chore: add vendor directory

1 files changed, 358 insertions, 0 deletions

diff --git a/vendor/thiserror-impl/src/attr.rs b/vendor/thiserror-impl/src/attr.rs
new file mode 100644
index 00000000..7ad83e02
--- /dev/null
+++ b/vendor/thiserror-impl/src/attr.rs
@@ -0,0 +1,358 @@
+use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
+use quote::{format_ident, quote, quote_spanned, ToTokens};
+use std::collections::BTreeSet as Set;
+use syn::parse::discouraged::Speculative;
+use syn::parse::{End, ParseStream};
+use syn::{
+    braced, bracketed, parenthesized, token, Attribute, Error, ExprPath, Ident, Index, LitFloat,
+    LitInt, LitStr, Meta, Result, Token,
+};
+
+pub struct Attrs<'a> {
+    pub display: Option<Display<'a>>,
+    pub source: Option<Source<'a>>,
+    pub backtrace: Option<&'a Attribute>,
+    pub from: Option<From<'a>>,
+    pub transparent: Option<Transparent<'a>>,
+    pub fmt: Option<Fmt<'a>>,
+}
+
+#[derive(Clone)]
+pub struct Display<'a> {
+    pub original: &'a Attribute,
+    pub fmt: LitStr,
+    pub args: TokenStream,
+    pub requires_fmt_machinery: bool,
+    pub has_bonus_display: bool,
+    pub infinite_recursive: bool,
+    pub implied_bounds: Set<(usize, Trait)>,
+    pub bindings: Vec<(Ident, TokenStream)>,
+}
+
+#[derive(Copy, Clone)]
+pub struct Source<'a> {
+    pub original: &'a Attribute,
+    pub span: Span,
+}
+
+#[derive(Copy, Clone)]
+pub struct From<'a> {
+    pub original: &'a Attribute,
+    pub span: Span,
+}
+
+#[derive(Copy, Clone)]
+pub struct Transparent<'a> {
+    pub original: &'a Attribute,
+    pub span: Span,
+}
+
+#[derive(Clone)]
+pub struct Fmt<'a> {
+    pub original: &'a Attribute,
+    pub path: ExprPath,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)]
+pub enum Trait {
+    Debug,
+    Display,
+    Octal,
+    LowerHex,
+    UpperHex,
+    Pointer,
+    Binary,
+    LowerExp,
+    UpperExp,
+}
+
+pub fn get(input: &[Attribute]) -> Result<Attrs> {
+    let mut attrs = Attrs {
+        display: None,
+        source: None,
+        backtrace: None,
+        from: None,
+        transparent: None,
+        fmt: None,
+    };
+
+    for attr in input {
+        if attr.path().is_ident("error") {
+            parse_error_attribute(&mut attrs, attr)?;
+        } else if attr.path().is_ident("source") {
+            attr.meta.require_path_only()?;
+            if attrs.source.is_some() {
+                return Err(Error::new_spanned(attr, "duplicate #[source] attribute"));
+            }
+            let span = (attr.pound_token.span)
+                .join(attr.bracket_token.span.join())
+                .unwrap_or(attr.path().get_ident().unwrap().span());
+            attrs.source = Some(Source {
+                original: attr,
+                span,
+            });
+        } else if attr.path().is_ident("backtrace") {
+            attr.meta.require_path_only()?;
+            if attrs.backtrace.is_some() {
+                return Err(Error::new_spanned(attr, "duplicate #[backtrace] attribute"));
+            }
+            attrs.backtrace = Some(attr);
+        } else if attr.path().is_ident("from") {
+            match attr.meta {
+                Meta::Path(_) => {}
+                Meta::List(_) | Meta::NameValue(_) => {
+                    // Assume this is meant for derive_more crate or something.
