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[3.12] gh-110259: Fix f-strings with multiline expressions and format specs (GH-110271) (#110396)

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gh-110259: Fix f-strings with multiline expressions and format specs (GH-110271)
(cherry picked from commit cc389ef627)

Signed-off-by: Pablo Galindo <pablogsal@gmail.com>
Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
This commit is contained in:
Miss Islington (bot) 2023-10-05 07:07:25 -07:00 • committed by GitHub
parent 7bfcfcf656
commit 09ec8153c6
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5 changed files with 128 additions and 10 deletions
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11
Lib/ast.py
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@ -1268,13 +1268,15 @@ class _Unparser(NodeVisitor):
quote_type = quote_types[0]
self.write(f"{quote_type}{value}{quote_type}")
def _write_fstring_inner(self, node):
def _write_fstring_inner(self, node, scape_newlines=False):
if isinstance(node, JoinedStr):
# for both the f-string itself, and format_spec
for value in node.values:
self._write_fstring_inner(value)
self._write_fstring_inner(value, scape_newlines=scape_newlines)
elif isinstance(node, Constant) and isinstance(node.value, str):
value = node.value.replace("{", "{{").replace("}", "}}")
if scape_newlines:
value = value.replace("\n", "\\n")
self.write(value)
elif isinstance(node, FormattedValue):
self.visit_FormattedValue(node)
@ -1297,7 +1299,10 @@ class _Unparser(NodeVisitor):
self.write(f"!{chr(node.conversion)}")
if node.format_spec:
self.write(":")
self._write_fstring_inner(node.format_spec)
self._write_fstring_inner(
node.format_spec,
scape_newlines=True
)
def visit_Name(self, node):
self.write(node.id)