2048374408

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feat: set initial style url(s) with nitpick init (#473)

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/src/nitpick/blender.py

"""Dictionary blender and configuration file formats.

.. testsetup::

    from nitpick.generic import *
"""
from __future__ import annotations

import abc
import json
import re
import shlex
from functools import lru_cache, partial
from pathlib import Path
from typing import Any, Callable, TypeVar, cast

import dictdiffer
import jmespath
import toml
import tomlkit
from attr import define  # type: ignore[attr-defined]
from autorepr import autorepr
from flatten_dict import flatten, unflatten
from jmespath.parser import ParsedResult
from ruamel.yaml import YAML, RoundTripRepresenter, StringIO
from sortedcontainers import SortedDict
from tomlkit import items

from nitpick.config import SpecialConfig
from nitpick.typedefs import ElementData, JsonDict, ListOrCommentedSeq, PathOrStr, YamlObject, YamlValue

# Generic type for classes that inherit from BaseDoc
TBaseDoc = TypeVar("TBaseDoc", bound="BaseDoc")

SINGLE_QUOTE = "'"
DOUBLE_QUOTE = '"'

SEPARATOR_DOT = "."
SEPARATOR_COMMA = ","
SEPARATOR_COLON = ":"
SEPARATOR_SPACE = " "

#: Special unique separator for :py:meth:`flatten()` and :py:meth:`unflatten()`,
# to avoid collision with existing key values (e.g. the default SEPARATOR_DOT separator "." can be part of a TOML key).
SEPARATOR_FLATTEN = "$#@"

#: Special unique separator for :py:meth:`nitpick.blender.quoted_split()`.
SEPARATOR_QUOTED_SPLIT = "#$@"


def compare_lists_with_dictdiffer(
    actual: list | dict, expected: list | dict, *, return_list: bool = True
) -> list | dict:
    """Compare two lists using dictdiffer."""
    additions_and_changes = [change for change in dictdiffer.diff(actual, expected) if change[0] != "remove"]
    if not additions_and_changes:
        return []

    try:
        changed_dict = dictdiffer.patch(additions_and_changes, {})
    except KeyError:
        return expected

    if return_list:
        return list(changed_dict.values())
    return changed_dict


def search_json(json_data: ElementData, jmespath_expression: ParsedResult | str, default: Any = None) -> Any:
    """Search a dictionary or list using a JMESPath expression. Return a default value if not found.

    >>> data = {"root": {"app": [1, 2], "test": "something"}}
    >>> search_json(data, "root.app", None)
    [1, 2]
    >>> search_json(data, "root.test", None)
    'something'
    >>> search_json(data, "root.unknown", "")
    ''
    >>> search_json(data, "root.unknown", None)

    >>> search_json(data, "root.unknown")

    >>> search_json(data, jmespath.compile("root.app"), [])
    [1, 2]
    >>> search_json(data, jmespath.compile("root.whatever"), "xxx")
    'xxx'
    >>> search_json(data, "")

    >>> search_json(data, None)

    :param jmespath_expression: A compiled JMESPath expression or a string with an expression.
    :param json_data: The dictionary to be searched.
    :param default: Default value in case nothing is found.
    :return: The object that was found or the default value.
    """
    if not jmespath_expression:
        return default
    if isinstance(jmespath_expression, str):
        rv = jmespath.search(jmespath_expression, json_data)
    else:
        rv = jmespath_expression.search(json_data)
    return rv or default


@define
class ElementDetail:  # pylint: disable=too-few-public-methods
    """Detailed information about an element of a list."""

    data: ElementData
    key: str | list[str]
    index: int
    scalar: bool
    compact: str

    @property
    def cast_to_dict(self) -> JsonDict:
        """Data cast to dict, for mypy."""
        return cast(JsonDict, self.data)

    @classmethod
    def from_data(cls, index: int, data: ElementData, jmes_key: str) -> ElementDetail:
        """Create an element detail from dict data."""
        if isinstance(data, (list, dict)):
            scalar = False
            compact = json.dumps(data, sort_keys=True, separators=(SEPARATOR_COMMA, SEPARATOR_COLON))
            key = search_json(data, jmes_key)
            if not key:
                key = compact
        else:
            scalar = True
            key = compact = str(data)
        return ElementDetail(data=data, key=key, index=index, scalar=scalar, compact=compact)


@define
class ListDetail:  # pylint: disable=too-few-public-methods
    """Detailed info about a list."""

    data: ListOrCommentedSeq
    elements: list[ElementDetail]

