use rustc_ast as ast; use rustc_ast::tokenstream::TokenStream; use rustc_parse::{new_parser_from_source_str, parser::Parser, source_file_to_stream}; use rustc_session::parse::ParseSess; use rustc_span::create_default_session_if_not_set_then; use rustc_span::source_map::{FilePathMapping, SourceMap}; use rustc_span::{BytePos, Span}; use rustc_data_structures::sync::Lrc; use rustc_errors::emitter::EmitterWriter; use rustc_errors::{Handler, MultiSpan, PResult}; use std::io; use std::io::prelude::*; use std::iter::Peekable; use std::path::{Path, PathBuf}; use std::str; use std::sync::{Arc, Mutex}; /// Map string to parser (via tts). fn string_to_parser(ps: &ParseSess, source_str: String) -> Parser<'_> { new_parser_from_source_str(ps, PathBuf::from("bogofile").into(), source_str) } pub(crate) fn with_error_checking_parse<'a, T, F>(s: String, ps: &'a ParseSess, f: F) -> T where F: FnOnce(&mut Parser<'a>) -> PResult<'a, T>, { let mut p = string_to_parser(&ps, s); let x = f(&mut p).unwrap(); p.sess.span_diagnostic.abort_if_errors(); x } /// Maps a string to tts, using a made-up filename. pub(crate) fn string_to_stream(source_str: String) -> TokenStream { let ps = ParseSess::new(FilePathMapping::empty()); source_file_to_stream( &ps, ps.source_map().new_source_file(PathBuf::from("bogofile").into(), source_str), None, ) .0 } /// Parses a string, returns a crate. pub(crate) fn string_to_crate(source_str: String) -> ast::Crate { let ps = ParseSess::new(FilePathMapping::empty()); with_error_checking_parse(source_str, &ps, |p| p.parse_crate_mod()) } /// Does the given string match the pattern? whitespace in the first string /// may be deleted or replaced with other whitespace to match the pattern. /// This function is relatively Unicode-ignorant; fortunately, the careful design /// of UTF-8 mitigates this ignorance. It doesn't do NKF-normalization(?). pub(crate) fn matches_codepattern(a: &str, b: &str) -> bool { let mut a_iter = a.chars().peekable(); let mut b_iter = b.chars().peekable(); loop { let (a, b) = match (a_iter.peek(), b_iter.peek()) { (None, None) => return true, (None, _) => return false, (Some(&a), None) => { if rustc_lexer::is_whitespace(a) { break; // Trailing whitespace check is out of loop for borrowck. } else { return false; } } (Some(&a), Some(&b)) => (a, b), }; if rustc_lexer::is_whitespace(a) && rustc_lexer::is_whitespace(b) { // Skip whitespace for `a` and `b`. scan_for_non_ws_or_end(&mut a_iter); scan_for_non_ws_or_end(&mut b_iter); } else if rustc_lexer::is_whitespace(a) { // Skip whitespace for `a`. scan_for_non_ws_or_end(&mut a_iter); } else if a == b { a_iter.next(); b_iter.next(); } else { return false; } } // Check if a has *only* trailing whitespace. a_iter.all(rustc_lexer::is_whitespace) } /// Advances the given peekable `Iterator` until it reaches a non-whitespace character. fn scan_for_non_ws_or_end>(iter: &mut Peekable) { while iter.peek().copied().map(rustc_lexer::is_whitespace) == Some(true) { iter.next(); } } /// Identifies a position in the text by the n'th occurrence of a string. struct Position { string: &'static str, count: usize, } struct SpanLabel { start: Position, end: Position, label: &'static str, } pub(crate) struct Shared { pub data: Arc>, } impl Write for Shared { fn write(&mut self, buf: &[u8]) -> io::Result { self.data.lock().unwrap().write(buf) } fn flush(&mut self) -> io::Result<()> { self.data.lock().unwrap().flush() } } fn test_harness(file_text: &str, span_labels: Vec, expected_output: &str) { create_default_session_if_not_set_then(|_| { let output = Arc::new(Mutex::new(Vec::new())); let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false); let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty())); source_map.new_source_file(Path::new("test.rs").to_owned().into(), file_text.to_owned()); let primary_span = make_span(&file_text, &span_labels[0].start, &span_labels[0].end); let mut msp = MultiSpan::from_span(primary_span); for span_label in span_labels { let span = make_span(&file_text, &span_label.start, &span_label.end); msp.push_span_label(span, span_label.label); println!