Update mod.rs

meta/src/optimizer/mod.rs

@@ -266,9 +266,16 @@ pub struct OptimizedExprTopDownIterator {
 impl core::fmt::Display for OptimizedExpr {
  fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
  match self {
- OptimizedExpr::Str(s) => write!(f, "\"{}\"", s),
- OptimizedExpr::Insens(s) => write!(f, "^\"{}\"", s),
- OptimizedExpr::Range(start, end) => write!(f, "('{}'..'{}')", start, end),
+ OptimizedExpr::Str(s) => write!(f, "{:?}", s),
+ OptimizedExpr::Insens(s) => write!(f, "^{:?}", s),
+ OptimizedExpr::Range(start, end) => {
+ write!(
+ f,
+ "({:?}..{:?})",
+ start.chars().next().expect("Empty range start."),
+ end.chars().next().expect("Empty range end.")
+ )
+ }
  OptimizedExpr::Ident(id) => write!(f, "{}", id),
  OptimizedExpr::PeekSlice(start, end) => match end {
  Some(end) => write!(f, "PEEK[{}..{}]", start, end),
@@ -315,7 +322,7 @@ impl core::fmt::Display for OptimizedExpr {
  OptimizedExpr::Skip(strings) => {
  let strings = strings
  .iter()
- .map(|s| format!("\"{}\"", s))
+ .map(|s| format!("{:?}", s))
  .collect::<Vec<_>>()
  .join(" | ");
  write!(f, "(!({}) ~ ANY)*", strings)