Copy ItemStack functions over to LiquidStack (#5080)

core/src/mindustry/type/LiquidStack.java

@@ -1,8 +1,10 @@
 package mindustry.type;
 
+import arc.math.*;
+import arc.struct.*;
 import mindustry.content.*;
 
-public class LiquidStack{
+public class LiquidStack implements Comparable<LiquidStack>{
     public Liquid liquid;
     public float amount;
 
@@ -13,9 +15,60 @@ public class LiquidStack{
 
     /** serialization only*/
     protected LiquidStack(){
+        //prevent nulls.
         liquid = Liquids.water;
     }
 
+    public LiquidStack set(Liquid liquid, float amount){
+        this.liquid = liquid;
+        this.amount = amount;
+        return this;
+    }
+
+    public LiquidStack copy(){
+        return new LiquidStack(liquid, amount);
+    }
+
+    public boolean equals(LiquidStack other){
+        return other != null && other.liquid == liquid && other.amount == amount;
+    }
+
+    public static LiquidStack[] mult(LiquidStack[] stacks, float amount){
+        LiquidStack[] copy = new LiquidStack[stacks.length];
+        for(int i = 0; i < copy.length; i++){
+            copy[i] = new LiquidStack(stacks[i].liquid, Mathf.round(stacks[i].amount * amount));
+        }
+        return copy;
+    }
+
+    public static LiquidStack[] with(Object... items){
+        LiquidStack[] stacks = new LiquidStack[items.length / 2];
+        for(int i = 0; i < items.length; i += 2){
+            stacks[i / 2] = new LiquidStack((Liquid)items[i], ((Number)items[i + 1]).intValue());
+        }
+        return stacks;
+    }
+
+    public static Seq<LiquidStack> list(Object... items){
+        Seq<LiquidStack> stacks = new Seq<>(items.length / 2);
+        for(int i = 0; i < items.length; i += 2){
+            stacks.add(new LiquidStack((Liquid)items[i], ((Number)items[i + 1]).intValue()));
+        }
+        return stacks;
+    }
+
+    @Override
+    public int compareTo(LiquidStack liquidStack){
+        return liquid.compareTo(liquidStack.liquid);
+    }
+
+    @Override
+    public boolean equals(Object o){
+        if(this == o) return true;
+        if(!(o instanceof LiquidStack stack)) return false;
+        return amount == stack.amount && liquid == stack.liquid;
+    }
+
     @Override
     public String toString(){
         return "LiquidStack{" +