Deleted vendor folder

1 files changed, 0 insertions, 432 deletions

diff --git a/vendor/syn/src/buffer.rs b/vendor/syn/src/buffer.rs
deleted file mode 100644
index 86dec46..0000000
--- a/vendor/syn/src/buffer.rs
+++ /dev/null
@@ -1,432 +0,0 @@
-//! A stably addressed token buffer supporting efficient traversal based on a
-//! cheaply copyable cursor.
-
-// This module is heavily commented as it contains most of the unsafe code in
-// Syn, and caution should be used when editing it. The public-facing interface
-// is 100% safe but the implementation is fragile internally.
-
-use crate::Lifetime;
-use proc_macro2::extra::DelimSpan;
-use proc_macro2::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
-use std::cmp::Ordering;
-use std::marker::PhantomData;
-
-/// Internal type which is used instead of `TokenTree` to represent a token tree
-/// within a `TokenBuffer`.
-enum Entry {
-    // Mimicking types from proc-macro.
-    // Group entries contain the offset to the matching End entry.
-    Group(Group, usize),
-    Ident(Ident),
-    Punct(Punct),
-    Literal(Literal),
-    // End entries contain the offset (negative) to the start of the buffer.
-    End(isize),
-}
-
-/// A buffer that can be efficiently traversed multiple times, unlike
-/// `TokenStream` which requires a deep copy in order to traverse more than
-/// once.
-pub struct TokenBuffer {
-    // NOTE: Do not implement clone on this - while the current design could be
-    // cloned, other designs which could be desirable may not be cloneable.
-    entries: Box<[Entry]>,
-}
-
-impl TokenBuffer {
-    fn recursive_new(entries: &mut Vec<Entry>, stream: TokenStream) {
-        for tt in stream {
-            match tt {
-                TokenTree::Ident(ident) => entries.push(Entry::Ident(ident)),
-                TokenTree::Punct(punct) => entries.push(Entry::Punct(punct)),
-                TokenTree::Literal(literal) => entries.push(Entry::Literal(literal)),
-                TokenTree::Group(group) => {
-                    let group_start_index = entries.len();
-                    entries.push(Entry::End(0)); // we replace this below
-                    Self::recursive_new(entries, group.stream());
-                    let group_end_index = entries.len();
-                    entries.push(Entry::End(-(group_end_index as isize)));
-                    let group_end_offset = group_end_index - group_start_index;
-                    entries[group_start_index] = Entry::Group(group, group_end_offset);
-                }
-            }
-        }
-    }
-
-    /// Creates a `TokenBuffer` containing all the tokens from the input
-    /// `proc_macro::TokenStream`.
-    #[cfg(feature = "proc-macro")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "proc-macro")))]
-    pub fn new(stream: proc_macro::TokenStream) -> Self {
-        Self::new2(stream.into())
-    }
-
-    /// Creates a `TokenBuffer` containing all the tokens from the input
-    /// `proc_macro2::TokenStream`.
-    pub fn new2(stream: TokenStream) -> Self {
-        let mut entries = Vec::new();
-        Self::recursive_new(&mut entries, stream);
-        entries.push(Entry::End(-(entries.len() as isize)));
-        Self {
-            entries: entries.into_boxed_slice(),
-        }
-    }
-
-    /// Creates a cursor referencing the first token in the buffer and able to
-    /// traverse until the end of the buffer.
-    pub fn begin(&self) -> Cursor {
-        let ptr = self.entries.as_ptr();
-        unsafe { Cursor::create(ptr, ptr.add(self.entries.len() - 1)) }
-    }
-}
-
-/// A cheaply copyable cursor into a `TokenBuffer`.
-///
-/// This cursor holds a shared reference into the immutable data which is used
-/// internally to represent a `TokenStream`, and can be efficiently manipulated
-/// and copied around.
-///
-/// An empty `Cursor` can be created directly, or one may create a `TokenBuffer`
-/// object and get a cursor to its first token with `begin()`.
-pub struct Cursor<'a> {
-    // The current entry which the `Cursor` is pointing at.
-    ptr: *const Entry,
-    // This is the only `Entry::End` object which this cursor is allowed to
-    // point at. All other `End` objects are skipped over in `Cursor::create`.
