mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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205 lines
8.1 KiB
Python
205 lines
8.1 KiB
Python
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"""Fast stream based import identification.
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Eventually this will likely replace parse.py
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"""
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from functools import partial
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from pathlib import Path
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from typing import Iterator, NamedTuple, Optional, TextIO, Tuple
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from isort.parse import _normalize_line, _strip_syntax, skip_line
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from .comments import parse as parse_comments
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from .settings import DEFAULT_CONFIG, Config
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STATEMENT_DECLARATIONS: Tuple[str, ...] = ("def ", "cdef ", "cpdef ", "class ", "@", "async def")
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class Import(NamedTuple):
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line_number: int
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indented: bool
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module: str
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attribute: Optional[str] = None
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alias: Optional[str] = None
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cimport: bool = False
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file_path: Optional[Path] = None
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def statement(self) -> str:
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full_path = self.module
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if self.attribute:
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full_path += f".{self.attribute}"
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if self.alias:
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full_path += f" as {self.alias}"
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return f"{'cimport' if self.cimport else 'import'} {full_path}"
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def __str__(self):
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return (
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f"{self.file_path or ''}:{self.line_number} "
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f"{'indented ' if self.indented else ''}{self.statement()}"
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)
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def imports(
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input_stream: TextIO,
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config: Config = DEFAULT_CONFIG,
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file_path: Optional[Path] = None,
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top_only: bool = False,
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) -> Iterator[Import]:
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"""Parses a python file taking out and categorizing imports."""
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in_quote = ""
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indexed_input = enumerate(input_stream)
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for index, raw_line in indexed_input:
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(skipping_line, in_quote) = skip_line(
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raw_line, in_quote=in_quote, index=index, section_comments=config.section_comments
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)
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if top_only and not in_quote and raw_line.startswith(STATEMENT_DECLARATIONS):
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break
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if skipping_line:
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continue
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stripped_line = raw_line.strip().split("#")[0]
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if stripped_line.startswith("raise") or stripped_line.startswith("yield"):
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if stripped_line == "yield":
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while not stripped_line or stripped_line == "yield":
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try:
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index, next_line = next(indexed_input)
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except StopIteration:
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break
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stripped_line = next_line.strip().split("#")[0]
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while stripped_line.endswith("\\"):
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try:
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index, next_line = next(indexed_input)
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except StopIteration:
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break
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stripped_line = next_line.strip().split("#")[0]
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continue # pragma: no cover
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line, *end_of_line_comment = raw_line.split("#", 1)
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statements = [line.strip() for line in line.split(";")]
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if end_of_line_comment:
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statements[-1] = f"{statements[-1]}#{end_of_line_comment[0]}"
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for statement in statements:
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line, _raw_line = _normalize_line(statement)
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if line.startswith(("import ", "cimport ")):
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type_of_import = "straight"
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elif line.startswith("from "):
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type_of_import = "from"
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else:
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continue # pragma: no cover
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import_string, _ = parse_comments(line)
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normalized_import_string = (
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import_string.replace("import(", "import (").replace("\\", " ").replace("\n", " ")
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)
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cimports: bool = (
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" cimport " in normalized_import_string
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or normalized_import_string.startswith("cimport")
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)
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identified_import = partial(
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Import,
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index + 1, # line numbers use 1 based indexing
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raw_line.startswith((" ", "\t")),
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cimport=cimports,
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file_path=file_path,
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)
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if "(" in line.split("#", 1)[0]:
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while not line.split("#")[0].strip().endswith(")"):
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try:
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index, next_line = next(indexed_input)
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except StopIteration:
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break
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line, _ = parse_comments(next_line)
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import_string += "\n" + line
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else:
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while line.strip().endswith("\\"):
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try:
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index, next_line = next(indexed_input)
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except StopIteration:
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break
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line, _ = parse_comments(next_line)
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# Still need to check for parentheses after an escaped line
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if "(" in line.split("#")[0] and ")" not in line.split("#")[0]:
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import_string += "\n" + line
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while not line.split("#")[0].strip().endswith(")"):
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try:
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index, next_line = next(indexed_input)
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except StopIteration:
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break
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line, _ = parse_comments(next_line)
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import_string += "\n" + line
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else:
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if import_string.strip().endswith(
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(" import", " cimport")
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) or line.strip().startswith(("import ", "cimport ")):
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import_string += "\n" + line
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else:
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import_string = (
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import_string.rstrip().rstrip("\\") + " " + line.lstrip()
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)
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if type_of_import == "from":
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import_string = (
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import_string.replace("import(", "import (")
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.replace("\\", " ")
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.replace("\n", " ")
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)
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parts = import_string.split(" cimport " if cimports else " import ")
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from_import = parts[0].split(" ")
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import_string = (" cimport " if cimports else " import ").join(
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[from_import[0] + " " + "".join(from_import[1:])] + parts[1:]
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)
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just_imports = [
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item.replace("{|", "{ ").replace("|}", " }")
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for item in _strip_syntax(import_string).split()
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]
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direct_imports = just_imports[1:]
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top_level_module = ""
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if "as" in just_imports and (just_imports.index("as") + 1) < len(just_imports):
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while "as" in just_imports:
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attribute = None
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as_index = just_imports.index("as")
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if type_of_import == "from":
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attribute = just_imports[as_index - 1]
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top_level_module = just_imports[0]
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module = top_level_module + "." + attribute
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alias = just_imports[as_index + 1]
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direct_imports.remove(attribute)
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direct_imports.remove(alias)
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direct_imports.remove("as")
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just_imports[1:] = direct_imports
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if attribute == alias and config.remove_redundant_aliases:
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yield identified_import(top_level_module, attribute)
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else:
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yield identified_import(top_level_module, attribute, alias=alias)
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else:
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module = just_imports[as_index - 1]
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alias = just_imports[as_index + 1]
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just_imports.remove(alias)
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just_imports.remove("as")
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just_imports.remove(module)
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if module == alias and config.remove_redundant_aliases:
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yield identified_import(module)
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else:
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yield identified_import(module, alias=alias)
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if just_imports:
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if type_of_import == "from":
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module = just_imports.pop(0)
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for attribute in just_imports:
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yield identified_import(module, attribute)
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else:
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for module in just_imports:
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yield identified_import(module)
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