Add nada datatype, resolves #11

4 files changed, 55 insertions, 3 deletions

diff --git a/src/main/com/jantuomi/tunkki/core/parser/datatype/Datatype.java b/src/main/com/jantuomi/tunkki/core/parser/datatype/Datatype.java
index a8756cf..a161f09 100644
--- a/src/main/com/jantuomi/tunkki/core/parser/datatype/Datatype.java
+++ b/src/main/com/jantuomi/tunkki/core/parser/datatype/Datatype.java
@@ -16,7 +16,7 @@ abstract public class Datatype<T> {
         Double,
         String,
         Boolean,
-        Void
+        Nada, Void
     }
 
     abstract public Type getType();
diff --git a/src/main/com/jantuomi/tunkki/core/parser/datatype/NadaDatatype.java b/src/main/com/jantuomi/tunkki/core/parser/datatype/NadaDatatype.java
new file mode 100644
index 0000000..e2827f8
--- /dev/null
+++ b/src/main/com/jantuomi/tunkki/core/parser/datatype/NadaDatatype.java
@@ -0,0 +1,46 @@
+package com.jantuomi.tunkki.core.parser.datatype;
+
+import com.jantuomi.tunkki.exception.TunkkiError;
+
+/**
+ * Created by jan on 29.7.2016.
+ */
+public class NadaDatatype extends Datatype<Integer> {
+    @Override
+    public Type getType() {
+        return Type.Nada;
+    }
+
+    @Override
+    public String toString() {
+        return "nada";
+    }
+
+    @Override
+    public Datatype<Integer> add(Datatype<Integer> other) throws TunkkiError {
+        doOperation();
+        return null;
+    }
+
+    @Override
+    public Datatype<Integer> subtract(Datatype<Integer> other) throws TunkkiError {
+        doOperation();
+        return null;
+    }
+
+    @Override
+    public Datatype<Integer> multiply(Datatype<Integer> other) throws TunkkiError {
+        doOperation();
+        return null;
+    }
+
+    @Override
+    public Datatype<Integer> divide(Datatype<Integer> other) throws TunkkiError {
+        doOperation();
+        return null;
+    }
+
+    private void doOperation() throws TunkkiError {
+        throw new TunkkiError(TunkkiError.ExceptionType.NadaError, -1);
+    }
+}
diff --git a/src/main/com/jantuomi/tunkki/core/runtime/State.java b/src/main/com/jantuomi/tunkki/core/runtime/State.java
index a7e8e99..1b25712 100644
--- a/src/main/com/jantuomi/tunkki/core/runtime/State.java
+++ b/src/main/com/jantuomi/tunkki/core/runtime/State.java
@@ -1,6 +1,7 @@
 package com.jantuomi.tunkki.core.runtime;
 
 import com.jantuomi.tunkki.core.parser.datatype.Datatype;
+import com.jantuomi.tunkki.core.parser.datatype.NadaDatatype;
 import com.jantuomi.tunkki.core.runtime.builtins.BuiltinManager;
 import com.jantuomi.tunkki.exception.TunkkiError;
 
@@ -28,8 +29,11 @@ public class State {
             globalScope.addFunction(builtin.getName(), builtin);
         }
 
-        scopes.push(globalScope);
+        /* Add nada to the scope */
+        globalScope.addVariable("nada");
+        globalScope.setVariableValue("nada", new NadaDatatype());
 
+        scopes.push(globalScope);
     }
 
     private Datatype resolveSymbol(String symbol) throws TunkkiError {
diff --git a/src/main/com/jantuomi/tunkki/exception/TunkkiError.java b/src/main/com/jantuomi/tunkki/exception/TunkkiError.java
index 24431ba..9e0163c 100644
--- a/src/main/com/jantuomi/tunkki/exception/TunkkiError.java
+++ b/src/main/com/jantuomi/tunkki/exception/TunkkiError.java
@@ -19,7 +19,8 @@ public class TunkkiError extends Exception {
         ExpectedDifferentTokenError,
         UndeclaredSymbolError,
         IncludeError,
-        GeneralError
+        GeneralError,
+        NadaError
     }
 
     private static Map<ExceptionType, String> errorTexts = new HashMap<>();
@@ -33,6 +34,7 @@ public class TunkkiError extends Exception {
         errorTexts.put(ExceptionType.UndeclaredSymbolError, "No symbol %s defined, parameters: [%s].");
         errorTexts.put(ExceptionType.IncludeError, "File %s could not be included.");
         errorTexts.put(ExceptionType.GeneralError, "%s");
+        errorTexts.put(ExceptionType.NadaError, "Can't do operation with a nada value.");
     }
 
     private ExceptionType exceptionType;