53 lines
1.6 KiB
Rust
53 lines
1.6 KiB
Rust
use crate::source::snippet;
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use crate::visitors::{for_each_expr, Descend};
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use crate::{path_to_local_id, strip_pat_refs};
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use core::ops::ControlFlow;
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use rustc_hir::{Body, BodyId, ExprKind, HirId, PatKind};
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use rustc_lint::LateContext;
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use rustc_span::Span;
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use std::borrow::Cow;
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pub fn get_spans(
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cx: &LateContext<'_>,
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opt_body_id: Option<BodyId>,
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idx: usize,
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replacements: &[(&'static str, &'static str)],
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) -> Option<Vec<(Span, Cow<'static, str>)>> {
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if let Some(body) = opt_body_id.map(|id| cx.tcx.hir().body(id)) {
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if let PatKind::Binding(_, binding_id, _, _) = strip_pat_refs(body.params[idx].pat).kind {
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extract_clone_suggestions(cx, binding_id, replacements, body)
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} else {
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Some(vec![])
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}
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} else {
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Some(vec![])
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}
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}
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fn extract_clone_suggestions<'tcx>(
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cx: &LateContext<'tcx>,
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id: HirId,
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replace: &[(&'static str, &'static str)],
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body: &'tcx Body<'_>,
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) -> Option<Vec<(Span, Cow<'static, str>)>> {
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let mut spans = Vec::new();
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for_each_expr(body, |e| {
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if let ExprKind::MethodCall(seg, recv, [], _) = e.kind
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&& path_to_local_id(recv, id)
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{
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if seg.ident.as_str() == "capacity" {
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return ControlFlow::Break(());
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}
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for &(fn_name, suffix) in replace {
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if seg.ident.as_str() == fn_name {
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spans.push((e.span, snippet(cx, recv.span, "_") + suffix));
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return ControlFlow::Continue(Descend::No);
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}
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}
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}
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ControlFlow::Continue(Descend::Yes)
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})
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.is_none()
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.then_some(spans)
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}
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