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import ast
from pprint import PrettyPrinter
from typing import Any, Callable, Dict, List, Set, Tuple
from isort.exceptions import (
AssignmentsFormatMismatch,
LiteralParsingFailure,
LiteralSortTypeMismatch,
)
from isort.settings import DEFAULT_CONFIG, Config
class ISortPrettyPrinter(PrettyPrinter):
"""an isort customized pretty printer for sorted literals"""
def __init__(self, config: Config):
super().__init__(width=config.line_length, compact=True)
type_mapping: Dict[str, Tuple[type, Callable[[Any, ISortPrettyPrinter], str]]] = {}
def assignments(code: str) -> str:
values = {}
for line in code.splitlines(keepends=True):
if not line.strip():
continue
if " = " not in line:
raise AssignmentsFormatMismatch(code)
variable_name, value = line.split(" = ", 1)
values[variable_name] = value
return "".join(
f"{variable_name} = {values[variable_name]}" for variable_name in sorted(values.keys())
)
def assignment(code: str, sort_type: str, extension: str, config: Config = DEFAULT_CONFIG) -> str:
"""Sorts the literal present within the provided code against the provided sort type,
returning the sorted representation of the source code.
"""
if sort_type == "assignments":
return assignments(code)
if sort_type not in type_mapping:
raise ValueError(
"Trying to sort using an undefined sort_type. "
f"Defined sort types are {', '.join(type_mapping.keys())}."
)
variable_name, literal = code.split("=")
variable_name = variable_name.strip()
literal = literal.lstrip()
try:
value = ast.literal_eval(literal)
except Exception as error:
raise LiteralParsingFailure(code, error)
expected_type, sort_function = type_mapping[sort_type]
if type(value) != expected_type:
raise LiteralSortTypeMismatch(type(value), expected_type)
printer = ISortPrettyPrinter(config)
sorted_value_code = f"{variable_name} = {sort_function(value, printer)}"
if config.formatting_function:
sorted_value_code = config.formatting_function(
sorted_value_code, extension, config
).rstrip()
sorted_value_code += code[len(code.rstrip()) :]
return sorted_value_code
def register_type(
name: str, kind: type
) -> Callable[[Callable[[Any, ISortPrettyPrinter], str]], Callable[[Any, ISortPrettyPrinter], str]]:
"""Registers a new literal sort type."""
def wrap(
function: Callable[[Any, ISortPrettyPrinter], str]
) -> Callable[[Any, ISortPrettyPrinter], str]:
type_mapping[name] = (kind, function)
return function
return wrap
@register_type("dict", dict)
def _dict(value: Dict[Any, Any], printer: ISortPrettyPrinter) -> str:
return printer.pformat(dict(sorted(value.items(), key=lambda item: item[1]))) # type: ignore
@register_type("list", list)
def _list(value: List[Any], printer: ISortPrettyPrinter) -> str:
return printer.pformat(sorted(value))
@register_type("unique-list", list)
def _unique_list(value: List[Any], printer: ISortPrettyPrinter) -> str:
return printer.pformat(list(sorted(set(value))))
@register_type("set", set)
def _set(value: Set[Any], printer: ISortPrettyPrinter) -> str:
return "{" + printer.pformat(tuple(sorted(value)))[1:-1] + "}"
@register_type("tuple", tuple)
def _tuple(value: Tuple[Any, ...], printer: ISortPrettyPrinter) -> str:
return printer.pformat(tuple(sorted(value)))
@register_type("unique-tuple", tuple)
def _unique_tuple(value: Tuple[Any, ...], printer: ISortPrettyPrinter) -> str:
return printer.pformat(tuple(sorted(set(value))))