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Use let chains in pretty_printing_compatibility_hack.

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To reduce indentation and improve readability.
This commit is contained in:
Nicholas Nethercote 2024-05-27 09:40:14 +10:00
parent d6d2ff055e
commit 3607cee3e7
1 changed files with 31 additions and 40 deletions
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71
compiler/rustc_expand/src/base.rs
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@ -1338,47 +1338,38 @@ pub fn parse_macro_name_and_helper_attrs(
/// FIXME(#73933): Remove this eventually.
fn pretty_printing_compatibility_hack(item: &Item, sess: &Session) -> bool {
let name = item.ident.name;
if name == sym::ProceduralMasqueradeDummyType {
if let ast::ItemKind::Enum(enum_def, _) = &item.kind {
if let [variant] = &*enum_def.variants {
if variant.ident.name == sym::Input {
let filename = sess.source_map().span_to_filename(item.ident.span);
if let FileName::Real(real) = filename {
if let Some(c) = real
.local_path()
.unwrap_or(Path::new(""))
.components()
.flat_map(|c| c.as_os_str().to_str())
.find(|c| c.starts_with("rental") || c.starts_with("allsorts-rental"))
{
let crate_matches = if c.starts_with("allsorts-rental") {
true
} else {
let mut version = c.trim_start_matches("rental-").split('.');
version.next() == Some("0")
&& version.next() == Some("5")
&& version
.next()
.and_then(|c| c.parse::<u32>().ok())
.is_some_and(|v| v < 6)
};
if name == sym::ProceduralMasqueradeDummyType
&& let ast::ItemKind::Enum(enum_def, _) = &item.kind
&& let [variant] = &*enum_def.variants
&& variant.ident.name == sym::Input
&& let FileName::Real(real) = sess.source_map().span_to_filename(item.ident.span)
&& let Some(c) = real
.local_path()
.unwrap_or(Path::new(""))
.components()
.flat_map(|c| c.as_os_str().to_str())
.find(|c| c.starts_with("rental") || c.starts_with("allsorts-rental"))
{
let crate_matches = if c.starts_with("allsorts-rental") {
true
} else {
let mut version = c.trim_start_matches("rental-").split('.');
version.next() == Some("0")
&& version.next() == Some("5")
&& version.next().and_then(|c| c.parse::<u32>().ok()).is_some_and(|v| v < 6)
};
if crate_matches {
sess.psess.buffer_lint(
PROC_MACRO_BACK_COMPAT,
item.ident.span,
ast::CRATE_NODE_ID,
BuiltinLintDiag::ProcMacroBackCompat {
crate_name: "rental".to_string(),
fixed_version: "0.5.6".to_string(),
},
);
return true;
}
}
}
}
}
if crate_matches {
sess.psess.buffer_lint(
PROC_MACRO_BACK_COMPAT,
item.ident.span,
ast::CRATE_NODE_ID,
BuiltinLintDiag::ProcMacroBackCompat {
crate_name: "rental".to_string(),
fixed_version: "0.5.6".to_string(),
},
);
return true;
}
}
false