use ra_syntax::{ast, AstNode}; use super::*; // Good first issue (although a slightly challenging one): // // * Pick a random test from here // https://github.com/intellij-rust/intellij-rust/blob/c4e9feee4ad46e7953b1948c112533360b6087bb/src/test/kotlin/org/rust/lang/core/macros/RsMacroExpansionTest.kt // * Port the test to rust and add it to this module // * Make it pass :-) #[test] fn test_convert_tt() { let macro_definition = r#" macro_rules! impl_froms { ($e:ident: $($v:ident),*) => { $( impl From<$v> for $e { fn from(it: $v) -> $e { $e::$v(it) } } )* } } "#; let macro_invocation = r#" impl_froms!(TokenTree: Leaf, Subtree); "#; let source_file = ast::SourceFile::parse(macro_definition).ok().unwrap(); let macro_definition = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap(); let source_file = ast::SourceFile::parse(macro_invocation).ok().unwrap(); let macro_invocation = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap(); let (definition_tt, _) = ast_to_token_tree(macro_definition.token_tree().unwrap()).unwrap(); let (invocation_tt, _) = ast_to_token_tree(macro_invocation.token_tree().unwrap()).unwrap(); let rules = crate::MacroRules::parse(&definition_tt).unwrap(); let expansion = rules.expand(&invocation_tt).unwrap(); assert_eq!( expansion.to_string(), "impl From for TokenTree {fn from (it : Leaf) -> TokenTree {TokenTree ::Leaf (it)}} \ impl From for TokenTree {fn from (it : Subtree) -> TokenTree {TokenTree ::Subtree (it)}}" ) } pub(crate) fn create_rules(macro_definition: &str) -> MacroRules { let source_file = ast::SourceFile::parse(macro_definition).ok().unwrap(); let macro_definition = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap(); let (definition_tt, _) = ast_to_token_tree(macro_definition.token_tree().unwrap()).unwrap(); crate::MacroRules::parse(&definition_tt).unwrap() } pub(crate) fn expand(rules: &MacroRules, invocation: &str) -> tt::Subtree { let source_file = ast::SourceFile::parse(invocation).ok().unwrap(); let macro_invocation = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap(); let (invocation_tt, _) = ast_to_token_tree(macro_invocation.token_tree().unwrap()).unwrap(); rules.expand(&invocation_tt).unwrap() } pub(crate) fn expand_to_items( rules: &MacroRules, invocation: &str, ) -> ra_syntax::TreeArc { let expanded = expand(rules, invocation); token_tree_to_macro_items(&expanded).unwrap() } #[allow(unused)] pub(crate) fn expand_to_stmts( rules: &MacroRules, invocation: &str, ) -> ra_syntax::TreeArc { let expanded = expand(rules, invocation); token_tree_to_macro_stmts(&expanded).unwrap() } pub(crate) fn expand_to_expr( rules: &MacroRules, invocation: &str, ) -> ra_syntax::TreeArc { let expanded = expand(rules, invocation); token_tree_to_expr(&expanded).unwrap() } pub(crate) fn text_to_tokentree(text: &str) -> tt::Subtree { // wrap the given text to a macro call let wrapped = format!("wrap_macro!( {} )", text); let wrapped = ast::SourceFile::parse(&wrapped); let wrapped = wrapped.tree().syntax().descendants().find_map(ast::TokenTree::cast).unwrap(); let mut wrapped = ast_to_token_tree(wrapped).unwrap().0; wrapped.delimiter = tt::Delimiter::None; wrapped } pub(crate) enum MacroKind { Items, Stmts, } use ra_syntax::WalkEvent; pub fn debug_dump_ignore_spaces(node: &ra_syntax::SyntaxNode) -> String { use std::fmt::Write; let mut level = 0; let mut buf = String::new(); macro_rules! indent { () => { for _ in 0..level { buf.push_str(" "); } }; } for event in node.preorder_with_tokens() { match event { WalkEvent::Enter(element) => { match element { ra_syntax::SyntaxElement::Node(node) => { indent!(); writeln!(buf, "{:?}", node.kind()).unwrap(); } ra_syntax::SyntaxElement::Token(token) => match token.kind() { ra_syntax::SyntaxKind::WHITESPACE => {} _ => { indent!(); writeln!(buf, "{:?}", token.kind()).unwrap(); } }, } level += 1; } WalkEvent::Leave(_) => level -= 1, } } buf } pub(crate) fn assert_expansion( kind: MacroKind, rules: &MacroRules, invocation: &str, expected: &str, ) -> tt::Subtree { let expanded = expand(rules, invocation); assert_eq!