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rust/compiler/rustc_expand/src/tests.rs
Guillaume Gomez a2654fb64c Rework SESSION_GLOBALS API to prevent overwriting it
2021-07-08 16:16:28 +02:00

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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, MultiSpan, Span};
use rustc_data_structures::sync::Lrc;
use rustc_errors::emitter::EmitterWriter;
use rustc_errors::{Handler, 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)
}
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.
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.
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(?).
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<I: Iterator<Item = char>>(iter: &mut Peekable<I>) {
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,
}
crate struct Shared<T: Write> {
pub data: Arc<Mutex<T>>,
}
impl<T: Write> Write for Shared<T> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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<SpanLabel>, expected_output: &str) {
create_default_session_if_not_set_then(|_| {
let output = Arc::new(Mutex::new(Vec::new()));
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.to_string());
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()),
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
"#,
);
}
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