lib: move Slice, ScalarStyle, StreamEncoding enums

from lib/token to event/types, and add Copy derives for ScalarStyle +
StreamEncoding.

src/event/types.rs

@@ -11,9 +11,11 @@ use std::{array::IntoIter as ArrayIter, borrow::Cow, collections::HashMap};
 
 use crate::{
     scanner::{entry::Lazy, error::ScanResult},
-    token::{ScalarStyle, Slice, StreamEncoding, Token},
+    token::Token,
 };
 
+pub type Slice<'a> = std::borrow::Cow<'a, str>;
+
 pub const DEFAULT_TAGS: [(Slice<'static>, Slice<'static>); 2] = [
     (Cow::Borrowed("!"), Cow::Borrowed("!")),
     (Cow::Borrowed("!!"), Cow::Borrowed("tag:yaml.org,2002:")),
@@ -352,3 +354,19 @@ pub struct VersionDirective
 /// Typedef map of tag directives present in the current
 /// document
 pub type TagDirectives<'de> = HashMap<Slice<'de>, Slice<'de>>;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum StreamEncoding
+{
+    UTF8,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ScalarStyle
+{
+    Plain,
+    SingleQuote,
+    DoubleQuote,
+    Literal,
+    Folded,
+}

src/token.rs

@@ -4,7 +4,7 @@
  * was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-pub type Slice<'a> = std::borrow::Cow<'a, str>;
+pub use crate::event::types::{ScalarStyle, Slice, StreamEncoding};
 
 /// Tokens that may be emitted by a YAML scanner
 #[derive(Debug, PartialEq)]
@@ -199,19 +199,3 @@ impl PartialEq<Token<'_>> for Marker
         self == &Self::from(other)
     }
 }
-
-#[derive(Debug, Clone, PartialEq)]
-pub enum StreamEncoding
-{
-    UTF8,
-}
-
-#[derive(Debug, Clone, PartialEq)]
-pub enum ScalarStyle
-{
-    Plain,
-    SingleQuote,
-    DoubleQuote,
-    Literal,
-    Folded,
-}