(expanded.to_string(), expected); let expected = expected.replace("$crate", "C_C__C"); // wrap the given text to a macro call let expected = text_to_tokentree(&expected); let (expanded_tree, expected_tree) = match kind { MacroKind::Items => { let expanded_tree = token_tree_to_macro_items(&expanded); let expected_tree = token_tree_to_macro_items(&expected); ( debug_dump_ignore_spaces(expanded_tree.unwrap().syntax()).trim().to_string(), debug_dump_ignore_spaces(expected_tree.unwrap().syntax()).trim().to_string(), ) } MacroKind::Stmts => { let expanded_tree = token_tree_to_macro_stmts(&expanded); let expected_tree = token_tree_to_macro_stmts(&expected); ( debug_dump_ignore_spaces(expanded_tree.unwrap().syntax()).trim().to_string(), debug_dump_ignore_spaces(expected_tree.unwrap().syntax()).trim().to_string(), ) } }; let expected_tree = expected_tree.replace("C_C__C", "$crate"); assert_eq!( expanded_tree, expected_tree, "left => {}\nright => {}", expanded_tree, expected_tree, ); expanded } #[test] fn test_fail_match_pattern_by_first_token() { let rules = create_rules( r#" macro_rules! foo { ($ i:ident) => ( mod $ i {} ); (= $ i:ident) => ( fn $ i() {} ); (+ $ i:ident) => ( struct $ i; ) } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo }", "mod foo {}"); assert_expansion(MacroKind::Items, &rules, "foo! { = bar }", "fn bar () {}"); assert_expansion(MacroKind::Items, &rules, "foo! { + Baz }", "struct Baz ;"); } #[test] fn test_fail_match_pattern_by_last_token() { let rules = create_rules( r#" macro_rules! foo { ($ i:ident) => ( mod $ i {} ); ($ i:ident =) => ( fn $ i() {} ); ($ i:ident +) => ( struct $ i; ) } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo }", "mod foo {}"); assert_expansion(MacroKind::Items, &rules, "foo! { bar = }", "fn bar () {}"); assert_expansion(MacroKind::Items, &rules, "foo! { Baz + }", "struct Baz ;"); } #[test] fn test_fail_match_pattern_by_word_token() { let rules = create_rules( r#" macro_rules! foo { ($ i:ident) => ( mod $ i {} ); (spam $ i:ident) => ( fn $ i() {} ); (eggs $ i:ident) => ( struct $ i; ) } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo }", "mod foo {}"); assert_expansion(MacroKind::Items, &rules, "foo! { spam bar }", "fn bar () {}"); assert_expansion(MacroKind::Items, &rules, "foo! { eggs Baz }", "struct Baz ;"); } #[test] fn test_match_group_pattern_by_separator_token() { let rules = create_rules( r#" macro_rules! foo { ($ ($ i:ident),*) => ($ ( mod $ i {} )*); ($ ($ i:ident)#*) => ($ ( fn $ i() {} )*); ($ i:ident ,# $ j:ident) => ( struct $ i; struct $ j; ) } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo, bar }", "mod foo {} mod bar {}"); assert_expansion(MacroKind::Items, &rules, "foo! { foo# bar }", "fn foo () {} fn bar () {}"); assert_expansion(MacroKind::Items, &rules, "foo! { Foo,# Bar }", "struct Foo ; struct Bar ;"); } #[test] fn test_match_group_pattern_with_multiple_defs() { let rules = create_rules( r#" macro_rules! foo { ($ ($ i:ident),*) => ( struct Bar { $ ( fn $ i {} )*} ); } "#, ); assert_expansion( MacroKind::Items, &rules, "foo! { foo, bar }", "struct Bar {fn foo {} fn bar {}}", ); } #[test] fn test_match_group_pattern_with_multiple_statement() { let rules = create_rules( r#" macro_rules! foo { ($ ($ i:ident),*) => ( fn baz { $ ( $ i (); )*} ); } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo, bar }", "fn baz {foo () ; bar () ;}"); } #[test] fn test_match_group_pattern_with_multiple_statement_without_semi() { let rules = create_rules( r#" macro_rules! foo { ($ ($ i:ident),*) => ( fn baz { $ ( $i() );*} ); } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo, bar }", "fn baz {foo () ;bar ()}"); } #[test] fn test_match_group_empty_fixed_token() { let rules = create_rules( r#" macro_rules! foo { ($ ($ i:ident)* #abc) => ( fn baz { $ ( $ i (); )*} ); } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! {#abc}", "fn baz {}"); } #[test] fn test_match_group_in_subtree() { let rules = create_rules( r#" macro_rules! foo { (fn $name:ident {$($i:ident)*} ) => ( fn $name() { $ ( $ i (); )*} ); }"#, ); assert_expansion(MacroKind::Items, &rules, "foo! {fn baz {a b} }", "fn baz () {a () ; b () ;}"); } #[test] fn test_match_group_with_multichar_sep() { let rules = create_rules( r#" macro_rules! foo { (fn $name:ident {$($i:literal)*} ) => ( fn $name() -> bool { $($i)&&*} ); }"#, ); assert_expansion( MacroKind::Items, &rules, "foo! (fn baz {true true} );", "fn baz () -> bool {true &&true}", ); } #[test] fn test_match_group_zero_match() { let rules = create_rules( r#" macro_rules! foo { ( $($i:ident)* ) => (); }"#, ); assert_expansion(MacroKind::Items, &rules, "foo! ();", ""); } #[test] fn test_match_group_in_group() { let rules = create_rules( r#" macro_rules! foo { { $( ( $($i:ident)* ) )* } => ( $( ( $($i)* ) )* ); }"#, ); assert_expansion(MacroKind::Items, &rules, "foo! ( (a b) );", "(a b)"); } #[test] fn test_expand_to_item_list() { let rules = create_rules( " macro_rules! structs { ($($i:ident),*) => { $(struct $i { field: u32 } )* } } ", ); let expansion = expand(&rules, "structs!(Foo, Bar);"); let tree = token_tree_to_macro_items(&expansion); assert_eq!( tree.unwrap().syntax().debug_dump().trim(), r#" MACRO_ITEMS@[0; 40) STRUCT_DEF@[0; 20) STRUCT_KW@[0; 6) "struct" NAME@[6; 9) IDENT@[6; 9) "Foo" NAMED_FIELD_DEF_LIST@[9; 20) L_CURLY@[9; 10) "{" NAMED_FIELD_DEF@[10; 19) NAME@[10; 15) IDENT@[10; 15) "field" COLON@[15; 16) ":" PATH_TYPE@[16; 19) PATH@[16; 19) PATH_SEGMENT@[16; 19) NAME_REF@[16; 19) IDENT@[16; 19) "u32" R_CURLY@[19; 20) "}" STRUCT_DEF@[20; 40) STRUCT_KW@[20; 26) "struct" NAME@[26; 29) IDENT@[26; 29) "Bar" NAMED_FIELD_DEF_LIST@[29; 40) L_CURLY@[29; 30) "{" NAMED_FIELD_DEF@[30; 39) NAME@[30; 35) IDENT@[30; 35) "field" COLON@[35; 36) ":" PATH_TYPE@[36; 39) PATH@[36; 39) PATH_SEGMENT@[36; 39) NAME_REF@[36; 39) IDENT@[36; 39) "u32" R_CURLY@[39; 40) "}""# .trim() ); } #[test] fn test_expand_literals_to_token_tree() { fn to_subtree(tt: &tt::TokenTree) -> &tt::Subtree { if let tt::TokenTree::Subtree(subtree) = tt { return &subtree; } unreachable!("It is not a subtree"); } fn to_literal(tt: &tt::TokenTree) -> &tt::Literal { if let tt::TokenTree::Leaf(tt::Leaf::Literal(lit)) = tt { return lit; } unreachable!("It is not a literal"); } let rules = create_rules( r#" macro_rules! literals { ($i:ident) => { { let a = 'c'; let c = 1000; let f = 12E+99_f64; let s = "rust1"; } } } "#, ); let expansion = expand(&rules, "literals!(foo);"); let stm_tokens = &to_subtree(&expansion.token_trees[0]).token_trees; // [let] [a] [=] ['c'] [;] assert_eq!(to_literal(&stm_tokens[3]).text, "'c'"); // [let] [c] [=] [1000] [;] assert_eq!(to_literal(&stm_tokens[5 + 3]).text, "1000"); // [let] [f] [=] [12E+99_f64] [;] assert_eq!(to_literal(&stm_tokens[10 + 3]).text, "12E+99_f64"); // [let] [s] [=] ["rust1"] [;] assert_eq!(to_literal(&stm_tokens[15 + 3]).text, "\"rust1\""); } #[test] fn test_two_idents() { let rules = create_rules( r#" macro_rules! foo { ($ i:ident, $ j:ident) => { fn foo() { let a = $ i; let b = $j; } } } "#, ); assert_expansion( MacroKind::Items, &rules, "foo! { foo, bar }", "fn foo () {let a = foo ; let b = bar ;}", ); } #[test] fn test_tt_to_stmts() { let rules = create_rules( r#" macro_rules! foo { () => { let a = 0; a = 10 + 1; a } } "#, ); let expanded = expand(&rules, "foo!{}"); let stmts = token_tree_to_macro_stmts(&expanded); assert_eq!( stmts.unwrap().syntax().debug_dump().trim(), r#"MACRO_STMTS@[0; 15) LET_STMT@[0; 7) LET_KW@[0; 3) "let" BIND_PAT@[3; 4) NAME@[3; 4) IDENT@[3; 4) "a" EQ@[4; 5) "=" LITERAL@[5; 6) INT_NUMBER@[5; 6) "0" SEMI@[6; 7) ";" EXPR_STMT@[7; 14) BIN_EXPR@[7; 13) PATH_EXPR@[7; 8) PATH@[7; 8) PATH_SEGMENT@[7; 8) NAME_REF@[7; 8) IDENT@[7; 8) "a" EQ@[8; 9) "=" BIN_EXPR@[9; 13) LITERAL@[9; 11) INT_NUMBER@[9; 11) "10" PLUS@[11; 12) "+" LITERAL@[12; 13) INT_NUMBER@[12; 13) "1" SEMI@[13; 14) ";" EXPR_STMT@[14; 15) PATH_EXPR@[14; 15) PATH@[14; 15) PATH_SEGMENT@[14; 15) NAME_REF@[14; 15) IDENT@[14; 15) "a""#, ); } #[test] fn test_match_literal() { let rules = create_rules( r#" macro_rules! foo { ('(') => { fn foo() {} } } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! ['('];", "fn foo () {}"); } // The following tests are port from intellij-rust directly // https://github.com/intellij-rust/intellij-rust/blob/c4e9feee4ad46e7953b1948c112533360b6087bb/src/test/kotlin/org/rust/lang/core/macros/RsMacroExpansionTest.kt #[test] fn test_path() { let rules = create_rules( r#" macro_rules! foo { ($ i:path) => { fn foo() { let a = $ i; } } } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo }", "fn foo () {let a = foo ;}"); assert_expansion( MacroKind::Items, &rules, "foo! { bar::::baz:: }", "fn foo () {let a = bar ::< u8 >:: baz ::< u8 > ;}", ); } #[test] fn test_two_paths() { let rules = create_rules( r#" macro_rules! foo { ($ i:path, $ j:path) => { fn foo() { let a = $ i; let b = $j; } } } "#, ); assert_expansion( MacroKind::Items, &rules, "foo! { foo, bar }", "fn foo () {let a = foo ; let b = bar ;}", ); } #[test] fn test_path_with_path() { let rules = create_rules( r#" macro_rules! foo { ($ i:path) => { fn foo() { let a = $ i :: bar; } } } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { foo }", "fn foo () {let a = foo :: bar ;}"); } #[test] fn test_expr() { let rules = create_rules( r#" macro_rules! foo { ($ i:expr) => { fn bar() { $ i; } } } "#, ); assert_expansion( MacroKind::Items, &rules, "foo! { 2 + 2 * baz(3).quux() }", "fn bar () {2 + 2 * baz (3) . quux () ;}", ); } #[test] fn test_expr_order() { let rules = create_rules( r#" macro_rules! foo { ($ i:expr) => { fn bar() { $ i * 2; } } } "#, ); assert_eq!( expand_to_items(&rules, "foo! { 1 + 1 }").syntax().debug_dump().trim(), r#"MACRO_ITEMS@[0; 15) FN_DEF@[0; 15) FN_KW@[0; 2) "fn" NAME@[2; 5) IDENT@[2; 5) "bar" PARAM_LIST@[5; 7) L_PAREN@[5; 6) "(" R_PAREN@[6; 7) ")" BLOCK@[7; 15) L_CURLY@[7; 8) "{" EXPR_STMT@[8; 14) BIN_EXPR@[8; 13) BIN_EXPR@[8; 11) LITERAL@[8; 9) INT_NUMBER@[8; 9) "1" PLUS@[9; 10) "+" LITERAL@[10; 11) INT_NUMBER@[10; 11) "1" STAR@[11; 12) "*" LITERAL@[12; 13) INT_NUMBER@[12; 13) "2" SEMI@[13; 14) ";" R_CURLY@[14; 15) "}""#, ); } #[test] fn test_last_expr() { let rules = create_rules( r#" macro_rules! vec { ($($item:expr),*) => { { let mut v = Vec::new(); $( v.push($item); )* v } }; } "#, ); assert_expansion( MacroKind::Items, &rules, "vec!(1,2,3);", "{let mut v = Vec :: new () ; v . push (1) ; v . push (2) ; v . push (3) ; v}", ); } #[test] fn test_ty() { let rules = create_rules( r#" macro_rules! foo { ($ i:ty) => ( fn bar() -> $ i { unimplemented!() } ) } "#, ); assert_expansion( MacroKind::Items, &rules, "foo! { Baz }", "fn bar () -> Baz < u8 > {unimplemented ! ()}", ); } #[test] fn test_ty_with_complex_type() { let rules = create_rules( r#" macro_rules! foo { ($ i:ty) => ( fn bar() -> $ i { unimplemented!() } ) } "#, ); // Reference lifetime struct with generic type assert_expansion( MacroKind::Items, &rules, "foo! { &'a Baz }", "fn bar () -> & 'a Baz < u8 > {unimplemented ! ()}", ); // extern "Rust" func type assert_expansion( MacroKind::Items, &rules, r#"foo! { extern "Rust" fn() -> Ret }"#, r#"fn bar () -> extern "Rust" fn () -> Ret {unimplemented ! ()}"#, ); } #[test] fn test_pat_() { let rules = create_rules( r#" macro_rules! foo { ($ i:pat) => { fn foo() { let $ i; } } } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { (a, b) }", "fn foo () {let (a , b) ;}"); } #[test] fn test_stmt() { let rules = create_rules( r#" macro_rules! foo { ($ i:stmt) => ( fn bar() { $ i; } ) } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! { 2 }", "fn bar () {2 ;}"); assert_expansion(MacroKind::Items, &rules, "foo! { let a = 0 }", "fn bar () {let a = 0 ;}"); } #[test] fn test_single_item() { let rules = create_rules( r#" macro_rules! foo { ($ i:item) => ( $ i ) } "#, ); assert_expansion(MacroKind::Items, &rules, "foo! {mod c {}}", "mod c {}"); } #[test] fn test_all_items() { let rules = create_rules( r#" macro_rules! foo { ($ ($ i:item)*) => ($ ( $ i )*) } "#, ); assert_expansion(MacroKind::Items, &rules, r#" foo! { extern crate a; mod b; mod c {} use d; const E: i32 = 0; static F: i32 = 0; impl G {} struct H; enum I { Foo } trait J {} fn h() {} extern {} type T = u8; } "#, r#"extern crate a ; mod b ; mod c {} use d ; const E : i32 = 0 ; static F : i32 = 0 ; impl G {} struct H ; enum I {Foo} trait J {} fn h () {} extern {} type T = u8 ;"#); } #[test] fn test_block() { let rules = create_rules( r#" macro_rules! foo { ($ i:block) => { fn foo() $ i } } "#, ); assert_expansion(MacroKind::Stmts, &rules, "foo! { { 1; } }", "fn foo () {1 ;}"); } #[test] fn test_meta() { let rules = create_rules( r#" macro_rules! foo { ($ i:meta) => ( #[$ i] fn bar() {} ) } "#, ); assert_expansion( MacroKind::Items, &rules, r#"foo! { cfg(target_os = "windows") }"#, r#"# [cfg (target_os = "windows")] fn bar () {}"#, ); } #[test] fn test_meta_doc_comments() { let rules = create_rules( r#" macro_rules! foo { ($(#[$ i:meta])+) => ( $(#[$ i])+ fn bar() {} ) } "#, ); assert_expansion( MacroKind::Items, &rules, r#"foo! { /// Single Line Doc 1 /** MultiLines Doc */ }"#, "# [doc = \" Single Line Doc 1\"] # [doc = \"\\\\n MultiLines Doc\\\\n \"] fn bar () {}", ); } #[test] fn test_tt_block() { let rules = create_rules( r#" macro_rules! foo { ($ i:tt) => { fn foo() $ i } } "#, ); assert_expansion(MacroKind::Items, &rules, r#"foo! { { 1; } }"#, r#"fn foo () {1 ;}"#); } #[test] fn test_tt_group() { let rules = create_rules( r#" macro_rules! foo { ($($ i:tt)*) => { $($ i)* } } "#, ); assert_expansion(MacroKind::Items, &rules, r#"foo! { fn foo() {} }"#, r#"fn foo () {}"#); } #[test] fn test_lifetime() { let rules = create_rules( r#" macro_rules! foo { ($ lt:lifetime) => { struct Ref<$ lt>{ s: &$ lt str } } } "#, ); assert_expansion(MacroKind::Items, &rules, r#"foo!{'a}"#, r#"struct Ref <'a > {s : &'a str}"#); } #[test] fn test_literal() { let rules = create_rules( r#" macro_rules! foo { ($ type:ty $ lit:literal) => { const VALUE: $ type = $ lit;}; } "#, ); assert_expansion(MacroKind::Items, &rules, r#"foo!(u8 0);"#, r#"const VALUE : u8 = 0 ;"#); } #[test] fn test_vis() { let rules = create_rules( r#" macro_rules! foo { ($ vis:vis $ name:ident) => { $ vis fn $ name() {}}; } "#, ); assert_expansion(MacroKind::Items, &rules, r#"foo!(pub foo);"#, r#"pub fn foo () {}"#); // test optional casse assert_expansion(MacroKind::Items, &rules, r#"foo!(foo);"#, r#"fn foo () {}"#); } #[test] fn test_inner_macro_rules() { let rules = create_rules( r#" macro_rules! foo { ($a:ident, $b:ident, $c:tt) => { macro_rules! bar { ($bi:ident) => { fn $bi() -> u8 {$c} } } bar!($a); fn $b() -> u8 {$c} } } "#, ); assert_expansion( MacroKind::Items, &rules, r#"foo!(x,y, 1);"#, r#"macro_rules ! bar {($ bi : ident) => {fn $ bi () -> u8 {1}}} bar ! (x) ; fn y () -> u8 {1}"#, ); } // The following tests are based on real world situations #[test] fn test_vec() { let rules = create_rules( r#" macro_rules! vec { ($($item:expr),*) => { { let mut v = Vec::new(); $( v.push($item); )* v } }; } "#, ); assert_expansion(MacroKind::Items, &rules, r#"vec!();"#, r#"{let mut v = Vec :: new () ; v}"#); assert_expansion( MacroKind::Items, &rules, r#"vec![1u32,2];"#, r#"{let mut v = Vec :: new () ; v . push (1u32) ; v . push (2) ; v}"#, ); assert_eq!( expand_to_expr(&rules, r#"vec![1u32,2];"#).syntax().debug_dump().trim(), r#"BLOCK_EXPR@[0; 45) BLOCK@[0; 45) L_CURLY@[0; 1) "{" LET_STMT@[1; 20) LET_KW@[1; 4) "let" BIND_PAT@[4; 8) MUT_KW@[4; 7) "mut" NAME@[7; 8) IDENT@[7; 8) "v" EQ@[8; 9) "=" CALL_EXPR@[9; 19) PATH_EXPR@[9; 17) PATH@[9; 17) PATH@[9; 12) PATH_SEGMENT@[9; 12) NAME_REF@[9; 12) IDENT@[9; 12) "Vec" COLONCOLON@[12; 14) "::" PATH_SEGMENT@[14; 17) NAME_REF@[14; 17) IDENT@[14; 17) "new" ARG_LIST@[17; 19) L_PAREN@[17; 18) "(" R_PAREN@[18; 19) ")" SEMI@[19; 20) ";" EXPR_STMT@[20; 33) METHOD_CALL_EXPR@[20; 32) PATH_EXPR@[20; 21) PATH@[20; 21) PATH_SEGMENT@[20; 21) NAME_REF@[20; 21) IDENT@[20; 21) "v" DOT@[21; 22) "." NAME_REF@[22; 26) IDENT@[22; 26) "push" ARG_LIST@[26; 32) L_PAREN@[26; 27) "(" LITERAL@[27; 31) INT_NUMBER@[27; 31) "1u32" R_PAREN@[31; 32) ")" SEMI@[32; 33) ";" EXPR_STMT@[33; 43) METHOD_CALL_EXPR@[33; 42) PATH_EXPR@[33; 34) PATH@[33; 34) PATH_SEGMENT@[33; 34) NAME_REF@[33; 34) IDENT@[33; 34) "v" DOT@[34; 35) "." NAME_REF@[35; 39) IDENT@[35; 39) "push" ARG_LIST@[39; 42) L_PAREN@[39; 40) "(" LITERAL@[40; 41) INT_NUMBER@[40; 41) "2" R_PAREN@[41; 42) ")" SEMI@[42; 43) ";" PATH_EXPR@[43; 44) PATH@[43; 44) PATH_SEGMENT@[43; 44) NAME_REF@[43; 44) IDENT@[43; 44) "v" R_CURLY@[44; 45) "}""# ); } #[test] fn test_winapi_struct() { // from https://github.com/retep998/winapi-rs/blob/a7ef2bca086aae76cf6c4ce4c2552988ed9798ad/src/macros.rs#L366 let rules = create_rules( r#" macro_rules! STRUCT { ($(#[$attrs:meta])* struct $name:ident { $($field:ident: $ftype:ty,)+ }) => ( #[repr(C)] #[derive(Copy)] $(#[$attrs])* pub struct $name { $(pub $field: $ftype,)+ } impl Clone for $name { #[inline] fn clone(&self) -> $name { *self } } #[cfg(feature = "impl-default")] impl Default for $name { #[inline] fn default() -> $name { unsafe { $crate::_core::mem::zeroed() } } } ); } "#, ); // from https://github.com/retep998/winapi-rs/blob/a7ef2bca086aae76cf6c4ce4c2552988ed9798ad/src/shared/d3d9caps.rs assert_expansion(MacroKind::Items, &rules, r#"STRUCT!