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manual_split_once: lint manual iteration of SplitN
This commit is contained in:
Alex Macleod
parent
a9d31e71be
commit
4424aa444c
@ -2009,13 +2009,27 @@ declare_clippy_lint! {
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/// ### Example
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/// ```rust,ignore
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/// // Bad
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/// let (key, value) = _.splitn(2, '=').next_tuple()?;
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/// let value = _.splitn(2, '=').nth(1)?;
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/// let s = "key=value=add";
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/// let (key, value) = s.splitn(2, '=').next_tuple()?;
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/// let value = s.splitn(2, '=').nth(1)?;
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///
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/// // Good
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/// let (key, value) = _.split_once('=')?;
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/// let value = _.split_once('=')?.1;
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/// let mut parts = s.splitn(2, '=');
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/// let key = parts.next()?;
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/// let value = parts.next()?;
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/// ```
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/// Use instead:
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/// ```rust,ignore
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/// // Good
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/// let s = "key=value=add";
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/// let (key, value) = s.split_once('=')?;
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/// let value = s.split_once('=')?.1;
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///
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/// let (key, value) = s.split_once('=')?;
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/// ```
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///
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/// ### Limitations
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/// The multiple statement variant currently only detects `iter.next()?`/`iter.next().unwrap()`
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/// in two separate `let` statements that immediately follow the `splitn()`
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#[clippy::version = "1.57.0"]
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pub MANUAL_SPLIT_ONCE,
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complexity,
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@ -1,14 +1,19 @@
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use clippy_utils::consts::{constant, Constant};
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
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use clippy_utils::source::snippet_with_context;
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use clippy_utils::{is_diag_item_method, match_def_path, meets_msrv, msrvs, paths};
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use clippy_utils::usage::local_used_after_expr;
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use clippy_utils::visitors::expr_visitor;
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use clippy_utils::{is_diag_item_method, match_def_path, meets_msrv, msrvs, path_to_local_id, paths};
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use if_chain::if_chain;
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use rustc_errors::Applicability;
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use rustc_hir::{Expr, ExprKind, HirId, LangItem, Node, QPath};
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use rustc_hir::intravisit::Visitor;
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use rustc_hir::{
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BindingAnnotation, Expr, ExprKind, HirId, LangItem, Local, MatchSource, Node, Pat, PatKind, QPath, Stmt, StmtKind,
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};
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use rustc_lint::LateContext;
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use rustc_middle::ty;
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use rustc_semver::RustcVersion;
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use rustc_span::{symbol::sym, Span, SyntaxContext};
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use rustc_span::{sym, Span, Symbol, SyntaxContext};
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use super::{MANUAL_SPLIT_ONCE, NEEDLESS_SPLITN};
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@ -25,40 +30,41 @@ pub(super) fn check(
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return;
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}
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let ctxt = expr.span.ctxt();
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let Some(usage) = parse_iter_usage(cx, ctxt, cx.tcx.hir().parent_iter(expr.hir_id)) else { return };
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let needless = match usage.kind {
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let needless = |usage_kind| match usage_kind {
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IterUsageKind::Nth(n) => count > n + 1,
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IterUsageKind::NextTuple => count > 2,
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};
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let manual = count == 2 && meets_msrv(msrv, &msrvs::STR_SPLIT_ONCE);
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if needless {
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let mut app = Applicability::MachineApplicable;
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let (r, message) = if method_name == "splitn" {
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("", "unnecessary use of `splitn`")
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} else {
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("r", "unnecessary use of `rsplitn`")
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};
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span_lint_and_sugg(
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cx,
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NEEDLESS_SPLITN,
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expr.span,
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message,
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"try this",
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format!(
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"{}.{r}split({})",
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snippet_with_context(cx, self_arg.span, ctxt, "..", &mut app).0,
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snippet_with_context(cx, pat_arg.span, ctxt, "..", &mut app).0,
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),
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app,
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);
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} else if count == 2 && meets_msrv(msrv, &msrvs::STR_SPLIT_ONCE) {
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check_manual_split_once(cx, method_name, expr, self_arg, pat_arg, &usage);
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match parse_iter_usage(cx, expr.span.ctxt(), cx.tcx.hir().parent_iter(expr.hir_id)) {
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Some(usage) if needless(usage.kind) => lint_needless(cx, method_name, expr, self_arg, pat_arg),
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Some(usage) if manual => check_manual_split_once(cx, method_name, expr, self_arg, pat_arg, &usage),
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None if manual => {
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check_manual_split_once_indirect(cx, method_name, expr, self_arg, pat_arg);
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},
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_ => {},
