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bpo-38870: Don't start generated output with newlines in ast.unparse (GH-19636)

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Batuhan Taskaya 2020-05-03 20:11:51 +03:00 • committed by GitHub
parent 3dd2157feb
commit 493bf1cc31
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2 changed files with 15 additions and 11 deletions
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14
Lib/ast.py
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@ -669,10 +669,16 @@ class _Unparser(NodeVisitor):
else:
self.interleave(lambda: self.write(", "), traverser, items)
def maybe_newline(self):
"""Adds a newline if it isn't the start of generated source"""
if self._source:
self.write("\n")
def fill(self, text=""):
"""Indent a piece of text and append it, according to the current
indentation level"""
self.write("\n" + " " * self._indent + text)
self.maybe_newline()
self.write(" " * self._indent + text)
def write(self, text):
"""Append a piece of text"""
@ -916,7 +922,7 @@ class _Unparser(NodeVisitor):
self.traverse(node.body)
def visit_ClassDef(self, node):
self.write("\n")
self.maybe_newline()
for deco in node.decorator_list:
self.fill("@")
self.traverse(deco)
@ -946,7 +952,7 @@ class _Unparser(NodeVisitor):
self._function_helper(node, "async def")
def _function_helper(self, node, fill_suffix):
self.write("\n")
self.maybe_newline()
for deco in node.decorator_list:
self.fill("@")
self.traverse(deco)
@ -1043,7 +1049,7 @@ class _Unparser(NodeVisitor):
write("{")
unparser = type(self)()
unparser.set_precedence(_Precedence.TEST.next(), node.value)
expr = unparser.visit(node.value).rstrip("\n")
expr = unparser.visit(node.value)
if expr.startswith("{"):
write(" ") # Separate pair of opening brackets as "{ {"
write(expr)