Fixed crashing when not passing negative key

koptilnya/input_system/cl_input.txt

@@ -27,7 +27,13 @@ function Input:noKeysHolding(axle)
 end
 
 function Input:getAxleValue(axle)
-    return (input.isKeyDown(axle.Positive) and 1 or 0) - (input.isKeyDown(axle.Negative) and 1 or 0)
+    local positiveValue = axle.Positive ~= nil and input.isKeyDown(axle.Positive)
+    local negativeValue = axle.Negative ~= nil and input.isKeyDown(axle.Negative)
+
+    print(positiveValue)
+    print(negativeValue)
+
+    return (positiveValue and 1 or 0) - (negativeValue and 1 or 0) -- (input.isKeyDown(axle.Positive) and 1 or 0) - (input.isKeyDown(axle.Negative) and 1 or 0)
 end
 
 function Input:_trySetTargetValue(key)
@@ -52,14 +58,19 @@ end
 
 function Input:_mapKeys(axles)
     for k, v in pairs(axles) do
+        if v.Negative ~= nil then
             self.keys[v.Negative] = {
                 Axle = k
             }
+        end
 
+        if v.Positive ~= nil then
             self.keys[v.Positive] = {
                 Axle = k
             }
         end
+
+    end
 end
 
 -- Public here

koptilnya/input_system/configs/sample.txt

@@ -0,0 +1,13 @@
+Axles = {
+    Horizontal = {
+        Negative = KEY.D,
+        Positive = KEY.A,
+        Gravity = 0.1,
+        Sensitivity = 0.2
+    },
+    Throttle = {
+        Positive = KEY.W,
+        Gravity = 0.1,
+        Sensitivity = 0.2
+    }
+}

koptilnya/input_system/main.txt

@@ -3,14 +3,8 @@
 -- @shared
 -- @include ./cl_input.txt
 -- @include ./sv_input.txt
-local Axles = {
+-- @include ./configs/sample.txt
-    Horizontal = {
+require('./configs/sample.txt')
-        Negative = KEY.D,
-        Positive = KEY.A,
-        Gravity = 0.1,
-        Sensitivity = 0.2
-    }
-}
 
 local options = {
     Axles = Axles