fix escape sequence rendering

1 files changed, 16 insertions, 9 deletions

diff --git a/src/ast_render.cpp b/src/ast_render.cpp
index fe131ab65f..af134d29b5 100644
--- a/src/ast_render.cpp
+++ b/src/ast_render.cpp
@@ -319,6 +319,9 @@ static bool is_digit(uint8_t c) {
 }
 
 static bool is_printable(uint8_t c) {
+    if (c == 0) {
+        return false;
+    }
     static const uint8_t printables[] =
         " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.~`!@#$%^&*()_-+=\\{}[];'\"?/<>,:";
     for (size_t i = 0; i < array_length(printables); i += 1) {
@@ -337,20 +340,12 @@ static void string_literal_escape(Buf *source, Buf *dest) {
             buf_append_str(dest, "\\\"");
         } else if (c == '\\') {
             buf_append_str(dest, "\\\\");
-        } else if (c == '\a') {
-            buf_append_str(dest, "\\a");
-        } else if (c == '\b') {
-            buf_append_str(dest, "\\b");
-        } else if (c == '\f') {
-            buf_append_str(dest, "\\f");
         } else if (c == '\n') {
             buf_append_str(dest, "\\n");
         } else if (c == '\r') {
             buf_append_str(dest, "\\r");
         } else if (c == '\t') {
             buf_append_str(dest, "\\t");
-        } else if (c == '\v') {
-            buf_append_str(dest, "\\v");
         } else if (is_printable(c)) {
             buf_append_char(dest, c);
         } else {
@@ -630,7 +625,19 @@ static void render_node_extra(AstRender *ar, AstNode *node, bool grouped) {
         case NodeTypeCharLiteral:
             {
                 uint8_t c = node->data.char_literal.value;
-                if (is_printable(c)) {
+                if (c == '\'') {
+                    fprintf(ar->f, "'\\''");
+                } else if (c == '\"') {
+                    fprintf(ar->f, "'\\\"'");
+                } else if (c == '\\') {
+                    fprintf(ar->f, "'\\\\'");
+                } else if (c == '\n') {
+                    fprintf(ar->f, "'\\n'");
+                } else if (c == '\r') {
+                    fprintf(ar->f, "'\\r'");
+                } else if (c == '\t') {
+                    fprintf(ar->f, "'\\t'");
+                } else if (is_printable(c)) {
                     fprintf(ar->f, "'%c'", c);
                 } else {
                     fprintf(ar->f, "'\\x%02x'", (int)c);