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core.py
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core.py
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import textwrap
from io import StringIO
from itertools import chain
from typing import List, TextIO, Union
import isort.literal
from isort.settings import DEFAULT_CONFIG, Config
from . import output, parse
from .exceptions import ExistingSyntaxErrors, FileSkipComment
from .format import format_natural, remove_whitespace
from .settings import FILE_SKIP_COMMENTS
CIMPORT_IDENTIFIERS = ("cimport ", "cimport*", "from.cimport")
IMPORT_START_IDENTIFIERS = ("from ", "from.import", "import ", "import*") + CIMPORT_IDENTIFIERS
DOCSTRING_INDICATORS = ('"""', "'''")
COMMENT_INDICATORS = DOCSTRING_INDICATORS + ("'", '"', "#")
CODE_SORT_COMMENTS = (
"# isort: list",
"# isort: dict",
"# isort: set",
"# isort: unique-list",
"# isort: tuple",
"# isort: unique-tuple",
"# isort: assignments",
)
LITERAL_TYPE_MAPPING = {
"(": "tuple",
"[": "list",
"{": "dict",
}
def process(
input_stream: TextIO,
output_stream: TextIO,
extension: str = "py",
raise_on_skip: bool = True,
config: Config = DEFAULT_CONFIG,
) -> bool:
"""Parses stream identifying sections of contiguous imports and sorting them
Code with unsorted imports is read from the provided `input_stream`, sorted and then
outputted to the specified `output_stream`.
- `input_stream`: Text stream with unsorted import sections.
- `output_stream`: Text stream to output sorted inputs into.
- `config`: Config settings to use when sorting imports. Defaults settings.
- *Default*: `isort.settings.DEFAULT_CONFIG`.
- `extension`: The file extension or file extension rules that should be used.
- *Default*: `"py"`.
- *Choices*: `["py", "pyi", "pyx"]`.
Returns `True` if there were changes that needed to be made (errors present) from what
was provided in the input_stream, otherwise `False`.
"""
line_separator: str = config.line_ending
add_imports: List[str] = [format_natural(addition) for addition in config.add_imports]
import_section: str = ""
next_import_section: str = ""
next_cimports: bool = False
in_quote: str = ""
was_in_quote: bool = False
first_comment_index_start: int = -1
first_comment_index_end: int = -1
contains_imports: bool = False
in_top_comment: bool = False
first_import_section: bool = True
indent: str = ""
isort_off: bool = False
skip_file: bool = False
code_sorting: Union[bool, str] = False
code_sorting_section: str = ""
code_sorting_indent: str = ""
cimports: bool = False
made_changes: bool = False
stripped_line: str = ""
end_of_file: bool = False
verbose_output: List[str] = []
lines_before: List[str] = []
is_reexport: bool = False
sort_section_size: int = 0
if config.float_to_top:
new_input = ""
current = ""
isort_off = False
for line in chain(input_stream, (None,)):
if isort_off and line is not None:
if line == "# isort: on\n":
isort_off = False
new_input += line
elif line in ("# isort: split\n", "# isort: off\n", None) or str(line).endswith(
"# isort: split\n"
):
if line == "# isort: off\n":
isort_off = True
if current:
if add_imports:
add_line_separator = line_separator or "\n"
current += add_line_separator + add_line_separator.join(add_imports)
add_imports = []
parsed = parse.file_contents(current, config=config)
verbose_output += parsed.verbose_output
extra_space = ""
while current and current[-1] == "\n":
extra_space += "\n"
current = current[:-1]
extra_space = extra_space.replace("\n", "", 1)
sorted_output = output.sorted_imports(
parsed, config, extension, import_type="import"
)
made_changes = made_changes or _has_changed(
before=current,
after=sorted_output,
line_separator=parsed.line_separator,
ignore_whitespace=config.ignore_whitespace,
)
new_input += sorted_output
new_input += extra_space
current = ""
new_input += line or ""
else:
current += line or ""
input_stream = StringIO(new_input)
for index, line in enumerate(chain(input_stream, (None,))):
if line is None:
if index == 0 and not config.force_adds:
return False
not_imports = True
end_of_file = True
line = ""
if not line_separator:
line_separator = "\n"
if code_sorting and code_sorting_section:
if is_reexport:
output_stream.seek(sort_section_size, 0)
sorted_code = textwrap.indent(
isort.literal.assignment(
code_sorting_section,
str(code_sorting),
extension,
config=_indented_config(config, indent),
),
code_sorting_indent,
)
made_changes = made_changes or _has_changed(
before=code_sorting_section,
after=sorted_code,
line_separator=line_separator,
ignore_whitespace=config.ignore_whitespace,
)
sort_section_size += output_stream.write(sorted_code)
else:
stripped_line = line.strip()
if stripped_line and not line_separator:
line_separator = line[len(line.rstrip()) :].replace(" ", "").replace("\t", "")
for file_skip_comment in FILE_SKIP_COMMENTS:
if file_skip_comment in line:
if raise_on_skip:
