Kill RAW_ literals

Syntactically, they are indistinguishable from non-raw versions, so it
doesn't make sense to separate then *at the syntax* level.

crates/syntax/src/ast/expr_ext.rs

@@ -320,6 +320,13 @@ impl ast::Literal {
         ast::IntNumber::cast(self.token())
     }
 
+    pub fn as_string(&self) -> Option<ast::String> {
+        ast::String::cast(self.token())
+    }
+    pub fn as_byte_string(&self) -> Option<ast::ByteString> {
+        ast::ByteString::cast(self.token())
+    }
+
     fn find_suffix(text: &str, possible_suffixes: &[&str]) -> Option<SmolStr> {
         possible_suffixes
             .iter()
@@ -351,10 +358,10 @@ impl ast::Literal {
                     suffix: Self::find_suffix(&text, &ast::FloatNumber::SUFFIXES),
                 }
             }
-            STRING | RAW_STRING => LiteralKind::String,
+            STRING => LiteralKind::String,
             T![true] => LiteralKind::Bool(true),
             T![false] => LiteralKind::Bool(false),
-            BYTE_STRING | RAW_BYTE_STRING => LiteralKind::ByteString,
+            BYTE_STRING => LiteralKind::ByteString,
             CHAR => LiteralKind::Char,
             BYTE => LiteralKind::Byte,
             _ => unreachable!(),

crates/syntax/src/ast/generated/tokens.rs

@@ -70,16 +70,16 @@ impl AstToken for String {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct RawString {
+pub struct ByteString {
     pub(crate) syntax: SyntaxToken,
 }
-impl std::fmt::Display for RawString {
+impl std::fmt::Display for ByteString {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(&self.syntax, f)
     }
 }
-impl AstToken for RawString {
-    fn can_cast(kind: SyntaxKind) -> bool { kind == RAW_STRING }
+impl AstToken for ByteString {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == BYTE_STRING }
     fn cast(syntax: SyntaxToken) -> Option<Self> {
         if Self::can_cast(syntax.kind()) {
             Some(Self { syntax })

crates/syntax/src/ast/node_ext.rs

@@ -55,13 +55,7 @@ impl ast::Attr {
         let key = self.simple_name()?;
         let value_token = lit.syntax().first_token()?;
 
-        let value: SmolStr = if let Some(s) = ast::String::cast(value_token.clone()) {
-            s.value()?.into()
-        } else if let Some(s) = ast::RawString::cast(value_token) {
-            s.value()?.into()
-        } else {
-            return None;
-        };
+        let value: SmolStr = ast::String::cast(value_token.clone())?.value()?.into();
 
         Some((key, value))
     }

crates/syntax/src/ast/token_ext.rs

@@ -139,14 +139,31 @@ pub trait HasQuotes: AstToken {
 }
 
 impl HasQuotes for ast::String {}
-impl HasQuotes for ast::RawString {}
 
 pub trait HasStringValue: HasQuotes {
     fn value(&self) -> Option<Cow<'_, str>>;
 }
 
+impl ast::String {
+    pub fn is_raw(&self) -> bool {
+        self.text().starts_with('r')
+    }
+    pub fn map_range_up(&self, range: TextRange) -> Option<TextRange> {
+        let contents_range = self.text_range_between_quotes()?;
+        assert!(TextRange::up_to(contents_range.len()).contains_range(range));
+        Some(range + contents_range.start())
+    }
+}
+
 impl HasStringValue for ast::String {
     fn value(&self) -> Option<Cow<'_, str>> {
+        if self.is_raw() {
+            let text = self.text().as_str();
+            let text =
+                &text[self.text_range_between_quotes()? - self.syntax().text_range().start()];
+            return Some(Cow::Borrowed(text));
+        }
+
         let text = self.text().as_str();
         let text = &text[self.text_range_between_quotes()? - self.syntax().text_range().start()];
 
@@ -166,20 +183,9 @@ impl HasStringValue for ast::String {
     }
 }
 
-// FIXME: merge `ast::RawString` and `ast::String`.
-impl HasStringValue for ast::RawString {
-    fn value(&self) -> Option<Cow<'_, str>> {
-        let text = self.text().as_str();
-        let text = &text[self.text_range_between_quotes()? - self.syntax().text_range().start()];
-        Some(Cow::Borrowed(text))
-    }
-}
-
-impl ast::RawString {
-    pub fn map_range_up(&self, range: TextRange) -> Option<TextRange> {
-        let contents_range = self.text_range_between_quotes()?;
-        assert!(TextRange::up_to(contents_range.len()).contains_range(range));
-        Some(range + contents_range.start())
+impl ast::ByteString {
+    pub fn is_raw(&self) -> bool {
+        self.text().starts_with("br")
     }
 }
 
@@ -522,22 +528,6 @@ impl HasFormatSpecifier for ast::String {
     }
 }
 
-impl HasFormatSpecifier for ast::RawString {
-    fn char_ranges(
-        &self,
-    ) -> Option<Vec<(TextRange, Result<char, rustc_lexer::unescape::EscapeError>)>> {
-        let text = self.text().as_str();
-        let text = &text[self.text_range_between_quotes()? - self.syntax().text_range().start()];
-        let offset = self.text_range_between_quotes()?.start() - self.syntax().text_range().start();
-
-        let mut res = Vec::with_capacity(text.len());
-        for (idx, c) in text.char_indices() {
-            res.push((TextRange::at(idx.try_into().unwrap(), TextSize::of(c)) + offset, Ok(c)));
-        }
-        Some(res)
-    }
-}
-
 impl ast::IntNumber {
     #[rustfmt::skip]
     pub(crate) const SUFFIXES: &'static [&'static str] = &[