Fix type inference for raw (byte) strings

crates/ra_syntax/src/ast/generated.rs

@@ -1422,6 +1422,8 @@ unsafe impl TransparentNewType for LiteralExpr {
 pub enum LiteralExprKind<'a> {
     String(&'a String),
     ByteString(&'a ByteString),
+    RawString(&'a RawString),
+    RawByteString(&'a RawByteString),
     Char(&'a Char),
     Byte(&'a Byte),
     IntNumber(&'a IntNumber),
@@ -1435,6 +1437,8 @@ impl AstNode for LiteralExpr {
         match syntax.kind() {
             | STRING
             | BYTE_STRING
+            | RAW_STRING
+            | RAW_BYTE_STRING
             | CHAR
             | BYTE
             | INT_NUMBER
@@ -1453,6 +1457,8 @@ impl LiteralExpr {
         match self.syntax.kind() {
             STRING => LiteralExprKind::String(String::cast(&self.syntax).unwrap()),
             BYTE_STRING => LiteralExprKind::ByteString(ByteString::cast(&self.syntax).unwrap()),
+            RAW_STRING => LiteralExprKind::RawString(RawString::cast(&self.syntax).unwrap()),
+            RAW_BYTE_STRING => LiteralExprKind::RawByteString(RawByteString::cast(&self.syntax).unwrap()),
             CHAR => LiteralExprKind::Char(Char::cast(&self.syntax).unwrap()),
             BYTE => LiteralExprKind::Byte(Byte::cast(&self.syntax).unwrap()),
             INT_NUMBER => LiteralExprKind::IntNumber(IntNumber::cast(&self.syntax).unwrap()),
@@ -2543,6 +2549,56 @@ impl AstNode for RangePat {
 
 impl RangePat {}
 
+// RawByteString
+#[derive(Debug, PartialEq, Eq, Hash)]
+#[repr(transparent)]
+pub struct RawByteString {
+    pub(crate) syntax: SyntaxNode,
+}
+unsafe impl TransparentNewType for RawByteString {
+    type Repr = rowan::SyntaxNode<RaTypes>;
+}
+
+impl AstNode for RawByteString {
+    fn cast(syntax: &SyntaxNode) -> Option<&Self> {
+        match syntax.kind() {
+            RAW_BYTE_STRING => Some(RawByteString::from_repr(syntax.into_repr())),
+            _ => None,
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+    fn to_owned(&self) -> TreeArc<RawByteString> { TreeArc::cast(self.syntax.to_owned()) }
+}
+
+
+impl ast::AstToken for RawByteString {}
+impl RawByteString {}
+
+// RawString
+#[derive(Debug, PartialEq, Eq, Hash)]
+#[repr(transparent)]
+pub struct RawString {
+    pub(crate) syntax: SyntaxNode,
+}
+unsafe impl TransparentNewType for RawString {
+    type Repr = rowan::SyntaxNode<RaTypes>;
+}
+
+impl AstNode for RawString {
+    fn cast(syntax: &SyntaxNode) -> Option<&Self> {
+        match syntax.kind() {
+            RAW_STRING => Some(RawString::from_repr(syntax.into_repr())),
+            _ => None,
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+    fn to_owned(&self) -> TreeArc<RawString> { TreeArc::cast(self.syntax.to_owned()) }
+}
+
+
+impl ast::AstToken for RawString {}
+impl RawString {}
+
 // RefExpr
 #[derive(Debug, PartialEq, Eq, Hash)]
 #[repr(transparent)]

crates/ra_syntax/src/grammar.ron

@@ -430,7 +430,9 @@ Grammar(
         "IntNumber": ( traits: ["AstToken"] ),
         "FloatNumber": ( traits: ["AstToken"] ),
         "String": ( traits: ["AstToken"] ),
+        "RawString": ( traits: ["AstToken"] ),
         "Byte": ( traits: ["AstToken"] ),
+        "RawByteString": ( traits: ["AstToken"] ),
         "ByteString": ( traits: ["AstToken"] ),
         "Char": ( traits: ["AstToken"] ),
         "TrueKw": ( traits: ["AstToken"] ),
@@ -439,6 +441,8 @@ Grammar(
             enum: [
                 "String",
                 "ByteString",
+                "RawString",
+                "RawByteString",
                 "Char",
                 "Byte",
                 "IntNumber",

crates/ra_syntax/src/lexer/strings.rs

@@ -49,7 +49,7 @@ pub(crate) fn scan_byte_char_or_string(ptr: &mut Ptr) -> SyntaxKind {
             BYTE_STRING
         }
         'r' => {
-            scan_raw_byte_string(ptr);
+            scan_raw_string(ptr);
             RAW_BYTE_STRING
         }
         _ => unreachable!(),
@@ -108,16 +108,3 @@ fn scan_byte(ptr: &mut Ptr) {
 fn scan_byte_string(ptr: &mut Ptr) {
     scan_string(ptr)
 }
-
-fn scan_raw_byte_string(ptr: &mut Ptr) {
-    if !ptr.at('"') {
-        return;
-    }
-    ptr.bump();
-
-    while let Some(c) = ptr.bump() {
-        if c == '"' {
-            return;
-        }
-    }
-}