-    scope: *const Entry,
-    // Cursor is covariant in 'a. This field ensures that our pointers are still
-    // valid.
-    marker: PhantomData<&'a Entry>,
-}
-
-impl<'a> Cursor<'a> {
-    /// Creates a cursor referencing a static empty TokenStream.
-    pub fn empty() -> Self {
-        // It's safe in this situation for us to put an `Entry` object in global
-        // storage, despite it not actually being safe to send across threads
-        // (`Ident` is a reference into a thread-local table). This is because
-        // this entry never includes a `Ident` object.
-        //
-        // This wrapper struct allows us to break the rules and put a `Sync`
-        // object in global storage.
-        struct UnsafeSyncEntry(Entry);
-        unsafe impl Sync for UnsafeSyncEntry {}
-        static EMPTY_ENTRY: UnsafeSyncEntry = UnsafeSyncEntry(Entry::End(0));
-
-        Cursor {
-            ptr: &EMPTY_ENTRY.0,
-            scope: &EMPTY_ENTRY.0,
-            marker: PhantomData,
-        }
-    }
-
-    /// This create method intelligently exits non-explicitly-entered
-    /// `None`-delimited scopes when the cursor reaches the end of them,
-    /// allowing for them to be treated transparently.
-    unsafe fn create(mut ptr: *const Entry, scope: *const Entry) -> Self {
-        // NOTE: If we're looking at a `End`, we want to advance the cursor
-        // past it, unless `ptr == scope`, which means that we're at the edge of
-        // our cursor's scope. We should only have `ptr != scope` at the exit
-        // from None-delimited groups entered with `ignore_none`.
-        while let Entry::End(_) = unsafe { &*ptr } {
-            if ptr == scope {
-                break;
-            }
-            ptr = unsafe { ptr.add(1) };
-        }
-
-        Cursor {
-            ptr,
-            scope,
-            marker: PhantomData,
-        }
-    }
-
-    /// Get the current entry.
-    fn entry(self) -> &'a Entry {
-        unsafe { &*self.ptr }
-    }
-
-    /// Bump the cursor to point at the next token after the current one. This
-    /// is undefined behavior if the cursor is currently looking at an
-    /// `Entry::End`.
-    ///
-    /// If the cursor is looking at an `Entry::Group`, the bumped cursor will
-    /// point at the first token in the group (with the same scope end).
-    unsafe fn bump_ignore_group(self) -> Cursor<'a> {
-        unsafe { Cursor::create(self.ptr.offset(1), self.scope) }
-    }
-
-    /// While the cursor is looking at a `None`-delimited group, move it to look
-    /// at the first token inside instead. If the group is empty, this will move
-    /// the cursor past the `None`-delimited group.
-    ///
-    /// WARNING: This mutates its argument.
-    fn ignore_none(&mut self) {
-        while let Entry::Group(group, _) = self.entry() {
-            if group.delimiter() == Delimiter::None {
-                unsafe { *self = self.bump_ignore_group() };
-            } else {
-                break;
-            }
-        }
-    }
-
-    /// Checks whether the cursor is currently pointing at the end of its valid
-    /// scope.
-    pub fn eof(self) -> bool {
-        // We're at eof if we're at the end of our scope.
-        self.ptr == self.scope
-    }
-
-    /// If the cursor is pointing at a `Group` with the given delimiter, returns
-    /// a cursor into that group and one pointing to the next `TokenTree`.
-    pub fn group(mut self, delim: Delimiter) -> Option<(Cursor<'a>, DelimSpan, Cursor<'a>)> {
-        // If we're not trying to enter a none-delimited group, we want to
-        // ignore them. We have to make sure to _not_ ignore them when we want
-        // to enter them, of course. For obvious reasons.
