5 files changed, 43 insertions, 2 deletions

diff --git a/ast/src/main/java/lv/enes/orang/ast/ArgSpec.java b/ast/src/main/java/lv/enes/orang/ast/ArgSpec.java
new file mode 100644
index 0000000..e167e8f
--- /dev/null
+++ b/ast/src/main/java/lv/enes/orang/ast/ArgSpec.java
@@ -0,0 +1,26 @@
+package lv.enes.orang.ast;
+
+public class ArgSpec {
+        public final Type type;
+        public final String name;
+
+        private static final ArgSpec NOTHING = new ArgSpec(Type.NOTHING, null);
+
+        public static ArgSpec nothing() {
+                return NOTHING;
+        }
+
+        public static ArgSpec named(String name) {
+                return new ArgSpec(Type.NAMED, name);
+        }
+
+        private ArgSpec(Type type, String name) {
+                this.type = type;
+                this.name = name;
+        }
+
+        public enum Type {
+                NOTHING,
+                NAMED,
+        }
+}
diff --git a/ast/src/main/java/lv/enes/orang/ast/DefSpec.java b/ast/src/main/java/lv/enes/orang/ast/DefSpec.java
index 2233d3f..5e6cc68 100644
--- a/ast/src/main/java/lv/enes/orang/ast/DefSpec.java
+++ b/ast/src/main/java/lv/enes/orang/ast/DefSpec.java
@@ -2,5 +2,5 @@ package lv.enes.orang.ast;
 
 import java.util.List;
 
-public record DefSpec(String name, List<String> args) {
+public record DefSpec(String name, List<ArgSpec> args) {
 }
diff --git a/ast/src/main/java/lv/enes/orang/ast/ExpressionVisitor.java b/ast/src/main/java/lv/enes/orang/ast/ExpressionVisitor.java
index ddb1157..70f8a5e 100644
--- a/ast/src/main/java/lv/enes/orang/ast/ExpressionVisitor.java
+++ b/ast/src/main/java/lv/enes/orang/ast/ExpressionVisitor.java
@@ -19,4 +19,5 @@ public interface ExpressionVisitor<R, E extends OrangException> {
         R visitStringLiteral(StringLiteral expr) throws E;
         R visitUnaryExpression(UnaryExpression expr) throws E;
         R visitVariable(VariableExpression expr) throws E;
+        R visitVoidExpression() throws E;
 }
diff --git a/ast/src/main/java/lv/enes/orang/ast/FnExpression.java b/ast/src/main/java/lv/enes/orang/ast/FnExpression.java
index 68f43af..0bf322c 100644
--- a/ast/src/main/java/lv/enes/orang/ast/FnExpression.java
+++ b/ast/src/main/java/lv/enes/orang/ast/FnExpression.java
@@ -3,7 +3,7 @@ package lv.enes.orang.ast;
 import lv.enes.orang.utils.NonEmptyList;
 import lv.enes.orang.core.OrangException;
 
-public record FnExpression(NonEmptyList<String> args, Expression body) implements Expression {
+public record FnExpression(NonEmptyList<ArgSpec> args, Expression body) implements Expression {
         @Override
         public <R, E extends OrangException> R accept(ExpressionVisitor<R, E> visitor) throws E {
                 return visitor.visitFnExpression(this);
diff --git a/ast/src/main/java/lv/enes/orang/ast/VoidExpression.java b/ast/src/main/java/lv/enes/orang/ast/VoidExpression.java
new file mode 100644
index 0000000..39d164d
--- /dev/null
+++ b/ast/src/main/java/lv/enes/orang/ast/VoidExpression.java
@@ -0,0 +1,14 @@
+package lv.enes.orang.ast;
+
+import lv.enes.orang.core.OrangException;
+
+public final class VoidExpression implements Expression {
+        public static final VoidExpression INSTANCE = new VoidExpression();
+
+        private VoidExpression() {}
+
+        @Override
+        public <R, E extends OrangException> R accept(ExpressionVisitor<R, E> visitor) throws E {
+                return visitor.visitVoidExpression();
+        }
+}