X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/f2ea461e9e9fa5c47bb61fd72d512c748928badc..fd6e92aa460659d26136f5f86878b47254480259:/src/black/lines.py

diff --git a/src/black/lines.py b/src/black/lines.py
index 63225c0..f35665c 100644
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -3,7 +3,6 @@ import itertools
 import sys
 from typing import (
     Callable,
-    Collection,
     Dict,
     Iterator,
     List,
@@ -22,7 +21,7 @@ from black.mode import Mode
 from black.nodes import STANDALONE_COMMENT, TEST_DESCENDANTS
 from black.nodes import BRACKETS, OPENING_BRACKETS, CLOSING_BRACKETS
 from black.nodes import syms, whitespace, replace_child, child_towards
-from black.nodes import is_multiline_string, is_import, is_type_comment, last_two_except
+from black.nodes import is_multiline_string, is_import, is_type_comment
 from black.nodes import is_one_tuple_between
 
 # types
@@ -277,7 +276,9 @@ class Line:
         if self.is_import:
             return True
 
-        if not is_one_tuple_between(closing.opening_bracket, closing, self.leaves):
+        if closing.opening_bracket is not None and not is_one_tuple_between(
+            closing.opening_bracket, closing, self.leaves
+        ):
             return True
 
         return False
@@ -447,11 +448,38 @@ class EmptyLineTracker:
             before = 0
         depth = current_line.depth
         while self.previous_defs and self.previous_defs[-1] >= depth:
-            self.previous_defs.pop()
             if self.is_pyi:
-                before = 0 if depth else 1
+                assert self.previous_line is not None
+                if depth and not current_line.is_def and self.previous_line.is_def:
+                    # Empty lines between attributes and methods should be preserved.
+                    before = min(1, before)
+                elif depth:
+                    before = 0
+                else:
+                    before = 1
             else:
-                before = 1 if depth else 2
+                if depth:
+                    before = 1
+                elif (
+                    not depth
+                    and self.previous_defs[-1]
+                    and current_line.leaves[-1].type == token.COLON
+                    and (
+                        current_line.leaves[0].value
+                        not in ("with", "try", "for", "while", "if", "match")
+                    )
+                ):
+                    # We shouldn't add two newlines between an indented function and
+                    # a dependent non-indented clause. This is to avoid issues with
+                    # conditional function definitions that are technically top-level
+                    # and therefore get two trailing newlines, but look weird and
+                    # inconsistent when they're followed by elif, else, etc. This is
+                    # worse because these functions only get *one* preceding newline
+                    # already.
+                    before = 1
+                else:
+                    before = 2
+            self.previous_defs.pop()
         if current_line.is_decorator or current_line.is_def or current_line.is_class:
             return self._maybe_empty_lines_for_class_or_def(current_line, before)
 
@@ -501,10 +529,12 @@ class EmptyLineTracker:
             return 0, 0
 
         if self.is_pyi:
-            if self.previous_line.depth > current_line.depth:
-                newlines = 1
-            elif current_line.is_class or self.previous_line.is_class:
-                if current_line.is_stub_class and self.previous_line.is_stub_class:
+            if current_line.is_class or self.previous_line.is_class:
+                if self.previous_line.depth < current_line.depth:
+                    newlines = 0
+                elif self.previous_line.depth > current_line.depth:
+                    newlines = 1
+                elif current_line.is_stub_class and self.previous_line.is_stub_class:
                     # No blank line between classes with an empty body
                     newlines = 0
                 else:
@@ -512,15 +542,20 @@ class EmptyLineTracker:
             elif (
                 current_line.is_def or current_line.is_decorator
             ) and not self.previous_line.is_def:
-                # Blank line between a block of functions (maybe with preceding
-                # decorators) and a block of non-functions
+                if current_line.depth:
+                    # In classes empty lines between attributes and methods should
+                    # be preserved.
+                    newlines = min(1, before)
+                else:
+                    # Blank line between a block of functions (maybe with preceding
+                    # decorators) and a block of non-functions
+                    newlines = 1
+            elif self.previous_line.depth > current_line.depth:
                 newlines = 1
             else:
                 newlines = 0
         else:
-            newlines = 2
-        if current_line.depth and newlines:
-            newlines -= 1
+            newlines = 1 if current_line.depth else 2
         return newlines, 0
 
 
@@ -609,7 +644,6 @@ def can_be_split(line: Line) -> bool:
 def can_omit_invisible_parens(
     line: Line,
     line_length: int,
-    omit_on_explode: Collection[LeafID] = (),
 ) -> bool:
     """Does `line` have a shape safe to reformat without optional parens around it?
 
@@ -647,12 +681,6 @@ def can_omit_invisible_parens(
 
     penultimate = line.leaves[-2]
     last = line.leaves[-1]
-    if line.magic_trailing_comma:
-        try:
-            penultimate, last = last_two_except(line.leaves, omit=omit_on_explode)
-        except LookupError:
-            # Turns out we'd omit everything.  We cannot skip the optional parentheses.
-            return False
 
     if (
         last.type == token.RPAR
@@ -674,10 +702,6 @@ def can_omit_invisible_parens(
             # unnecessary.
             return True
 
-        if line.magic_trailing_comma and penultimate.type == token.COMMA:
-            # The rightmost non-omitted bracket pair is the one we want to explode on.
-            return True
-
         if _can_omit_closing_paren(line, last=last, line_length=line_length):
             return True