quote!

.gitignore

@@ -0,0 +1,2 @@
+/target
+/Cargo.lock

Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "quote"
+version = "0.1.0"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+
+[dependencies]

LICENSE-APACHE

@@ -0,0 +1,201 @@
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+limitations under the License.

LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2016 The Rust Project Developers
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,60 @@
+Dead Simple Rust Quasi-Quoting
+==============================
+
+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 = "0.1"
+```
+
+```rust
+#[macro_use]
+extern crate quote;
+```
+
+Interpolation is done with `#var`:
+
+```rust
+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 in one of three ways, similar to `macro_rules!` repetitions:
+
+- `#(var)*` - no separators
+- `#(var),*` - the character before the asterisk is used as a separator
+- `#(var;)*` - the character before the close paren is used as a terminator
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.

src/lib.rs

@@ -0,0 +1,85 @@
+mod tokens;
+pub use tokens::Tokens;
+
+mod to_tokens;
+pub use to_tokens::ToTokens;
+
+#[macro_export]
+macro_rules! quote {
+    ($($tt:tt)+) => {
+        {
+            #[allow(unused_imports)]
+            use $crate::ToTokens;
+            let mut _s = $crate::Tokens::new();
+            quote_each_token!(_s $($tt)*);
+            _s
+        }
+    };
+}
+
+#[macro_export]
+#[doc(hidden)]
+macro_rules! quote_each_token {
+    ($tokens:ident) => {};
+
+    ($tokens:ident # ! $($rest:tt)*) => {
+        $tokens.append("#!");
+        quote_each_token!($tokens $($rest)*);
+    };
+
+    ($tokens:ident # ( $first:ident ) * $($rest:tt)*) => {
+        for _v in &$first {
+            _v.to_tokens(&mut $tokens);
+        }
+        quote_each_token!($tokens $($rest)*);
+    };
+
+    ($tokens:ident # ( $first:ident $sep:tt ) * $($rest:tt)*) => {
+        for _v in &$first {
+            _v.to_tokens(&mut $tokens);
+            $tokens.append(stringify!($sep));
+        }
+        quote_each_token!($tokens $($rest)*);
+    };
+
+    ($tokens:ident # ( $first:ident ) $sep:tt * $($rest:tt)*) => {
+        for (_i, _v) in $first.iter().enumerate() {
+            if _i > 0 {
+                $tokens.append(stringify!($sep));
+            }
+            _v.to_tokens(&mut $tokens);
+        }
+        quote_each_token!($tokens $($rest)*);
+    };
+
+    ($tokens:ident # $first:ident $($rest:tt)*) => {
+        $first.to_tokens(&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)*);
+    };
+}

src/to_tokens.rs

@@ -0,0 +1,50 @@
+use super::Tokens;
+
+pub trait ToTokens {
+    fn to_tokens(&self, &mut Tokens);
+}
+
+impl<'a, T: ToTokens> ToTokens for &'a T {
+    fn to_tokens(&self, tokens: &mut Tokens) {
+        (**self).to_tokens(tokens);
+    }
+}
+
+impl<T: ToTokens> ToTokens for Option<T> {
+    fn to_tokens(&self, tokens: &mut Tokens) {
+        if let Some(ref t) = *self {
+            t.to_tokens(tokens);
+        }
+    }
+}
+
+impl ToTokens for str {
+    fn to_tokens(&self, tokens: &mut Tokens) {
+        tokens.append(&format!("{:?}", self));
+    }
+}
+
+macro_rules! impl_to_tokens_display {
+    ($ty:ty) => {
+        impl ToTokens for $ty {
+            fn to_tokens(&self, tokens: &mut Tokens) {
+                tokens.append(&self.to_string());
+            }
+        }
+    };
+}
+
+impl_to_tokens_display!(Tokens);
+impl_to_tokens_display!(bool);
+impl_to_tokens_display!(i8);
+impl_to_tokens_display!(i16);
+impl_to_tokens_display!(i32);
+impl_to_tokens_display!(i64);
+impl_to_tokens_display!(isize);
+impl_to_tokens_display!(u8);
+impl_to_tokens_display!(u16);
+impl_to_tokens_display!(u32);
+impl_to_tokens_display!(u64);
+impl_to_tokens_display!(usize);
+impl_to_tokens_display!(f32);
+impl_to_tokens_display!(f64);

