Replace some usages of the old unescape_ functions in AST, clippy and tests.

Author: Julian-Wollersberger

src/librustc_ast/util/literal.rs

@@ -6,8 +6,7 @@ use crate::tokenstream::TokenTree;
 
 use rustc_data_structures::sync::Lrc;
 use rustc_lexer::unescape::{unescape_byte, unescape_char};
-use rustc_lexer::unescape::{unescape_byte_str, unescape_str};
-use rustc_lexer::unescape::{unescape_raw_byte_str, unescape_raw_str};
+use rustc_lexer::unescape::{unescape_byte_literal, unescape_literal, Mode};
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::Span;
 
@@ -59,45 +58,53 @@ impl LitKind {
                 // new symbol because the string in the LitKind is different to the
                 // string in the token.
                 let s = symbol.as_str();
-                let symbol = if s.contains(&['\\', '\r'][..]) {
-                    let mut buf = String::with_capacity(s.len());
-                    let mut error = Ok(());
-                    unescape_str(&s, &mut |_, unescaped_char| match unescaped_char {
-                        Ok(c) => buf.push(c),
-                        Err(_) => error = Err(LitError::LexerError),
-                    });
-                    error?;
-                    Symbol::intern(&buf)
-                } else {
-                    symbol
-                };
+                let symbol =
+                    if s.contains(&['\\', '\r'][..]) {
+                        let mut buf = String::with_capacity(s.len());
+                        let mut error = Ok(());
+                        unescape_literal(&s, Mode::Str, &mut |_, unescaped_char| {
+                            match unescaped_char {
+                                Ok(c) => buf.push(c),
+                                Err(_) => error = Err(LitError::LexerError),
+                            }
+                        });
+                        error?;
+                        Symbol::intern(&buf)
+                    } else {
+                        symbol
+                    };
                 LitKind::Str(symbol, ast::StrStyle::Cooked)
             }
             token::StrRaw(n) => {
                 // Ditto.
                 let s = symbol.as_str();
-                let symbol = if s.contains('\r') {
-                    let mut buf = String::with_capacity(s.len());
-                    let mut error = Ok(());
-                    unescape_raw_str(&s, &mut |_, unescaped_char| match unescaped_char {
-                        Ok(c) => buf.push(c),
-                        Err(_) => error = Err(LitError::LexerError),
-                    });
-                    error?;
-                    buf.shrink_to_fit();
-                    Symbol::intern(&buf)
-                } else {
-                    symbol
-                };
+                let symbol =
+                    if s.contains('\r') {
+                        let mut buf = String::with_capacity(s.len());
+                        let mut error = Ok(());
+                        unescape_literal(&s, Mode::RawStr, &mut |_, unescaped_char| {
+                            match unescaped_char {
+                                Ok(c) => buf.push(c),
+                                Err(_) => error = Err(LitError::LexerError),
+                            }
+                        });
+                        error?;
+                        buf.shrink_to_fit();
+                        Symbol::intern(&buf)
+                    } else {
+                        symbol
+                    };
                 LitKind::Str(symbol, ast::StrStyle::Raw(n))
             }
             token::ByteStr => {
                 let s = symbol.as_str();
                 let mut buf = Vec::with_capacity(s.len());
                 let mut error = Ok(());
-                unescape_byte_str(&s, &mut |_, unescaped_byte| match unescaped_byte {
-                    Ok(c) => buf.push(c),
-                    Err(_) => error = Err(LitError::LexerError),
+                unescape_byte_literal(&s, Mode::ByteStr, &mut |_, unescaped_byte| {
+                    match unescaped_byte {
+                        Ok(c) => buf.push(c),
+                        Err(_) => error = Err(LitError::LexerError),
+                    }
                 });
                 error?;
                 buf.shrink_to_fit();
@@ -108,9 +115,11 @@ impl LitKind {
                 let bytes = if s.contains('\r') {
                     let mut buf = Vec::with_capacity(s.len());
                     let mut error = Ok(());
-                    unescape_raw_byte_str(&s, &mut |_, unescaped_byte| match unescaped_byte {
-                        Ok(c) => buf.push(c),
-                        Err(_) => error = Err(LitError::LexerError),
+                    unescape_byte_literal(&s, Mode::RawByteStr, &mut |_, unescaped_byte| {
+                        match unescaped_byte {
+                            Ok(c) => buf.push(c),
+                            Err(_) => error = Err(LitError::LexerError),
+                        }
                     });
                     error?;
                     buf.shrink_to_fit();

src/librustc_lexer/src/unescape.rs

@@ -111,54 +111,6 @@ pub fn unescape_byte(literal_text: &str) -> Result<u8, (usize, EscapeError)> {
         .map_err(|err| (literal_text.len() - chars.as_str().len(), err))
 }
 