{struct D3DVSHADERCAPS2_0 {Caps: u8,}}"#, "# [repr (C)] # [derive (Copy)] pub struct D3DVSHADERCAPS2_0 {pub Caps : u8 ,} impl Clone for D3DVSHADERCAPS2_0 {# [inline] fn clone (& self) -> D3DVSHADERCAPS2_0 {* self}} # [cfg (feature = \"impl-default\")] impl Default for D3DVSHADERCAPS2_0 {# [inline] fn default () -> D3DVSHADERCAPS2_0 {unsafe {$crate :: _core :: mem :: zeroed ()}}}"); assert_expansion(MacroKind::Items, &rules, r#"STRUCT!{#[cfg_attr(target_arch = "x86", repr(packed))] struct D3DCONTENTPROTECTIONCAPS {Caps : u8 ,}}"#, "# [repr (C)] # [derive (Copy)] # [cfg_attr (target_arch = \"x86\" , repr (packed))] pub struct D3DCONTENTPROTECTIONCAPS {pub Caps : u8 ,} impl Clone for D3DCONTENTPROTECTIONCAPS {# [inline] fn clone (& self) -> D3DCONTENTPROTECTIONCAPS {* self}} # [cfg (feature = \"impl-default\")] impl Default for D3DCONTENTPROTECTIONCAPS {# [inline] fn default () -> D3DCONTENTPROTECTIONCAPS {unsafe {$crate :: _core :: mem :: zeroed ()}}}"); } #[test] fn test_int_base() { let rules = create_rules( r#" macro_rules! int_base { ($Trait:ident for $T:ident as $U:ident -> $Radix:ident) => { #[stable(feature = "rust1", since = "1.0.0")] impl fmt::$Trait for $T { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { $Radix.fmt_int(*self as $U, f) } } } } "#, ); assert_expansion(MacroKind::Items, &rules, r#" int_base!{Binary for isize as usize -> Binary}"#, "# [stable (feature = \"rust1\" , since = \"1.0.0\")] impl fmt ::Binary for isize {fn fmt (& self , f : & mut fmt :: Formatter < \'_ >) -> fmt :: Result {Binary . fmt_int (* self as usize , f)}}" ); } #[test] fn test_generate_pattern_iterators() { // from https://github.com/rust-lang/rust/blob/316a391dcb7d66dc25f1f9a4ec9d368ef7615005/src/libcore/str/mod.rs let rules = create_rules( r#" macro_rules! generate_pattern_iterators { { double ended; with $(#[$common_stability_attribute:meta])*, $forward_iterator:ident, $reverse_iterator:ident, $iterty:ty } => { fn foo(){} } } "#, ); assert_expansion(MacroKind::Items, &rules, r#"generate_pattern_iterators ! ( double ended ; with # [ stable ( feature = "rust1" , since = "1.0.0" ) ] , Split , RSplit , & 'a str );"#, "fn foo () {}"); } #[test] fn test_impl_fn_for_zst() { // from https://github.com/rust-lang/rust/blob/5d20ff4d2718c820632b38c1e49d4de648a9810b/src/libcore/internal_macros.rs let rules = create_rules( r#" macro_rules! impl_fn_for_zst { { $( $( #[$attr: meta] )* struct $Name: ident impl$( <$( $lifetime : lifetime ),+> )? Fn = |$( $arg: ident: $ArgTy: ty ),*| -> $ReturnTy: ty $body: block; )+ } => { $( $( #[$attr] )* struct $Name; impl $( <$( $lifetime ),+> )? Fn<($( $ArgTy, )*)> for $Name { #[inline] extern "rust-call" fn call(&self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy { $body } } impl $( <$( $lifetime ),+> )? FnMut<($( $ArgTy, )*)> for $Name { #[inline] extern "rust-call" fn call_mut( &mut self, ($( $arg, )*): ($( $ArgTy, )*) ) -> $ReturnTy { Fn::call(&*self, ($( $arg, )*)) } } impl $( <$( $lifetime ),+> )? FnOnce<($( $ArgTy, )*)> for $Name { type Output = $ReturnTy; #[inline] extern "rust-call" fn call_once(self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy { Fn::call(&self, ($( $arg, )*)) } } )+ } } "#, ); assert_expansion(MacroKind::Items, &rules, r#" impl_fn_for_zst ! { # [ derive ( Clone ) ] struct CharEscapeDebugContinue impl Fn = | c : char | -> char :: EscapeDebug { c . escape_debug_ext ( false ) } ; # [ derive ( Clone ) ] struct CharEscapeUnicode impl Fn = | c : char | -> char :: EscapeUnicode { c . escape_unicode ( ) } ; # [ derive ( Clone ) ] struct CharEscapeDefault impl Fn = | c : char | -> char :: EscapeDefault { c . escape_default ( ) } ; } "#, "# [derive (Clone)] struct CharEscapeDebugContinue ; impl Fn < (char ,) > for CharEscapeDebugContinue {# [inline] extern \"rust-call\" fn call (& self , (c ,) : (char ,)) -> char :: EscapeDebug {{c . escape_debug_ext (false)}}} impl FnMut < (char ,) > for CharEscapeDebugContinue {# [inline] extern \"rust-call\" fn call_mut (& mut self , (c ,) : (char ,)) -> char :: EscapeDebug {Fn :: call (&* self , (c ,))}} impl FnOnce < (char ,) > for CharEscapeDebugContinue {type Output = char :: EscapeDebug ; # [inline] extern \"rust-call\" fn call_once (self , (c ,) : (char ,)) -> char :: EscapeDebug {Fn :: call (& self , (c ,))}} # [derive (Clone)] struct CharEscapeUnicode ; impl Fn < (char ,) > for CharEscapeUnicode {# [inline] extern \"rust-call\" fn call (& self , (c ,) : (char ,)) -> char :: EscapeUnicode {{c . escape_unicode ()}}} impl FnMut < (char ,) > for CharEscapeUnicode {# [inline] extern \"rust-call\" fn call_mut (& mut self , (c ,) : (char ,)) -> char :: EscapeUnicode {Fn :: call (&* self , (c ,))}} impl FnOnce < (char ,) > for CharEscapeUnicode {type Output = char :: EscapeUnicode ; # [inline] extern \"rust-call\" fn call_once (self , (c ,) : (char ,)) -> char :: EscapeUnicode {Fn :: call (& self , (c ,))}} # [derive (Clone)] struct CharEscapeDefault ; impl Fn < (char ,) > for CharEscapeDefault {# [inline] extern \"rust-call\" fn call (& self , (c ,) : (char ,)) -> char :: EscapeDefault {{c . escape_default ()}}} impl FnMut < (char ,) > for CharEscapeDefault {# [inline] extern \"rust-call\" fn call_mut (& mut self , (c ,) : (char ,)) -> char :: EscapeDefault {Fn :: call (&* self , (c ,))}} impl FnOnce < (char ,) > for CharEscapeDefault {type Output = char :: EscapeDefault ; # [inline] extern \"rust-call\" fn call_once (self , (c ,) : (char ,)) -> char :: EscapeDefault {Fn :: call (& self , (c ,))}}"); } #[test] fn test_impl_nonzero_fmt() { // from https://github.com/rust-lang/rust/blob/316a391dcb7d66dc25f1f9a4ec9d368ef7615005/src/libcore/num/mod.rs#L12 let rules = create_rules( r#" macro_rules! impl_nonzero_fmt { ( #[$stability: meta] ( $( $Trait: ident ),+ ) for $Ty: ident ) => { fn foo () {} } } "#, ); assert_expansion(MacroKind::Items, &rules, r#"impl_nonzero_fmt! { # [stable(feature= "nonzero",since="1.28.0")] (Debug,Display,Binary,Octal,LowerHex,UpperHex) for NonZeroU8}"#, "fn foo () {}"); } #[test] fn test_cfg_if_items() { // from https://github.com/rust-lang/rust/blob/33fe1131cadba69d317156847be9a402b89f11bb/src/libstd/macros.rs#L986 let rules = create_rules( r#" macro_rules! __cfg_if_items { (($($not:meta,)*) ; ) => {}; (($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), $($rest:tt)*) => { __cfg_if_items! { ($($not,)* $($m,)*) ; $($rest)* } } } "#, ); assert_expansion(MacroKind::Items, &rules, r#"__cfg_if_items ! { ( rustdoc , ) ; ( ( ) ( # [ cfg ( any ( target_os = "redox" , unix ) ) ] # [ stable ( feature = "rust1" , since = "1.0.0" ) ] pub use sys :: ext as unix ; # [ cfg ( windows ) ] # [ stable ( feature = "rust1" , since = "1.0.0" ) ] pub use sys :: ext as windows ; # [ cfg ( any ( target_os = "linux" , target_os = "l4re" ) ) ] pub mod linux ; ) ) , }"#, "__cfg_if_items ! {(rustdoc ,) ;}"); } #[test] fn test_cfg_if_main() { // from https://github.com/rust-lang/rust/blob/3d211248393686e0f73851fc7548f6605220fbe1/src/libpanic_unwind/macros.rs#L9 let rules = create_rules( r#" macro_rules! cfg_if { ($( if #[cfg($($meta:meta),*)] { $($it:item)* } ) else * else { $($it2:item)* }) => { __cfg_if_items! { () ; $( ( ($($meta),*) ($($it)*) ), )* ( () ($($it2)*) ), } }; // Internal macro to Apply a cfg attribute to a list of items (@__apply $m:meta, $($it:item)*) => { $(#[$m] $it)* }; } "#, ); assert_expansion(MacroKind::Items, &rules, r#" cfg_if ! { if # [ cfg ( target_env = "msvc" ) ] { // no extra unwinder support needed } else if # [ cfg ( all ( target_arch = "wasm32" , not ( target_os = "emscripten" ) ) ) ] { // no unwinder on the system! } else { mod libunwind ; pub use libunwind :: * ; } } "#, "__cfg_if_items ! {() ; ((target_env = \"msvc\") ()) , ((all (target_arch = \"wasm32\" , not (target_os = \"emscripten\"))) ()) , (() (mod libunwind ; pub use libunwind :: * ;)) ,}"); assert_expansion(MacroKind::Items, &rules, r#" cfg_if ! { @ __apply cfg ( all ( not ( any ( not ( any ( target_os = "solaris" , target_os = "illumos" ) ) ) ) ) ) , } "#, "" ); } #[test] fn test_proptest_arbitrary() { // from https://github.com/AltSysrq/proptest/blob/d1c4b049337d2f75dd6f49a095115f7c532e5129/proptest/src/arbitrary/macros.rs#L16 let rules = create_rules( r#" macro_rules! arbitrary { ([$($bounds : tt)*] $typ: ty, $strat: ty, $params: ty; $args: ident => $logic: expr) => { impl<$($bounds)*> $crate::arbitrary::Arbitrary for $typ { type Parameters = $params; type Strategy = $strat; fn arbitrary_with($args: Self::Parameters) -> Self::Strategy { $logic } } }; }"#, ); assert_expansion(MacroKind::Items, &rules, r#"arbitrary ! ( [ A : Arbitrary ] Vec < A > , VecStrategy < A :: Strategy > , RangedParams1 < A :: Parameters > ; args => { let product_unpack ! [ range , a ] = args ; vec ( any_with :: < A > ( a ) , range ) } ) ;"#, "impl $crate :: arbitrary :: Arbitrary for Vec < A > {type Parameters = RangedParams1 < A :: Parameters > ; type Strategy = VecStrategy < A :: Strategy > ; fn arbitrary_with (args : Self :: Parameters) -> Self :: Strategy {{let product_unpack ! [range , a] = args ; vec (any_with :: < A > (a) , range)}}}"); } #[test] fn test_old_ridl() { // This is from winapi 2.8, which do not have a link from github // let rules = create_rules( r#" #[macro_export] macro_rules! RIDL { (interface $interface:ident ($vtbl:ident) : $pinterface:ident ($pvtbl:ident) {$( fn $method:ident(&mut self $(,$p:ident : $t:ty)*) -> $rtr:ty ),+} ) => { impl $interface { $(pub unsafe fn $method(&mut self) -> $rtr { ((*self.lpVtbl).$method)(self $(,$p)*) })+ } }; }"#, ); let expanded = expand(&rules, r#" RIDL!{interface ID3D11Asynchronous(ID3D11AsynchronousVtbl): ID3D11DeviceChild(ID3D11DeviceChildVtbl) { fn GetDataSize(&mut self) -> UINT }}"#); assert_eq!(expanded.to_string(), "impl ID3D11Asynchronous {pub unsafe fn GetDataSize (& mut self) -> UINT {((* self . lpVtbl) .GetDataSize) (self)}}"); } #[test] fn test_quick_error() { let rules = create_rules( r#" macro_rules! quick_error { (SORT [enum $name:ident $( #[$meta:meta] )*] items [$($( #[$imeta:meta] )* => $iitem:ident: $imode:tt [$( $ivar:ident: $ityp:ty ),*] {$( $ifuncs:tt )*} )* ] buf [ ] queue [ ] ) => { quick_error!(ENUM_DEFINITION [enum $name $( #[$meta] )*] body [] queue [$( $( #[$imeta] )* => $iitem: $imode [$( $ivar: $ityp ),*] )*] ); }; } "#, ); let expanded = expand( &rules, r#" quick_error ! (SORT [enum Wrapped # [derive (Debug)]] items [ => One : UNIT [] {} => Two : TUPLE [s :String] {display ("two: {}" , s) from ()} ] buf [] queue []) ; "#, ); assert_eq!(expanded.to_string(), "quick_error ! (ENUM_DEFINITION [enum Wrapped # [derive (Debug)]] body [] queue [=> One : UNIT [] => Two : TUPLE [s : String]]) ;"); } #[test] fn test_empty_repeat_vars_in_empty_repeat_vars() { let rules = create_rules(r#" macro_rules! delegate_impl { ([$self_type:ident, $self_wrap:ty, $self_map:ident] pub trait $name:ident $(: $sup:ident)* $(+ $more_sup:ident)* { // "Escaped" associated types. Stripped before making the `trait` // itself, but forwarded when delegating impls. $( @escape [type $assoc_name_ext:ident] // Associated types. Forwarded. )* $( @section type $( $(#[$_assoc_attr:meta])* type $assoc_name:ident $(: $assoc_bound:ty)*; )+ )* // Methods. Forwarded. Using $self_map!(self) around the self argument. // Methods must use receiver `self` or explicit type like `self: &Self` // &self and &mut self are _not_ supported. $( @section self $( $(#[$_method_attr:meta])* fn $method_name:ident(self $(: $self_selftype:ty)* $(,$marg:ident : $marg_ty:ty)*) -> $mret:ty; )+ )* // Arbitrary tail that is ignored when forwarding. $( @section nodelegate $($tail:tt)* )* }) => { impl<> $name for $self_wrap where $self_type: $name { $( $( fn $method_name(self $(: $self_selftype)* $(,$marg: $marg_ty)*) -> $mret { $self_map!(self).$method_name($($marg),*) } )* )* } } } "#); assert_expansion(MacroKind::Items, &rules, r#"delegate_impl ! {[G , & 'a mut G , deref] pub trait Data : GraphBase {@ section type type NodeWeight ;}}"#, "impl <> Data for & \'a mut G where G : Data {}"); }