src/tokens.rs

@@ -0,0 +1,27 @@
+use std::fmt::{self, Display};
+
+#[derive(Debug)]
+pub struct Tokens(String);
+
+impl Tokens {
+    pub fn new() -> Self {
+        Tokens(String::new())
+    }
+
+    pub fn append(&mut self, token: &str) {
+        self.0.push_str(token);
+        self.0.push(' ');
+    }
+}
+
+impl Default for Tokens {
+    fn default() -> Self {
+        Tokens::new()
+    }
+}
+
+impl Display for Tokens {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        self.0.fmt(formatter)
+    }
+}

tests/test.rs

@@ -0,0 +1,99 @@
+#[macro_use]
+extern crate quote;
+
+#[test]
+fn test_quote_impl() {
+    let tokens = quote!(
+        impl<'a, T: ToTokens> ToTokens for &'a T {
+            fn to_tokens(&self, tokens: &mut Tokens) {
+                (**self).to_tokens(tokens)
+            }
+        }
+    );
+
+    let expected = concat!(
+        "impl < 'a , T : ToTokens > ToTokens for & 'a T { ",
+            "fn to_tokens ( & self , tokens : & mut Tokens ) { ",
+                "( * * self ) . to_tokens ( tokens ) ",
+            "} ",
+        "} "
+    );
+
+    assert_eq!(expected, tokens.to_string());
+}
+
+#[test]
+fn test_substitution() {
+    let n = 1;
+    let tokens = quote!(#n <#n> (#n) [#n] {#n});
+
+    let expected = "1 < 1 > ( 1 ) [ 1 ] { 1 } ";
+
+    assert_eq!(expected, tokens.to_string());
+}
+
+#[test]
+fn test_iter() {
+    let primes = vec![2, 3, 5, 7];
+
+    assert_eq!("2 3 5 7 ", quote!(#(primes)*).to_string());
+
+    assert_eq!("2 , 3 , 5 , 7 , ", quote!(#(primes,)*).to_string());
+
+    assert_eq!("2 , 3 , 5 , 7 ", quote!(#(primes),*).to_string());
+}
+
+#[test]
+fn test_advanced() {
+    let generics = quote!( <'a, T> );
+
+    let where_clause = quote!( where T: Serialize );
+
+    let field_ty = quote!( String );
+
+    let item_ty = quote!( Cow<'a, str> );
+
+    let path = quote!( SomeTrait::serialize_with );
+
+    let value = quote!( self.x );
+
+    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>,
+        }
+    };
+
+    let expected = concat!(
+        "struct SerializeWith < 'a , T >  where T : Serialize  { ",
+            "value : & 'a String  , ",
+            "phantom : :: std :: marker :: PhantomData < Cow < 'a , str >  > , ",
+        "} ",
+        "impl < 'a , T >  :: serde :: Serialize for SerializeWith < 'a , T >  where T : Serialize  { ",
+            "fn serialize < S > ( & self , s : & mut S ) -> Result < ( ) , S :: Error > ",
+                "where S : :: serde :: Serializer ",
+            "{ ",
+                "SomeTrait :: serialize_with  ( self . value , s ) ",
+            "} ",
+        "} ",
+        "SerializeWith { ",
+            "value : self . x  , ",
+            "phantom : :: std :: marker :: PhantomData :: < Cow < 'a , str >  > , ",
+        "} "
+    );
+
+    assert_eq!(expected, tokens.to_string());
+}