1 files changed, 64 insertions, 0 deletions
diff --git a/vendor/logos-codegen/src/util.rs b/vendor/logos-codegen/src/util.rs
new file mode 100644
index 00000000..156de035
--- /dev/null
+++ b/vendor/logos-codegen/src/util.rs
@@ -0,0 +1,64 @@
+use proc_macro2::{Spacing, Span, TokenStream, TokenTree};
+use quote::{quote, ToTokens};
+use syn::Ident;
+
+/// Analog to Option<TokenStream>, except when put into the quote!
+/// macro, `MaybeVoid::Void` will produce `()`
+#[derive(Clone, Default)]
+pub enum MaybeVoid {
+    Some(TokenStream),
+    #[default]
+    Void,
+}
+
+impl MaybeVoid {
+    pub fn replace(&mut self, stream: TokenStream) -> MaybeVoid {
+        std::mem::replace(self, MaybeVoid::Some(stream))
+    }
+
+    pub fn take(&mut self) -> MaybeVoid {
+        std::mem::replace(self, MaybeVoid::Void)
+    }
+}
+
+impl ToTokens for MaybeVoid {
+    fn to_tokens(&self, out: &mut TokenStream) {
+        match self {
+            MaybeVoid::Some(stream) => out.extend(stream.clone()),
+            MaybeVoid::Void => out.extend(quote!(())),
+        }
+    }
+
+    fn to_token_stream(&self) -> TokenStream {
+        match self {
+            MaybeVoid::Some(stream) => stream.clone(),
+            MaybeVoid::Void => quote!(()),
+        }
+    }
+
+    fn into_token_stream(self) -> TokenStream {
+        match self {
+            MaybeVoid::Some(stream) => stream,
+            MaybeVoid::Void => quote!(()),
+        }
+    }
+}
+
+pub fn is_punct(tt: &TokenTree, expect: char) -> bool {
+    matches!(tt, TokenTree::Punct(punct) if punct.as_char() == expect && punct.spacing() == Spacing::Alone)
+}
+
+/// If supplied `tt` is a punct matching a char, returns `None`, else returns `tt`
+pub fn expect_punct(tt: Option<TokenTree>, expect: char) -> Option<TokenTree> {
+    tt.filter(|tt| !is_punct(tt, expect))
+}
+
+pub trait ToIdent {
+    fn to_ident(&self) -> Ident;
+}
+
+impl ToIdent for str {
+    fn to_ident(&self) -> Ident {
+        Ident::new(self, Span::call_site())
+    }
+}