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}
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}
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fn lint_needless(cx: &LateContext<'_>, method_name: &str, expr: &Expr<'_>, self_arg: &Expr<'_>, pat_arg: &Expr<'_>) {
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let mut app = Applicability::MachineApplicable;
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let r = if method_name == "splitn" { "" } else { "r" };
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span_lint_and_sugg(
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cx,
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NEEDLESS_SPLITN,
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expr.span,
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&format!("unnecessary use of `{r}splitn`"),
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"try this",
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format!(
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"{}.{r}split({})",
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snippet_with_context(cx, self_arg.span, expr.span.ctxt(), "..", &mut app).0,
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snippet_with_context(cx, pat_arg.span, expr.span.ctxt(), "..", &mut app).0,
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),
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app,
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);
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}
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fn check_manual_split_once(
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cx: &LateContext<'_>,
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method_name: &str,
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@ -107,16 +113,171 @@ fn check_manual_split_once(
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span_lint_and_sugg(cx, MANUAL_SPLIT_ONCE, usage.span, msg, "try this", sugg, app);
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}
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/// checks for
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///
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/// ```
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/// let mut iter = "a.b.c".splitn(2, '.');
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/// let a = iter.next();
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/// let b = iter.next();
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/// ```
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fn check_manual_split_once_indirect(
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cx: &LateContext<'_>,
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method_name: &str,
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expr: &Expr<'_>,
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self_arg: &Expr<'_>,
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pat_arg: &Expr<'_>,
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) -> Option<()> {
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let ctxt = expr.span.ctxt();
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let mut parents = cx.tcx.hir().parent_iter(expr.hir_id);
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if let (_, Node::Local(local)) = parents.next()?
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&& let PatKind::Binding(BindingAnnotation::Mutable, iter_binding_id, iter_ident, None) = local.pat.kind
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&& let (iter_stmt_id, Node::Stmt(_)) = parents.next()?
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&& let (_, Node::Block(enclosing_block)) = parents.next()?
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&& let mut stmts = enclosing_block
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.stmts
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.iter()
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.skip_while(|stmt| stmt.hir_id != iter_stmt_id)
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.skip(1)
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&& let first = indirect_usage(cx, stmts.next()?, iter_binding_id, ctxt)?
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&& let second = indirect_usage(cx, stmts.next()?, iter_binding_id, ctxt)?
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&& first.unwrap_kind == second.unwrap_kind
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&& first.name != second.name
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&& !local_used_after_expr(cx, iter_binding_id, second.init_expr)
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{
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let (r, lhs, rhs) = if method_name == "splitn" {
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("", first.name, second.name)
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} else {
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("r", second.name, first.name)
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};
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let msg = format!("manual implementation of `{r}split_once`");
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let mut app = Applicability::MachineApplicable;
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let self_snip = snippet_with_context(cx, self_arg.span, ctxt, "..", &mut app).0;
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let pat_snip = snippet_with_context(cx, pat_arg.span, ctxt, "..", &mut app).0;
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span_lint_and_then(cx, MANUAL_SPLIT_ONCE, local.span, &msg, |diag| {
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diag.span_label(first.span, "first usage here");
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diag.span_label(second.span, "second usage here");
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let unwrap = match first.unwrap_kind {
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UnwrapKind::Unwrap => ".unwrap()",
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UnwrapKind::QuestionMark => "?",
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};
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diag.span_suggestion_verbose(
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local.span,
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&format!("try `{r}split_once`"),
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format!("let ({lhs}, {rhs}) = {self_snip}.{r}split_once({pat_snip}){unwrap};"),
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app,
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);
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let remove_msg = format!("remove the `{iter_ident}` usages");
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diag.span_suggestion(
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first.span,
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&remove_msg,
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String::new(),
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app,
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);
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diag.span_suggestion(
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second.span,
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&remove_msg,
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String::new(),
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app,
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);
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});
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}
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Some(())
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}
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#[derive(Debug)]
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struct IndirectUsage<'a> {
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name: Symbol,
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span: Span,
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init_expr: &'a Expr<'a>,
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unwrap_kind: UnwrapKind,
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}
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/// returns `Some(IndirectUsage)` for e.g.
