1 files changed, 317 insertions, 0 deletions
diff --git a/Data/BuiltIn/Libraries/middleclass/spec/metamethods_spec.lua b/Data/BuiltIn/Libraries/middleclass/spec/metamethods_spec.lua
new file mode 100644
index 0000000..73bf883
--- /dev/null
+++ b/Data/BuiltIn/Libraries/middleclass/spec/metamethods_spec.lua
@@ -0,0 +1,317 @@
+local class = require 'middleclass'
+
+local function is_lua_5_2_compatible()
+  return type(rawlen) == 'function'
+end
+
+local function is_lua_5_3_compatible()
+  return type(string.unpack) == 'function'
+end
+
+if is_lua_5_2_compatible() then
+  require 'spec/metamethods_lua_5_2'
+end
+
+if is_lua_5_3_compatible() then
+  require 'spec.metamethods_lua_5_3'
+end
+
+describe('Metamethods', function()
+  describe('Custom Metamethods', function()
+    local Vector, v, w
+    before_each(function()
+      Vector= class('Vector')
+      function Vector.initialize(a,x,y,z) a.x, a.y, a.z = x,y,z end
+      function Vector.__tostring(a) return a.class.name .. '[' .. a.x .. ',' .. a.y .. ',' .. a.z .. ']' end
+      function Vector.__eq(a,b)     return a.x==b.x and a.y==b.y and a.z==b.z end
+      function Vector.__lt(a,b)     return a() < b() end
+      function Vector.__le(a,b)     return a() <= b() end
+      function Vector.__add(a,b)    return a.class:new(a.x+b.x, a.y+b.y ,a.z+b.z) end
+      function Vector.__sub(a,b)    return a.class:new(a.x-b.x, a.y-b.y, a.z-b.z) end
+      function Vector.__div(a,s)    return a.class:new(a.x/s, a.y/s, a.z/s) end
+      function Vector.__unm(a)      return a.class:new(-a.x, -a.y, -a.z) end
+      function Vector.__concat(a,b) return a.x*b.x+a.y*b.y+a.z*b.z end
+      function Vector.__call(a)     return math.sqrt(a.x*a.x+a.y*a.y+a.z*a.z) end
+      function Vector.__pow(a,b)
+        return a.class:new(a.y*b.z-a.z*b.y,a.z*b.x-a.x*b.z,a.x*b.y-a.y*b.x)
+      end
+      function Vector.__mul(a,b)
+        if type(b)=="number" then return a.class:new(a.x*b, a.y*b, a.z*b) end
+        if type(a)=="number" then return b.class:new(a*b.x, a*b.y, a*b.z) end
+      end
+      Vector.__metatable = "metatable of a vector"
+      Vector.__mode = "k"
+
+      v = Vector:new(1,2,3)
+      w = Vector:new(2,4,6)
+    end)
+
+    it('implements __tostring', function()
+      assert.equal(tostring(v), "Vector[1,2,3]")
+    end)
+
+    it('implements __eq', function()
+      assert.equal(v, v)
+    end)
+
+    it('implements __lt', function()
+      assert.is_true(v < w)
+    end)
+
+    it('implements __le', function()
+      assert.is_true(v <= w)
+    end)
+
+    it('implements __add', function()
+      assert.equal(v+w, Vector(3,6,9))
+    end)
+
+    it('implements __sub', function()
+      assert.equal(w-v, Vector(1,2,3))
+    end)
+
+    it('implements __div', function()
+      assert.equal(w/2, Vector(1,2,3))
+    end)
+
+    it('implements __concat', function()
+      assert.equal(v..w, 28)
+    end)
+
+    it('implements __call', function()
+      assert.equal(v(), math.sqrt(14))
+    end)
+
+    it('implements __pow', function()
+      assert.equal(v^w, Vector(0,0,0))
+    end)
+
+    it('implements __mul', function()
+      assert.equal(4*v, Vector(4,8,12))
+    end)
+
+    it('implements __metatable', function()
+      assert.equal("metatable of a vector", getmetatable(v))
+    end)
+
+    it('implements __mode', function()
+      v[{}] = true
+      collectgarbage()
+      for k in pairs(v) do assert.not_table(k) end
+    end)
+
+    --[[
+    it('implements __index', function()
+      assert.equal(b[1], 3)
+    end)
+    --]]
+
+    describe('Inherited Metamethods', function()
+      local Vector2, v2, w2
+      before_each(function()
+        Vector2= class('Vector2', Vector)
+        function Vector2:initialize(x,y,z) Vector.initialize(self,x,y,z) end
+
+        v2 = Vector2:new(1,2,3)
+        w2 = Vector2:new(2,4,6)
+      end)
+
+      it('implements __tostring', function()
+        assert.equal(tostring(v2), "Vector2[1,2,3]")
+      end)
+
+      it('implements __eq', function()
+        assert.equal(v2, v2)
+      end)
+
+      it('implements __lt', function()
+        assert.is_true(v2 < w2)
+      end)
+
+      it('implements __le', function()
+        assert.is_true(v2 <= w2)
+      end)
+
+      it('implements __add', function()
+        assert.equal(v2+w2, Vector2(3,6,9))
+      end)
+
+      it('implements __sub', function()
+        assert.equal(w2-v2, Vector2(1,2,3))
+      end)
+
+      it('implements __div', function()
+        assert.equal(w2/2, Vector2(1,2,3))
+      end)
+
+      it('implements __concat', function()
+        assert.equal(v2..w2, 28)
+      end)
+
+      it('implements __call', function()
+        assert.equal(v2(), math.sqrt(14))
+      end)
+
+      it('implements __pow', function()
+        assert.equal(v2^w2, Vector2(0,0,0))
+      end)
+
+      it('implements __mul', function()
