Format StmtExpr (#4788)

crates/ruff_python_formatter/src/expression/mod.rs

@@ -1,3 +1,7 @@
+use crate::prelude::*;
+use ruff_formatter::{FormatOwnedWithRule, FormatRefWithRule, FormatRule};
+use rustpython_parser::ast::Expr;
+
 pub(crate) mod expr_attribute;
 pub(crate) mod expr_await;
 pub(crate) mod expr_bin_op;
@@ -25,3 +29,54 @@ pub(crate) mod expr_tuple;
 pub(crate) mod expr_unary_op;
 pub(crate) mod expr_yield;
 pub(crate) mod expr_yield_from;
+
+#[derive(Default)]
+pub struct FormatExpr;
+
+impl FormatRule<Expr, PyFormatContext<'_>> for FormatExpr {
+    fn fmt(&self, item: &Expr, f: &mut PyFormatter) -> FormatResult<()> {
+        match item {
+            Expr::BoolOp(expr) => expr.format().fmt(f),
+            Expr::NamedExpr(expr) => expr.format().fmt(f),
+            Expr::BinOp(expr) => expr.format().fmt(f),
+            Expr::UnaryOp(expr) => expr.format().fmt(f),
+            Expr::Lambda(expr) => expr.format().fmt(f),
+            Expr::IfExp(expr) => expr.format().fmt(f),
+            Expr::Dict(expr) => expr.format().fmt(f),
+            Expr::Set(expr) => expr.format().fmt(f),
+            Expr::ListComp(expr) => expr.format().fmt(f),
+            Expr::SetComp(expr) => expr.format().fmt(f),
+            Expr::DictComp(expr) => expr.format().fmt(f),
+            Expr::GeneratorExp(expr) => expr.format().fmt(f),
+            Expr::Await(expr) => expr.format().fmt(f),
+            Expr::Yield(expr) => expr.format().fmt(f),
+            Expr::YieldFrom(expr) => expr.format().fmt(f),
+            Expr::Compare(expr) => expr.format().fmt(f),
+            Expr::Call(expr) => expr.format().fmt(f),
+            Expr::FormattedValue(expr) => expr.format().fmt(f),
+            Expr::JoinedStr(expr) => expr.format().fmt(f),
+            Expr::Constant(expr) => expr.format().fmt(f),
+            Expr::Attribute(expr) => expr.format().fmt(f),
+            Expr::Subscript(expr) => expr.format().fmt(f),
+            Expr::Starred(expr) => expr.format().fmt(f),
+            Expr::Name(expr) => expr.format().fmt(f),
+            Expr::List(expr) => expr.format().fmt(f),
+            Expr::Tuple(expr) => expr.format().fmt(f),
+            Expr::Slice(expr) => expr.format().fmt(f),
+        }
+    }
+}
+
+impl<'ast> AsFormat<PyFormatContext<'ast>> for Expr {
+    type Format<'a> = FormatRefWithRule<'a, Expr, FormatExpr, PyFormatContext<'ast>>;
+    fn format(&self) -> Self::Format<'_> {
+        FormatRefWithRule::new(self, FormatExpr::default())
+    }
+}
+
+impl<'ast> IntoFormat<PyFormatContext<'ast>> for Expr {
+    type Format = FormatOwnedWithRule<Expr, FormatExpr, PyFormatContext<'ast>>;
+    fn into_format(self) -> Self::Format {
+        FormatOwnedWithRule::new(self, FormatExpr::default())
+    }
+}

