first stable parser

src/parser/instruction.ts

@@ -1,3 +1,5 @@
+/// <reference path="../vector.ts" />
+
 enum InstructionType
 {
     Point,
@@ -5,7 +7,7 @@ enum InstructionType
     Circle
 }
 
-class Instruction 
+abstract class Instruction 
 {
     public fn: InstructionType;
     public params :Parameter[];
@@ -15,4 +17,35 @@ class Instruction
         this.fn = type;
         this.params = [];
     }
+
+    abstract eval();
+}
+
+class PointInstruction extends Instruction
+{
+    constructor()
+    {
+        super(InstructionType.Point);
+    }
+
+    eval()
+    {
+        return new Vector2D(this.params[0].eval(), this.params[1].eval());
+    }
+}
+
+class LineInstruction extends Instruction
+{
+    constructor()
+    {
+        super(InstructionType.Line);
+    }
+
+    eval()
+    {
+        return [
+            this.params[0].eval(),
+            this.params[1].eval()
+        ];
+    }
 }