+        assert.equal(4*v2, Vector2(4,8,12))
+      end)
+
+      it('implements __metatable', function()
+        assert.equal("metatable of a vector", getmetatable(v2))
+      end)
+
+      it('implements __mode', function()
+        v2[{}] = true
+        collectgarbage()
+        for k in pairs(v2) do assert.not_table(k) end
+      end)
+
+      it('allows inheriting further', function()
+        local Vector3 = class('Vector3', Vector2)
+        local v3 = Vector3(1,2,3)
+        local w3 = Vector3(3,4,5)
+        assert.equal(v3+w3, Vector3(4,6,8))
+      end)
+
+      describe('Updates', function()
+        it('overrides __add', function()
+          Vector2.__add = function(a, b) return Vector.__add(a, b)/2 end
+          assert.equal(v2+w2, Vector2(1.5,3,4.5))
+        end)
+
+        it('updates __add', function()
+          Vector.__add = Vector.__sub
+          assert.equal(v2+w2, Vector2(-1,-2,-3))
+        end)
+
+        it('does not update __add after overriding', function()
+          Vector2.__add = function(a, b) return Vector.__add(a, b)/2 end
+          Vector.__add = Vector.__sub
+          assert.equal(v2+w2, Vector2(-0.5,-1,-1.5))
+        end)
+
+        it('reverts __add override', function()
+          Vector2.__add = function(a, b) return Vector.__add(a, b)/2 end
+          Vector2.__add = nil
+          assert.equal(v2+w2, Vector2(3,6,9))
+        end)
+      end)
+    end)
+  end)
+
+  describe('Custom __index and __newindex', function()
+    describe('Tables', function()
+      local Proxy, fallback, p
+      before_each(function()
+        Proxy = class('Proxy')
+        fallback = {foo = 'bar', common = 'fallback'}
+        Proxy.__index = fallback
+        Proxy.__newindex = fallback
+        Proxy.common = 'class'
+        p = Proxy()
+      end)
+
+      it('uses __index', function()
+        assert.equal(p.foo, 'bar')
+      end)
+
+      it('does not use __index when field exists in class', function()
+        assert.equal(p.common, 'class')
+      end)
+
+      it('uses __newindex', function()
+        p.key = 'value'
+        assert.equal(fallback.key, 'value')
+      end)
+
+      it('uses __newindex when field exists in class', function()
+        p.common = 'value'
+        assert.equal(p.common, 'class')
+        assert.equal(Proxy.common, 'class')
+        assert.equal(fallback.common, 'value')
+      end)
+    end)
+
+    describe('Functions', function()
+      local Namespace, Rectangle, r
+      before_each(function()
+        Namespace = class('Namespace')
+        function Namespace:__index(name)
+          local getter = self.class[name.."Getter"]
+          if getter then return getter(self) end
+        end
+        function Namespace:__newindex(name, value)
+          local setter = self.class[name.."Setter"]
+          if setter then setter(self, value) else rawset(self, name, value) end
+        end
+        Rectangle = class('Rectangle', Namespace)
+        function Rectangle:initialize(x, y, scale)
+          self._scale, self.x, self.y = 1, x, y
+          self.scale = scale
+        end
+        function Rectangle:scaleGetter() return self._scale end
+        function Rectangle:scaleSetter(v)
+          self.x = self.x*v/self._scale
+          self.y = self.y*v/self._scale
+          self._scale = v
+        end
+        function Rectangle:areaGetter() return self.x * self.y end
+        r = Rectangle(3, 4, 2)
+      end)
+
+      it('uses setter', function()
+        assert.equal(r.x, 6)
+        assert.equal(r.y, 8)
+        r.scale = 3
+        assert.equal(r.x, 9)
+        assert.equal(r.y, 12)
+      end)
+
+      it('uses getters', function()
+        assert.equal(r.scale, 2)
+        assert.equal(r.area, 48)
+      end)
+
+      it('updates inherited __index', function()
+        function Namespace.__index() return 42 end
+        assert.equal(r.area, 42)
+        function Rectangle.__index() return 24 end
+        assert.equal(r.area, 24)
+        function Namespace.__index() return 96 end
+        assert.equal(r.area, 24)
+        Rectangle.__index = nil
+        assert.equal(r.area, 96)
+      end)
+    end)
+  end)
+
+  describe('Default Metamethods', function()
+
+    local Peter, peter
+
+    before_each(function()
+      Peter = class('Peter')
+      peter = Peter()
+    end)
+
+    describe('A Class', function()
+      it('has a call metamethod properly set', function()
+        assert.is_true(peter:isInstanceOf(Peter))
+      end)
+      it('has a tostring metamethod properly set', function()
+        assert.equal(tostring(Peter), 'class Peter')
+      end)
+    end)
+
+    describe('An instance', function()
+      it('has a tostring metamethod, returning a different result from Object.__tostring', function()
+        assert.equal(tostring(peter), 'instance of class Peter')
+      end)
+    end)
+  end)
+
+end)