-        if delim != Delimiter::None {
-            self.ignore_none();
-        }
-
-        if let Entry::Group(group, end_offset) = self.entry() {
-            if group.delimiter() == delim {
-                let span = group.delim_span();
-                let end_of_group = unsafe { self.ptr.add(*end_offset) };
-                let inside_of_group = unsafe { Cursor::create(self.ptr.add(1), end_of_group) };
-                let after_group = unsafe { Cursor::create(end_of_group, self.scope) };
-                return Some((inside_of_group, span, after_group));
-            }
-        }
-
-        None
-    }
-
-    pub(crate) fn any_group(self) -> Option<(Cursor<'a>, Delimiter, DelimSpan, Cursor<'a>)> {
-        if let Entry::Group(group, end_offset) = self.entry() {
-            let delimiter = group.delimiter();
-            let span = group.delim_span();
-            let end_of_group = unsafe { self.ptr.add(*end_offset) };
-            let inside_of_group = unsafe { Cursor::create(self.ptr.add(1), end_of_group) };
-            let after_group = unsafe { Cursor::create(end_of_group, self.scope) };
-            return Some((inside_of_group, delimiter, span, after_group));
-        }
-
-        None
-    }
-
-    pub(crate) fn any_group_token(self) -> Option<(Group, Cursor<'a>)> {
-        if let Entry::Group(group, end_offset) = self.entry() {
-            let end_of_group = unsafe { self.ptr.add(*end_offset) };
-            let after_group = unsafe { Cursor::create(end_of_group, self.scope) };
-            return Some((group.clone(), after_group));
-        }
-
-        None
-    }
-
-    /// If the cursor is pointing at a `Ident`, returns it along with a cursor
-    /// pointing at the next `TokenTree`.
-    pub fn ident(mut self) -> Option<(Ident, Cursor<'a>)> {
-        self.ignore_none();
-        match self.entry() {
-            Entry::Ident(ident) => Some((ident.clone(), unsafe { self.bump_ignore_group() })),
-            _ => None,
-        }
-    }
-
-    /// If the cursor is pointing at a `Punct`, returns it along with a cursor
-    /// pointing at the next `TokenTree`.
-    pub fn punct(mut self) -> Option<(Punct, Cursor<'a>)> {
-        self.ignore_none();
-        match self.entry() {
-            Entry::Punct(punct) if punct.as_char() != '\'' => {
-                Some((punct.clone(), unsafe { self.bump_ignore_group() }))
-            }
-            _ => None,
-        }
-    }
-
-    /// If the cursor is pointing at a `Literal`, return it along with a cursor
-    /// pointing at the next `TokenTree`.
-    pub fn literal(mut self) -> Option<(Literal, Cursor<'a>)> {
-        self.ignore_none();
-        match self.entry() {
-            Entry::Literal(literal) => Some((literal.clone(), unsafe { self.bump_ignore_group() })),
-            _ => None,
-        }
-    }
-
-    /// If the cursor is pointing at a `Lifetime`, returns it along with a
-    /// cursor pointing at the next `TokenTree`.
-    pub fn lifetime(mut self) -> Option<(Lifetime, Cursor<'a>)> {
-        self.ignore_none();
-        match self.entry() {
-            Entry::Punct(punct) if punct.as_char() == '\'' && punct.spacing() == Spacing::Joint => {
-                let next = unsafe { self.bump_ignore_group() };
-                let (ident, rest) = next.ident()?;
-                let lifetime = Lifetime {
-                    apostrophe: punct.span(),
-                    ident,
-                };
-                Some((lifetime, rest))
-            }
-            _ => None,
-        }
-    }
-
-    /// Copies all remaining tokens visible from this cursor into a
-    /// `TokenStream`.
-    pub fn token_stream(self) -> TokenStream {
-        let mut tts = Vec::new();
-        let mut cursor = self;
-        while let Some((tt, rest)) = cursor.token_tree() {
-            tts.push(tt);
-            cursor = rest;
-        }
-        tts.into_iter().collect()
-    }
-
-    /// If the cursor is pointing at a `TokenTree`, returns it along with a
-    /// cursor pointing at the next `TokenTree`.
-    ///
-    /// Returns `None` if the cursor has reached the end of its stream.
-    ///
-    /// This method does not treat `None`-delimited groups as transparent, and
-    /// will return a `Group(None, ..)` if the cursor is looking at one.
-    pub fn token_tree(self) -> Option<(TokenTree, Cursor<'a>)> {
-        let (tree, len) = match self.entry() {
-            Entry::Group(group, end_offset) => (group.clone().into(), *end_offset),
-            Entry::Literal(literal) => (literal.clone().into(), 1),
-            Entry::Ident(ident) => (ident.clone().into(), 1),
-            Entry::Punct(punct) => (punct.clone().into(), 1),
-            Entry::End(_) => return None,
-        };
-
-        let rest = unsafe { Cursor::create(self.ptr.add(len), self.scope) };
-        Some((tree, rest))
-    }
-
-    /// Returns the `Span` of the current token, or `Span::call_site()` if this
-    /// cursor points to eof.
