Ascii character code 127 (DEL) is not printable and must be quoted. (#5984)

This is a follow-up to #5823.

compiler/msgs.nim

@@ -543,7 +543,7 @@ var
 
 proc toCChar*(c: char): string =
   case c
-  of '\0'..'\x1F', '\x80'..'\xFF': result = '\\' & toOctal(c)
+  of '\0'..'\x1F', '\x7F'..'\xFF': result = '\\' & toOctal(c)
   of '\'', '\"', '\\', '?': result = '\\' & c
   else: result = $(c)
 

lib/pure/json.nim

@@ -1001,7 +1001,7 @@ proc escapeJson*(s: string; result: var string) =
   result.add("\"")
   for x in runes(s):
     var r = int(x)
-    if r >= 32 and r <= 127:
+    if r >= 32 and r <= 126:
       var c = chr(r)
       case c
       of '"': result.add("\\\"")

lib/pure/pegs.nim

@@ -371,7 +371,7 @@ proc esc(c: char, reserved = {'\0'..'\255'}): string =
   of '\a': result = "\\a"
   of '\\': result = "\\\\"
   of 'a'..'z', 'A'..'Z', '0'..'9', '_': result = $c
-  elif c < ' ' or c >= '\128': result = '\\' & $ord(c)
+  elif c < ' ' or c >= '\127': result = '\\' & $ord(c)
   elif c in reserved: result = '\\' & c
   else: result = $c
 

lib/pure/strutils.nim

@@ -1643,7 +1643,7 @@ proc escape*(s: string, prefix = "\"", suffix = "\""): string {.noSideEffect,
   ## * replaces any ``\`` by ``\\``
   ## * replaces any ``'`` by ``\'``
   ## * replaces any ``"`` by ``\"``
-  ## * replaces any other character in the set ``{'\0'..'\31', '\128'..'\255'}``
+  ## * replaces any other character in the set ``{'\0'..'\31', '\127'..'\255'}``
   ##   by ``\xHH`` where ``HH`` is its hexadecimal value.
   ## The procedure has been designed so that its output is usable for many
   ## different common syntaxes. The resulting string is prefixed with
@@ -1653,7 +1653,7 @@ proc escape*(s: string, prefix = "\"", suffix = "\""): string {.noSideEffect,
   result.add(prefix)
   for c in items(s):
     case c
-    of '\0'..'\31', '\128'..'\255':
+    of '\0'..'\31', '\127'..'\255':
       add(result, "\\x")
       add(result, toHex(ord(c), 2))
     of '\\': add(result, "\\\\")

lib/system/repr.nim

@@ -49,7 +49,7 @@ proc reprStrAux(result: var string, s: cstring; len: int) =
     of '"': add result, "\\\""
     of '\\': add result, "\\\\" # BUGFIX: forgotten
     of '\10': add result, "\\10\"\n\"" # " \n " # better readability
-    of '\128' .. '\255', '\0'..'\9', '\11'..'\31':
+    of '\127' .. '\255', '\0'..'\9', '\11'..'\31':
       add result, "\\" & reprInt(ord(c))
     else:
       result.add(c)
@@ -68,7 +68,7 @@ proc reprChar(x: char): string {.compilerRtl.} =
   case x
   of '"': add result, "\\\""
   of '\\': add result, "\\\\"
-  of '\128' .. '\255', '\0'..'\31': add result, "\\" & reprInt(ord(x))
+  of '\127' .. '\255', '\0'..'\31': add result, "\\" & reprInt(ord(x))
   else: add result, x
   add result, "\'"
 

lib/system/reprjs.nim

@@ -44,7 +44,7 @@ proc reprChar(x: char): string {.compilerRtl.} =
   case x
   of '"': add(result, "\\\"")
   of '\\': add(result, "\\\\")
-  of '\128'..'\255', '\0'..'\31': add( result, "\\" & reprInt(ord(x)) )
+  of '\127'..'\255', '\0'..'\31': add( result, "\\" & reprInt(ord(x)) )
   else: add(result, x)
   add(result, "\'")
 
@@ -56,7 +56,7 @@ proc reprStrAux(result: var string, s: cstring, len: int) =
     of '"': add(result, "\\\"")
     of '\\': add(result, "\\\\")
     of '\10': add(result, "\\10\"\n\"")
-    of '\128'..'\255', '\0'..'\9', '\11'..'\31':
+    of '\127'..'\255', '\0'..'\9', '\11'..'\31':
       add( result, "\\" & reprInt(ord(c)) )
     else:
       add( result, reprInt(ord(c)) ) # Not sure about this.