-/// Takes a contents of a string literal (without quotes) and produces a
-/// sequence of escaped characters or errors.
-/// Values are returned through invoking of the provided callback.
-pub fn unescape_str<F>(literal_text: &str, callback: &mut F)
-where
-    F: FnMut(Range<usize>, Result<char, EscapeError>),
-{
-    unescape_str_or_byte_str(literal_text, Mode::Str, callback)
-}
-
-/// Takes a contents of a byte string literal (without quotes) and produces a
-/// sequence of bytes or errors.
-/// Values are returned through invoking of the provided callback.
-pub fn unescape_byte_str<F>(literal_text: &str, callback: &mut F)
-where
-    F: FnMut(Range<usize>, Result<u8, EscapeError>),
-{
-    unescape_str_or_byte_str(literal_text, Mode::ByteStr, &mut |range, char| {
-        callback(range, char.map(byte_from_char))
-    })
-}
-
-/// Takes a contents of a raw string literal (without quotes) and produces a
-/// sequence of characters or errors.
-/// Values are returned through invoking of the provided callback.
-/// NOTE: Raw strings do not perform any explicit character escaping, here we
-/// only translate CRLF to LF and produce errors on bare CR.
-pub fn unescape_raw_str<F>(literal_text: &str, callback: &mut F)
-where
-    F: FnMut(Range<usize>, Result<char, EscapeError>),
-{
-    unescape_raw_str_or_byte_str(literal_text, Mode::Str, callback)
-}
-
-/// Takes a contents of a raw byte string literal (without quotes) and produces a
-/// sequence of bytes or errors.
-/// Values are returned through invoking of the provided callback.
-/// NOTE: Raw strings do not perform any explicit character escaping, here we
-/// only translate CRLF to LF and produce errors on bare CR.
-pub fn unescape_raw_byte_str<F>(literal_text: &str, callback: &mut F)
-where
-    F: FnMut(Range<usize>, Result<u8, EscapeError>),
-{
-    unescape_raw_str_or_byte_str(literal_text, Mode::ByteStr, &mut |range, char| {
-        callback(range, char.map(byte_from_char))
-    })
-}
-
 /// What kind of literal do we parse.
 #[derive(Debug, Clone, Copy)]
 pub enum Mode {

src/librustc_lexer/src/unescape/tests.rs

@@ -102,7 +102,7 @@ fn test_unescape_char_good() {
 fn test_unescape_str_good() {
     fn check(literal_text: &str, expected: &str) {
         let mut buf = Ok(String::with_capacity(literal_text.len()));
-        unescape_str(literal_text, &mut |range, c| {
+        unescape_literal(literal_text, Mode::Str, &mut |range, c| {
             if let Ok(b) = &mut buf {
                 match c {
                     Ok(c) => b.push(c),
@@ -222,7 +222,7 @@ fn test_unescape_byte_good() {
 fn test_unescape_byte_str_good() {
     fn check(literal_text: &str, expected: &[u8]) {
         let mut buf = Ok(Vec::with_capacity(literal_text.len()));
-        unescape_byte_str(literal_text, &mut |range, c| {
+        unescape_byte_literal(literal_text, Mode::ByteStr, &mut |range, c| {
             if let Ok(b) = &mut buf {
                 match c {
                     Ok(c) => b.push(c),
@@ -246,7 +246,7 @@ fn test_unescape_byte_str_good() {
 fn test_unescape_raw_str() {
     fn check(literal: &str, expected: &[(Range<usize>, Result<char, EscapeError>)]) {
         let mut unescaped = Vec::with_capacity(literal.len());
-        unescape_raw_str(literal, &mut |range, res| unescaped.push((range, res)));
+        unescape_literal(literal, Mode::RawStr, &mut |range, res| unescaped.push((range, res)));
         assert_eq!(unescaped, expected);
     }
 
@@ -258,7 +258,9 @@ fn test_unescape_raw_str() {
 fn test_unescape_raw_byte_str() {
     fn check(literal: &str, expected: &[(Range<usize>, Result<u8, EscapeError>)]) {
         let mut unescaped = Vec::with_capacity(literal.len());
-        unescape_raw_byte_str(literal, &mut |range, res| unescaped.push((range, res)));
+        unescape_byte_literal(literal, Mode::RawByteStr, &mut |range, res| {
+            unescaped.push((range, res))
+        });
         assert_eq!(unescaped, expected);
     }
 

src/tools/clippy/clippy_lints/src/write.rs

@@ -483,8 +483,8 @@ fn check_newlines(fmtstr: &StrLit) -> bool {
     };
 
     match fmtstr.style {
-        StrStyle::Cooked => unescape::unescape_str(contents, &mut cb),
-        StrStyle::Raw(_) => unescape::unescape_raw_str(contents, &mut cb),
+        StrStyle::Cooked => unescape::unescape_literal(contents, unescape::Mode::Str, &mut cb),
+        StrStyle::Raw(_) => unescape::unescape_literal(contents, unescape::Mode::RawStr, &mut cb),
     }
 
     should_lint