    @classmethod
    def from_data(cls, data: ListOrCommentedSeq, jmes_key: str) -> ListDetail:
        """Create a list detail from list data."""
        return ListDetail(
            data=data, elements=[ElementDetail.from_data(index, data, jmes_key) for index, data in enumerate(data)]
        )

    def find_by_key(self, desired: ElementDetail) -> ElementDetail | None:
        """Find an element by key."""
        for actual in self.elements:
            if isinstance(desired.key, list):
                if set(desired.key).issubset(set(actual.key)):
                    return actual
            else:
                if desired.key == actual.key:
                    return actual
        return None


def set_key_if_not_empty(dict_: JsonDict, key: str, value: Any) -> None:
    """Update the dict if the value is valid."""
    if not value:
        return
    dict_[key] = value


def quoted_split(string_: str, separator=SEPARATOR_DOT) -> list[str]:
    """Split a string by a separator, but considering quoted parts (single or double quotes).

    >>> quoted_split("my.key.without.quotes")
    ['my', 'key', 'without', 'quotes']
    >>> quoted_split('"double.quoted.string"')
    ['double.quoted.string']
    >>> quoted_split('"double.quoted.string".and.after')
    ['double.quoted.string', 'and', 'after']
    >>> quoted_split('something.before."double.quoted.string"')
    ['something', 'before', 'double.quoted.string']
    >>> quoted_split("'single.quoted.string'")
    ['single.quoted.string']
    >>> quoted_split("'single.quoted.string'.and.after")
    ['single.quoted.string', 'and', 'after']
    >>> quoted_split("something.before.'single.quoted.string'")
    ['something', 'before', 'single.quoted.string']
    """
    if DOUBLE_QUOTE not in string_ and SINGLE_QUOTE not in string_:
        return string_.split(separator)

    quoted_regex = re.compile(
        f"([{SINGLE_QUOTE}{DOUBLE_QUOTE}][^{SINGLE_QUOTE}{DOUBLE_QUOTE}]+[{SINGLE_QUOTE}{DOUBLE_QUOTE}])"
    )

    def remove_quotes(match):
        return match.group(0).strip("".join([SINGLE_QUOTE, DOUBLE_QUOTE])).replace(separator, SEPARATOR_QUOTED_SPLIT)

    return [
        part.replace(SEPARATOR_QUOTED_SPLIT, separator)
        for part in quoted_regex.sub(remove_quotes, string_).split(separator)
    ]


def quote_if_dotted(key: str) -> str:
    """Quote the key if it has a dot."""
    if not isinstance(key, str):
        return key
    if SEPARATOR_DOT in key and DOUBLE_QUOTE not in key:
        return f"{DOUBLE_QUOTE}{key}{DOUBLE_QUOTE}"
    return key


def quote_reducer(separator: str) -> Callable:
    """Reducer used to unflatten dicts. Quote keys when they have dots."""

    def _inner_quote_reducer(key1: str | None, key2: str) -> str:
        if key1 is None:
            return quote_if_dotted(key2)
        return f"{key1}{separator}{quote_if_dotted(key2)}"

    return _inner_quote_reducer


def quotes_splitter(flat_key: str) -> tuple[str, ...]:
    """Split keys keeping quoted strings together."""
    return tuple(
        piece.replace(SEPARATOR_SPACE, SEPARATOR_DOT) if SEPARATOR_SPACE in piece else piece
        for piece in shlex.split(flat_key.replace(SEPARATOR_DOT, SEPARATOR_SPACE))
    )


def custom_reducer(separator: str) -> Callable:
    """Custom reducer for :py:meth:`flatten_dict.flatten_dict.flatten()` accepting a separator."""

    def _inner_custom_reducer(key1, key2):
        if key1 is None:
            return key2
        return f"{key1}{separator}{key2}"

    return _inner_custom_reducer


def custom_splitter(separator: str) -> Callable:
    """Custom splitter for :py:meth:`flatten_dict.flatten_dict.unflatten()` accepting a separator."""

