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""""""
from pathlib import Path
from typing import Iterator, NamedTuple, Optional, TextIO
from isort.parse import _normalize_line, _strip_syntax, skip_line
from .comments import parse as parse_comments
from .settings import DEFAULT_CONFIG, Config
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 line.lstrip().startswith(("import ", "cimport ")):
return "straight"
if line.lstrip().startswith("from "):
return "from"
return None
class IdentifiedImport(NamedTuple):
line_number: int
indented: bool
module: str
attribute: Optional[str] = None
alias: Optional[str] = None
cimport: bool = False
file_path: Optional[Path] = None
def imports(
input_stream: TextIO, config: Config = DEFAULT_CONFIG, file_path: Optional[Path] = None
) -> Iterator[IdentifiedImport]:
"""Parses a python file taking out and categorizing imports."""
in_quote = ""
indexed_input = enumerate(input_stream)
for index, line in indexed_input:
(skipping_line, in_quote) = skip_line(
line, in_quote=in_quote, index=index, section_comments=config.section_comments
)
if skipping_line:
continue
line, *end_of_line_comment = line.split("#", 1)
indented = line.startswith(" ") or line.startswith("\n")
statements = [line.strip() for line in line.split(";")]
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 ""
if not type_of_import:
continue
import_string, _ = parse_comments(line)
normalized_import_string = (
import_string.replace("import(", "import (").replace("\\", " ").replace("\n", " ")
)
cimports: bool = (
" cimport " in normalized_import_string
or normalized_import_string.startswith("cimport")
)
if "(" in line.split("#", 1)[0]:
while not line.split("#")[0].strip().endswith(")"):
try:
index, next_line = next(indexed_input)
except StopIteration:
break
line, _ = parse_comments(next_line)
import_string += "\n" + line
else:
while line.strip().endswith("\\"):
index, next_line = next(indexed_input)
line, _ = parse_comments(next_line)
# Still need to check for parentheses after an escaped line
if "(" in line.split("#")[0] and ")" not in line.split("#")[0]:
import_string += "\n" + line
while not line.split("#")[0].strip().endswith(")"):
try:
index, next_line = next(indexed_input)
except StopIteration:
break
line, _ = parse_comments(next_line)
import_string += "\n" + line
if import_string.strip().endswith(
(" import", " cimport")
) or line.strip().startswith(("import ", "cimport ")):
import_string += "\n" + line
else:
import_string = import_string.rstrip().rstrip("\\") + " " + line.lstrip()
if type_of_import == "from":
import_string = (
import_string.replace("import(", "import (")
.replace("\\", " ")
.replace("\n", " ")
)
parts = import_string.split(" cimport " if cimports else " import ")
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()
]
direct_imports = just_imports[1:]
top_level_module = ""
if "as" in just_imports and (just_imports.index("as") + 1) < len(just_imports):
while "as" in just_imports:
attribute = None
as_index = just_imports.index("as")
if type_of_import == "from":
attribute = just_imports[as_index - 1]
top_level_module = just_imports[0]
module = top_level_module + "." + attribute
alias = just_imports[as_index + 1]
direct_imports.remove(attribute)
direct_imports.remove(alias)
direct_imports.remove("as")
just_imports[1:] = direct_imports
if attribute == alias and config.remove_redundant_aliases:
pass
else:
yield IdentifiedImport(
index,
indented,
top_level_module,
attribute,
alias=alias,
cimport=cimports,
file_path=file_path,
)
else:
module = just_imports[as_index - 1]
alias = just_imports[as_index + 1]
if not (module == alias and config.remove_redundant_aliases):
yield IdentifiedImport(
index,
indented,
module,
alias,
cimport=cimports,
file_path=file_path,
)
else:
if type_of_import == "from":
module = just_imports.pop(0)
for attribute in just_imports:
yield IdentifiedImport(
index,
indented,
module,
attribute,
file_path=file_path,
)
else:
for module in just_imports:
yield IdentifiedImport(
index,
indented,
module,
cimport=cimports,
file_path=file_path,
)
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