raise FileSkipComment("Passed in content")
isort_off = True
skip_file = True
if not in_quote:
if stripped_line == "# isort: off":
isort_off = True
elif stripped_line.startswith("# isort: dont-add-imports"):
add_imports = []
elif stripped_line.startswith("# isort: dont-add-import:"):
import_not_to_add = stripped_line.split("# isort: dont-add-import:", 1)[
1
].strip()
add_imports = [
import_to_add
for import_to_add in add_imports
if not import_to_add == import_not_to_add
]
if (
(index == 0 or (index in (1, 2) and not contains_imports))
and stripped_line.startswith("#")
and stripped_line not in config.section_comments
and stripped_line not in CODE_SORT_COMMENTS
):
in_top_comment = True
elif in_top_comment and (
not line.startswith("#")
or stripped_line in config.section_comments
or stripped_line in CODE_SORT_COMMENTS
):
in_top_comment = False
first_comment_index_end = index - 1
was_in_quote = bool(in_quote)
if (not stripped_line.startswith("#") or in_quote) and '"' in line or "'" in line:
char_index = 0
if first_comment_index_start == -1 and (
line.startswith('"') or line.startswith("'")
):
first_comment_index_start = index
while char_index < len(line):
if line[char_index] == "\\":
char_index += 1
elif in_quote:
if line[char_index : char_index + len(in_quote)] == in_quote:
in_quote = ""
if first_comment_index_end < first_comment_index_start:
first_comment_index_end = index
elif line[char_index] in ("'", '"'):
long_quote = line[char_index : char_index + 3]
if long_quote in ('"""', "'''"):
in_quote = long_quote
char_index += 2
else:
in_quote = line[char_index]
elif line[char_index] == "#":
break
char_index += 1
not_imports = bool(in_quote) or was_in_quote or in_top_comment or isort_off
if not (in_quote or was_in_quote or in_top_comment):
if isort_off:
if not skip_file and stripped_line == "# isort: on":
isort_off = False
elif stripped_line.endswith("# isort: split"):
not_imports = True
elif stripped_line in CODE_SORT_COMMENTS:
code_sorting = stripped_line.split("isort: ")[1].strip()
code_sorting_indent = line[: -len(line.lstrip())]
not_imports = True
elif config.sort_reexports and stripped_line.startswith("__all__"):
_, rhs = stripped_line.split("=")
code_sorting = LITERAL_TYPE_MAPPING.get(rhs.rstrip()[0], "tuple")
code_sorting_indent = line[: -len(line.lstrip())]
not_imports = True
code_sorting_section += line
is_reexport = True
sort_section_size -= len(line)
elif code_sorting:
if not stripped_line:
sorted_code = textwrap.indent(
isort.literal.assignment(
code_sorting_section,
str(code_sorting),
extension,
config=_indented_config(config, indent),
),
code_sorting_indent,
)
made_changes = made_changes or _has_changed(
before=code_sorting_section,
after=sorted_code,
line_separator=line_separator,
ignore_whitespace=config.ignore_whitespace,
)
if is_reexport:
output_stream.seek(sort_section_size, 0)
sort_section_size += output_stream.write(sorted_code)
not_imports = True
code_sorting = False
code_sorting_section = ""
code_sorting_indent = ""
is_reexport = False
else:
code_sorting_section += line
line = ""
elif (
stripped_line in config.section_comments
or stripped_line in config.section_comments_end
):
if import_section and not contains_imports:
output_stream.write(import_section)
import_section = line
not_imports = False
else:
import_section += line
indent = line[: -len(line.lstrip())]
elif not (stripped_line or contains_imports):
not_imports = True
elif (
not stripped_line
or stripped_line.startswith("#")
and (not indent or indent + line.lstrip() == line)
and not config.treat_all_comments_as_code
and stripped_line not in config.treat_comments_as_code
):
import_section += line
elif stripped_line.startswith(IMPORT_START_IDENTIFIERS):
new_indent = line[: -len(line.lstrip())]
import_statement = line
stripped_line = line.strip().split("#")[0]
while stripped_line.endswith("\\") or (
"(" in stripped_line and ")" not in stripped_line
):
if stripped_line.endswith("\\"):
while stripped_line and stripped_line.endswith("\\"):
line = input_stream.readline()
stripped_line = line.strip().split("#")[0]
import_statement += line
else:
while ")" not in stripped_line:
line = input_stream.readline()
if not line: # end of file without closing parenthesis
raise ExistingSyntaxErrors("Parenthesis is not closed")
stripped_line = line.strip().split("#")[0]
import_statement += line
if (
import_statement.lstrip().startswith("from")
and "import" not in import_statement
):
line = import_statement
not_imports = True
else:
did_contain_imports = contains_imports
contains_imports = True
cimport_statement: bool = False
if (
import_statement.lstrip().startswith(CIMPORT_IDENTIFIERS)
or " cimport " in import_statement
or " cimport*" in import_statement
or " cimport(" in import_statement
or (
".cimport" in import_statement
and "cython.cimports" not in import_statement
) # Allow pure python imports. See #2062
