fix: escape characters within assembly

src/main/wacc/frontend/lexer.scala

@@ -39,6 +39,17 @@ val errConfig = new ErrorConfig {
   )
 }
 object lexer {
+  val escapedChars: Map[String, Int] = Map(
+    "0" -> '\u0000',
+    "b" -> '\b',
+    "t" -> '\t',
+    "n" -> '\n',
+    "f" -> '\f',
+    "r" -> '\r',
+    "\\" -> '\\',
+    "'" -> '\'',
+    "\"" -> '\"'
+  )
 
   /** Language description for the WACC lexer
     */
@@ -63,15 +74,9 @@ object lexer {
     textDesc = TextDesc.plain.copy(
       graphicCharacter = Basic(c => c >= ' ' && c != '\\' && c != '\'' && c != '"'),
       escapeSequences = EscapeDesc.plain.copy(
-        literals = Set('\\', '"', '\''),
-        mapping = Map(
-          "0" -> '\u0000',
-          "b" -> '\b',
-          "t" -> '\t',
-          "n" -> '\n',
-          "f" -> '\f',
-          "r" -> '\r'
-        )
+        literals =
+          escapedChars.filter { (s, chr) => chr.toChar.toString == s }.map(_._2.toChar).toSet,
+        mapping = escapedChars.filter { (s, chr) => chr.toChar.toString != s }
       )
     ),
     numericDesc = NumericDesc.plain.copy(