Rename directory "engines" to "languages"

languages/engine-utils.ts

@@ -0,0 +1,20 @@
+/**
+ * For given ASCII code, returns character that is safe to insert into code.
+ *
+ * This is useful for self-modifying programs that may insert non-printable characters into
+ * the source code at runtime. Characters like `\n`, `\r` and `Tab` distort the grid visually
+ * in the code editor. This function replaces such characters with safely printable alts. Other
+ * control characters will be safely rendered by the code editor.
+ *
+ * @param asciiVal ASCII value to get safe character for
+ * @returns Character safe to print without distorting code
+ */
+export const toSafePrintableChar = (asciiVal: number): string => {
+  // "\n" -> "⤶"
+  if (asciiVal === 10) return "\u21b5";
+  // "\r" -> "␍"
+  else if (asciiVal === 13) return "\u240d";
+  // Tab -> "⇆"
+  else if (asciiVal === 9) return "\u21c6";
+  else return String.fromCharCode(asciiVal);
+};