X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/40fae18134916b8499bd992d8bef4ae23bcd2986..5379d4f3f460ec9b7063dd1cc10f437b0edf9ae3:/src/black/comments.py

diff --git a/src/black/comments.py b/src/black/comments.py
index c7513c2..4553264 100644
--- a/src/black/comments.py
+++ b/src/black/comments.py
@@ -1,8 +1,14 @@
+import sys
 from dataclasses import dataclass
 from functools import lru_cache
-import regex as re
+import re
 from typing import Iterator, List, Optional, Union
 
+if sys.version_info >= (3, 8):
+    from typing import Final
+else:
+    from typing_extensions import Final
+
 from blib2to3.pytree import Node, Leaf
 from blib2to3.pgen2 import token
 
@@ -12,11 +18,12 @@ from black.nodes import STANDALONE_COMMENT, WHITESPACE
 # types
 LN = Union[Leaf, Node]
 
+FMT_OFF: Final = {"# fmt: off", "# fmt:off", "# yapf: disable"}
+FMT_SKIP: Final = {"# fmt: skip", "# fmt:skip"}
+FMT_PASS: Final = {*FMT_OFF, *FMT_SKIP}
+FMT_ON: Final = {"# fmt: on", "# fmt:on", "# yapf: enable"}
 
-FMT_OFF = {"# fmt: off", "# fmt:off", "# yapf: disable"}
-FMT_SKIP = {"# fmt: skip", "# fmt:skip"}
-FMT_PASS = {*FMT_OFF, *FMT_SKIP}
-FMT_ON = {"# fmt: on", "# fmt:on", "# yapf: enable"}
+COMMENT_EXCEPTIONS = {True: " !:#'", False: " !:#'%"}
 
 
 @dataclass
@@ -37,7 +44,7 @@ class ProtoComment:
     consumed: int  # how many characters of the original leaf's prefix did we consume
 
 
-def generate_comments(leaf: LN) -> Iterator[Leaf]:
+def generate_comments(leaf: LN, *, preview: bool) -> Iterator[Leaf]:
     """Clean the prefix of the `leaf` and generate comments from it, if any.
 
     Comments in lib2to3 are shoved into the whitespace prefix.  This happens
@@ -56,12 +63,16 @@ def generate_comments(leaf: LN) -> Iterator[Leaf]:
     Inline comments are emitted as regular token.COMMENT leaves.  Standalone
     are emitted with a fake STANDALONE_COMMENT token identifier.
     """
-    for pc in list_comments(leaf.prefix, is_endmarker=leaf.type == token.ENDMARKER):
+    for pc in list_comments(
+        leaf.prefix, is_endmarker=leaf.type == token.ENDMARKER, preview=preview
+    ):
         yield Leaf(pc.type, pc.value, prefix="\n" * pc.newlines)
 
 
 @lru_cache(maxsize=4096)
-def list_comments(prefix: str, *, is_endmarker: bool) -> List[ProtoComment]:
+def list_comments(
+    prefix: str, *, is_endmarker: bool, preview: bool
+) -> List[ProtoComment]:
     """Return a list of :class:`ProtoComment` objects parsed from the given `prefix`."""
     result: List[ProtoComment] = []
     if not prefix or "#" not in prefix:
@@ -87,7 +98,7 @@ def list_comments(prefix: str, *, is_endmarker: bool) -> List[ProtoComment]:
             comment_type = token.COMMENT  # simple trailing comment
         else:
             comment_type = STANDALONE_COMMENT
-        comment = make_comment(line)
+        comment = make_comment(line, preview=preview)
         result.append(
             ProtoComment(
                 type=comment_type, value=comment, newlines=nlines, consumed=consumed
@@ -97,10 +108,10 @@ def list_comments(prefix: str, *, is_endmarker: bool) -> List[ProtoComment]:
     return result
 
 
-def make_comment(content: str) -> str:
+def make_comment(content: str, *, preview: bool) -> str:
     """Return a consistently formatted comment from the given `content` string.
 
-    All comments (except for "##", "#!", "#:", '#'", "#%%") should have a single
+    All comments (except for "##", "#!", "#:", '#'") should have a single
     space between the hash sign and the content.
 