+                    continue;
+                }
+            }
+            if attrs.from.is_some() {
+                return Err(Error::new_spanned(attr, "duplicate #[from] attribute"));
+            }
+            let span = (attr.pound_token.span)
+                .join(attr.bracket_token.span.join())
+                .unwrap_or(attr.path().get_ident().unwrap().span());
+            attrs.from = Some(From {
+                original: attr,
+                span,
+            });
+        }
+    }
+
+    Ok(attrs)
+}
+
+fn parse_error_attribute<'a>(attrs: &mut Attrs<'a>, attr: &'a Attribute) -> Result<()> {
+    mod kw {
+        syn::custom_keyword!(transparent);
+        syn::custom_keyword!(fmt);
+    }
+
+    attr.parse_args_with(|input: ParseStream| {
+        let lookahead = input.lookahead1();
+        let fmt = if lookahead.peek(LitStr) {
+            input.parse::<LitStr>()?
+        } else if lookahead.peek(kw::transparent) {
+            let kw: kw::transparent = input.parse()?;
+            if attrs.transparent.is_some() {
+                return Err(Error::new_spanned(
+                    attr,
+                    "duplicate #[error(transparent)] attribute",
+                ));
+            }
+            attrs.transparent = Some(Transparent {
+                original: attr,
+                span: kw.span,
+            });
+            return Ok(());
+        } else if lookahead.peek(kw::fmt) {
+            input.parse::<kw::fmt>()?;
+            input.parse::<Token![=]>()?;
+            let path: ExprPath = input.parse()?;
+            if attrs.fmt.is_some() {
+                return Err(Error::new_spanned(
+                    attr,
+                    "duplicate #[error(fmt = ...)] attribute",
+                ));
+            }
+            attrs.fmt = Some(Fmt {
+                original: attr,
+                path,
+            });
+            return Ok(());
+        } else {
+            return Err(lookahead.error());
+        };
+
+        let args = if input.is_empty() || input.peek(Token![,]) && input.peek2(End) {
+            input.parse::<Option<Token![,]>>()?;
+            TokenStream::new()
+        } else {
+            parse_token_expr(input, false)?
+        };
+
+        let requires_fmt_machinery = !args.is_empty();
+
+        let display = Display {
+            original: attr,
+            fmt,
+            args,
+            requires_fmt_machinery,
+            has_bonus_display: false,
+            infinite_recursive: false,
+            implied_bounds: Set::new(),
+            bindings: Vec::new(),
+        };
+        if attrs.display.is_some() {
+            return Err(Error::new_spanned(
+                attr,
+                "only one #[error(...)] attribute is allowed",
+            ));
+        }
+        attrs.display = Some(display);
+        Ok(())
+    })
+}
+
+fn parse_token_expr(input: ParseStream, mut begin_expr: bool) -> Result<TokenStream> {
+    let mut tokens = Vec::new();
+    while !input.is_empty() {
+        if input.peek(token::Group) {
+            let group: TokenTree = input.parse()?;
+            tokens.push(group);
+            begin_expr = false;
+            continue;
+        }
+
+        if begin_expr && input.peek(Token![.]) {
+            if input.peek2(Ident) {
+                input.parse::<Token![.]>()?;
+                begin_expr = false;
+                continue;
+            } else if input.peek2(LitInt) {
+                input.parse::<Token![.]>()?;
+                let int: Index = input.parse()?;
+                tokens.push({
+                    let ident = format_ident!("_{}", int.index, span = int.span);
+                    TokenTree::Ident(ident)
+                });
+                begin_expr = false;
+                continue;
+            } else if input.peek2(LitFloat) {
+                let ahead = input.fork();
+                ahead.parse::<Token![.]>()?;
+                let float: LitFloat = ahead.parse()?;
+                let repr = float.to_string();
+                let mut indices = repr.split('.').map(syn::parse_str::<Index>);
+                if let (Some(Ok(first)), Some(Ok(second)), None) =
+                    (indices.next(), indices.next(), indices.next())
+                {
+                    input.advance_to(&ahead);
+                    tokens.push({
+                        let ident = format_ident!("_{}", first, span = float.span());
+                        TokenTree::Ident(ident)
+                    });
+                    tokens.push({
+                        let mut punct = Punct::new('.', Spacing::Alone);
+                        punct.set_span(float.span());
+                        TokenTree::Punct(punct)
+                    });
+                    tokens.push({
+                        let mut literal = Literal::u32_unsuffixed(second.index);
+                        literal.set_span(float.span());
+                        TokenTree::Literal(literal)
+                    });
+                    begin_expr = false;
+                    continue;
+                }
+            }
+        }
+
+        begin_expr = input.peek(Token![break])
+            || input.peek(Token![continue])
+            || input.peek(Token![if])
+            || input.peek(Token![in])
+            || input.peek(Token![match])
+            || input.peek(Token![mut])
+            || input.peek(Token![return])
+            || input.peek(Token![while])
+            || input.peek(Token![+])
+            || input.peek(Token![&])
+            || input.peek(Token![!])
