Fix not applicable c-str and byte-str for raw_string

crates/ide-assists/src/handlers/raw_string.rs

@@ -1,10 +1,12 @@
-use std::borrow::Cow;
-
-use syntax::{AstToken, TextRange, TextSize, ast, ast::IsString};
+use ide_db::source_change::SourceChangeBuilder;
+use syntax::{
+    AstToken,
+    ast::{self, IsString, make::tokens::literal},
+};
 
 use crate::{
     AssistContext, AssistId, Assists,
-    utils::{required_hashes, string_suffix},
+    utils::{required_hashes, string_prefix, string_suffix},
 };
 
 // Assist: make_raw_string
@@ -23,8 +25,7 @@ use crate::{
 // }
 // ```
 pub(crate) fn make_raw_string(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
-    // FIXME: This should support byte and c strings as well.
-    let token = ctx.find_token_at_offset::<ast::String>()?;
+    let token = ctx.find_token_at_offset::<ast::AnyString>()?;
     if token.is_raw() {
         return None;
     }
@@ -36,16 +37,10 @@ pub(crate) fn make_raw_string(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
         target,
         |edit| {
             let hashes = "#".repeat(required_hashes(&value).max(1));
-            let range = token.syntax().text_range();
+            let raw_prefix = token.raw_prefix();
             let suffix = string_suffix(token.text()).unwrap_or_default();
-            let range = TextRange::new(range.start(), range.end() - TextSize::of(suffix));
-            if matches!(value, Cow::Borrowed(_)) {
-                // Avoid replacing the whole string to better position the cursor.
-                edit.insert(range.start(), format!("r{hashes}"));
-                edit.insert(range.end(), hashes);
-            } else {
-                edit.replace(range, format!("r{hashes}\"{value}\"{hashes}"));
-            }
+            let new_str = format!("{raw_prefix}{hashes}\"{value}\"{hashes}{suffix}");
+            replace_literal(&token, &new_str, edit, ctx);
         },
     )
 }
@@ -66,7 +61,7 @@ pub(crate) fn make_raw_string(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
 // }
 // ```
 pub(crate) fn make_usual_string(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
-    let token = ctx.find_token_at_offset::<ast::String>()?;
+    let token = ctx.find_token_at_offset::<ast::AnyString>()?;
     if !token.is_raw() {
         return None;
     }
@@ -80,18 +75,9 @@ pub(crate) fn make_usual_string(acc: &mut Assists, ctx: &AssistContext<'_>) -> O
             // parse inside string to escape `"`
             let escaped = value.escape_default().to_string();
             let suffix = string_suffix(token.text()).unwrap_or_default();
-            if let Some(offsets) = token.quote_offsets()
-                && token.text()[offsets.contents - token.syntax().text_range().start()] == escaped
-            {
-                let end_quote = offsets.quotes.1;
-                let end_quote =
-                    TextRange::new(end_quote.start(), end_quote.end() - TextSize::of(suffix));
-                edit.replace(offsets.quotes.0, "\"");
-                edit.replace(end_quote, "\"");
-                return;
-            }
-
-            edit.replace(token.syntax().text_range(), format!("\"{escaped}\"{suffix}"));
+            let prefix = string_prefix(token.text()).map_or("", |s| s.trim_end_matches('r'));
+            let new_str = format!("{prefix}\"{escaped}\"{suffix}");
+            replace_literal(&token, &new_str, edit, ctx);
         },
     )
 }
@@ -112,16 +98,18 @@ pub(crate) fn make_usual_string(acc: &mut Assists, ctx: &AssistContext<'_>) -> O
 // }
 // ```
 pub(crate) fn add_hash(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
-    let token = ctx.find_token_at_offset::<ast::String>()?;
+    let token = ctx.find_token_at_offset::<ast::AnyString>()?;
     if !token.is_raw() {
         return None;
     }
-    let text_range = token.syntax().text_range();
-    let target = text_range;
+    let target = token.syntax().text_range();
     acc.add(AssistId::refactor("add_hash"), "Add #", target, |edit| {
-        let suffix = string_suffix(token.text()).unwrap_or_default();
-        edit.insert(text_range.start() + TextSize::of('r'), "#");
-        edit.insert(text_range.end() - TextSize::of(suffix), "#");
+        let str = token.text();
+        let suffix = string_suffix(str).unwrap_or_default();
+        let raw_prefix = token.raw_prefix();
+        let wrap_range = raw_prefix.len()..str.len() - suffix.len();
+        let new_str = [raw_prefix, "#", &str[wrap_range], "#", suffix].concat();
+        replace_literal(&token, &new_str, edit, ctx);
     })
 }
 
@@ -141,17 +129,15 @@ pub(crate) fn add_hash(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()>
 // }
 // ```
 pub(crate) fn remove_hash(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
-    let token = ctx.find_token_at_offset::<ast::String>()?;
+    let token = ctx.find_token_at_offset::<ast::AnyString>()?;
     if !token.is_raw() {
         return None;
     }
 
     let text = token.text();
-    if !text.starts_with("r#") && text.ends_with('#') {
-        return None;
-    }
 
