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|
use ra_cfg::CfgOptions;
use rustc_hash::FxHashMap;
use stdx::split1;
#[derive(Debug, Eq, PartialEq)]
pub struct FixtureEntry {
pub path: String,
pub text: String,
pub crate_name: Option<String>,
pub deps: Vec<String>,
pub cfg: CfgOptions,
pub edition: Option<String>,
pub env: FxHashMap<String, String>,
}
/// Parses text which looks like this:
///
/// ```not_rust
/// //- some meta
/// line 1
/// line 2
/// // - other meta
/// ```
pub fn parse_fixture(ra_fixture: &str) -> Vec<FixtureEntry> {
let fixture = indent_first_line(ra_fixture);
let margin = fixture_margin(&fixture);
let mut lines = fixture
.split('\n') // don't use `.lines` to not drop `\r\n`
.enumerate()
.filter_map(|(ix, line)| {
if line.len() >= margin {
assert!(line[..margin].trim().is_empty());
let line_content = &line[margin..];
if !line_content.starts_with("//-") {
assert!(
!line_content.contains("//-"),
r#"Metadata line {} has invalid indentation. All metadata lines need to have the same indentation.
The offending line: {:?}"#,
ix,
line
);
}
Some(line_content)
} else {
assert!(line.trim().is_empty());
None
}
});
let mut res: Vec<FixtureEntry> = Vec::new();
for line in lines.by_ref() {
if line.starts_with("//-") {
let meta = line["//-".len()..].trim().to_string();
let meta = parse_meta(&meta);
res.push(meta)
} else if let Some(entry) = res.last_mut() {
entry.text.push_str(line);
entry.text.push('\n');
}
}
res
}
//- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b env:OUTDIR=path/to,OTHER=foo
fn parse_meta(meta: &str) -> FixtureEntry {
let components = meta.split_ascii_whitespace().collect::<Vec<_>>();
let path = components[0].to_string();
assert!(path.starts_with("/"));
let mut krate = None;
let mut deps = Vec::new();
let mut edition = None;
let mut cfg = CfgOptions::default();
let mut env = FxHashMap::default();
for component in components[1..].iter() {
let (key, value) = split1(component, ':').unwrap();
match key {
"crate" => krate = Some(value.to_string()),
"deps" => deps = value.split(',').map(|it| it.to_string()).collect(),
"edition" => edition = Some(value.to_string()),
"cfg" => {
for key in value.split(',') {
match split1(key, '=') {
None => cfg.insert_atom(key.into()),
Some((k, v)) => cfg.insert_key_value(k.into(), v.into()),
}
}
}
"env" => {
for key in value.split(',') {
if let Some((k, v)) = split1(key, '=') {
env.insert(k.into(), v.into());
}
}
}
_ => panic!("bad component: {:?}", component),
}
}
FixtureEntry { path, text: String::new(), crate_name: krate, deps, edition, cfg, env }
}
/// Adjusts the indentation of the first line to the minimum indentation of the rest of the lines.
/// This allows fixtures to start off in a different indentation, e.g. to align the first line with
/// the other lines visually:
/// ```
/// let fixture = "//- /lib.rs
/// mod foo;
/// //- /foo.rs
/// fn bar() {}
/// ";
/// assert_eq!(fixture_margin(fixture),
/// " //- /lib.rs
/// mod foo;
/// //- /foo.rs
/// fn bar() {}
/// ")
/// ```
fn indent_first_line(fixture: &str) -> String {
if fixture.is_empty() {
return String::new();
}
let mut lines = fixture.lines();
let first_line = lines.next().unwrap();
if first_line.contains("//-") {
let rest = lines.collect::<Vec<_>>().join("\n");
let fixed_margin = fixture_margin(&rest);
let fixed_indent = fixed_margin - indent_len(first_line);
format!("\n{}{}\n{}", " ".repeat(fixed_indent), first_line, rest)
} else {
fixture.to_owned()
}
}
fn fixture_margin(fixture: &str) -> usize {
fixture
.lines()
.filter(|it| it.trim_start().starts_with("//-"))
.map(indent_len)
.next()
.expect("empty fixture")
}
fn indent_len(s: &str) -> usize {
s.len() - s.trim_start().len()
}
#[test]
#[should_panic]
fn parse_fixture_checks_further_indented_metadata() {
parse_fixture(
r"
//- /lib.rs
mod bar;
fn foo() {}
//- /bar.rs
pub fn baz() {}
",
);
}
#[test]
fn parse_fixture_can_handle_dedented_first_line() {
let fixture = "//- /lib.rs
mod foo;
//- /foo.rs
struct Bar;
";
assert_eq!(
parse_fixture(fixture),
parse_fixture(
"//- /lib.rs
mod foo;
//- /foo.rs
struct Bar;
"
)
)
}
#[test]
fn parse_fixture_gets_full_meta() {
let parsed = parse_fixture(
r"
//- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b,atom env:OUTDIR=path/to,OTHER=foo
mod m;
",
);
assert_eq!(1, parsed.len());
let meta = &parsed[0];
assert_eq!("mod m;\n\n", meta.text);
assert_eq!("foo", meta.crate_name.as_ref().unwrap());
assert_eq!("/lib.rs", meta.path);
assert_eq!(2, meta.env.len());
}
|
