Negate and modulo array accessors are done.

arr[-1]; // last element

int index = -10;
arr[%index] = 34; // arr[index %% arr.length];

README.md

@@ -388,7 +388,7 @@ Future plans
 		int sqrt(int x?) => x ** 2;
 		sqr();  // NaN
 
-- Negate array accessor ( getter )
+- Negate array accessor ( getter ). status: done
  
 		arr[-1]; // last element
 
@@ -397,6 +397,64 @@ Future plans
 		int index = -10;
 		arr[%index] = 34; // arr[index %% arr.length];
 
+- classes
+
+		class A {
+    
+		    int a = 123;
+    		readonly String about = "class";
+    		
+    		$("button").click(() => console.log("Button Clicked!"));
+    
+    		A(a){
+        		about = "some else";
+    		}
+    
+    		static Hello() => "hello!";
+    
+    		public String about() => about;
+		}
+
+		class B extends A {
+    
+    		B(){
+        		parent();
+        		about += "!";  
+    		}
+    
+    		B.anotherConstructor(){
+        		about = "ups!";  
+    		}
+    
+    		get some => "some " + about;
+    		set some(val) => about += val; 
+		}
+		
+- singletones
+
+		singleton S { // in fact this is object
+    		int x = 45;
+    		String s = "txt";
+    
+    		say(some){
+        		alert(some);
+    		}
+    
+    		int operator[](int index) => index + 584;
+    		operator[]=(int index, int val) => x = index + val;
+    
+		}
+		
+- injectors
+
+		injector String {
+    		String replaceAll(a, b){
+        		String res = this;
+        		while(res.indexOf(a) != -1) res = res.replace(a, b);
+        		return res;
+    		}
+		}
+			
 - static typing	
 - `@use` expressions
 		
@@ -432,39 +490,6 @@ Future plans
 			String info?;
 		}
 
-- classes
-
-		class A {
-    
-		    int a = 123;
-    		readonly String about = "class";
-    		
-    		$("button").click(() => console.log("Button Clicked!"));
-    
-    		A(a){
-        		about = "some else";
-    		}
-    
-    		static Hello() => "hello!";
-    
-    		public String about() => about;
-		}
-
-		class B extends A {
-    
-    		B(){
-        		parent();
-        		about += "!";  
-    		}
-    
-    		B.anotherConstructor(){
-        		about = "ups!";  
-    		}
-    
-    		get some => "some " + about;
-    		set some(val) => about += val; 
-		}
-		
 - classes and typing with templates
 
 		class A<T> {
@@ -474,31 +499,6 @@ Future plans
 		Array<int> arr = [0...10];
 		Object<String, String> obj = { name: "Eric" };
 			
-- singletones
-
-		singleton S { // in fact this is object
-    		int x = 45;
-    		String s = "txt";
-    
-    		say(some){
-        		alert(some);
-    		}
-    
-    		int operator[](int index) => index + 584;
-    		operator[]=(int index, int val) => x = index + val;
-    
-		}
-		
-- injectors
-
-		injector String {
-    		String replaceAll(a, b){
-        		String res = this;
-        		while(res.indexOf(a) != -1) res = res.replace(a, b);
-        		return res;
-    		}
-		}
-	
 - ES6 `for` 
 	
 		for(name of names){

lib/parse.js

@@ -2059,22 +2059,26 @@ Cola.Parser.prototype.subscripts = function(expr, allow_calls) {
 