("span: {:?} label: {:?}", span, span_label.label); println!("text: {:?}", source_map.span_to_snippet(span)); } let emitter = EmitterWriter::new( Box::new(Shared { data: output.clone() }), Some(source_map.clone()), None, fallback_bundle, false, false, false, None, false, ); let handler = Handler::with_emitter(true, None, Box::new(emitter)); handler.span_err(msp, "foo"); assert!( expected_output.chars().next() == Some('\n'), "expected output should begin with newline" ); let expected_output = &expected_output[1..]; let bytes = output.lock().unwrap(); let actual_output = str::from_utf8(&bytes).unwrap(); println!("expected output:\n------\n{}------", expected_output); println!("actual output:\n------\n{}------", actual_output); assert!(expected_output == actual_output) }) } fn make_span(file_text: &str, start: &Position, end: &Position) -> Span { let start = make_pos(file_text, start); let end = make_pos(file_text, end) + end.string.len(); // just after matching thing ends assert!(start <= end); Span::with_root_ctxt(BytePos(start as u32), BytePos(end as u32)) } fn make_pos(file_text: &str, pos: &Position) -> usize { let mut remainder = file_text; let mut offset = 0; for _ in 0..pos.count { if let Some(n) = remainder.find(&pos.string) { offset += n; remainder = &remainder[n + 1..]; } else { panic!("failed to find {} instances of {:?} in {:?}", pos.count, pos.string, file_text); } } offset } #[test] fn ends_on_col0() { test_harness( r#" fn foo() { } "#, vec![SpanLabel { start: Position { string: "{", count: 1 }, end: Position { string: "}", count: 1 }, label: "test", }], r#" error: foo --> test.rs:2:10 | 2 | fn foo() { | __________^ 3 | | } | |_^ test "#, ); } #[test] fn ends_on_col2() { test_harness( r#" fn foo() { } "#, vec![SpanLabel { start: Position { string: "{", count: 1 }, end: Position { string: "}", count: 1 }, label: "test", }], r#" error: foo --> test.rs:2:10 | 2 | fn foo() { | __________^ 3 | | 4 | | 5 | | } | |___^ test "#, ); } #[test] fn non_nested() { test_harness( r#" fn foo() { X0 Y0 X1 Y1 X2 Y2 } "#, vec![ SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X2", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "Y2", count: 1 }, label: "`Y` is a good letter too", }, ], r#" error: foo --> test.rs:3:3 | 3 | X0 Y0 | ____^__- | | ___| | || 4 | || X1 Y1 5 | || X2 Y2 | ||____^__- `Y` is a good letter too | |____| | `X` is a good letter "#, ); } #[test] fn nested() { test_harness( r#" fn foo() { X0 Y0 Y1 X1 } "#, vec![ SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X1", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "Y1", count: 1 }, label: "`Y` is a good letter too", }, ], r#" error: foo --> test.rs:3:3 | 3 | X0 Y0 | ____^__- | | ___| | || 4 | || Y1 X1 | ||____-__^ `X` is a good letter | |_____| | `Y` is a good letter too "#, ); } #[test] fn different_overlap() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 X2 Y2 Z2 X3 Y3 Z3 } "#, vec![ SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "X2", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Z1", count: 1 }, end: Position { string: "X3", count: 1 }, label: "`Y` is a good letter too", }, ], r#" error: foo --> test.rs:3:6 | 3 | X0 Y0 Z0 | ______^ 4 | | X1 Y1 Z1 | |_________- 5 | || X2 Y2 Z2 | ||____^ `X` is a good letter 6 | | X3 Y3 Z3 | |_____- `Y` is a good letter too "#, ); } #[test] fn triple_overlap() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 