test.rs

#![allow(
    clippy::disallowed_names,
    clippy::let_underscore_untyped,
    clippy::shadow_unrelated,
    clippy::unseparated_literal_suffix,
    clippy::used_underscore_binding
)]

extern crate proc_macro;

use proc_macro2::{Delimiter, Group, Ident, Span, TokenStream};
use quote::{format_ident, quote, quote_spanned, TokenStreamExt};
use std::borrow::Cow;
use std::collections::BTreeSet;
use std::ffi::{CStr, CString};

struct X;

impl quote::ToTokens for X {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.append(Ident::new("X", Span::call_site()));
    }
}

#[test]
fn test_quote_impl() {
    let tokens = quote! {
        impl<'a, T: ToTokens> ToTokens for &'a T {
            fn to_tokens(&self, tokens: &mut TokenStream) {
                (**self).to_tokens(tokens)
            }
        }
    };

    let expected = concat!(
        "impl < 'a , T : ToTokens > ToTokens for & 'a T { ",
        "fn to_tokens (& self , tokens : & mut TokenStream) { ",
        "(* * self) . to_tokens (tokens) ",
        "} ",
        "}"
    );

    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_quote_spanned_impl() {
    let span = Span::call_site();
    let tokens = quote_spanned! {span=>
        impl<'a, T: ToTokens> ToTokens for &'a T {
            fn to_tokens(&self, tokens: &mut TokenStream) {
                (**self).to_tokens(tokens)
            }
        }
    };

    let expected = concat!(
        "impl < 'a , T : ToTokens > ToTokens for & 'a T { ",
        "fn to_tokens (& self , tokens : & mut TokenStream) { ",
        "(* * self) . to_tokens (tokens) ",
        "} ",
        "}"
    );

    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_substitution() {
    let x = X;
    let tokens = quote!(#x <#x> (#x) [#x] {#x});

    let expected = "X < X > (X) [X] { X }";

    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_iter() {
    let primes = &[X, X, X, X];

    assert_eq!("X X X X", quote!(#(#primes)*).to_string());

    assert_eq!("X , X , X , X ,", quote!(#(#primes,)*).to_string());

    assert_eq!("X , X , X , X", quote!(#(#primes),*).to_string());
}

#[test]
fn test_array() {
    let array: [u8; 40] = [0; 40];
    let _ = quote!(#(#array #array)*);

    let ref_array: &[u8; 40] = &[0; 40];
    let _ = quote!(#(#ref_array #ref_array)*);

    let ref_slice: &[u8] = &[0; 40];
    let _ = quote!(#(#ref_slice #ref_slice)*);

    let array: [X; 2] = [X, X]; // !Copy
    let _ = quote!(#(#array #array)*);

    let ref_array: &[X; 2] = &[X, X];
    let _ = quote!(#(#ref_array #ref_array)*);

    let ref_slice: &[X] = &[X, X];
    let _ = quote!(#(#ref_slice #ref_slice)*);

    let array_of_array: [[u8; 2]; 2] = [[0; 2]; 2];
    let _ = quote!(#(#(#array_of_array)*)*);
}

#[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());
}

#[test]
fn test_integer() {
    let ii8 = -1i8;
    let ii16 = -1i16;
    let ii32 = -1i32;
    let ii64 = -1i64;
    let ii128 = -1i128;
    let iisize = -1isize;
    let uu8 = 1u8;
    let uu16 = 1u16;
    let uu32 = 1u32;
    let uu64 = 1u64;
    let uu128 = 1u128;
    let uusize = 1usize;

    let tokens = quote! {
        1 1i32 1u256
        #ii8 #ii16 #ii32 #ii64 #ii128 #iisize
        #uu8 #uu16 #uu32 #uu64 #uu128 #uusize
    };
    let expected =
        "1 1i32 1u256 - 1i8 - 1i16 - 1i32 - 1i64 - 1i128 - 1isize 1u8 1u16 1u32 1u64 1u128 1usize";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_floating() {
    let e32 = 2.345f32;

    let e64 = 2.345f64;