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///
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/// ```ignore
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/// let name = binding.next()?;
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/// let name = binding.next().unwrap();
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/// ```
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fn indirect_usage<'tcx>(
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cx: &LateContext<'tcx>,
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stmt: &Stmt<'tcx>,
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binding: HirId,
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ctxt: SyntaxContext,
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) -> Option<IndirectUsage<'tcx>> {
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if let StmtKind::Local(Local {
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pat:
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Pat {
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kind: PatKind::Binding(BindingAnnotation::Unannotated, _, ident, None),
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..
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},
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init: Some(init_expr),
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hir_id: local_hir_id,
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..
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}) = stmt.kind
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{
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let mut path_to_binding = None;
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expr_visitor(cx, |expr| {
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if path_to_local_id(expr, binding) {
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path_to_binding = Some(expr);
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}
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path_to_binding.is_none()
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})
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.visit_expr(init_expr);
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let mut parents = cx.tcx.hir().parent_iter(path_to_binding?.hir_id);
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let iter_usage = parse_iter_usage(cx, ctxt, &mut parents)?;
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let (parent_id, _) = parents.find(|(_, node)| {
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!matches!(
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node,
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Node::Expr(Expr {
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kind: ExprKind::Match(.., MatchSource::TryDesugar),
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..
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})
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)
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})?;
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if let IterUsage {
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kind: IterUsageKind::Nth(0),
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unwrap_kind: Some(unwrap_kind),
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..
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} = iter_usage
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{
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if parent_id == *local_hir_id {
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return Some(IndirectUsage {
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name: ident.name,
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span: stmt.span,
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init_expr,
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unwrap_kind,
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});
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}
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}
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}
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None
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}
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#[derive(Debug, Clone, Copy)]
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enum IterUsageKind {
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Nth(u128),
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NextTuple,
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}
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#[derive(Debug, PartialEq)]
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enum UnwrapKind {
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Unwrap,
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QuestionMark,
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}
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#[derive(Debug)]
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struct IterUsage {
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kind: IterUsageKind,
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unwrap_kind: Option<UnwrapKind>,
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@ -2,7 +2,7 @@
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#![feature(custom_inner_attributes)]
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#![warn(clippy::manual_split_once)]
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#![allow(clippy::iter_skip_next, clippy::iter_nth_zero)]
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#![allow(unused, clippy::iter_skip_next, clippy::iter_nth_zero)]
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extern crate itertools;
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@ -41,13 +41,107 @@ fn main() {
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let _ = s.rsplit_once('=').map(|x| x.0);
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}
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fn indirect() -> Option<()> {
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let (l, r) = "a.b.c".split_once('.').unwrap();
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let (l, r) = "a.b.c".split_once('.')?;
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let (l, r) = "a.b.c".rsplit_once('.').unwrap();
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let (l, r) = "a.b.c".rsplit_once('.')?;
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// could lint, currently doesn't
