From: Timm Bäder <mail@baedert.org>
Date: Mon, 7 Nov 2016 18:29:30 +0000 (+0100)
Subject: expression: Add get_null_state vfunc
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f56fae538f12060d650ac6781f3c57d79535a5c9;p=thirdparty%2Fvala.git

expression: Add get_null_state vfunc
---

diff --git a/vala/valaexpression.vala b/vala/valaexpression.vala
index 5f7a02333..28a536d81 100644
--- a/vala/valaexpression.vala
+++ b/vala/valaexpression.vala
@@ -22,6 +22,13 @@
 
 using GLib;
 
+
+public enum Vala.NullabilityState {
+	NULL,
+	NON_NULL,
+	NULLABLE
+}
+
 /**
  * Base class for all code nodes that might be used as an expression.
  */
@@ -71,6 +78,10 @@ public abstract class Vala.Expression : CodeNode {
 	 */
 	public abstract bool is_pure ();
 
+	public virtual NullabilityState get_null_state () {
+		return NullabilityState.NULLABLE;
+	}
+
 	/**
 	 * Returns whether this expression is guaranteed to be non-null.
 	 */
diff --git a/vala/valaliteral.vala b/vala/valaliteral.vala
index 62f17a3af..3550ff775 100644
--- a/vala/valaliteral.vala
+++ b/vala/valaliteral.vala
@@ -33,4 +33,8 @@ public abstract class Vala.Literal : Expression {
 	public override bool is_pure () {
 		return true;
 	}
+
+	public override NullabilityState get_null_state () {
+		return NullabilityState.NON_NULL;
+	}
 }
diff --git a/vala/valanullliteral.vala b/vala/valanullliteral.vala
index b5f95d064..015dd7e83 100644
--- a/vala/valanullliteral.vala
+++ b/vala/valanullliteral.vala
@@ -50,6 +50,10 @@ public class Vala.NullLiteral : Literal {
 		return true;
 	}
 
+	public override NullabilityState get_null_state () {
+		return NullabilityState.NULL;
+	}
+
 	public override bool check (CodeContext context) {
 		if (checked) {
 			return !error;