add trailing closures

+ Useful for guard statements, not entirely sure about the final syntax
  but at least they're possible

1 files changed, 16 insertions, 1 deletions

diff --git a/src/lower.c b/src/lower.c
index 35d16fe..4b9fae9 100644
--- a/src/lower.c
+++ b/src/lower.c
@@ -123,6 +123,11 @@ static int lower_type_construct(struct type *type)
 
 static int lower_type_callable(struct type *type)
 {
+	/* std::function has a slight overhead compared to just using auto here,
+	 * but auto doesn't play well with recursive templates like with our
+	 * fib.fwd example, so use std::function for now. Eventually I might
+	 * instead write a C backend or something to have more control over the
+	 * exact semantics, but for now this is good enough. */
 	printf("std::function<void(");
 
 	if (lower_types(tcallable_args(type)))
@@ -317,8 +322,10 @@ static int lower_if(struct state *state, struct ast *stmt)
 	if (lower_block(state, if_body(stmt)))
 		return -1;
 
-	if (!if_else(stmt))
+	if (!if_else(stmt)) {
+		printf("\n");
 		return 0;
+	}
 
 	printf(" else ");
 	if (lower_block(state, if_else(stmt)))
@@ -403,6 +410,11 @@ static int lower_closure(struct state *state, struct ast *closure)
 
 static int lower_proto(struct ast *proc)
 {
+	/* 'extern' functions should be provided to us by whatever framework the
+	 * user is using */
+	if (!proc_body(proc))
+		return 0;
+
 	if (strcmp("main", proc_id(proc)) == 0)
 		printf("int ");
 	else
@@ -419,6 +431,9 @@ static int lower_proto(struct ast *proc)
 
 static int lower_proc(struct ast *proc)
 {
+	if (!proc_body(proc))
+		return 0;
+
 	if (strcmp("main", proc_id(proc)) == 0)
 		printf("int ");
 	else