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__comments_py.snap

@@ -109,7 +109,7 @@ async def wat():
 ```diff
 --- Black
 +++ Ruff
-@@ -8,27 +8,19 @@
+@@ -8,27 +8,17 @@
  
  Possibly also many, many lines.
  """
@@ -128,16 +128,18 @@ async def wat():
 -
 -# Some comment before a function.
  y = 1
- (
-     # some strings
-     y  # type: ignore
- )
+-(
+-    # some strings
+-    y  # type: ignore
+-)
 -
 -
++# some strings
++y  # type: ignore
  def function(default=None):
      """Docstring comes first.
  
-@@ -45,12 +37,8 @@
+@@ -45,12 +35,8 @@
  
      # This return is also commented for some reason.
      return default
@@ -150,7 +152,7 @@ async def wat():
  # Another comment!
  # This time two lines.
  
-@@ -73,8 +61,6 @@
+@@ -73,8 +59,6 @@
  
          self.spam = 4
          """Docstring for instance attribute spam."""
@@ -159,7 +161,7 @@ async def wat():
  #' <h1>This is pweave!</h1>
  
  
-@@ -93,4 +79,4 @@
+@@ -93,4 +77,4 @@
  
  # Some closing comments.
  # Maybe Vim or Emacs directives for formatting.
@@ -190,10 +192,8 @@ try:
 except ImportError:
     import slow as fast
 y = 1
-(
-    # some strings
-    y  # type: ignore
-)
+# some strings
+y  # type: ignore
 def function(default=None):
     """Docstring comes first.
 

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__black_test__expression_py.snap

@@ -319,7 +319,7 @@ last_call()
 -)
 -{"2.7": dead, "3.7": (long_live or die_hard)}
 -{"2.7": dead, "3.7": (long_live or die_hard), **{"3.6": verygood}}
-+((super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None))
++(super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None)
 +{'2.7': dead, '3.7': (long_live or die_hard)}
 +{'2.7': dead, '3.7': (long_live or die_hard), **{'3.6': verygood}}
  {**a, **b, **c}
@@ -450,8 +450,9 @@ last_call()
 +{'2.7': dead, '3.7': long_live or die_hard}
 +{'2.7', '3.6', '3.7', '3.8', '3.9', '4.0' if gilectomy else '3.10'}
  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or A, 11 or B, 12 or C]
- (SomeName)
+-(SomeName)
  SomeName
++SomeName
  (Good, Bad, Ugly)
  (i for i in (1, 2, 3))
 -((i**2) for i in (1, 2, 3))
@@ -735,7 +736,7 @@ str or None if True else str or bytes or None
 (str or None) if True else (str or bytes or None)
 str or None if (1 if True else 2) else str or bytes or None
 (str or None) if (1 if True else 2) else (str or bytes or None)
-((super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None))
+(super_long_variable_name or None) if (1 if super_long_test_name else 2) else (str or bytes or None)
 {'2.7': dead, '3.7': (long_live or die_hard)}
 {'2.7': dead, '3.7': (long_live or die_hard), **{'3.6': verygood}}
 {**a, **b, **c}
@@ -832,7 +833,7 @@ numpy[np.newaxis, :]
 {'2.7': dead, '3.7': long_live or die_hard}
 {'2.7', '3.6', '3.7', '3.8', '3.9', '4.0' if gilectomy else '3.10'}
 [1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or A, 11 or B, 12 or C]
-(SomeName)
+SomeName
 SomeName
 (Good, Bad, Ugly)
 (i for i in (1, 2, 3))

crates/ruff_python_formatter/src/statement/stmt_expr.rs

@@ -1,5 +1,5 @@
-use crate::{verbatim_text, FormatNodeRule, PyFormatter};
-use ruff_formatter::{write, Buffer, FormatResult};
+use crate::prelude::*;
+use crate::FormatNodeRule;
 use rustpython_parser::ast::StmtExpr;
 
 #[derive(Default)]
@@ -7,6 +7,8 @@ pub struct FormatStmtExpr;
 
 impl FormatNodeRule<StmtExpr> for FormatStmtExpr {
     fn fmt_fields(&self, item: &StmtExpr, f: &mut PyFormatter) -> FormatResult<()> {
-        write!(f, [verbatim_text(item.range)])
+        let StmtExpr { value, .. } = item;
+
+        value.format().fmt(f)
     }
 }