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"""Defines parsing functions used by isort for parsing import definitions"""
from collections import OrderedDict, defaultdict
from functools import partial
from itertools import chain
from typing import TYPE_CHECKING, Any, Dict, List, NamedTuple, Optional, Set, Tuple
from warnings import warn
from . import place
from .comments import parse as parse_comments
from .exceptions import MissingSection
from .settings import DEFAULT_CONFIG, Config
if TYPE_CHECKING:
from mypy_extensions import TypedDict
CommentsAboveDict = TypedDict(
"CommentsAboveDict", {"straight": Dict[str, Any], "from": Dict[str, Any]}
)
CommentsDict = TypedDict(
"CommentsDict",
{
"from": Dict[str, Any],
"straight": Dict[str, Any],
"nested": Dict[str, Any],
"above": CommentsAboveDict,
},
)
def _infer_line_separator(contents: str) -> str:
if "\r\n" in contents:
return "\r\n"
if "\r" in contents:
return "\r"
return "\n"
def _normalize_line(raw_line: str) -> Tuple[str, str]:
"""Normalizes import related statements in the provided line.
Returns (normalized_line: str, raw_line: str)
"""
line = raw_line.replace("from.import ", "from . import ")
line = line.replace("from.cimport ", "from . cimport ")
line = line.replace("import*", "import *")
line = line.replace(" .import ", " . import ")
line = line.replace(" .cimport ", " . cimport ")
line = line.replace("\t", " ")
return (line, raw_line)
def import_type(line: str, config: Config = DEFAULT_CONFIG) -> Optional[str]:
"""If the current line is an import line it will return its type (from or straight)"""
if config.honor_noqa and line.lower().rstrip().endswith("noqa"):
return None
if "isort:skip" in line or "isort: skip" in line or "isort: split" in line:
return None
if line.startswith(("import ", "cimport ")):
return "straight"
if line.startswith("from "):
return "from"
return None
def _strip_syntax(import_string: str) -> str:
import_string = import_string.replace("_import", "[[i]]")
import_string = import_string.replace("_cimport", "[[ci]]")
for remove_syntax in ["\\", "(", ")", ","]:
import_string = import_string.replace(remove_syntax, " ")
import_list = import_string.split()
for key in ("from", "import", "cimport"):
if key in import_list:
import_list.remove(key)
import_string = " ".join(import_list)
import_string = import_string.replace("[[i]]", "_import")
import_string = import_string.replace("[[ci]]", "_cimport")
return import_string.replace("{ ", "{|").replace(" }", "|}")
def skip_line(
line: str,
in_quote: str,
index: int,
section_comments: Tuple[str, ...],
needs_import: bool = True,
) -> Tuple[bool, str]:
"""Determine if a given line should be skipped.
Returns back a tuple containing:
(skip_line: bool,
in_quote: str,)
"""
should_skip = bool(in_quote)
if '"' in line or "'" in line:
char_index = 0
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 = ""
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
if ";" in line.split("#")[0] and needs_import:
for part in (part.strip() for part in line.split(";")):
if (
part
and not part.startswith("from ")
and not part.startswith(("import ", "cimport "))
):
should_skip = True
return (bool(should_skip or in_quote), in_quote)
class ParsedContent(NamedTuple):
in_lines: List[str]
lines_without_imports: List[str]
import_index: int
place_imports: Dict[str, List[str]]
import_placements: Dict[str, str]
as_map: Dict[str, Dict[str, List[str]]]
imports: Dict[str, Dict[str, Any]]
categorized_comments: "CommentsDict"
change_count: int
original_line_count: int
line_separator: str
sections: Any
verbose_output: List[str]
trailing_commas: Set[str]
def file_contents(contents: str, config: Config = DEFAULT_CONFIG) -> ParsedContent:
"""Parses a python file taking out and categorizing imports."""