X2 Y2 Z2 } "#, vec![ SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X2", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "Y2", count: 1 }, label: "`Y` is a good letter too", }, SpanLabel { start: Position { string: "Z0", count: 1 }, end: Position { string: "Z2", count: 1 }, label: "`Z` label", }, ], r#" error: foo --> test.rs:3:3 | 3 | X0 Y0 Z0 | _____^__-__- | | ____|__| | || ___| | ||| 4 | ||| X1 Y1 Z1 5 | ||| X2 Y2 Z2 | |||____^__-__- `Z` label | ||____|__| | |____| `Y` is a good letter too | `X` is a good letter "#, ); } #[test] fn triple_exact_overlap() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 X2 Y2 Z2 } "#, vec![ SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X2", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X2", count: 1 }, label: "`Y` is a good letter too", }, SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X2", count: 1 }, label: "`Z` label", }, ], r#" error: foo --> test.rs:3:3 | 3 | / X0 Y0 Z0 4 | | X1 Y1 Z1 5 | | X2 Y2 Z2 | | ^ | | | | | `X` is a good letter | |____`Y` is a good letter too | `Z` label "#, ); } #[test] fn minimum_depth() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 X2 Y2 Z2 X3 Y3 Z3 } "#, vec![ SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "X1", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Y1", count: 1 }, end: Position { string: "Z2", count: 1 }, label: "`Y` is a good letter too", }, SpanLabel { start: Position { string: "X2", count: 1 }, end: Position { string: "Y3", count: 1 }, label: "`Z`", }, ], r#" error: foo --> test.rs:3:6 | 3 | X0 Y0 Z0 | ______^ 4 | | X1 Y1 Z1 | |____^_- | ||____| | | `X` is a good letter 5 | | X2 Y2 Z2 | |____-______- `Y` is a good letter too | ____| | | 6 | | X3 Y3 Z3 | |________- `Z` "#, ); } #[test] fn non_overlaping() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 X2 Y2 Z2 X3 Y3 Z3 } "#, vec![ SpanLabel { start: Position { string: "X0", count: 1 }, end: Position { string: "X1", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Y2", count: 1 }, end: Position { string: "Z3", count: 1 }, label: "`Y` is a good letter too", }, ], r#" error: foo --> test.rs:3:3 | 3 | / X0 Y0 Z0 4 | | X1 Y1 Z1 | |____^ `X` is a good letter 5 | X2 Y2 Z2 | ______- 6 | | X3 Y3 Z3 | |__________- `Y` is a good letter too "#, ); } #[test] fn overlaping_start_and_end() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 X2 Y2 Z2 X3 Y3 Z3 } "#, vec![ SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "X1", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Z1", count: 1 }, end: Position { string: "Z3", count: 1 }, label: "`Y` is a good letter too", }, ], r#" error: foo --> test.rs:3:6 | 3 | X0 Y0 Z0 | ______^ 4 | | X1 Y1 Z1 | |____^____- | ||____| | | `X` is a good letter 5 | | X2 Y2 Z2 6 | | X3 Y3 Z3 | |___________- `Y` is a good letter too "#, ); } #[test] fn multiple_labels_primary_without_message() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "", }, SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "`a` is a good letter", }, SpanLabel { start: Position { string: "c", count: 1 }, end: Position { string: "c", count: 1 }, label: "", }, ], r#" error: foo --> test.rs:3:7 | 3 | a { b { c } d } | ----^^^^-^^-- `a` is a good letter "#, ); } #[test] fn multiple_labels_secondary_without_message() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "`a` is a good letter", }, SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "", }, ], r#" error: foo --> test.rs:3:3 | 3 | a { b { c } d } | ^^^^-------^^ `a` is a good letter "#, ); } #[test] fn multiple_labels_primary_without_message_2() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "`b` is a good letter", }, SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "", }, SpanLabel { start: Position { string: "c", count: 1 }, end: Position { string: "c", count: 1 }, label: "", }, ], r#" error: foo --> test.rs:3:7 | 3 | a { b { c } d } | ----^^^^-^^-- | | | `b` is a good letter "#, ); } #[test] fn multiple_labels_secondary_without_message_2() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "", }, SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "`b` is a good letter", }, ], r#" error: foo --> test.rs:3:3 | 3 | a { b { c } d } | ^^^^-------^^ | | | `b` is a good letter "#, ); } #[test] fn multiple_labels_secondary_without_message_3() { test_harness( r#" fn foo() { a bc d } "#, vec![ SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "b", count: 1 }, label: "`a` is a good letter", }, SpanLabel { start: Position { string: "c", count: 1 }, end: Position { string: "d", count: 1 }, label: "", }, ], r#" error: foo --> test.rs:3:3 | 3 | a bc d | ^^^^---- | | | `a` is a good letter "#, ); } #[test] fn multiple_labels_without_message() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "", }, SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "", }, ], r#" error: foo --> test.rs:3:3 | 3 | a { b { c } d } | ^^^^-------^^ "#, ); } #[test] fn multiple_labels_without_message_2() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "", }, SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "", }, SpanLabel { start: Position { string: "c", count: 1 }, end: Position { string: "c", count: 1 }, label: "", }, ], r#" error: foo --> test.rs:3:7 | 3 | a { b { c } d } | ----^^^^-^^-- "#, ); } #[test] fn multiple_labels_with_message() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![ SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "`a` is a good letter", }, SpanLabel { start: Position { string: "b", count: 1 }, end: Position { string: "}", count: 1 }, label: "`b` is a good letter", }, ], r#" error: foo --> test.rs:3:3 | 3 | a { b { c } d } | ^^^^-------^^ | | | | | `b` is a good letter | `a` is a good letter "#, ); } #[test] fn single_label_with_message() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "`a` is a good letter", }], r#" error: foo --> test.rs:3:3 | 3 | a { b { c } d } | ^^^^^^^^^^^^^ `a` is a good letter "#, ); } #[test] fn single_label_without_message() { test_harness( r#" fn foo() { a { b { c } d } } "#, vec![SpanLabel { start: Position { string: "a", count: 1 }, end: Position { string: "d", count: 1 }, label: "", }], r#" error: foo --> test.rs:3:3 | 3 | a { b { c } d } | ^^^^^^^^^^^^^ "#, ); } #[test] fn long_snippet() { test_harness( r#" fn foo() { X0 Y0 Z0 X1 Y1 Z1 1 2 3 4 5 6 7 8 9 10 X2 Y2 Z2 X3 Y3 Z3 } "#, vec![ SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "X1", count: 1 }, label: "`X` is a good letter", }, SpanLabel { start: Position { string: "Z1", count: 1 }, end: Position { string: "Z3", count: 1 }, label: "`Y` is a good letter too", }, ], r#" error: foo --> test.rs:3:6 | 3 | X0 Y0 Z0 | ______^ 4 | | X1 Y1 Z1 | |____^____- | ||____| | | `X` is a good letter 5 | | 1 6 | | 2 7 | | 3 ... | 15 | | X2 Y2 Z2 16 | | X3 Y3 Z3 | |___________- `Y` is a good letter too "#, ); } #[test] fn long_snippet_multiple_spans() { test_harness( r#" fn foo() { X0 Y0 Z0 1 2 3 X1 Y1 Z1 4 5 6 X2 Y2 Z2 7 8 9 10 X3 Y3 Z3 } "#, vec![ SpanLabel { start: Position { string: "Y0", count: 1 }, end: Position { string: "Y3", count: 1 }, label: "`Y` is a good letter", }, SpanLabel { start: Position { string: "Z1", count: 1 }, end: Position { string: "Z2", count: 1 }, label: "`Z` is a good letter too", }, ], r#" error: foo --> test.rs:3:6 | 3 | X0 Y0 Z0 | ______^ 4 | | 1 5 | | 2 6 | | 3 7 | | X1 Y1 Z1 | |_________- 8 | || 4 9 | || 5 10 | || 6 11 | || X2 Y2 Z2 | ||__________- `Z` is a good letter too ... | 15 | | 10 16 | | X3 Y3 Z3 | |_______^ `Y` is a good letter "#, ); }