string.reverse

3 files changed, 38 insertions, 1 deletions

diff --git a/README.md b/README.md
index 51c4b29..dffa1ec 100644
--- a/README.md
+++ b/README.md
@@ -213,6 +213,7 @@
         - [x] string.len
         - [x] string.lower
         - [x] string.rep
+        - [x] string.reverse
         - [x] string.upper
         - [ ] string.byte
         - [ ] string.dump
@@ -223,7 +224,6 @@
         - [ ] string.match
         - [ ] string.pack
         - [ ] string.packsize
-        - [ ] string.reverse
         - [ ] string.sub
         - [ ] string.unpack
     - [ ] Package
diff --git a/src/lstrlib.js b/src/lstrlib.js
index 11b266a..2f89777 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -25,6 +25,11 @@ const str_char = function(L) {
     return 1;
 };
 
+const str_reverse = function(L) {
+    lapi.lua_pushstring(L, lauxlib.luaL_checkstring(L, 1).split("").reverse().join(""));
+    return 1;
+};
+
 const str_lower = function(L) {
     lapi.lua_pushstring(L, lauxlib.luaL_checkstring(L, 1).toLowerCase());
     return 1;
@@ -49,6 +54,7 @@ const strlib = {
     "len":   str_len,
     "lower": str_lower,
     "rep": str_rep,
+    "reverse": str_reverse,
     "upper": str_upper
 };
 
diff --git a/tests/lstrlib.js b/tests/lstrlib.js
index 56fa2a3..d4e8493 100644
--- a/tests/lstrlib.js
+++ b/tests/lstrlib.js
@@ -146,4 +146,35 @@ test('string.rep', function (t) {
         "hello, hello, hello",
         "Correct element(s) on the stack"
     );
+});
+
+
+test('string.reverse', function (t) {
+    let luaCode = `
+        return string.reverse("olleh")
+    `, L;
+    
+    t.plan(3);
+
+    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, -1),
+        "hello",
+        "Correct element(s) on the stack"
+    );
 });
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