-    let existing_hashes = text.chars().skip(1).take_while(|&it| it == '#').count();
+    let existing_hashes =
+        text.chars().skip(token.raw_prefix().len()).take_while(|&it| it == '#').count();
 
     let text_range = token.syntax().text_range();
     let internal_text = &text[token.text_range_between_quotes()? - text_range.start()];
@@ -163,14 +149,38 @@ pub(crate) fn remove_hash(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<
 
     acc.add(AssistId::refactor_rewrite("remove_hash"), "Remove #", text_range, |edit| {
         let suffix = string_suffix(text).unwrap_or_default();
-        edit.delete(TextRange::at(text_range.start() + TextSize::of('r'), TextSize::of('#')));
-        edit.delete(
-            TextRange::new(text_range.end() - TextSize::of('#'), text_range.end())
-                - TextSize::of(suffix),
-        );
+        let prefix = token.raw_prefix();
+        let wrap_range = prefix.len() + 1..text.len() - suffix.len() - 1;
+        let new_str = [prefix, &text[wrap_range], suffix].concat();
+        replace_literal(&token, &new_str, edit, ctx);
     })
 }
 
+fn replace_literal(
+    token: &impl AstToken,
+    new: &str,
+    builder: &mut SourceChangeBuilder,
+    ctx: &AssistContext<'_>,
+) {
+    let token = token.syntax();
+    let node = token.parent().expect("no parent token");
+    let mut edit = builder.make_editor(&node);
+    let new_literal = literal(new);
+
+    edit.replace(token, mut_token(new_literal));
+
+    builder.add_file_edits(ctx.vfs_file_id(), edit);
+}
+
+fn mut_token(token: syntax::SyntaxToken) -> syntax::SyntaxToken {
+    let node = token.parent().expect("no parent token");
+    node.clone_for_update()
+        .children_with_tokens()
+        .filter_map(|it| it.into_token())
+        .find(|it| it.text_range() == token.text_range() && it.text() == token.text())
+        .unwrap()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -224,6 +234,42 @@ string"#;
         )
     }
 
+    #[test]
+    fn make_raw_byte_string_works() {
+        check_assist(
+            make_raw_string,
+            r#"
+fn f() {
+    let s = $0b"random\nstring";
+}
+"#,
+            r##"
+fn f() {
+    let s = br#"random
+string"#;
+}
+"##,
+        )
+    }
+
+    #[test]
+    fn make_raw_c_string_works() {
+        check_assist(
+            make_raw_string,
+            r#"
+fn f() {
+    let s = $0c"random\nstring";
+}
+"#,
+            r##"
+fn f() {
+    let s = cr#"random
+string"#;
+}
+"##,
+        )
+    }
+
     #[test]
     fn make_raw_string_hashes_inside_works() {
         check_assist(
@@ -348,6 +394,23 @@ string"###;
         )
     }
 
+    #[test]
+    fn add_hash_works_for_c_str() {
+        check_assist(
+            add_hash,
+            r#"
+            fn f() {
+                let s = $0cr"random string";
+            }
+            "#,
+            r##"
+            fn f() {
+                let s = cr#"random string"#;
+            }
+            "##,
+        )
+    }
+
     #[test]
     fn add_hash_has_suffix_works() {
         check_assist(
@@ -433,6 +496,15 @@ string"###;
         )
     }
 
+    #[test]
+    fn remove_hash_works_for_c_str() {
+        check_assist(
+            remove_hash,
+            r##"fn f() { let s = $0cr#"random string"#; }"##,
+            r#"fn f() { let s = cr"random string"; }"#,
+        )
+    }
+
     #[test]
     fn remove_hash_has_suffix_works() {
         check_assist(
@@ -529,6 +601,23 @@ string"###;
         )
     }
 
+    #[test]
+    fn make_usual_string_for_c_str() {
+        check_assist(
+            make_usual_string,
+            r##"
+            fn f() {
+                let s = $0cr#"random string"#;
+            }
+            "##,
+            r#"
+            fn f() {
+                let s = c"random string";
+            }
+            "#,
+        )
+    }
+
     #[test]
     fn make_usual_string_has_suffix_works() {
         check_assist(

crates/ide-assists/src/utils.rs

@@ -1057,6 +1057,21 @@ fn test_string_suffix() {
     assert_eq!(Some("i32"), string_suffix(r##"r#""#i32"##));
 }
 
+/// Calculate the string literal prefix length
+pub(crate) fn string_prefix(s: &str) -> Option<&str> {
+    s.split_once(['"', '\'', '#']).map(|(prefix, _)| prefix)
+}
+#[test]
+fn test_string_prefix() {
+    assert_eq!(Some(""), string_prefix(r#""abc""#));
+    assert_eq!(Some(""), string_prefix(r#""""#));
+    assert_eq!(Some(""), string_prefix(r#"""suffix"#));
+    assert_eq!(Some("c"), string_prefix(r#"c"""#));
+    assert_eq!(Some("r"), string_prefix(r#"r"""#));
+    assert_eq!(Some("cr"), string_prefix(r#"cr"""#));
+    assert_eq!(Some("r"), string_prefix(r##"r#""#"##));
+}
+
 /// Replaces the record expression, handling field shorthands including inside macros.
 pub(crate) fn replace_record_field_expr(
     ctx: &AssistContext<'_>,

crates/syntax/src/ast.rs

@@ -29,7 +29,9 @@ pub use self::{
         SlicePatComponents, StructKind, TypeBoundKind, TypeOrConstParam, VisibilityKind,
     },
     operators::{ArithOp, BinaryOp, CmpOp, LogicOp, Ordering, RangeOp, UnaryOp},
-    token_ext::{CommentKind, CommentPlacement, CommentShape, IsString, QuoteOffsets, Radix},
+    token_ext::{
+        AnyString, CommentKind, CommentPlacement, CommentShape, IsString, QuoteOffsets, Radix,
+    },
     traits::{
         AttrDocCommentIter, DocCommentIter, HasArgList, HasAttrs, HasDocComments, HasGenericArgs,
         HasGenericParams, HasLoopBody, HasModuleItem, HasName, HasTypeBounds, HasVisibility,