Introduce a TString class

1 files changed, 25 insertions, 3 deletions

diff --git a/src/lstring.js b/src/lstring.js
index af434c6..3e94171 100644
--- a/src/lstring.js
+++ b/src/lstring.js
@@ -1,20 +1,41 @@
 "use strict";
 
+const assert = require("assert");
+
 const defs = require('./defs.js');
 
+class TString {
+
+    constructor(L, str) {
+        this.realstring = str;
+    }
+
+    getstr() {
+        return this.realstring;
+    }
+
+    tsslen() {
+        return this.realstring.length;
+    }
+
+}
+
 const luaS_eqlngstr = function(a, b) {
-    return a == b || (a.length == b.length && a.join() == b.join());
+    assert(a instanceof TString);
+    assert(b instanceof TString);
+    return a == b || (a.realstring.length == b.realstring.length && a.realstring.join() == b.realstring.join());
 };
 
 /* converts strings (arrays) to a consistent map key */
 const luaS_hash = function(str) {
-    return str.map(e => `${e}|`).join('');
+    assert(str instanceof TString);
+    return str.realstring.map(e => `${e}|`).join('');
 };
 
 /* variant that takes ownership of array */
 const luaS_bless = function(L, str) {
     Object.freeze(str);
-    return str;
+    return new TString(L, str);
 };
 
 /* makes a copy */
@@ -32,3 +53,4 @@ module.exports.luaS_hash       = luaS_hash;
 module.exports.luaS_bless      = luaS_bless;
 module.exports.luaS_new        = luaS_new;
 module.exports.luaS_newliteral = luaS_newliteral;
+module.exports.TString         = TString;