ast: implement to_string for int and double nodes

bshell/ast/double.c

@@ -1,6 +1,16 @@
+#include "../parse/token.h"
 #include "ast.h"
 
+#include <fx/stream.h>
+
+static void to_string(const struct ast_node *node, fx_bstr *out)
+{
+	struct double_ast_node *i = (struct double_ast_node *)node;
+	fx_value_to_string(&i->n_value->tok_number, (fx_stream *)out, NULL);
+}
+
 struct ast_node_definition double_ast_node = {
 	.def_id = AST_DOUBLE,
 	.def_node_size = sizeof(struct double_ast_node),
+	.def_to_string = to_string,
 };

bshell/ast/int.c

@@ -1,10 +1,12 @@
 #include "../parse/token.h"
 #include "ast.h"
 
+#include <fx/stream.h>
+
 static void to_string(const struct ast_node *node, fx_bstr *out)
 {
 	struct int_ast_node *i = (struct int_ast_node *)node;
-	fx_bstr_write_fmt(out, NULL, "%lld", i->n_value->tok_int);
+	fx_value_to_string(&i->n_value->tok_number, (fx_stream *)out, NULL);
 }
 
 struct ast_node_definition int_ast_node = {