         var prop, triple;
         if(this.is_js) prop = this.expression(true);
-        else if(this.is("punc","]")) prop = new Cola.AST_Noop();
+        else if(this.is("punc", "]")) prop = new Cola.AST_Noop();
         else {
-            if((this.is("punc","..") || this.is("punc","...")) && !this.is_js) prop = new Cola.AST_Number({ value : 0 });
+            if(this.is("punc", "..") || this.is("punc", "...")) 
-            else prop = this.expression(true, false, true);
+                prop = new Cola.AST_Number({ value : 0 });
-            //this.dumpS();
+            else if(this.is("operator", "%")) 
-            if((this.is("punc","..") || this.is("punc","...")) && !this.is_js){
+                prop = new Cola.AST_UnaryPrefix({ operator : "%", expression : (this.next(), this.expression(true, false, false)) });
-                triple = this.is("punc","...");
+            else 
+                prop = this.expression(true, false, true);
+            
+            if(!(prop instanceof Cola.AST_UnaryPostfix && prop.operator == "%") && (this.is("punc", "..") || this.is("punc", "..."))){
+                triple = this.is("punc", "...");
                 this.next();
                 prop = new Cola.AST_ArrayRange({
                     from   : prop,
-                    to     : ( this.is("punc","]") ? new Cola.AST_Noop() : this.expression(true, false, true) ),
+                    to     : ( this.is("punc", "]") ? new Cola.AST_Noop() : this.expression(true, false, true) ),
                     triple : triple,
                     start  : prop.start,
                     end    : this.prev()
                 });
-            } //else this.restoreS();
+            }
         }
 
         this.expect("]");

lib/std.js

@@ -127,12 +127,23 @@ Cola._ColaRuntime$$error = function _ColaRuntime$$error(_error) {
 };
 Cola._ColaRuntime$$error.i = 11;
 
-Cola._ColaRuntime$$arguments_def = { i : 12 };
+Cola._ColaRuntime$$array_negate_access = function _ColaRuntime$$array_negate_access(_array, _index) {
+    return _array instanceof Array ? _array.length + _index : _index;
+};
+Cola._ColaRuntime$$array_negate_access.i = 12;
+
+Cola._ColaRuntime$$array_modulo_access = function _ColaRuntime$$array_modulo_access(_array, _index) {
+    return _array instanceof Array ? ((_index % _array.length + +_array.length) % _array.length) : _index;
+};
+Cola._ColaRuntime$$array_modulo_access.i = 13;
+
+Cola._ColaRuntime$$arguments_def = { i : 14 };
 
 Cola.$_cola = 
     Cola._ColaRuntime$$is + Cola._ColaRuntime$$isnt + Cola._ColaRuntime$$modulo + Cola._ColaRuntime$$isset + 
     Cola._ColaRuntime$$isntset + Cola._ColaRuntime$$clone + Cola._ColaRuntime$$array_last + Cola._ColaRuntime$$array_range + 
     Cola._ColaRuntime$$array_asplice + Cola._ColaRuntime$$func_named_args + Cola._ColaRuntime$$func_set_named_args + Cola._ColaRuntime$$error +
+    Cola._ColaRuntime$$array_negate_access + Cola._ColaRuntime$$array_modulo_access + 
     "var arguments;";
 
 Cola.Compressor.StdFuncs = {

lib/translate.js

@@ -824,6 +824,38 @@ Cola.AST_Toplevel.prototype.toJavaScript = function(options){
             node = new Cola.AST_Call(props);
         } else
 
+        /*
+            arr[-1]
+
+            to
+
+            arr[_ColaRuntime$$array_negate_access(arr, -1)]
+
+        */
+        if(node instanceof Cola.AST_Sub && node.property instanceof Cola.AST_UnaryPrefix && node.property.operator == "-" && node.property.expression instanceof Cola.AST_Number){
+            _ColaRuntime$$hash[Cola._ColaRuntime$$array_negate_access.i] = true;
+            node.property = new Cola.AST_Call({ 
+                args       : [node.expression, node.property],
+                expression : new Cola.AST_SymbolRef({ name  : '_ColaRuntime$$array_negate_access' })
+            });
+        } else
+
+        /*
+            arr[%index]
+
+            to
+
+            arr[_ColaRuntime$$array_modulo_access(arr, index)]
+
+        */
+        if(node instanceof Cola.AST_Sub && node.property instanceof Cola.AST_UnaryPrefix && node.property.operator == "%"){
+            _ColaRuntime$$hash[Cola._ColaRuntime$$array_modulo_access.i] = true;
+            node.property = new Cola.AST_Call({ 
+                args       : [node.expression, node.property.expression],
+                expression : new Cola.AST_SymbolRef({ name  : '_ColaRuntime$$array_modulo_access' })
+            });
+        } else
+
         /*
             arr[0..1] = 123