line_separator: str = config.line_ending or _infer_line_separator(contents)
in_lines = contents.splitlines()
if contents and contents[-1] in ("\n", "\r"):
in_lines.append("")
out_lines = []
original_line_count = len(in_lines)
if config.old_finders:
from .deprecated.finders import FindersManager
finder = FindersManager(config=config).find
else:
finder = partial(place.module, config=config)
line_count = len(in_lines)
place_imports: Dict[str, List[str]] = {}
import_placements: Dict[str, str] = {}
as_map: Dict[str, Dict[str, List[str]]] = {
"straight": defaultdict(list),
"from": defaultdict(list),
}
imports: OrderedDict[str, Dict[str, Any]] = OrderedDict()
verbose_output: List[str] = []
for section in chain(config.sections, config.forced_separate):
imports[section] = {"straight": OrderedDict(), "from": OrderedDict()}
categorized_comments: CommentsDict = {
"from": {},
"straight": {},
"nested": {},
"above": {"straight": {}, "from": {}},
}
trailing_commas: Set[str] = set()
index = 0
import_index = -1
in_quote = ""
while index < line_count:
line = in_lines[index]
index += 1
statement_index = index
(skipping_line, in_quote) = skip_line(
line, in_quote=in_quote, index=index, section_comments=config.section_comments
)
if (
line in config.section_comments or line in config.section_comments_end
) and not skipping_line:
if import_index == -1: # pragma: no branch
import_index = index - 1
continue
if "isort:imports-" in line and line.startswith("#"):
section = line.split("isort:imports-")[-1].split()[0].upper()
place_imports[section] = []
import_placements[line] = section
elif "isort: imports-" in line and line.startswith("#"):
section = line.split("isort: imports-")[-1].split()[0].upper()
place_imports[section] = []
import_placements[line] = section
if skipping_line:
out_lines.append(line)
continue
lstripped_line = line.lstrip()
if (
config.float_to_top
and import_index == -1
and line
and not in_quote
and not lstripped_line.startswith("#")
and not lstripped_line.startswith("'''")
and not lstripped_line.startswith('"""')
):
if not lstripped_line.startswith("import") and not lstripped_line.startswith("from"):
import_index = index - 1
while import_index and not in_lines[import_index - 1]:
import_index -= 1
else:
commentless = line.split("#", 1)[0].strip()
if (
("isort:skip" in line or "isort: skip" in line)
and "(" in commentless
and ")" not in commentless
):
import_index = index
starting_line = line
while "isort:skip" in starting_line or "isort: skip" in starting_line:
commentless = starting_line.split("#", 1)[0]
if (
"(" in commentless
and not commentless.rstrip().endswith(")")
and import_index < line_count
):
while import_index < line_count and not commentless.rstrip().endswith(
")"
):
commentless = in_lines[import_index].split("#", 1)[0]
import_index += 1
else:
import_index += 1
if import_index >= line_count:
break
starting_line = in_lines[import_index]
line, *end_of_line_comment = line.split("#", 1)
if ";" in line:
statements = [line.strip() for line in line.split(";")]
else:
statements = [line]
if end_of_line_comment:
statements[-1] = f"{statements[-1]}#{end_of_line_comment[0]}"
for statement in statements:
line, raw_line = _normalize_line(statement)
type_of_import = import_type(line, config) or ""
raw_lines = [raw_line]
if not type_of_import:
out_lines.append(raw_line)
continue
if import_index == -1:
import_index = index - 1
nested_comments = {}
import_string, comment = parse_comments(line)
comments = [comment] if comment else []
line_parts = [part for part in _strip_syntax(import_string).strip().split(" ") if part]
if type_of_import == "from" and len(line_parts) == 2 and comments:
nested_comments[line_parts[-1]] = comments[0]
if "(" in line.split("#", 1)[0] and index < line_count:
while not line.split("#")[0].strip().endswith(")") and index < line_count:
line, new_comment = parse_comments(in_lines[index])
index += 1
if new_comment:
comments.append(new_comment)
stripped_line = _strip_syntax(line).strip()
if (
type_of_import == "from"
and stripped_line
and " " not in stripped_line.replace(" as ", "")
and new_comment
):
nested_comments[stripped_line] = comments[-1]
import_string += line_separator + line
raw_lines.append(line)
else:
while line.strip().endswith("\\"):
line, new_comment = parse_comments(in_lines[index])
line = line.lstrip()
index += 1
if new_comment:
comments.append(new_comment)
# Still need to check for parentheses after an escaped line
if (
"(" in line.split("#")[0]
and ")" not in line.split("#")[0]
and index < line_count
):
stripped_line = _strip_syntax(line).strip()
if (
type_of_import == "from"
and stripped_line
and " " not in stripped_line.replace(" as ", "")
and new_comment
):
nested_comments[stripped_line] = comments[-1]
import_string += line_separator + line
raw_lines.append(line)
while not line.split("#")[0].strip().endswith(")") and index < line_count:
line, new_comment = parse_comments(in_lines[index])
index += 1
if new_comment:
comments.append(new_comment)
stripped_line = _strip_syntax(line).strip()
if (
type_of_import == "from"
and stripped_line
and " " not in stripped_line.replace(" as ", "")
and new_comment
):
nested_comments[stripped_line] = comments[-1]
import_string += line_separator + line
raw_lines.append(line)
stripped_line = _strip_syntax(line).strip()
if (
type_of_import == "from"
and stripped_line
and " " not in stripped_line.replace(" as ", "")
and new_comment
):
nested_comments[stripped_line] = comments[-1]
if import_string.strip().endswith(
(" import", " cimport")
) or line.strip().startswith(("import ", "cimport ")):
import_string += line_separator + line
else:
import_string = import_string.rstrip().rstrip("\\") + " " + line.lstrip()
if type_of_import == "from":
cimports: bool
import_string = (
import_string.replace("import(", "import (")
.replace("\\", " ")
.replace("\n", " ")
)
if "import " not in import_string:
out_lines.extend(raw_lines)
continue
if " cimport " in import_string:
parts = import_string.split(" cimport ")
cimports = True
else:
parts = import_string.split(" import ")
cimports = False
from_import = parts[0].split(" ")
import_string = (" cimport " if cimports else " import ").join(
[from_import[0] + " " + "".join(from_import[1:])] + parts[1:]
)
just_imports = [
item.replace("{|", "{ ").replace("|}", " }")
for item in _strip_syntax(import_string).split()
]
attach_comments_to: Optional[List[Any]] = None
direct_imports = just_imports[1:]
straight_import = True
top_level_module = ""
if "as" in just_imports and (just_imports.index("as") + 1) < len(just_imports):
straight_import = False
while "as" in just_imports:
nested_module = None
as_index = just_imports.index("as")
if type_of_import == "from":
nested_module = just_imports[as_index - 1]
top_level_module = just_imports[0]
module = top_level_module + "." + nested_module
as_name = just_imports[as_index + 1]
direct_imports.remove(nested_module)
direct_imports.remove(as_name)
direct_imports.remove("as")
if nested_module == as_name and config.remove_redundant_aliases:
pass
elif as_name not in as_map["from"][module]: # pragma: no branch
as_map["from"][module].append(as_name)
full_name = f"{nested_module} as {as_name}"
associated_comment = nested_comments.get(full_name)
if associated_comment:
categorized_comments["nested"].setdefault(top_level_module, {})[
full_name
] = associated_comment
if associated_comment in comments: # pragma: no branch
comments.pop(comments.index(associated_comment))
else:
module = just_imports[as_index - 1]
as_name = just_imports[as_index + 1]
if module == as_name and config.remove_redundant_aliases:
pass
elif as_name not in as_map["straight"][module]:
as_map["straight"][module].append(as_name)
if comments and attach_comments_to is None:
if nested_module and config.combine_as_imports:
attach_comments_to = categorized_comments["from"].setdefault(
f"{top_level_module}.__combined_as__", []
)
else:
if type_of_import == "from" or (
config.remove_redundant_aliases and as_name == module.split(".")[-1]
):
attach_comments_to = categorized_comments["straight"].setdefault(
module, []
)
else:
attach_comments_to = categorized_comments["straight"].setdefault(
f"{module} as {as_name}", []
)
del just_imports[as_index : as_index + 2]
if type_of_import == "from":
import_from = just_imports.pop(0)
placed_module = finder(import_from)
if config.verbose and not config.only_modified:
print(f"from-type place_module for {import_from} returned {placed_module}")
elif config.verbose:
verbose_output.append(
f"from-type place_module for {import_from} returned {placed_module}"
)
if placed_module == "":
warn(
f"could not place module {import_from} of line {line} --"
" Do you need to define a default section?"