    def _inner_custom_splitter(flat_key) -> tuple[str, ...]:
        keys = tuple(flat_key.split(separator))
        return keys

    return _inner_custom_splitter


# TODO: refactor: use only tomlkit and remove uiri/toml
#  - tomlkit preserves comments
#  - uiri/toml looks abandoned https://github.com/uiri/toml/issues/361
#  Code to be used with tomlkit when merging styles
# merged_dict = unflatten(self._merged_styles, toml_style_splitter)
# def toml_style_splitter(flat_key: str) -> Tuple[str, ...]:
#     """Splitter for TOML style files, in an attempt to remove empty TOML tables."""
#     original = flat_key.split(SEPARATOR_FLATTEN)
#     quoted = [quote_if_dotted(k) for k in original]
#
#     first = quoted.pop(0)
#     last = quoted.pop() if quoted else None
#
#     grouped = [first]
#     if quoted:
#         grouped.append(SEPARATOR_DOT.join(quoted))
#     if last:
#         grouped.append(last)
#     return tuple(grouped)


def flatten_quotes(dict_: JsonDict, separator=SEPARATOR_DOT) -> JsonDict:
    """Flatten a dict keeping quotes in keys."""
    dict_with_quoted_keys = flatten(dict_, reducer=quote_reducer(separator))
    clean_dict = {}
    for key, value in dict_with_quoted_keys.items():  # type: str, Any
        key_with_stripped_ends = key.strip(DOUBLE_QUOTE)
        if key_with_stripped_ends.count(DOUBLE_QUOTE):
            # Key has quotes in the middle; keep all quotes
            clean_dict[key] = value
        else:
            # Key only has quotes in the beginning and end; remove quotes
            clean_dict[key_with_stripped_ends] = value
    return clean_dict


unflatten_quotes = partial(unflatten, splitter=quotes_splitter)


class Comparison:
    """A comparison between two dictionaries, computing missing items and differences."""

    def __init__(self, actual: TBaseDoc, expected: JsonDict, special_config: SpecialConfig) -> None:
        self.flat_actual = flatten_quotes(actual.as_object)
        self.flat_expected = flatten_quotes(expected)

        self.doc_class = actual.__class__

        self.missing_dict: JsonDict = {}
        self.diff_dict: JsonDict = {}
        self.replace_dict: JsonDict = {}

        self.special_config = special_config

    @property
    def missing(self) -> TBaseDoc | None:
        """Missing data."""
        if not self.missing_dict:
            return None
        return self.doc_class(obj=(unflatten_quotes(self.missing_dict)))

    @property
    def diff(self) -> TBaseDoc | None:
        """Different data."""
        if not self.diff_dict:
            return None
        return self.doc_class(obj=(unflatten_quotes(self.diff_dict)))

    @property
    def replace(self) -> TBaseDoc | None:
        """Data to be replaced."""
        if not self.replace_dict:
            return None
        return self.doc_class(obj=unflatten_quotes(self.replace_dict))

    @property
    def has_changes(self) -> bool:
        """Return True is there is a difference or something missing."""
        return bool(self.missing or self.diff or self.replace)

    def __call__(self) -> Comparison:
        """Compare two flattened dictionaries and compute missing and different items."""
        if self.flat_expected.items() <= self.flat_actual.items():
            return self

        for key, expected_value in self.flat_expected.items():
            if key not in self.flat_actual:
                self.missing_dict[key] = expected_value
                self.replace_dict[key] = expected_value
                continue

            actual = self.flat_actual[key]
            if isinstance(expected_value, list):
                list_keys = self.special_config.list_keys.value.get(key, "")
                if SEPARATOR_DOT in list_keys:
                    parent_key, child_key = list_keys.rsplit(SEPARATOR_DOT, 1)
                    jmes_key = f"{parent_key}[].{child_key}"
                else:
                    parent_key = ""
                    child_key = list_keys
                    jmes_key = child_key

                self._compare_list_elements(
                    key,
                    parent_key,
                    child_key,
                    ListDetail.from_data(actual, jmes_key),
                    ListDetail.from_data(expected_value, jmes_key),
                )
            elif expected_value != actual:
                set_key_if_not_empty(self.diff_dict, key, expected_value)

        return self

    def _compare_list_elements(  # pylint: disable=too-many-arguments
        self, key: str, parent_key: str, child_key: str, actual_detail: ListDetail, expected_detail: ListDetail
    ) -> None:
        """Compare list elements by their keys or hashes."""
        display = []
        replace = actual_detail.data.copy()
        for expected_element in expected_detail.elements:
            actual_element = actual_detail.find_by_key(expected_element)
            if not actual_element:
                display.append(expected_element.data)
                replace.append(expected_element.data)
                continue

            if parent_key:
                new_block: JsonDict = self._compare_children(parent_key, child_key, actual_element, expected_element)
                if new_block:
                    display.append(expected_element.data)
                    replace[actual_element.index] = new_block
                continue

            diff = compare_lists_with_dictdiffer(
                actual_element.cast_to_dict, expected_element.cast_to_dict, return_list=False
            )
            if diff:
                new_block = cast(JsonDict, actual_element.data).copy()
                new_block.update(diff)
                display.append(new_block)
                replace[actual_element.index] = new_block

        if display:
            set_key_if_not_empty(self.missing_dict, key, display)
            set_key_if_not_empty(self.replace_dict, key, replace)

    @staticmethod
    def _compare_children(
        parent_key: str, child_key: str, actual_element: ElementDetail, expected_element: ElementDetail
    ) -> JsonDict:
        """Compare children of a JSON dict, return only the inner difference.