    let tokens = quote! {
        #e32
        #e64
    };
    let expected = concat!("2.345f32 2.345f64");
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_char() {
    let zero = '\u{1}';
    let pound = '#';
    let quote = '"';
    let apost = '\'';
    let newline = '\n';
    let heart = '\u{2764}';

    let tokens = quote! {
        #zero #pound #quote #apost #newline #heart
    };
    let expected = "'\\u{1}' '#' '\"' '\\'' '\\n' '\u{2764}'";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_str() {
    let s = "\u{1} a 'b \" c";
    let tokens = quote!(#s);
    let expected = "\"\\u{1} a 'b \\\" c\"";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_string() {
    let s = "\u{1} a 'b \" c".to_string();
    let tokens = quote!(#s);
    let expected = "\"\\u{1} a 'b \\\" c\"";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_c_str() {
    let s = CStr::from_bytes_with_nul(b"\x01 a 'b \" c\0").unwrap();
    let tokens = quote!(#s);
    let expected = "c\"\\u{1} a 'b \\\" c\"";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_c_string() {
    let s = CString::new(&b"\x01 a 'b \" c"[..]).unwrap();
    let tokens = quote!(#s);
    let expected = "c\"\\u{1} a 'b \\\" c\"";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_interpolated_literal() {
    macro_rules! m {
        ($literal:literal) => {
            quote!($literal)
        };
    }

    let tokens = m!(1);
    let expected = "1";
    assert_eq!(expected, tokens.to_string());

    let tokens = m!(-1);
    let expected = "- 1";
    assert_eq!(expected, tokens.to_string());

    let tokens = m!(true);
    let expected = "true";
    assert_eq!(expected, tokens.to_string());

    let tokens = m!(-true);
    let expected = "- true";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_ident() {
    let foo = Ident::new("Foo", Span::call_site());
    let bar = Ident::new(&format!("Bar{}", 7), Span::call_site());
    let tokens = quote!(struct #foo; enum #bar {});
    let expected = "struct Foo ; enum Bar7 { }";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_underscore() {
    let tokens = quote!(let _;);
    let expected = "let _ ;";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_duplicate() {
    let ch = 'x';

    let tokens = quote!(#ch #ch);

    let expected = "'x' 'x'";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_fancy_repetition() {
    let foo = vec!["a", "b"];
    let bar = vec![true, false];

    let tokens = quote! {
        #(#foo: #bar),*
    };

    let expected = r#""a" : true , "b" : false"#;
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_nested_fancy_repetition() {
    let nested = vec![vec!['a', 'b', 'c'], vec!['x', 'y', 'z']];

    let tokens = quote! {
        #(
            #(#nested)*
        ),*
    };

    let expected = "'a' 'b' 'c' , 'x' 'y' 'z'";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_duplicate_name_repetition() {
    let foo = &["a", "b"];

    let tokens = quote! {
        #(#foo: #foo),*
        #(#foo: #foo),*
    };

    let expected = r#""a" : "a" , "b" : "b" "a" : "a" , "b" : "b""#;
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_duplicate_name_repetition_no_copy() {
    let foo = vec!["a".to_owned(), "b".to_owned()];

    let tokens = quote! {
        #(#foo: #foo),*
    };

    let expected = r#""a" : "a" , "b" : "b""#;
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_btreeset_repetition() {
    let mut set = BTreeSet::new();
    set.insert("a".to_owned());
    set.insert("b".to_owned());

    let tokens = quote! {
        #(#set: #set),*
    };

    let expected = r#""a" : "a" , "b" : "b""#;
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_variable_name_conflict() {
    // The implementation of `#(...),*` uses the variable `_i` but it should be
    // fine, if a little confusing when debugging.
    let _i = vec!['a', 'b'];
    let tokens = quote! { #(#_i),* };
    let expected = "'a' , 'b'";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_nonrep_in_repetition() {
    let rep = vec!["a", "b"];
    let nonrep = "c";

    let tokens = quote! {
        #(#rep #rep : #nonrep #nonrep),*
    };

    let expected = r#""a" "a" : "c" "c" , "b" "b" : "c" "c""#;
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_empty_quote() {
    let tokens = quote!();
    assert_eq!("", tokens.to_string());
}

