More logic

core/src/mindustry/logic/LBuilder.java

@@ -0,0 +1,49 @@
+package mindustry.logic;
+
+import arc.struct.*;
+
+/** "Compiles" a sequence of statements into instructions. */
+public class LBuilder{
+    private int lastVar;
+    /** Maps names to variable IDs. */
+    private ObjectIntMap<String> vars = new ObjectIntMap<>();
+    /** Maps variable IDs to their constant value. */
+    private IntMap<Object> constants = new IntMap<>();
+
+    public LBuilder(){
+        //add default constant variables
+        putConst("false", 0);
+        putConst("true", 1);
+    }
+
+    /** @return a variable ID by name.
+     * This may be a constant variable referring to a number or object. */
+    public int var(String symbol){
+        try{
+            double value = Double.parseDouble(symbol);
+            //this creates a hidden const variable with the specified value
+            String key = "___" + value;
+            return putConst(key, value);
+        }catch(NumberFormatException e){
+            return putVar(symbol);
+        }
+    }
+
+    /** Adds a constant value by name. */
+    private int putConst(String name, double value){
+        int id = putVar(name);
+        constants.put(id, value);
+        return id;
+    }
+
+    /** Registers a variable name mapping. */
+    private int putVar(String name){
+        if(vars.containsKey(name)){
+            return vars.get(name);
+        }else{
+            int id = lastVar++;
+            vars.put(name, id);
+            return id;
+        }
+    }
+}