From 715b42012fe447b9fbfff5ba803610fec2681ba6 Mon Sep 17 00:00:00 2001
From: Michael Dowling <mtdowling@gmail.com>
Date: Mon, 21 Mar 2022 12:35:25 -0700
Subject: [PATCH] Disallow #, ?, /, and ^ formatters

?, #, /, and ^ are used for conditions and loops. Reserving
~ for potentially controlling whitespace in the future.
---
 .../amazon/smithy/utils/CodeWriterFormatterContainer.java     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/smithy-utils/src/main/java/software/amazon/smithy/utils/CodeWriterFormatterContainer.java b/smithy-utils/src/main/java/software/amazon/smithy/utils/CodeWriterFormatterContainer.java
index 8819643a34f..e2dfffebba7 100644
--- a/smithy-utils/src/main/java/software/amazon/smithy/utils/CodeWriterFormatterContainer.java
+++ b/smithy-utils/src/main/java/software/amazon/smithy/utils/CodeWriterFormatterContainer.java
@@ -28,9 +28,9 @@ final class CodeWriterFormatterContainer {
 
     // Must be sorted for binary search to work.
     static final char[] VALID_FORMATTER_CHARS = {
-            '!', '#', '%', '&', '*', '+', ',', '-', '.', '/', ';', '=', '?', '@',
+            '!', '%', '&', '*', '+', ',', '-', '.', ';', '=', '@',
             'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
-            'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '^', '_', '`', '~'};
+            'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '_', '`'};
 
     private final Map<Character, BiFunction<Object, String, String>> formatters = new HashMap<>();
     private final CodeWriterFormatterContainer parent;