#[test]
fn test_box_str() {
    let b = "str".to_owned().into_boxed_str();
    let tokens = quote! { #b };
    assert_eq!("\"str\"", tokens.to_string());
}

#[test]
fn test_cow() {
    let owned: Cow<Ident> = Cow::Owned(Ident::new("owned", Span::call_site()));

    let ident = Ident::new("borrowed", Span::call_site());
    let borrowed = Cow::Borrowed(&ident);

    let tokens = quote! { #owned #borrowed };
    assert_eq!("owned borrowed", tokens.to_string());
}

#[test]
fn test_closure() {
    fn field_i(i: usize) -> Ident {
        format_ident!("__field{}", i)
    }

    let fields = (0usize..3)
        .map(field_i as fn(_) -> _)
        .map(|var| quote! { #var });

    let tokens = quote! { #(#fields)* };
    assert_eq!("__field0 __field1 __field2", tokens.to_string());
}

#[test]
fn test_append_tokens() {
    let mut a = quote!(a);
    let b = quote!(b);
    a.append_all(b);
    assert_eq!("a b", a.to_string());
}

#[test]
fn test_format_ident() {
    let id0 = format_ident!("Aa");
    let id1 = format_ident!("Hello{x}", x = id0);
    let id2 = format_ident!("Hello{x}", x = 5usize);
    let id3 = format_ident!("Hello{}_{x}", id0, x = 10usize);
    let id4 = format_ident!("Aa", span = Span::call_site());
    let id5 = format_ident!("Hello{}", Cow::Borrowed("World"));

    assert_eq!(id0, "Aa");
    assert_eq!(id1, "HelloAa");
    assert_eq!(id2, "Hello5");
    assert_eq!(id3, "HelloAa_10");
    assert_eq!(id4, "Aa");
    assert_eq!(id5, "HelloWorld");
}

#[test]
fn test_format_ident_strip_raw() {
    let id = format_ident!("r#struct");
    let my_id = format_ident!("MyId{}", id);
    let raw_my_id = format_ident!("r#MyId{}", id);

    assert_eq!(id, "r#struct");
    assert_eq!(my_id, "MyIdstruct");
    assert_eq!(raw_my_id, "r#MyIdstruct");
}

#[test]
fn test_outer_line_comment() {
    let tokens = quote! {
        /// doc
    };
    let expected = "# [doc = r\" doc\"]";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_inner_line_comment() {
    let tokens = quote! {
        //! doc
    };
    let expected = "# ! [doc = r\" doc\"]";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_outer_block_comment() {
    let tokens = quote! {
        /** doc */
    };
    let expected = "# [doc = r\" doc \"]";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_inner_block_comment() {
    let tokens = quote! {
        /*! doc */
    };
    let expected = "# ! [doc = r\" doc \"]";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_outer_attr() {
    let tokens = quote! {
        #[inline]
    };
    let expected = "# [inline]";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_inner_attr() {
    let tokens = quote! {
        #![no_std]
    };
    let expected = "# ! [no_std]";
    assert_eq!(expected, tokens.to_string());
}

// https://github.com/dtolnay/quote/issues/130
#[test]
fn test_star_after_repetition() {
    let c = vec!['0', '1'];
    let tokens = quote! {
        #(
            f(#c);
        )*
        *out = None;
    };
    let expected = "f ('0') ; f ('1') ; * out = None ;";
    assert_eq!(expected, tokens.to_string());
}

#[test]
fn test_quote_raw_id() {
    let id = quote!(r#raw_id);
    assert_eq!(id.to_string(), "r#raw_id");
}

#[test]
fn test_type_inference_for_span() {
    trait CallSite {
        fn get() -> Self;
    }

    impl CallSite for Span {
        fn get() -> Self {
            Span::call_site()
        }
    }

    let span = Span::call_site();
    let _ = quote_spanned!(span=> ...);

    let delim_span = Group::new(Delimiter::Parenthesis, TokenStream::new()).delim_span();
    let _ = quote_spanned!(delim_span=> ...);

    let inferred = CallSite::get();
    let _ = quote_spanned!(inferred=> ...);

    if false {
        let proc_macro_span = proc_macro::Span::call_site();
        let _ = quote_spanned!(proc_macro_span.into()=> ...);
    }
}