcall', function (t) {
     t.ok(
         lapi.lua_tostring(L, -1).endsWith("you fucked up"),
         "Error is on the stack"
-    )
+    );
 });
 
 
@@ -359,12 +359,12 @@ test('xpcall', function (t) {
     t.ok(
         lapi.lua_tostring(L, -1).startsWith("Something's wrong:"),
         "msgh was called and modified the error"
-    )
+    );
 
     t.ok(
         lapi.lua_tostring(L, -1).endsWith("you fucked up"),
         "msgh was called and modified the error"
-    )
+    );
 });
 
 
@@ -390,7 +390,7 @@ test('ipairs', function (t) {
 
         linit.luaL_openlibs(L);
 
-        lapi.lua_load(L, bc, "test-pcall");
+        lapi.lua_load(L, bc, "test-ipairs");
 
         lapi.lua_call(L, 0, -1);
 
@@ -400,5 +400,46 @@ test('ipairs', function (t) {
         lapi.lua_tointeger(L, -1),
         15,
         "Correct element(s) on the stack"
-    )
+    );
+});
+
+
+test('select', function (t) {
+    let luaCode = `
+        return {select('#', 1, 2, 3)}, {select(2, 1, 2, 3)}, {select(-2, 1, 2, 3)}
+    `, L;
+    
+    t.plan(4);
+
+    t.doesNotThrow(function () {
+
+        let bc = toByteCode(luaCode).dataView;
+
+        L = lauxlib.luaL_newstate();
+
+        linit.luaL_openlibs(L);
+
+        lapi.lua_load(L, bc, "test-select");
+
+        lapi.lua_call(L, 0, -1);
+
+    }, "JS Lua program ran without error");
+
+    t.deepEqual(
+        lapi.lua_topointer(L, -3).array.map(e => e.value),
+        [3],
+        "Correct element(s) on the stack"
+    );
+
+    t.deepEqual(
+        lapi.lua_topointer(L, -2).array.map(e => e.value),
+        [2, 3],
+        "Correct element(s) on the stack"
+    );
+
+    t.deepEqual(
+        lapi.lua_topointer(L, -1).array.map(e => e.value),
+        [2, 3],
+        "Correct element(s) on the stack"
+    );
 });
\ No newline at end of file
diff --git a/tests/lvm.js b/tests/lvm.js
index 273002a..8143508 100644
--- a/tests/lvm.js
+++ b/tests/lvm.js
@@ -74,7 +74,7 @@ test('Binary op', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack.slice(L.top - 12, L.top).map(function (e) { return e.value; }),
+        L.stack.slice(L.top - 12, L.top).map(e => e.value),
         [15, -5, 50, 0.5, 5, 9765625.0, 0, 0, 15, 15, 5120, 0],
         "Program output is correct"
     );
@@ -98,7 +98,7 @@ test('Unary op, LOADBOOL', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack.slice(L.top - 3, L.top).map(function (e) { return e.value; }),
+        L.stack.slice(L.top - 3, L.top).map(e => e.value),
         [-5, true, -6],
         "Program output is correct"
     );
@@ -180,7 +180,7 @@ test('Multiple return', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack.slice(L.top - 3, L.top).map(function (e) { return e.value; }),
+        L.stack.slice(L.top - 3, L.top).map(e => e.value),
         [3, -1, 2],
         "Program output is correct"
     );
@@ -232,7 +232,7 @@ test('VARARG', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack.slice(L.top - 3, L.top).map(function (e) { return e.value; }),
+        L.stack.slice(L.top - 3, L.top).map(e => e.value),
         [1, 2, 3],
         "Program output is correct"
     );
@@ -616,7 +616,7 @@ test('SETLIST', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack[L.top - 1].value.array.map(function (e) { return e.value; }),
+        L.stack[L.top - 1].value.array.map(e => e.value),
         [1, 2, 3, 4, 5, 6, 7, 8, 9],
         "Program output is correct"
     );
@@ -644,7 +644,7 @@ test('Variable SETLIST', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack[L.top - 1].value.array.map(function (e) { return e.value; }),
+        L.stack[L.top - 1].value.array.map(e => e.value),
         [1, 2, 3, 4, 5, 6, 7, 8, 9],
         "Program output is correct"
     );
@@ -668,7 +668,7 @@ test('Long SETLIST', function (t) {
     }, "Program executed without errors");
 
     t.deepEqual(
-        L.stack[L.top - 1].value.array.map(function (e) { return e.value; }),
+        L.stack[L.top - 1].value.array.map(e => e.value),
         [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5],
         "Program output is correct"
     );
@@ -692,7 +692,7 @@ test('Long SETLIST', function (t) {
 //     // }, "Program executed without errors");
 //
 //     t.deepEqual(
-//         L.stack[L.top - 1].value.array.map(function (e) { return e.value; }),
+//         L.stack[L.top - 1].value.array.map(e => e.value),
 //         [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 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5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5],
 //         "Program output is correct"
 //     );