-    pub fn span(self) -> Span {
-        match self.entry() {
-            Entry::Group(group, _) => group.span(),
-            Entry::Literal(literal) => literal.span(),
-            Entry::Ident(ident) => ident.span(),
-            Entry::Punct(punct) => punct.span(),
-            Entry::End(_) => Span::call_site(),
-        }
-    }
-
-    /// Returns the `Span` of the token immediately prior to the position of
-    /// this cursor, or of the current token if there is no previous one.
-    #[cfg(any(feature = "full", feature = "derive"))]
-    pub(crate) fn prev_span(mut self) -> Span {
-        if start_of_buffer(self) < self.ptr {
-            self.ptr = unsafe { self.ptr.offset(-1) };
-            if let Entry::End(_) = self.entry() {
-                // Locate the matching Group begin token.
-                let mut depth = 1;
-                loop {
-                    self.ptr = unsafe { self.ptr.offset(-1) };
-                    match self.entry() {
-                        Entry::Group(group, _) => {
-                            depth -= 1;
-                            if depth == 0 {
-                                return group.span();
-                            }
-                        }
-                        Entry::End(_) => depth += 1,
-                        Entry::Literal(_) | Entry::Ident(_) | Entry::Punct(_) => {}
-                    }
-                }
-            }
-        }
-        self.span()
-    }
-
-    /// Skip over the next token without cloning it. Returns `None` if this
-    /// cursor points to eof.
-    ///
-    /// This method treats `'lifetimes` as a single token.
-    pub(crate) fn skip(self) -> Option<Cursor<'a>> {
-        let len = match self.entry() {
-            Entry::End(_) => return None,
-
-            // Treat lifetimes as a single tt for the purposes of 'skip'.
-            Entry::Punct(punct) if punct.as_char() == '\'' && punct.spacing() == Spacing::Joint => {
-                match unsafe { &*self.ptr.add(1) } {
-                    Entry::Ident(_) => 2,
-                    _ => 1,
-                }
-            }
-
-            Entry::Group(_, end_offset) => *end_offset,
-            _ => 1,
-        };
-
-        Some(unsafe { Cursor::create(self.ptr.add(len), self.scope) })
-    }
-}
-
-impl<'a> Copy for Cursor<'a> {}
-
-impl<'a> Clone for Cursor<'a> {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-impl<'a> Eq for Cursor<'a> {}
-
-impl<'a> PartialEq for Cursor<'a> {
-    fn eq(&self, other: &Self) -> bool {
-        self.ptr == other.ptr
-    }
-}
-
-impl<'a> PartialOrd for Cursor<'a> {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        if same_buffer(*self, *other) {
-            Some(cmp_assuming_same_buffer(*self, *other))
-        } else {
-            None
-        }
-    }
-}
-
-pub(crate) fn same_scope(a: Cursor, b: Cursor) -> bool {
-    a.scope == b.scope
-}
-
-pub(crate) fn same_buffer(a: Cursor, b: Cursor) -> bool {
-    start_of_buffer(a) == start_of_buffer(b)
-}
-
-fn start_of_buffer(cursor: Cursor) -> *const Entry {
-    unsafe {
-        match &*cursor.scope {
-            Entry::End(offset) => cursor.scope.offset(*offset),
-            _ => unreachable!(),
-        }
-    }
-}
-
-pub(crate) fn cmp_assuming_same_buffer(a: Cursor, b: Cursor) -> Ordering {
-    a.ptr.cmp(&b.ptr)
-}
-
-pub(crate) fn open_span_of_group(cursor: Cursor) -> Span {
-    match cursor.entry() {
-        Entry::Group(group, _) => group.span_open(),
-        _ => cursor.span(),
-    }
-}
-
-pub(crate) fn close_span_of_group(cursor: Cursor) -> Span {
-    match cursor.entry() {
-        Entry::Group(group, _) => group.span_close(),
-        _ => cursor.span(),
-    }
-}