     If `content` didn't start with a hash sign, one is provided.
@@ -118,26 +129,26 @@ def make_comment(content: str) -> str:
         and not content.lstrip().startswith("type:")
     ):
         content = " " + content[1:]  # Replace NBSP by a simple space
-    if content and content[0] not in " !:#'%":
+    if content and content[0] not in COMMENT_EXCEPTIONS[preview]:
         content = " " + content
     return "#" + content
 
 
-def normalize_fmt_off(node: Node) -> None:
+def normalize_fmt_off(node: Node, *, preview: bool) -> None:
     """Convert content between `# fmt: off`/`# fmt: on` into standalone comments."""
     try_again = True
     while try_again:
-        try_again = convert_one_fmt_off_pair(node)
+        try_again = convert_one_fmt_off_pair(node, preview=preview)
 
 
-def convert_one_fmt_off_pair(node: Node) -> bool:
+def convert_one_fmt_off_pair(node: Node, *, preview: bool) -> bool:
     """Convert content of a single `# fmt: off`/`# fmt: on` into a standalone comment.
 
     Returns True if a pair was converted.
     """
     for leaf in node.leaves():
         previous_consumed = 0
-        for comment in list_comments(leaf.prefix, is_endmarker=False):
+        for comment in list_comments(leaf.prefix, is_endmarker=False, preview=preview):
             if comment.value not in FMT_PASS:
                 previous_consumed = comment.consumed
                 continue
@@ -152,7 +163,7 @@ def convert_one_fmt_off_pair(node: Node) -> bool:
                     if comment.value in FMT_SKIP and prev.type in WHITESPACE:
                         continue
 
-            ignored_nodes = list(generate_ignored_nodes(leaf, comment))
+            ignored_nodes = list(generate_ignored_nodes(leaf, comment, preview=preview))
             if not ignored_nodes:
                 continue
 
@@ -192,7 +203,9 @@ def convert_one_fmt_off_pair(node: Node) -> bool:
     return False
 
 
-def generate_ignored_nodes(leaf: Leaf, comment: ProtoComment) -> Iterator[LN]:
+def generate_ignored_nodes(
+    leaf: Leaf, comment: ProtoComment, *, preview: bool
+) -> Iterator[LN]:
     """Starting from the container of `leaf`, generate all leaves until `# fmt: on`.
 
     If comment is skip, returns leaf only.
@@ -216,13 +229,13 @@ def generate_ignored_nodes(leaf: Leaf, comment: ProtoComment) -> Iterator[LN]:
             yield leaf.parent
         return
     while container is not None and container.type != token.ENDMARKER:
-        if is_fmt_on(container):
+        if is_fmt_on(container, preview=preview):
             return
 
         # fix for fmt: on in children
-        if contains_fmt_on_at_column(container, leaf.column):
+        if contains_fmt_on_at_column(container, leaf.column, preview=preview):
             for child in container.children:
-                if contains_fmt_on_at_column(child, leaf.column):
+                if contains_fmt_on_at_column(child, leaf.column, preview=preview):
                     return
                 yield child
         else:
@@ -230,12 +243,12 @@ def generate_ignored_nodes(leaf: Leaf, comment: ProtoComment) -> Iterator[LN]:
             container = container.next_sibling
 
 
-def is_fmt_on(container: LN) -> bool:
+def is_fmt_on(container: LN, preview: bool) -> bool:
     """Determine whether formatting is switched on within a container.
     Determined by whether the last `# fmt:` comment is `on` or `off`.
     """
     fmt_on = False
-    for comment in list_comments(container.prefix, is_endmarker=False):
+    for comment in list_comments(container.prefix, is_endmarker=False, preview=preview):
         if comment.value in FMT_ON:
             fmt_on = True
         elif comment.value in FMT_OFF:
@@ -243,7 +256,7 @@ def is_fmt_on(container: LN) -> bool:
     return fmt_on
 
 
-def contains_fmt_on_at_column(container: LN, column: int) -> bool:
+def contains_fmt_on_at_column(container: LN, column: int, *, preview: bool) -> bool:
     """Determine if children at a given column have formatting switched on."""
     for child in container.children:
         if (
@@ -252,7 +265,7 @@ def contains_fmt_on_at_column(container: LN, column: int) -> bool:
             or isinstance(child, Leaf)
             and child.column == column
         ):
-            if is_fmt_on(child):
+            if is_fmt_on(child, preview=preview):
                 return True
 
     return False