string.upper/lower

3 files changed, 53 insertions, 4 deletions

diff --git a/README.md b/README.md
index a6e11df..8a1ba65 100644
--- a/README.md
+++ b/README.md
@@ -211,13 +211,14 @@
     - [ ] String
         - [x] string.char
         - [x] string.len
+        - [x] string.lower
+        - [x] string.upper
         - [ ] string.byte
         - [ ] string.dump
         - [ ] string.find
         - [ ] string.format
         - [ ] string.gmatch
         - [ ] string.gsub
-        - [ ] string.lower
         - [ ] string.match
         - [ ] string.pack
         - [ ] string.packsize
@@ -225,7 +226,6 @@
         - [ ] string.reverse
         - [ ] string.sub
         - [ ] string.unpack
-        - [ ] string.upper
     - [ ] Package
     - [ ] os
     - [ ] io
diff --git a/src/lstrlib.js b/src/lstrlib.js
index 69f634d..96a33f5 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -25,9 +25,21 @@ const str_char = function(L) {
     return 1;
 };
 
+const str_lower = function(L) {
+    lapi.lua_pushstring(L, lauxlib.luaL_checkstring(L, 1).toLowerCase());
+    return 1;
+};
+
+const str_upper = function(L) {
+    lapi.lua_pushstring(L, lauxlib.luaL_checkstring(L, 1).toUpperCase());
+    return 1;
+};
+
 const strlib = {
-    "len": str_len,
-    "char": str_char
+    "char":  str_char,
+    "len":   str_len,
+    "lower": str_lower,
+    "upper": str_upper
 };
 
 const createmetatable = function(L) {
diff --git a/tests/lstrlib.js b/tests/lstrlib.js
index 494b881..7120525 100644
--- a/tests/lstrlib.js
+++ b/tests/lstrlib.js
@@ -78,4 +78,41 @@ test('string.char', function (t) {
         "hello",
         "Correct element(s) on the stack"
     );
+});
+
+
+test('string.upper, string.lower', function (t) {
+    let luaCode = `
+        return string.upper("hello"), string.lower("HELLO")
+    `, L;
+    
+    t.plan(4);
+
+    t.doesNotThrow(function () {
+
+        L = lauxlib.luaL_newstate();
+
+        linit.luaL_openlibs(L);
+
+        lauxlib.luaL_loadstring(L, luaCode);
+
+    }, "Lua program loaded without error");
+
+    t.doesNotThrow(function () {
+
+        lapi.lua_call(L, 0, -1);
+
+    }, "Lua program ran without error");
+
+    t.strictEqual(
+        lapi.lua_tostring(L, -2),
+        "HELLO",
+        "Correct element(s) on the stack"
+    );
+
+    t.strictEqual(
+        lapi.lua_tostring(L, -1),
+        "hello",
+        "Correct element(s) on the stack"
+    );
 });
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