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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
# pyre-unsafe
from typing import Any, Sequence
from libcst._nodes.module import Module
from libcst._nodes.whitespace import NEWLINE_RE
from libcst._parser.production_decorator import with_production
from libcst._parser.types.config import ParserConfig
@with_production("file_input", "(NEWLINE | stmt)* ENDMARKER")
def convert_file_input(config: ParserConfig, children: Sequence[Any]) -> Any:
*body, footer = children
if len(body) == 0:
# If there's no body, the header and footer are ambiguous. The header is more
# important, and should own the EmptyLine nodes instead of the footer.
header = footer
footer = ()
if (
len(config.lines) == 2
and NEWLINE_RE.fullmatch(config.lines[0])
and config.lines[1] == ""
):
# This is an empty file (not even a comment), so special-case this to an
# empty list instead of a single dummy EmptyLine (which is what we'd
# normally parse).
header = ()
else:
# Steal the leading lines from the first statement, and move them into the
# header.
first_stmt = body[0]
header = first_stmt.leading_lines
body[0] = first_stmt.with_changes(leading_lines=())
return Module(
header=header,
body=body,
footer=footer,
encoding=config.encoding,
default_indent=config.default_indent,
default_newline=config.default_newline,
has_trailing_newline=config.has_trailing_newline,
)
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