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add needless_raw_string_hashes lint
add semicolon in doctest
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‎CHANGELOG.md‎

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@@ -5048,6 +5048,7 @@ Released 2018-09-13
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[`needless_pass_by_value`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_value
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[`needless_question_mark`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_question_mark
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[`needless_range_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
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[`needless_raw_string_hashes`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_raw_string_hashes
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[`needless_return`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
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[`needless_splitn`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_splitn
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[`needless_update`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_update

‎clippy_lints/src/declared_lints.rs‎

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@@ -469,6 +469,7 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
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crate::needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS_INFO,
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crate::needless_pass_by_value::NEEDLESS_PASS_BY_VALUE_INFO,
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crate::needless_question_mark::NEEDLESS_QUESTION_MARK_INFO,
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crate::needless_raw_string_hashes::NEEDLESS_RAW_STRING_HASHES_INFO,
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crate::needless_update::NEEDLESS_UPDATE_INFO,
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crate::neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD_INFO,
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crate::neg_multiply::NEG_MULTIPLY_INFO,

‎clippy_lints/src/lib.rs‎

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@@ -230,6 +230,7 @@ mod needless_late_init;
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mod needless_parens_on_range_literals;
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mod needless_pass_by_value;
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mod needless_question_mark;
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mod needless_raw_string_hashes;
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mod needless_update;
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mod neg_cmp_op_on_partial_ord;
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mod neg_multiply;

‎clippy_lints/src/needless_raw_string_hashes.rs‎

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use clippy_utils::diagnostics::span_lint_and_sugg;
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use rustc_ast::{
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ast::{Expr, ExprKind},
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token::LitKind,
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};
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use rustc_errors::Applicability;
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use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
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use rustc_middle::lint::in_external_macro;
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use rustc_session::{declare_lint_pass, declare_tool_lint};
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declare_clippy_lint! {
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/// ### What it does
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/// Checks for raw string literals with an unnecessary amount of hashes around them.
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///
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/// ### Why is this bad?
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/// It's just unnecessary, and makes it look like there's more escaping needed than is actually
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/// necessary.
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///
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/// ### Example
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/// ```rust
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/// let r = r###"Hello, "world"!"###;
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/// ```
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/// Use instead:
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/// ```rust
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/// let r = r#"Hello, "world"!"#;
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/// ```
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#[clippy::version = "1.72.0"]
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pub NEEDLESS_RAW_STRING_HASHES,
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complexity,
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"suggests reducing the number of hashes around a raw string literal"
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}
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declare_lint_pass!(NeedlessRawStringHashes => [NEEDLESS_RAW_STRING_HASHES]);
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impl EarlyLintPass for NeedlessRawStringHashes {
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fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
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if_chain! {
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if !in_external_macro(cx.sess(), expr.span);
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if let ExprKind::Lit(lit) = expr.kind;
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if let LitKind::StrRaw(num) | LitKind::ByteStrRaw(num) | LitKind::CStrRaw(num) = lit.kind;
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then {
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let str = lit.symbol.as_str();
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let mut lowest = 0;
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for i in (0..num).rev() {
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if str.contains(&format!("\"{}", "#".repeat(i as usize))) {
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lowest = i + 1;
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break;
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}
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}
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if lowest < num {
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let hashes = "#".repeat(lowest as usize);
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let prefix = match lit.kind {
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LitKind::StrRaw(..) => "r",
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LitKind::ByteStrRaw(..) => "br",
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LitKind::CStrRaw(..) => "cr",
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_ => unreachable!(),
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};
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span_lint_and_sugg(
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cx,
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NEEDLESS_RAW_STRING_HASHES,
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expr.span,
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"unnecessary hashes around raw string literal",
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"try",
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format!(r#"{prefix}{hashes}"{}"{hashes}"#, lit.symbol),
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Applicability::MachineApplicable,
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);
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}
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}
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}
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}
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}