):
cimport_statement = True
if cimport_statement != cimports or (
new_indent != indent
and import_section
and (not did_contain_imports or len(new_indent) < len(indent))
):
indent = new_indent
if import_section:
next_cimports = cimport_statement
next_import_section = import_statement
import_statement = ""
not_imports = True
line = ""
else:
cimports = cimport_statement
else:
if new_indent != indent:
if import_section and did_contain_imports:
import_statement = indent + import_statement.lstrip()
else:
indent = new_indent
import_section += import_statement
else:
not_imports = True
sort_section_size += len(line)
if not_imports:
if not was_in_quote and config.lines_before_imports > -1:
if line.strip() == "":
lines_before += line
continue
if not import_section:
output_stream.write("".join(lines_before))
lines_before = []
raw_import_section: str = import_section
if (
add_imports
and (stripped_line or end_of_file)
and not config.append_only
and not in_top_comment
and not was_in_quote
and not import_section
and not line.lstrip().startswith(COMMENT_INDICATORS)
and not (line.rstrip().endswith(DOCSTRING_INDICATORS) and "=" not in line)
):
add_line_separator = line_separator or "\n"
import_section = add_line_separator.join(add_imports) + add_line_separator
if end_of_file and index != 0:
output_stream.write(add_line_separator)
contains_imports = True
add_imports = []
if next_import_section and not import_section: # pragma: no cover
raw_import_section = import_section = next_import_section
next_import_section = ""
if import_section:
if add_imports and (contains_imports or not config.append_only) and not indent:
import_section = (
line_separator.join(add_imports) + line_separator + import_section
)
contains_imports = True
add_imports = []
if not indent:
import_section += line
raw_import_section += line
if not contains_imports:
output_stream.write(import_section)
else:
leading_whitespace = import_section[: -len(import_section.lstrip())]
trailing_whitespace = import_section[len(import_section.rstrip()) :]
if first_import_section and not import_section.lstrip(
line_separator
).startswith(COMMENT_INDICATORS):
import_section = import_section.lstrip(line_separator)
raw_import_section = raw_import_section.lstrip(line_separator)
first_import_section = False
if indent:
import_section = "".join(
line[len(indent) :] for line in import_section.splitlines(keepends=True)
)
parsed_content = parse.file_contents(import_section, config=config)
verbose_output += parsed_content.verbose_output
sorted_import_section = output.sorted_imports(
parsed_content,
_indented_config(config, indent),
extension,
import_type="cimport" if cimports else "import",
)
if not (import_section.strip() and not sorted_import_section):
if indent:
sorted_import_section = (
leading_whitespace
+ textwrap.indent(sorted_import_section, indent).strip()
+ trailing_whitespace
)
made_changes = made_changes or _has_changed(
before=raw_import_section,
after=sorted_import_section,
line_separator=line_separator,
ignore_whitespace=config.ignore_whitespace,
)
output_stream.write(sorted_import_section)
if not line and not indent and next_import_section:
output_stream.write(line_separator)
if indent:
output_stream.write(line)
if not next_import_section:
indent = ""
if next_import_section:
cimports = next_cimports
contains_imports = True
else:
contains_imports = False
import_section = next_import_section
next_import_section = ""
else:
output_stream.write(line)
not_imports = False
if stripped_line and not in_quote and not import_section and not next_import_section:
if stripped_line == "yield":
while not stripped_line or stripped_line == "yield":
new_line = input_stream.readline()
if not new_line:
break
output_stream.write(new_line)
stripped_line = new_line.strip().split("#")[0]
if stripped_line.startswith("raise") or stripped_line.startswith("yield"):
while stripped_line.endswith("\\"):
new_line = input_stream.readline()
if not new_line:
break
output_stream.write(new_line)
stripped_line = new_line.strip().split("#")[0]
if made_changes and config.only_modified:
for output_str in verbose_output:
print(output_str)
return made_changes
def _indented_config(config: Config, indent: str) -> Config:
if not indent:
return config
return Config(
config=config,
line_length=max(config.line_length - len(indent), 0),
wrap_length=max(config.wrap_length - len(indent), 0),
lines_after_imports=1,
import_headings=config.import_headings if config.indented_import_headings else {},
import_footers=config.import_footers if config.indented_import_headings else {},
)
def _has_changed(before: str, after: str, line_separator: str, ignore_whitespace: bool) -> bool:
if ignore_whitespace:
return (
remove_whitespace(before, line_separator=line_separator).strip()
!= remove_whitespace(after, line_separator=line_separator).strip()
)
return before.strip() != after.strip()