vala: Allow direct access to the integer constants of an error-domain

Fixes https://gitlab.gnome.org/GNOME/vala/issues/732

4 files changed, 56 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3594ebe3e..9ad4e4061 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -363,6 +363,7 @@ TESTS = \
 	objects/bug795521.vala \
 	errors/catch-error-code.vala \
 	errors/errors.vala \
+	errors/errorcode.vala \
 	errors/errordomain.vala \
 	errors/invalid-type-check.test \
 	errors/method-throws.vala \
diff --git a/tests/errors/errorcode.vala b/tests/errors/errorcode.vala
new file mode 100644
index 000000000..2cb96ec67
--- /dev/null
+++ b/tests/errors/errorcode.vala
@@ -0,0 +1,32 @@
+errordomain FooError {
+	REALLY_BAD,
+	NOT_SO_GOOD,
+	EVEN_WORSE = 23
+}
+
+void main () {
+	{
+		var error = new IOError.NO_SPACE ("foo");
+		assert (error.code == 12);
+	}
+	{
+		var code = IOError.NO_SPACE;
+		assert (code == 12);
+	}
+	{
+		var error = new FooError.NOT_SO_GOOD ("foo");
+		assert (error.code == 1);
+	}
+	{
+		var code = FooError.NOT_SO_GOOD;
+		assert (code == 1);
+	}
+	{
+		var error = new FooError.EVEN_WORSE ("foo");
+		assert (error.code == 23);
+	}
+	{
+		var code = FooError.EVEN_WORSE;
+		assert (code == 23);
+	}
+}
diff --git a/vala/valaerrorcode.vala b/vala/valaerrorcode.vala
index ef5f36410..3e3c57b37 100644
--- a/vala/valaerrorcode.vala
+++ b/vala/valaerrorcode.vala
@@ -39,7 +39,23 @@ public class Vala.ErrorCode : TypeSymbol {
 		}
 	}
 
+	/**
+	 * Refers to the enum value of this error code for direct access.
+	 */
+	public Constant code {
+		get {
+			return _code;
+		}
+		private set {
+			_code = value;
+			if (_code != null) {
+				_code.owner = owner;
+			}
+		}
+	}
+
 	private Expression _value;
+	private Constant _code;
 
 	/**
 	 * Creates a new enum value.
@@ -84,6 +100,10 @@ public class Vala.ErrorCode : TypeSymbol {
 			value.check (context);
 		}
 
+		code = new Constant (name, context.analyzer.int_type.copy (), null, source_reference, comment);
+		code.external = true;
+		code.check (context);
+
 		return !error;
 	}
 }
diff --git a/vala/valamemberaccess.vala b/vala/valamemberaccess.vala
index 09faed946..4b131ae47 100644
--- a/vala/valamemberaccess.vala
+++ b/vala/valamemberaccess.vala
@@ -703,6 +703,9 @@ public class Vala.MemberAccess : Expression {
 		} else if (member is Signal) {
 			instance = true;
 			access = member.access;
+		} else if (!creation_member && member is ErrorCode) {
+			symbol_reference = ((ErrorCode) member).code;
+			member = symbol_reference;
 		}
 
 		member.used = true;