# lib.rs.html -- source
Source to the Rust file `/Users/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.3.15/src/lib.rs`.
Keywords: rust, rustlang, rust-lang

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    //! Quasi-quoting without a Syntex dependency, intended for use with [Macros
    //! 1.1](https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md).
    //!
    //! ```toml
    //! [dependencies]
    //! quote = "0.3"
    //! ```
    //!
    //! ```rust,ignore
    //! #[macro_use]
    //! extern crate quote;
    //! ```
    //!
    //! Interpolation is done with `#var`:
    //!
    //! ```text
    //! let tokens = quote! {
    //!     struct SerializeWith #generics #where_clause {
    //!         value: &'a #field_ty,
    //!         phantom: ::std::marker::PhantomData<#item_ty>,
    //!     }
    //!
    //!     impl #generics serde::Serialize for SerializeWith #generics #where_clause {
    //!         fn serialize<S>(&self, s: &mut S) -> Result<(), S::Error>
    //!             where S: serde::Serializer
    //!         {
    //!             #path(self.value, s)
    //!         }
    //!     }
    //!
    //!     SerializeWith {
    //!         value: #value,
    //!         phantom: ::std::marker::PhantomData::<#item_ty>,
    //!     }
    //! };
    //! ```
    //!
    //! Repetition is done using `#(...)*` or `#(...),*` very similar to `macro_rules!`:
    //!
    //! - `#(#var)*` - no separators
    //! - `#(#var),*` - the character before the asterisk is used as a separator
    //! - `#( struct #var; )*` - the repetition can contain other things
    //! - `#( #k => println!("{}", #v), )*` - even multiple interpolations
    //!
    //! The return type of `quote!` is `quote::Tokens`. Tokens can be interpolated into
    //! other quotes:
    //!
    //! ```text
    //! let t = quote! { /* ... */ };
    //! return quote! { /* ... */ #t /* ... */ };
    //! ```
    //!
    //! Call `to_string()` or `as_str()` on a Tokens to get a `String` or `&str` of Rust
    //! code.
    //!
    //! The `quote!` macro relies on deep recursion so some large invocations may fail
    //! with "recursion limit reached" when you compile. If it fails, bump up the
    //! recursion limit by adding `#![recursion_limit = "128"]` to your crate. An even
    //! higher limit may be necessary for especially large invocations.

    mod tokens;
    pub use tokens::Tokens;

    mod to_tokens;
    pub use to_tokens::{ToTokens, ByteStr, Hex};

    mod ident;
    pub use ident::Ident;

    /// The whole point.
    #[macro_export]
    macro_rules! quote {
        () => {
            $crate::Tokens::new()
        };

        ($($tt:tt)+) => {
            {
                let mut _s = $crate::Tokens::new();
                quote_each_token!(_s $($tt)*);
                _s
            }
        };
    }

    // Extract the names of all #metavariables and pass them to the $finish macro.
    //
    // in:   pounded_var_names!(then () a #b c #( #d )* #e)
    // out:  then!(() b d e)
    #[macro_export]
    #[doc(hidden)]
    macro_rules! pounded_var_names {
        ($finish:ident ($($found:ident)*) # ( $($inner:tt)* ) $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
        };

        ($finish:ident ($($found:ident)*) # [ $($inner:tt)* ] $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
        };

        ($finish:ident ($($found:ident)*) # { $($inner:tt)* } $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
        };

        ($finish:ident ($($found:ident)*) # $first:ident $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)* $first) $($rest)*)
        };

        ($finish:ident ($($found:ident)*) ( $($inner:tt)* ) $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
        };

        ($finish:ident ($($found:ident)*) [ $($inner:tt)* ] $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
        };

        ($finish:ident ($($found:ident)*) { $($inner:tt)* } $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
        };

        ($finish:ident ($($found:ident)*) $ignore:tt $($rest:tt)*) => {
            pounded_var_names!($finish ($($found)*) $($rest)*)
        };

        ($finish:ident ($($found:ident)*)) => {
            $finish!(() $($found)*)
        };
    }

    // in:   nested_tuples_pat!(() a b c d e)
    // out:  ((((a b) c) d) e)
    //
    // in:   nested_tuples_pat!(() a)
    // out:  a
    #[macro_export]
    #[doc(hidden)]
    macro_rules! nested_tuples_pat {
        (()) => {
            &()
        };

        (() $first:ident $($rest:ident)*) => {
            nested_tuples_pat!(($first) $($rest)*)
        };

        (($pat:pat) $first:ident $($rest:ident)*) => {
            nested_tuples_pat!((($pat, $first)) $($rest)*)
        };

        (($done:pat)) => {
            $done
        };
    }

    // in:   multi_zip_expr!(() a b c d e)
    // out:  a.into_iter().zip(b).zip(c).zip(d).zip(e)
    //
    // in:   multi_zip_iter!(() a)
    // out:  a
    #[macro_export]
    #[doc(hidden)]
    macro_rules! multi_zip_expr {
        (()) => {
            &[]
        };

        (() $single:ident) => {
            $single
        };

        (() $first:ident $($rest:ident)*) => {
            multi_zip_expr!(($first.into_iter()) $($rest)*)
        };

        (($zips:expr) $first:ident $($rest:ident)*) => {
            multi_zip_expr!(($zips.zip($first)) $($rest)*)
        };

        (($done:expr)) => {
            $done
        };
    }

    #[macro_export]
    #[doc(hidden)]
    macro_rules! quote_each_token {
        ($tokens:ident) => {};

        ($tokens:ident # ! $($rest:tt)*) => {
            $tokens.append("#");
            $tokens.append("!");
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident # ( $($inner:tt)* ) * $($rest:tt)*) => {
            for pounded_var_names!(nested_tuples_pat () $($inner)*)
            in pounded_var_names!(multi_zip_expr () $($inner)*) {
                quote_each_token!($tokens $($inner)*);
            }
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident # ( $($inner:tt)* ) $sep:tt * $($rest:tt)*) => {
            for (_i, pounded_var_names!(nested_tuples_pat () $($inner)*))
            in pounded_var_names!(multi_zip_expr () $($inner)*).into_iter().enumerate() {
                if _i > 0 {
                    $tokens.append(stringify!($sep));
                }
                quote_each_token!($tokens $($inner)*);
            }
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident # [ $($inner:tt)* ] $($rest:tt)*) => {
            $tokens.append("#");
            $tokens.append("[");
            quote_each_token!($tokens $($inner)*);
            $tokens.append("]");
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident # $first:ident $($rest:tt)*) => {
            $crate::ToTokens::to_tokens(&$first, &mut $tokens);
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident ( $($first:tt)* ) $($rest:tt)*) => {
            $tokens.append("(");
            quote_each_token!($tokens $($first)*);
            $tokens.append(")");
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident [ $($first:tt)* ] $($rest:tt)*) => {
            $tokens.append("[");
            quote_each_token!($tokens $($first)*);
            $tokens.append("]");
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident { $($first:tt)* } $($rest:tt)*) => {
            $tokens.append("{");
            quote_each_token!($tokens $($first)*);
            $tokens.append("}");
            quote_each_token!($tokens $($rest)*);
        };

        ($tokens:ident $first:tt $($rest:tt)*) => {
            $tokens.append(stringify!($first));
            quote_each_token!($tokens $($rest)*);
        };
    }

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