feat: enable_if

1 files changed, 13 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index cb967c2..3f27fa2 100644
--- a/eval.c
+++ b/eval.c
@@ -254,6 +254,18 @@ static enum RunStatus emit(struct Machine* machine, const struct Node* node)
     return RUN_DONE;
 }
 
+static enum RunStatus enable_if(struct Machine* machine, const struct Node* node)
+{
+    bool truth = false;
+    if (evaluate_condition(machine, node->first, &truth))
+        return RUN_FAILED;
+
+    if (!truth)
+        return RUN_DONE;
+
+    return execute(machine, node->body);
+}
+
 static enum RunStatus static_assert_statement(struct Machine* machine, const struct Node* node)
 {
     bool truth = false;
@@ -275,6 +287,7 @@ static enum RunStatus execute_one(struct Machine* machine, const struct Node* no
     {
         case STMT_DECLARE: return declare(machine, node);
         case STMT_UNDECLARE: return undeclare(machine, node);
+        case STMT_ENABLE_IF: return enable_if(machine, node);
         case STMT_EMIT: return emit(machine, node);
         case STMT_STATIC_ASSERT: return static_assert_statement(machine, node);
         default: break;