)
if placed_module and placed_module not in imports:
raise MissingSection(import_module=import_from, section=placed_module)
root = imports[placed_module][type_of_import] # type: ignore
for import_name in just_imports:
associated_comment = nested_comments.get(import_name)
if associated_comment:
categorized_comments["nested"].setdefault(import_from, {})[
import_name
] = associated_comment
if associated_comment in comments: # pragma: no branch
comments.pop(comments.index(associated_comment))
if (
config.force_single_line
and comments
and attach_comments_to is None
and len(just_imports) == 1
):
nested_from_comments = categorized_comments["nested"].setdefault(
import_from, {}
)
existing_comment = nested_from_comments.get(just_imports[0], "")
nested_from_comments[
just_imports[0]
] = f"{existing_comment}{'; ' if existing_comment else ''}{'; '.join(comments)}"
comments = []
if comments and attach_comments_to is None:
attach_comments_to = categorized_comments["from"].setdefault(import_from, [])
if len(out_lines) > max(import_index, 1) - 1:
last = out_lines[-1].rstrip() if out_lines else ""
while (
last.startswith("#")
and not last.endswith('"""')
and not last.endswith("'''")
and "isort:imports-" not in last
and "isort: imports-" not in last
and not config.treat_all_comments_as_code
and not last.strip() in config.treat_comments_as_code
):
categorized_comments["above"]["from"].setdefault(import_from, []).insert(
0, out_lines.pop(-1)
)
if out_lines:
last = out_lines[-1].rstrip()
else:
last = ""
if statement_index - 1 == import_index: # pragma: no cover
import_index -= len(
categorized_comments["above"]["from"].get(import_from, [])
)
if import_from not in root:
root[import_from] = OrderedDict(
(module, module in direct_imports) for module in just_imports
)
else:
root[import_from].update(
(module, root[import_from].get(module, False) or module in direct_imports)
for module in just_imports
)
if comments and attach_comments_to is not None:
attach_comments_to.extend(comments)
if "," in import_string.split(just_imports[-1])[-1]:
trailing_commas.add(import_from)
else:
if comments and attach_comments_to is not None:
attach_comments_to.extend(comments)
comments = []
for module in just_imports:
if comments:
categorized_comments["straight"][module] = comments
comments = []
if len(out_lines) > max(import_index, +1, 1) - 1:
last = out_lines[-1].rstrip() if out_lines else ""
while (
last.startswith("#")
and not last.endswith('"""')
and not last.endswith("'''")
and "isort:imports-" not in last
and "isort: imports-" not in last
and not config.treat_all_comments_as_code
and not last.strip() in config.treat_comments_as_code
):
categorized_comments["above"]["straight"].setdefault(module, []).insert(
0, out_lines.pop(-1)
)
if out_lines:
last = out_lines[-1].rstrip()
else:
last = ""
if index - 1 == import_index:
import_index -= len(
categorized_comments["above"]["straight"].get(module, [])
)
placed_module = finder(module)
if config.verbose and not config.only_modified:
print(f"else-type place_module for {module} returned {placed_module}")
elif config.verbose:
verbose_output.append(
f"else-type place_module for {module} returned {placed_module}"
)
if placed_module == "":
warn(
f"could not place module {module} of line {line} --"
" Do you need to define a default section?"
)
imports.setdefault("", {"straight": OrderedDict(), "from": OrderedDict()})
if placed_module and placed_module not in imports:
raise MissingSection(import_module=module, section=placed_module)
straight_import |= imports[placed_module][type_of_import].get( # type: ignore
module, False
)
imports[placed_module][type_of_import][module] = straight_import # type: ignore
change_count = len(out_lines) - original_line_count
return ParsedContent(
in_lines=in_lines,
lines_without_imports=out_lines,
import_index=import_index,
place_imports=place_imports,
import_placements=import_placements,
as_map=as_map,
imports=imports,
categorized_comments=categorized_comments,
change_count=change_count,
original_line_count=original_line_count,
line_separator=line_separator,
sections=config.sections,
verbose_output=verbose_output,
trailing_commas=trailing_commas,
)
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