+            || input.peek(Token![^])
+            || input.peek(Token![,])
+            || input.peek(Token![/])
+            || input.peek(Token![=])
+            || input.peek(Token![>])
+            || input.peek(Token![<])
+            || input.peek(Token![|])
+            || input.peek(Token![%])
+            || input.peek(Token![;])
+            || input.peek(Token![*])
+            || input.peek(Token![-]);
+
+        let token: TokenTree = if input.peek(token::Paren) {
+            let content;
+            let delimiter = parenthesized!(content in input);
+            let nested = parse_token_expr(&content, true)?;
+            let mut group = Group::new(Delimiter::Parenthesis, nested);
+            group.set_span(delimiter.span.join());
+            TokenTree::Group(group)
+        } else if input.peek(token::Brace) {
+            let content;
+            let delimiter = braced!(content in input);
+            let nested = parse_token_expr(&content, true)?;
+            let mut group = Group::new(Delimiter::Brace, nested);
+            group.set_span(delimiter.span.join());
+            TokenTree::Group(group)
+        } else if input.peek(token::Bracket) {
+            let content;
+            let delimiter = bracketed!(content in input);
+            let nested = parse_token_expr(&content, true)?;
+            let mut group = Group::new(Delimiter::Bracket, nested);
+            group.set_span(delimiter.span.join());
+            TokenTree::Group(group)
+        } else {
+            input.parse()?
+        };
+        tokens.push(token);
+    }
+    Ok(TokenStream::from_iter(tokens))
+}
+
+impl ToTokens for Display<'_> {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        if self.infinite_recursive {
+            let span = self.fmt.span();
+            tokens.extend(quote_spanned! {span=>
+                #[warn(unconditional_recursion)]
+                fn _fmt() { _fmt() }
+            });
+        }
+
+        let fmt = &self.fmt;
+        let args = &self.args;
+
+        // Currently `write!(f, "text")` produces less efficient code than
+        // `f.write_str("text")`. We recognize the case when the format string
+        // has no braces and no interpolated values, and generate simpler code.
+        let write = if self.requires_fmt_machinery {
+            quote! {
+                ::core::write!(__formatter, #fmt #args)
+            }
+        } else {
+            quote! {
+                __formatter.write_str(#fmt)
+            }
+        };
+
+        tokens.extend(if self.bindings.is_empty() {
+            write
+        } else {
+            let locals = self.bindings.iter().map(|(local, _value)| local);
+            let values = self.bindings.iter().map(|(_local, value)| value);
+            quote! {
+                match (#(#values,)*) {
+                    (#(#locals,)*) => #write
+                }
+            }
+        });
+    }
+}
+
+impl ToTokens for Trait {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        let trait_name = match self {
+            Trait::Debug => "Debug",
+            Trait::Display => "Display",
+            Trait::Octal => "Octal",
+            Trait::LowerHex => "LowerHex",
+            Trait::UpperHex => "UpperHex",
+            Trait::Pointer => "Pointer",
+            Trait::Binary => "Binary",
+            Trait::LowerExp => "LowerExp",
+            Trait::UpperExp => "UpperExp",
+        };
+        let ident = Ident::new(trait_name, Span::call_site());
+        tokens.extend(quote!(::core::fmt::#ident));
+    }
+}