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simplify suggest_deref_ref_or_into

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This commit is contained in:
Takayuki Maeda 2022-07-15 14:29:15 +09:00
parent 1599c5a821
commit 45b88aff10
3 changed files with 49 additions and 47 deletions
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8
compiler/rustc_hir/src/hir.rs
View File

@ -1811,6 +1811,14 @@ pub fn is_approximately_pattern(&self) -> bool {
_ => false,
}
}
pub fn method_ident(&self) -> Option<Ident> {
match self.kind {
ExprKind::MethodCall(receiver_method, ..) => Some(receiver_method.ident),
ExprKind::Unary(_, expr) | ExprKind::AddrOf(.., expr) => expr.method_ident(),
_ => None,
}
}
}
/// Checks if the specified expression is a built-in range literal.

2
compiler/rustc_span/src/symbol.rs
View File

@ -1434,6 +1434,8 @@
thumb2,
thumb_mode: "thumb-mode",
tmm_reg,
to_string,
to_vec,
todo_macro,
tool_attributes,
tool_lints,

86
compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs
View File

@ -14,12 +14,10 @@
use rustc_infer::traits;
use rustc_middle::lint::in_external_macro;
use rustc_middle::ty::{self, Binder, IsSuggestable, Subst, ToPredicate, Ty};
use rustc_span::symbol::{sym, Ident};
use rustc_span::symbol::sym;
use rustc_span::Span;
use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
use std::iter;
impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
pub(in super::super) fn suggest_semicolon_at_end(&self, span: Span, err: &mut Diagnostic) {
err.span_suggestion_short(
@ -187,54 +185,48 @@ pub fn suggest_deref_ref_or_into(
err.span_label(self.tcx.def_span(def_id), &format!("{} defined here", found));
}
} else if !self.check_for_cast(err, expr, found, expected, expected_ty_expr) {
let struct_pat_shorthand_field = self.maybe_get_struct_pattern_shorthand_field(expr);
let methods = self.get_conversion_methods(expr.span, expected, found, expr.hir_id);
if !methods.is_empty() {
let mut suggestions = iter::zip(iter::repeat(&expr), &methods)
.filter_map(|(receiver_expr, method)| {
let method_call = format!(".{}()", method.name);
fn method_ident(expr: &hir::Expr<'_>) -> Option<Ident> {
match expr.kind {
ExprKind::MethodCall(receiver_method, ..) => Some(receiver_method.ident),
ExprKind::Unary(_, expr) | ExprKind::AddrOf(.., expr) => method_ident(expr),
_ => None
}
}
let method_ident = method_ident(&receiver_expr);
if let Some(method_ident) = method_ident
&& method_ident.name == method.name
let mut suggestions = methods.iter()
.filter_map(|conversion_method| {
let receiver_method_ident = expr.method_ident();
if let Some(method_ident) = receiver_method_ident
&& method_ident.name == conversion_method.name
{
None // do not suggest code that is already there (#53348)
} else {
let method_call_list = [".to_vec()", ".to_string()"];
let mut sugg = if let ExprKind::MethodCall(receiver_method, ..) = receiver_expr.kind
&& receiver_method.ident.name == sym::clone
&& method_call_list.contains(&method_call.as_str())
{
vec![(
receiver_method.ident.span,
method.name.to_string()
)]
} else {
if expr.precedence().order()
< ExprPrecedence::MethodCall.order()
{
vec![
(expr.span.shrink_to_lo(), "(".to_string()),
(expr.span.shrink_to_hi(), format!("){}", method_call)),
]
} else {
vec![(expr.span.shrink_to_hi(), method_call)]
}
};
if let Some(name) = struct_pat_shorthand_field {
sugg.insert(
0,
(expr.span.shrink_to_lo(), format!("{}: ", name)),
);
}
Some(sugg)
return None // do not suggest code that is already there (#53348)
}
let method_call_list = [sym::to_vec, sym::to_string];
let mut sugg = if let ExprKind::MethodCall(receiver_method, ..) = expr.kind
&& receiver_method.ident.name == sym::clone
&& method_call_list.contains(&conversion_method.name)
// If receiver is `.clone()` and found type has one of those methods,
// we guess that the user wants to convert from a slice type (`&[]` or `&str`)
// to an owned type (`Vec` or `String`). These conversions clone internally,
// so we remove the user's `clone` call.
{
vec![(
receiver_method.ident.span,
conversion_method.name.to_string()
)]
} else if expr.precedence().order()
< ExprPrecedence::MethodCall.order()
{
vec![
(expr.span.shrink_to_lo(), "(".to_string()),
(expr.span.shrink_to_hi(), format!(").{}()", conversion_method.name)),
]
} else {
vec![(expr.span.shrink_to_hi(), format!(".{}()", conversion_method.name))]
};
let struct_pat_shorthand_field = self.maybe_get_struct_pattern_shorthand_field(expr);
if let Some(name) = struct_pat_shorthand_field {
sugg.insert(
0,
(expr.span.shrink_to_lo(), format!("{}: ", name)),
);
}
Some(sugg)
})
.peekable();
if suggestions.peek().is_some() {