Expand conditional primitive to choose between `then` and `else` branch

i.e. `1 if true then false else` evaluates to `true`, `0 if true then
false else` evaluates to `false`.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/primitives/impl.d b/src/primitives/impl.d
index 56ea4ce..cac3e64 100644
--- a/src/primitives/impl.d
+++ b/src/primitives/impl.d
@@ -31,7 +31,7 @@ bool unary_op_variable_resolve() {
 	return true;
 }
 
-bool conditional_start() {
+bool conditional_if() {
 	switch ( stack.pop.get!int ) {
 		case 0:
 			drop_mode = true;
@@ -44,7 +44,12 @@ bool conditional_start() {
 	}
 }
 
-bool conditional_end() {
+bool conditional_then() {
+	drop_mode = !drop_mode;
+	return true;
+}
+
+bool conditional_else() {
 	drop_mode = false;
 	return true;
 }