        E.g.: a pre-commit hook ID with different args will return a JSON only with the specific hook,
        not with all the hooks of the parent repo.
        """
        new_nested_block: JsonDict = {}
        jmes_nested = f"{parent_key}[?{child_key}=='{expected_element.key[0]}']"
        actual_nested = search_json(actual_element.data, jmes_nested, [])
        expected_nested = search_json(expected_element.data, jmes_nested, [{}])
        diff_nested = compare_lists_with_dictdiffer(actual_nested, expected_nested, return_list=True)
        if diff_nested:
            actual_data = cast(JsonDict, actual_element.data)
            expected_data = cast(JsonDict, expected_element.data)
            # TODO: fix: set value deep down the tree (try dpath-python). parent_key = 'regions[].cities[].people'
            expected_data[parent_key] = diff_nested

            new_nested_block = actual_data.copy()
            for nested_index, obj in enumerate(actual_data[parent_key]):
                if obj == actual_nested[0]:
                    new_nested_block[parent_key][nested_index] = diff_nested[0]
                    break
        return new_nested_block


class BaseDoc(metaclass=abc.ABCMeta):
    """Base class for configuration file formats.

    :param path: Path of the config file to be loaded.
    :param string: Config in string format.
    :param obj: Config object (Python dict, YamlDoc, TomlDoc instances).
    """

    __repr__ = autorepr(["path"])

    def __init__(self, *, path: PathOrStr = None, string: str = None, obj: JsonDict = None) -> None:
        self.path = path
        self._string = string
        self._object = obj

        self._reformatted: str | None = None

    @abc.abstractmethod
    def load(self) -> bool:
        """Load the configuration from a file, a string or a dict."""

    @property
    def as_string(self) -> str:
        """Contents of the file or the original string provided when the instance was created."""
        return self._string or ""

    @property
    def as_object(self) -> dict:
        """String content converted to a Python object (dict, YAML object instance, etc.)."""
        if self._object is None:
            self.load()
        return self._object or {}

    @property
    def reformatted(self) -> str:
        """Reformat the configuration dict as a new string (it might not match the original string/file contents)."""
        if self._reformatted is None:
            self.load()
        return self._reformatted or ""


class InlineTableTomlDecoder(toml.TomlDecoder):  # type: ignore[name-defined]
    """A hacky decoder to work around some bug (or unfinished work) in the Python TOML package.

    https://github.com/uiri/toml/issues/362.
    """

    def get_empty_inline_table(self):
        """Hackity hack for a crappy unmaintained package.

        Total lack of respect, the guy doesn't even reply: https://github.com/uiri/toml/issues/361
        """
        return self.get_empty_table()


class TomlDoc(BaseDoc):
    """TOML configuration format."""

    # TODO: refactor: use only tomlkit and remove uiri/toml
    #   remove __init__() completely
    def __init__(
        self,
        *,
        path: PathOrStr = None,
        string: str = None,
        obj: JsonDict = None,
        use_tomlkit=False,
    ) -> None:
        super().__init__(path=path, string=string, obj=obj)
        self.use_tomlkit = use_tomlkit

    @lru_cache()
    def load(self) -> bool:
        """Load a TOML file by its path, a string or a dict."""
        if self.path is not None:
            self._string = Path(self.path).read_text(encoding="UTF-8")
        if self._string is not None:
            # TODO: refactor: use only tomlkit and remove uiri/toml
            #  I tried to replace toml by tomlkit, but lots of tests break.
            if self.use_tomlkit:
                # TODO: refactor: use only tomlkit and remove uiri/toml
                #  Removing empty tables on loads() didn't work.
                #  The empty tables are gone, but:
                #  1. the output has 2 blank lines at the top
                #  2. the underlying dict is different than expected, and tests fail:
                #     'NIP001  has an incorrect style. Invalid config:',
                #     '"pyproject.toml".tool.black: Unknown file. See '
                #     'https://nitpick.rtfd.io/en/latest/plugins.html.']