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let mut iter = "a.b.c".splitn(2, '.');
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let other = 1;
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let l = iter.next()?;
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let mut mut_binding = iter.next()?;
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let tuple = (iter.next()?, iter.next()?);
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// should not lint
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let mut missing_unwrap = "a.b.c".splitn(2, '.');
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let l = missing_unwrap.next();
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let r = missing_unwrap.next();
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let mut mixed_unrap = "a.b.c".splitn(2, '.');
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let unwrap = mixed_unrap.next().unwrap();
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let question_mark = mixed_unrap.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let same_name = iter.next()?;
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let same_name = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let shadows_existing = "d";
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let shadows_existing = iter.next()?;
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let becomes_shadowed = iter.next()?;
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let becomes_shadowed = "d";
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let l = iter.next()?;
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let r = iter.next()?;
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let third_usage = iter.next()?;
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let mut n_three = "a.b.c".splitn(3, '.');
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let l = n_three.next()?;
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let r = n_three.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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{
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let in_block = iter.next()?;
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}
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let r = iter.next()?;
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let mut lacks_binding = "a.b.c".splitn(2, '.');
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let _ = lacks_binding.next()?;
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let r = lacks_binding.next()?;
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let mut mapped = "a.b.c".splitn(2, '.').map(|_| "~");
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let l = iter.next()?;
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let r = iter.next()?;
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let mut assigned = "";
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let mut iter = "a.b.c".splitn(2, '.');
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let l = iter.next()?;
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assigned = iter.next()?;
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None
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}
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fn _msrv_1_51() {
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#![clippy::msrv = "1.51"]
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// `str::split_once` was stabilized in 1.52. Do not lint this
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let _ = "key=value".splitn(2, '=').nth(1).unwrap();
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let mut iter = "a.b.c".splitn(2, '.');
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let a = iter.next().unwrap();
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let b = iter.next().unwrap();
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}
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fn _msrv_1_52() {
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#![clippy::msrv = "1.52"]
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let _ = "key=value".split_once('=').unwrap().1;
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let (a, b) = "a.b.c".split_once('.').unwrap();
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}
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@ -2,7 +2,7 @@
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#![feature(custom_inner_attributes)]
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#![warn(clippy::manual_split_once)]
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#![allow(clippy::iter_skip_next, clippy::iter_nth_zero)]
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#![allow(unused, clippy::iter_skip_next, clippy::iter_nth_zero)]
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extern crate itertools;
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@ -41,13 +41,107 @@ fn main() {
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let _ = s.rsplitn(2, '=').nth(1);
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}
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fn indirect() -> Option<()> {
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let mut iter = "a.b.c".splitn(2, '.');
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let l = iter.next().unwrap();
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let r = iter.next().unwrap();
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let mut iter = "a.b.c".splitn(2, '.');
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let l = iter.next()?;
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let r = iter.next()?;
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|
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let mut iter = "a.b.c".rsplitn(2, '.');
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let r = iter.next().unwrap();
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let l = iter.next().unwrap();
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let mut iter = "a.b.c".rsplitn(2, '.');
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let r = iter.next()?;
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let l = iter.next()?;
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// could lint, currently doesn't
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let mut iter = "a.b.c".splitn(2, '.');
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let other = 1;
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let l = iter.next()?;
