implement character:try

lib/character/behaviors/map.lua

@@ -39,14 +39,15 @@ end
 function mapBehavior:runTo(target)
     self.t0 = love.timer.getTime()
     self.runTarget = target
-    local charPos = self.position
-    local render = self.owner:has(Tree.behaviors.render)
-    if not render then return end
-    if target.x < charPos.x then
-        render.animation.side = LEFT
-    elseif target.x > charPos.x then
-        render.animation.side = RIGHT
-    end
+    self.owner:try(Tree.behaviors.render,
+        function(render)
+            if target.x < self.position.x then
+                render.animation.side = LEFT
+            elseif target.x > self.position.x then
+                render.animation.side = RIGHT
+            end
+        end
+    )
 end
 
 function mapBehavior:update(dt)

lib/character/behaviors/render.lua

@@ -18,17 +18,20 @@ function renderBehavior:update(dt)
 end
 
 function renderBehavior:draw()
-    local ppm = Tree.level.camera.pixelsPerMeter
-    if not self.owner:has(Tree.behaviors.map) then return end
-    local position = self.owner:has(Tree.behaviors.map).displayedPosition
-    local state = self.owner:getState()
+    self.owner:try(Tree.behaviors.map,
+        function(map)
+            local ppm = Tree.level.camera.pixelsPerMeter
+            local position = map.displayedPosition
+            local state = self.owner:getState()
 
-    if Tree.level.selector.id == self.owner.id then love.graphics.setColor(0.5, 1, 0.5) end
+            if Tree.level.selector.id == self.owner.id then love.graphics.setColor(0.5, 1, 0.5) end
 
-    self.animation.animationTable[state]:draw(Tree.assets.files.sprites.character[state],
-        position.x + 0.5,
-        position.y + 0.5, nil, 1 / ppm * self.animation.side, 1 / ppm, 38, 47)
-    love.graphics.setColor(1, 1, 1)
+            self.animation.animationTable[state]:draw(Tree.assets.files.sprites.character[state],
+                position.x + 0.5,
+                position.y + 0.5, nil, 1 / ppm * self.animation.side, 1 / ppm, 38, 47)
+            love.graphics.setColor(1, 1, 1)
+        end
+    )
 end
 
 return renderBehavior

lib/character/character.lua

@@ -55,8 +55,28 @@ function character:has(behavior)
     return self.behaviors[idx] or nil
 end
 
+--- Если у персонажа есть поведение [behavior], применяет к нему [fn]
+---
+--- Дальше meme для интеллектуалов
+---
+--- *Я: мам купи мне >>=*
+---
+--- *Мама: у нас дома есть >>=*
+---
+--- *Дома:*
+--- @generic T : Behavior
+--- @generic V
+--- @param behavior T
+--- @param fn fun(behavior: T) : V | nil
+--- @return V | nil
+function character:try(behavior, fn)
+    local b = self:has(behavior)
+    if not b then return end
+    return fn(b)
+end
+
 --- usage:
---- addModules( {logic = logic.new(), graphics = graphics.new(), ...} )
+--- addModules( {logic.new(), graphics.new(), ...} )
 ---
 --- or you may chain this if you are a wannabe haskell kiddo
 function character:addBehavior(modules)