Tokenizer will now only accept multi-line strings if the newline is preceeded by a backspace.

src/MOS/6502/assembler/tokenizer.js

 }
 
 function isOp(c){
-  return ("=+-/*#".indexOf(c) >= 0);
+  return ("=+-/*#<>!".indexOf(c) >= 0);
 }
 
 
     this.__stream = GetTextStream(input);
   }
 
-  genTokenObject(type, val){
+  genTokenObject(type, val, line, col){
     return {
       type: type,
       val: val,
-      line: this.__stream.line(),
-      col: this.__stream.col()
+      line: (typeof(line) === 'number') ? line : this.__stream.line(),
+      col: (typeof(col) === 'number') ? col : this.__stream.col()
     }
   }
 
   readString(end){
     var str = "";
     var escaped = false;
+    var line = this.__stream.line();
+    var col = this.__stream.col();
+    console.log(line);
     this.__stream.next();
     while (!this.__stream.eof()){
       let c = this.__stream.next();
         escaped = false;
       } else if (c === "\\"){
         escaped = true;
+      } else if (c === "\n"){
+        this.__stream.die("String terminated early.");
       } else if (c === end){
         break;
       } else {
         str += c;
       }
     }
-    return this.genTokenObject('string', str);
+    return this.genTokenObject('string', str, line, col);
   }
 
   readDirective(){
     } else if (isPunctuation(c)){
       return this.genTokenObject('punc', this.__stream.next());
     } else if (isOp(c)){
-      return this.genTokenObject('op', this.__stream.next());
+      return this.genTokenObject('op', this.readWhile(isOp));
     }
     this.__stream.die("Unable to process character '" + c + "'.");
   }