improve hashset

tests/modules/hashset/test.lua

@@ -0,0 +1,17 @@
+import("core.base.hashset")
+
+function test_hashset(t)
+    local h = hashset.of(1, 2, 3, 5, 5, 7, 1, 9, 4, 6, 8, 0)
+    t:require(h:size() == 10)
+    t:require_not(h:empty())
+    for item in h:items() do
+        t:require(h:has(item))
+        t:require_not(h:has(item + 10))
+    end
+    local prev = -1
+    for item in h:orderitems() do
+        t:require(item > prev)
+        prev = item
+    end
+end
+

xmake/core/base/hashset.lua

@@ -108,7 +108,62 @@ function hashset_impl:to_array()
     return result
 end
 
--- iterate keys of hashtable
+-- iterate items
+--
+-- @code
+-- for item in instance:items() do
+--   ...
+-- end
+-- @endcode
+--
+function hashset_impl:items()
+    return function (t, item)
+        local k, _ = next(t._DATA, item)
+        if k == hashset._NIL then
+            return nil
+        else
+            return k
+        end
+    end, self, nil
+end
+
+-- iterate order items
+--
+-- @code
+-- for item in instance:orderitems() do
+--   ...
+-- end
+-- @endcode
+--
+function hashset_impl:orderitems()
+    local orderkeys = table.orderkeys(self._DATA, function (a, b)
+        if a == hashset._NIL then
+            a = math.inf
+        end
+        if b == hashset._NIL then
+            b = math.inf
+        end
+        if type(a) == "table" then
+            a = tostring(a)
+        end
+        if type(b) == "table" then
+            b = tostring(b)
+        end
+        return a < b
+    end)
+    local i = 1
+    return function (t, k)
+        k = orderkeys[i]
+        i = i + 1
+        if k == hashset._NIL then
+            return nil
+        else
+            return k
+        end
+    end, self, nil
+end
+
+-- iterate keys (deprecated, please use items())
 --
 -- @code
 -- for _, key in instance:keys() do
@@ -127,7 +182,7 @@ function hashset_impl:keys()
     end, self, nil
 end
 
--- order keys iterator
+-- iterate order keys (deprecated, please use orderitems())
 --
 -- @code
 -- for _, key in instance:orderkeys() do