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[3.12] gh-112364: Correct unparsing of backslashes and quotes in ast.… (#115782)

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[3.12] gh-112364: Correct unparsing of backslashes and quotes in ast.unparse (GH-115696)
(cherry picked from commit 69ab93082d)
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Frank Hoffmann 2024-02-22 00:28:07 +01:00 • committed by GitHub
parent 3651c2729a
commit d2fced7128
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GPG key ID: B5690EEEBB952194
3 changed files with 24 additions and 7 deletions
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15
Lib/ast.py
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@ -1268,14 +1268,18 @@ class _Unparser(NodeVisitor):
quote_type = quote_types[0]
self.write(f"{quote_type}{value}{quote_type}")
def _write_fstring_inner(self, node, scape_newlines=False):
def _write_fstring_inner(self, node, is_format_spec=False):
if isinstance(node, JoinedStr):
# for both the f-string itself, and format_spec
for value in node.values:
self._write_fstring_inner(value, scape_newlines=scape_newlines)
self._write_fstring_inner(value, is_format_spec=is_format_spec)
elif isinstance(node, Constant) and isinstance(node.value, str):
value = node.value.replace("{", "{{").replace("}", "}}")
if scape_newlines:
if is_format_spec:
value = value.replace("\\", "\\\\")
value = value.replace("'", "\\'")
value = value.replace('"', '\\"')
value = value.replace("\n", "\\n")
self.write(value)
elif isinstance(node, FormattedValue):
@ -1299,10 +1303,7 @@ class _Unparser(NodeVisitor):
self.write(f"!{chr(node.conversion)}")
if node.format_spec:
self.write(":")
self._write_fstring_inner(
node.format_spec,
scape_newlines=True
)
self._write_fstring_inner(node.format_spec, is_format_spec=True)
def visit_Name(self, node):
self.write(node.id)