adding a new feature - MathEvaluation

oberon/src/main/scala/br/unb/cic/oberon/matheval/MathEval.scala

@@ -0,0 +1,38 @@
+package br.unb.cic.oberon.matheval
+
+import br.unb.cic.oberon._
+
+class MathEval() extends Visitor {
+  type T = Integer
+
+  var res = 0
+
+  def getValue() = res
+
+  def visit(v : IntValue) {
+    res = res + v.value
+  }
+
+  def visit(v : BoolValue) {
+
+    if(v.value)
+    res = 1 //set 1 as True
+	 else
+	 res = 0 //set 0 as False
+  }
+
+  def visit(e : AddExp) {
+    res = 
+    e.lhs.accept(this)
+    e.rhs.accept(this) 
+  }
+
+ def visit(e : AndExp) {
+    e.lhs.accept(this)
+    e.rhs.accept(this) 
+    res = res + e.lhs.value + e.rhs.value
+  }
+
+
+
+}

oberon/src/test/scala/br/unb/cic/oberon/matheval/MathEvalTest.scala

@@ -0,0 +1,31 @@
+package br.unb.cic.oberon
+
+import org.scalatest.FunSuite
+
+import br.unb.cic.oberon.matheval._
+
+class MathEvalTest extends FunSuite {
+
+  test("Evaluation of an Int10 is 10") {
+    val int10 = new IntValue(10)
+
+    val v = new MathEval()
+
+    int10.accept(v) 
+
+    assert(10 == v.getValue())
+  }
+
+  test("Evaluation of an Add(Int(5), Int(6)) is 11") {
+    val int5 = new IntValue(5)
+    val int6 = new IntValue(6)
+
+    val add = new AddExp(int5, int6)
+
+    val v = new MathEval()
+
+    add.accept(v) 
+
+    assert(11 == v.getValue())
+  }
+}