‎src/main.rs‎

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@@ -6,7 +6,7 @@ use std::env;
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use std::path::PathBuf;
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use std::process::{self, Command};
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const CARGO_CLIPPY_HELP: &str = r#"Checks a package to catch common mistakes and improve your Rust code.
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const CARGO_CLIPPY_HELP: &str = r"Checks a package to catch common mistakes and improve your Rust code.
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Usage:
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cargo clippy [options] [--] [<opts>...]
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You can use tool lints to allow or deny lints from your code, e.g.:
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#[allow(clippy::needless_lifetimes)]
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"#;
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";
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fn show_help() {
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println!("{CARGO_CLIPPY_HELP}");

‎tests/ui/format.fixed‎

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@@ -7,6 +7,7 @@
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clippy::to_string_in_format_args,
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clippy::needless_borrow,
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clippy::uninlined_format_args,
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clippy::needless_raw_string_hashes,
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clippy::useless_vec
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)]
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‎tests/ui/format.rs‎

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clippy::to_string_in_format_args,
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clippy::needless_borrow,
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clippy::uninlined_format_args,
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clippy::needless_raw_string_hashes,
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clippy::useless_vec
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)]
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‎tests/ui/needless_raw_string_hashes.fixed‎

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//@run-rustfix
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#![allow(clippy::no_effect, unused)]
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#![warn(clippy::needless_raw_string_hashes)]
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#![feature(c_str_literals)]
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fn main() {
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r"aaa";
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r#"Hello "world"!"#;
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r####" "### "## "# "####;
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r###" "aa" "# "## "###;
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br"aaa";
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br#"Hello "world"!"#;
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br####" "### "## "# "####;
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br###" "aa" "# "## "###;
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cr"aaa";
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cr#"Hello "world"!"#;
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cr####" "### "## "# "####;
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cr###" "aa" "# "## "###;
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}

‎tests/ui/needless_raw_string_hashes.rs‎

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//@run-rustfix
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#![allow(clippy::no_effect, unused)]
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#![warn(clippy::needless_raw_string_hashes)]
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#![feature(c_str_literals)]
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fn main() {
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r#"aaa"#;
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r##"Hello "world"!"##;
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r######" "### "## "# "######;
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r######" "aa" "# "## "######;
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br#"aaa"#;
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br##"Hello "world"!"##;
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br######" "### "## "# "######;
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br######" "aa" "# "## "######;
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cr#"aaa"#;
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cr##"Hello "world"!"##;
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cr######" "### "## "# "######;
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cr######" "aa" "# "## "######;
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}

‎tests/ui/needless_raw_string_hashes.stderr‎

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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:7:5
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|
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LL | r#"aaa"#;
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| ^^^^^^^^ help: try: `r"aaa"`
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|
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= note: `-D clippy::needless-raw-string-hashes` implied by `-D warnings`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:8:5
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|
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LL | r##"Hello "world"!"##;
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| ^^^^^^^^^^^^^^^^^^^^^ help: try: `r#"Hello "world"!"#`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:9:5
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|
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LL | r######" "### "## "# "######;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `r####" "### "## "# "####`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:10:5
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|
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LL | r######" "aa" "# "## "######;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `r###" "aa" "# "## "###`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:11:5
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|
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LL | br#"aaa"#;
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| ^^^^^^^^^ help: try: `br"aaa"`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:12:5
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|
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LL | br##"Hello "world"!"##;
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| ^^^^^^^^^^^^^^^^^^^^^^ help: try: `br#"Hello "world"!"#`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:13:5
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|
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LL | br######" "### "## "# "######;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `br####" "### "## "# "####`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:14:5
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|
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LL | br######" "aa" "# "## "######;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `br###" "aa" "# "## "###`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:15:5
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|
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LL | cr#"aaa"#;
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| ^^^^^^^^^ help: try: `cr"aaa"`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:16:5
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|
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LL | cr##"Hello "world"!"##;
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| ^^^^^^^^^^^^^^^^^^^^^^ help: try: `cr#"Hello "world"!"#`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:17:5
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|
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LL | cr######" "### "## "# "######;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cr####" "### "## "# "####`
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error: unnecessary hashes around raw string literal
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--> $DIR/needless_raw_string_hashes.rs:18:5
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|
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LL | cr######" "aa" "# "## "######;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cr###" "aa" "# "## "###`
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error: aborting due to 12 previous errors
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