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let r = iter.next()?;
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|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let mut mut_binding = iter.next()?;
|
||||
let r = iter.next()?;
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let tuple = (iter.next()?, iter.next()?);
|
||||
|
||||
// should not lint
|
||||
|
||||
let mut missing_unwrap = "a.b.c".splitn(2, '.');
|
||||
let l = missing_unwrap.next();
|
||||
let r = missing_unwrap.next();
|
||||
|
||||
let mut mixed_unrap = "a.b.c".splitn(2, '.');
|
||||
let unwrap = mixed_unrap.next().unwrap();
|
||||
let question_mark = mixed_unrap.next()?;
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let same_name = iter.next()?;
|
||||
let same_name = iter.next()?;
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let shadows_existing = "d";
|
||||
let shadows_existing = iter.next()?;
|
||||
let r = iter.next()?;
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let becomes_shadowed = iter.next()?;
|
||||
let becomes_shadowed = "d";
|
||||
let r = iter.next()?;
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let l = iter.next()?;
|
||||
let r = iter.next()?;
|
||||
let third_usage = iter.next()?;
|
||||
|
||||
let mut n_three = "a.b.c".splitn(3, '.');
|
||||
let l = n_three.next()?;
|
||||
let r = n_three.next()?;
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
{
|
||||
let in_block = iter.next()?;
|
||||
}
|
||||
let r = iter.next()?;
|
||||
|
||||
let mut lacks_binding = "a.b.c".splitn(2, '.');
|
||||
let _ = lacks_binding.next()?;
|
||||
let r = lacks_binding.next()?;
|
||||
|
||||
let mut mapped = "a.b.c".splitn(2, '.').map(|_| "~");
|
||||
let l = iter.next()?;
|
||||
let r = iter.next()?;
|
||||
|
||||
let mut assigned = "";
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let l = iter.next()?;
|
||||
assigned = iter.next()?;
|
||||
|
||||
None
|
||||
}
|
||||
|
||||
fn _msrv_1_51() {
|
||||
#![clippy::msrv = "1.51"]
|
||||
// `str::split_once` was stabilized in 1.52. Do not lint this
|
||||
let _ = "key=value".splitn(2, '=').nth(1).unwrap();
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let a = iter.next().unwrap();
|
||||
let b = iter.next().unwrap();
|
||||
}
|
||||
|
||||
fn _msrv_1_52() {
|
||||
#![clippy::msrv = "1.52"]
|
||||
let _ = "key=value".splitn(2, '=').nth(1).unwrap();
|
||||
|
||||
let mut iter = "a.b.c".splitn(2, '.');
|
||||
let a = iter.next().unwrap();
|
||||
let b = iter.next().unwrap();
|
||||
}
|
||||
|
||||
@ -79,10 +79,135 @@ LL | let _ = s.rsplitn(2, '=').nth(1);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.rsplit_once('=').map(|x| x.0)`
|
||||
|
||||
error: manual implementation of `split_once`
|
||||
--> $DIR/manual_split_once.rs:52:13
|
||||
--> $DIR/manual_split_once.rs:45:5
|
||||
|
|
||||
LL | let mut iter = "a.b.c".splitn(2, '.');
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL | let l = iter.next().unwrap();
|
||||
| ----------------------------- first usage here
|
||||
LL | let r = iter.next().unwrap();
|
||||
| ----------------------------- second usage here
|
||||
|
|
||||
help: try `split_once`
|
||||
|
|
||||
LL | let (l, r) = "a.b.c".split_once('.').unwrap();
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let l = iter.next().unwrap();
|
||||
LL +
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let r = iter.next().unwrap();
|
||||
LL +
|
||||
|
|
||||
|
||||
error: manual implementation of `split_once`
|
||||
--> $DIR/manual_split_once.rs:49:5
|
||||
|
|
||||
LL | let mut iter = "a.b.c".splitn(2, '.');
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL | let l = iter.next()?;
|
||||
| --------------------- first usage here
|
||||
LL | let r = iter.next()?;
|
||||
| --------------------- second usage here
|
||||
|
|
||||
help: try `split_once`
|
||||
|
|
||||
LL | let (l, r) = "a.b.c".split_once('.')?;
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let l = iter.next()?;
|
||||
LL +
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let r = iter.next()?;
|
||||
LL +
|
||||
|
|
||||
|
||||
error: manual implementation of `rsplit_once`
|
||||
--> $DIR/manual_split_once.rs:53:5
|
||||
|
|
||||
LL | let mut iter = "a.b.c".rsplitn(2, '.');
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL | let r = iter.next().unwrap();
|
||||
| ----------------------------- first usage here
|
||||
LL | let l = iter.next().unwrap();
|
||||
| ----------------------------- second usage here
|
||||
|
|
||||
help: try `rsplit_once`
|
||||
|
|
||||
LL | let (l, r) = "a.b.c".rsplit_once('.').unwrap();
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let r = iter.next().unwrap();
|
||||
LL +
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let l = iter.next().unwrap();
|
||||
LL +
|
||||
|
|
||||
|
||||
error: manual implementation of `rsplit_once`
|
||||
--> $DIR/manual_split_once.rs:57:5
|
||||
|
|
||||
LL | let mut iter = "a.b.c".rsplitn(2, '.');
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL | let r = iter.next()?;
|
||||
| --------------------- first usage here
|
||||
LL | let l = iter.next()?;
|
||||
| --------------------- second usage here
|
||||
|
|
||||
help: try `rsplit_once`
|
||||
|
|
||||
LL | let (l, r) = "a.b.c".rsplit_once('.')?;
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let r = iter.next()?;
|
||||
LL +
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let l = iter.next()?;
|
||||
LL +
|
||||
|
|
||||
|
||||
error: manual implementation of `split_once`
|
||||
--> $DIR/manual_split_once.rs:142:13
|
||||
|
|
||||
LL | let _ = "key=value".splitn(2, '=').nth(1).unwrap();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `"key=value".split_once('=').unwrap().1`
|
||||
|
||||
error: aborting due to 14 previous errors
|
||||
error: manual implementation of `split_once`
|
||||
--> $DIR/manual_split_once.rs:144:5
|
||||
|
|
||||
LL | let mut iter = "a.b.c".splitn(2, '.');
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL | let a = iter.next().unwrap();
|
||||
| ----------------------------- first usage here
|
||||
LL | let b = iter.next().unwrap();
|
||||
| ----------------------------- second usage here
|
||||
|
|
||||
help: try `split_once`
|
||||
|
|
||||
LL | let (a, b) = "a.b.c".split_once('.').unwrap();
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let a = iter.next().unwrap();
|
||||
LL +
|
||||
|
|
||||
help: remove the `iter` usages
|
||||
|
|
||||
LL - let b = iter.next().unwrap();
|
||||
LL +
|
||||
|
|
||||
|
||||
error: aborting due to 19 previous errors
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user