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|
use std::fmt::Write;
use std::path::{PathBuf, Path};
use std::fs;
use ra_db::{SyntaxDatabase};
use ra_syntax::ast::{self, AstNode};
use test_utils::{project_dir, assert_eq_text, read_text};
use crate::{
source_binder,
mock::MockDatabase,
};
// These tests compare the inference results for all expressions in a file
// against snapshots of the current results. If you change something and these
// tests fail expectedly, you can update the comparison files by deleting them
// and running the tests again. Similarly, to add a new test, just write the
// test here in the same pattern and it will automatically write the snapshot.
#[test]
fn infer_basics() {
check_inference(
r#"
fn test(a: u32, b: isize, c: !, d: &str) {
a;
b;
c;
d;
1usize;
1isize;
"test";
1.0f32;
}"#,
"0001_basics.txt",
);
}
#[test]
fn infer_let() {
check_inference(
r#"
fn test() {
let a = 1isize;
let b: usize = 1;
let c = b;
}
}"#,
"0002_let.txt",
);
}
#[test]
fn infer_paths() {
check_inference(
r#"
fn a() -> u32 { 1 }
mod b {
fn c() -> u32 { 1 }
}
fn test() {
a();
b::c();
}
}"#,
"0003_paths.txt",
);
}
#[test]
fn infer_struct() {
check_inference(
r#"
struct A {
b: B,
c: C,
}
struct B;
struct C(usize);
fn test() {
let c = C(1);
B;
let a: A = A { b: B, c: C(1) };
a.b;
a.c;
}
"#,
"0004_struct.txt",
);
}
#[test]
fn infer_refs_and_ptrs() {
check_inference(
r#"
fn test(a: &u32, b: &mut u32, c: *const u32, d: *mut u32) {
a;
*a;
&a;
&mut a;
b;
*b;
&b;
c;
*c;
d;
*d;
}
"#,
"0005_refs.txt",
);
}
#[test]
fn infer_backwards() {
check_inference(
r#"
fn takes_u32(x: u32) {}
struct S { i32_field: i32 }
fn test() -> &mut &f64 {
let a = unknown_function();
takes_u32(a);
let b = unknown_function();
S { i32_field: b };
let c = unknown_function();
&mut &c
}
"#,
"0006_backwards.txt",
);
}
fn infer(content: &str) -> String {
let (db, _, file_id) = MockDatabase::with_single_file(content);
let source_file = db.source_file(file_id);
let mut acc = String::new();
for fn_def in source_file
.syntax()
.descendants()
.filter_map(ast::FnDef::cast)
{
let func = source_binder::function_from_source(&db, file_id, fn_def)
.unwrap()
.unwrap();
let inference_result = func.infer(&db).unwrap();
for (syntax_ptr, ty) in &inference_result.type_of {
let node = syntax_ptr.resolve(&source_file);
write!(
acc,
"{} '{}': {}\n",
syntax_ptr.range(),
ellipsize(node.text().to_string().replace("\n", " "), 15),
ty
)
.unwrap();
}
}
acc
}
fn check_inference(content: &str, data_file: impl AsRef<Path>) {
let data_file_path = test_data_dir().join(data_file);
let result = infer(content);
if !data_file_path.exists() {
println!("File with expected result doesn't exist, creating...\n");
println!("{}\n{}", content, result);
fs::write(&data_file_path, &result).unwrap();
panic!("File {:?} with expected result was created", data_file_path);
}
let expected = read_text(&data_file_path);
assert_eq_text!(&expected, &result);
}
fn ellipsize(mut text: String, max_len: usize) -> String {
if text.len() <= max_len {
return text;
}
let ellipsis = "...";
let e_len = ellipsis.len();
let mut prefix_len = (max_len - e_len) / 2;
while !text.is_char_boundary(prefix_len) {
prefix_len += 1;
}
let mut suffix_len = max_len - e_len - prefix_len;
while !text.is_char_boundary(text.len() - suffix_len) {
suffix_len += 1;
}
text.replace_range(prefix_len..text.len() - suffix_len, ellipsis);
text
}
fn test_data_dir() -> PathBuf {
project_dir().join("crates/ra_hir/src/ty/tests/data")
}
|
