format ExprJoinedStr

wip to check direction

currently generates invalid python because it doesn't know to switch
quote style when the nesting is inside a formatted value like in
`f"MOAR {' '.join([])}"` so it makes the inner quotes double as well

Cargo.toml

@@ -52,11 +52,11 @@ wsl = { version = "0.1.0" }
 # v1.0.1
 libcst = { git = "https://github.com/Instagram/LibCST.git", rev = "3cacca1a1029f05707e50703b49fe3dd860aa839", default-features = false }
 
-ruff_text_size = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "db04fd415774032e1e2ceb03bcbf5305e0d22c8c" }
-rustpython-ast = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "db04fd415774032e1e2ceb03bcbf5305e0d22c8c" , default-features = false, features = ["num-bigint"]}
-rustpython-format = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "db04fd415774032e1e2ceb03bcbf5305e0d22c8c", default-features = false, features = ["num-bigint"] }
-rustpython-literal = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "db04fd415774032e1e2ceb03bcbf5305e0d22c8c", default-features = false }
-rustpython-parser = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "db04fd415774032e1e2ceb03bcbf5305e0d22c8c" , default-features = false, features = ["full-lexer", "num-bigint"] }
+ruff_text_size = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "472f0d480650bb1c3c95596fcb910895b8d25ab5" }
+rustpython-ast = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "472f0d480650bb1c3c95596fcb910895b8d25ab5" , default-features = false, features = ["num-bigint"]}
+rustpython-format = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "472f0d480650bb1c3c95596fcb910895b8d25ab5", default-features = false, features = ["num-bigint"] }
+rustpython-literal = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "472f0d480650bb1c3c95596fcb910895b8d25ab5", default-features = false }
+rustpython-parser = { git = "https://github.com/astral-sh/RustPython-Parser.git", rev = "472f0d480650bb1c3c95596fcb910895b8d25ab5" , default-features = false, features = ["full-lexer", "num-bigint"] }
 
 [profile.release]
 lto = "fat"

crates/ruff_python_formatter/src/expression/expr_formatted_value.rs

@@ -1,6 +1,8 @@
 use crate::context::PyFormatContext;
+use crate::expression::parentheses::Parentheses;
 use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
-use crate::{not_yet_implemented, FormatNodeRule, PyFormatter};
+use crate::prelude::*;
+use crate::{FormatNodeRule, PyFormatter};
 use ruff_formatter::{write, Buffer, FormatResult};
 use ruff_python_ast::node::AnyNodeRef;
 use rustpython_parser::ast::ExprFormattedValue;
@@ -10,7 +12,21 @@ pub struct FormatExprFormattedValue;
 
 impl FormatNodeRule<ExprFormattedValue> for FormatExprFormattedValue {
     fn fmt_fields(&self, item: &ExprFormattedValue, f: &mut PyFormatter) -> FormatResult<()> {
-        write!(f, [not_yet_implemented(item)])
+        let ExprFormattedValue {
+            range: _,
+            value,
+            // TODO
+            conversion: _,
+            format_spec: _,
+        } = item;
+        write!(
+            f,
+            [
+                text("{"),
+                value.format().with_options(Parentheses::Never),
+                text("}")
+            ]
+        )
     }
 }
 

crates/ruff_python_formatter/src/expression/expr_joined_str.rs

@@ -1,21 +1,43 @@
 use crate::context::PyFormatContext;
-use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
-use crate::{not_yet_implemented_custom_text, FormatNodeRule, PyFormatter};
-use ruff_formatter::{write, Buffer, FormatResult};
+use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses, Parentheses};
+use crate::expression::string::{StringPrefix, StringQuotes};
+use crate::expression::Expr;
+use crate::prelude::*;
+use crate::{verbatim_text, FormatNodeRule, PyFormatter};
+use ruff_formatter::{write, Buffer, FormatError, FormatResult};
 use ruff_python_ast::node::AnyNodeRef;
 use rustpython_parser::ast::ExprJoinedStr;
 
 #[derive(Default)]
 pub struct FormatExprJoinedStr;
 
 impl FormatNodeRule<ExprJoinedStr> for FormatExprJoinedStr {
-    fn fmt_fields(&self, _item: &ExprJoinedStr, f: &mut PyFormatter) -> FormatResult<()> {
-        write!(
-            f,
-            [not_yet_implemented_custom_text(
-                r#"f"NOT_YET_IMPLEMENTED_ExprJoinedStr""#
-            )]
-        )
+    fn fmt_fields(&self, item: &ExprJoinedStr, f: &mut PyFormatter) -> FormatResult<()> {
+        let ExprJoinedStr { range, values } = item;
+
+        // TODO: can we re-use instead of copy/paste?
+        let string_content = f.context().locator().slice(*range);
+        let prefix = StringPrefix::parse(string_content);
+        let after_prefix = &string_content[usize::from(prefix.text_len())..];
+
+        let quotes = StringQuotes::parse(after_prefix).ok_or(FormatError::syntax_error(
+            "Didn't find string quotes after prefix",
+        ))?;
+
+        prefix.fmt(f)?;
+        quotes.fmt(f)?;
+        // TODO: join_with empty? or some other join?
+        for value in values {
+            match value {
+                // TODO: can we do better?
+                Expr::Constant(_) => write!(f, [verbatim_text(value)])?,
+                Expr::FormattedValue(_) => {
+                    write!(f, [value.format().with_options(Parentheses::Never)])?;
+                }
+                _ => unreachable!(),
+            };
+        }
+        quotes.fmt(f)
     }
 }