Add support to list.count

src/runtime/list.cpp

@@ -314,6 +314,19 @@ Box* listContains(BoxedList* self, Box *elt) {
     return False;
 }
 
+Box* listCount(BoxedList* self, Box *elt) {
+    int size = self->size;
+    int count = 0;
+
+    for (int i = 0; i < size; i++) {
+        Box* e = self->elts->elts[i];
+        Box* cmp = compareInternal(e, elt, AST_TYPE::Eq, NULL);
+        bool b = nonzero(cmp);
+        if (b)
+            count++;
+    }
+    return new BoxedInt(count);
+}
 
 
 BoxedClass *list_iterator_cls = NULL;
@@ -405,6 +418,8 @@ void setupList() {
     addRTFunction(new_, (void*)listNew2, NULL, 2, false);
     list_cls->giveAttr("__new__", new BoxedFunction(new_));
 
+    list_cls->giveAttr("count", new BoxedFunction(boxRTFunction((void*)listCount, BOXED_INT, 2, false)));
+
     list_cls->freeze();
 
 

test/tests/list.py

@@ -28,3 +28,8 @@ for i in xrange(-5, 4):
     print l3
 
 print [1, 2, 3, 4, 5]
+
+# test count method
+l = [1, 2, 1, 2, 3]
+print l.count(1)
+print l.count(42)