                # toml_obj = tomlkit.loads(self._string)
                # if "tool.black" in self._string:
                #     from tomlkit.items import KeyType, SingleKey
                #
                #     black_dict = toml_obj["pyproject.toml"]["tool"]["black"]
                #     toml_obj["pyproject.toml"].remove("tool")
                #     toml_obj.remove("pyproject.toml")
                #     toml_obj.add(SingleKey('"pyproject.toml".tool.black', KeyType.Bare), black_dict)
                #     result = tomlkit.dumps(toml_obj)
                #     print(result)
                self._object = tomlkit.loads(self._string)
            else:
                self._object = toml.loads(self._string, decoder=InlineTableTomlDecoder(dict))  # type: ignore[call-arg,assignment]
        if self._object is not None:
            # TODO: fix: tomlkit.dumps() renders comments and I didn't find a way to turn this off,
            #  but comments are being lost when the TOML plugin does dict comparisons.
            if self.use_tomlkit:
                # TODO: refactor: use only tomlkit and remove uiri/toml
                #  Removing empty tables on dumps() didn't work.
                #  Another attempt would be to remove tables when dumping to TOML when setting self._reformatted:
                #  1. load a dict normally with loads()
                #  2. clean up TomlDocument and its empty tables recursively, reusing the code with SingleKey above
                #  3. dump the cleaned TomlDocument
                #  It looks like some effort. I'll wait for https://github.com/sdispater/tomlkit/issues/166
                # remove_empty_tables = unflatten(
                #     flatten(self._object, custom_reducer(SEPARATOR_FLATTEN)), toml_style_splitter
                # )
                self._reformatted = tomlkit.dumps(self._object, sort_keys=True)
            else:
                self._reformatted = toml.dumps(self._object)
        return True


def traverse_toml_tree(document: tomlkit.TOMLDocument, dictionary):
    """Traverse a TOML document recursively and change values, keeping its formatting and comments."""
    for key, value in dictionary.items():
        if isinstance(value, (dict,)):
            if key in document:
                traverse_toml_tree(document[key], value)
            else:
                document.add(key, value)
        else:
            document[key] = value


class SensibleYAML(YAML):
    """YAML with sensible defaults but an inefficient dump to string.

    `Output of dump() as a string <https://yaml.readthedocs.io/en/latest/example.html#output-of-dump-as-a-string>`_.
    """

    def __init__(self):
        super().__init__()
        self.map_indent = 2
        self.sequence_indent = 4
        self.sequence_dash_offset = 2
        self.preserve_quotes = True

    def loads(self, string: str):
        """Load YAML from a string... that unusual use case in a world of files only."""
        return self.load(StringIO(string))

    def dumps(self, data) -> str:
        """Dump to a string... who would want such a thing? One can dump to a file or stdout."""
        output = StringIO()
        self.dump(data, output, transform=None)
        return output.getvalue()


class YamlDoc(BaseDoc):
    """YAML configuration format."""

    updater: SensibleYAML

    @lru_cache()
    def load(self) -> bool:
        """Load a YAML file by its path, a string or a dict."""
        self.updater = SensibleYAML()

        if self.path is not None:
            self._string = Path(self.path).read_text(encoding="UTF-8")
        if self._string is not None:
            self._object = self.updater.loads(self._string)
        if self._object is not None:
            self._reformatted = self.updater.dumps(self._object)
        return True


# Classes and their representation on ruamel.yaml
for dict_class in (SortedDict, items.Table, items.InlineTable):
    RoundTripRepresenter.add_representer(dict_class, RoundTripRepresenter.represent_dict)
RoundTripRepresenter.add_representer(items.String, RoundTripRepresenter.represent_str)
for list_class in (items.Array, items.AoT):
    RoundTripRepresenter.add_representer(list_class, RoundTripRepresenter.represent_list)
RoundTripRepresenter.add_representer(items.Integer, RoundTripRepresenter.represent_int)


def is_scalar(value: YamlValue) -> bool:
    """Return True if the value is NOT a dict or a list."""
    return not isinstance(value, (list, dict))


def replace_or_add_list_element(yaml_obj: YamlObject, element: Any, key: str, index: int) -> None:
    """Replace or add a new element in a YAML sequence of mappings."""
    current = yaml_obj
    if key in yaml_obj:
        current = yaml_obj[key]

    insert: bool = index >= len(current)
    if insert:
        current.append(element)
        return

    if is_scalar(current[index]) or is_scalar(element):
        # If the original object is scalar, replace it with whatever element;
        # without traversing, even if it's a dict
        current[index] = element
        return
    if isinstance(element, dict):
        traverse_yaml_tree(current[index], element)
        return

    # At this point, value is probably a list. Set the whole list in YAML.
    current[index] = element
    return


def traverse_yaml_tree(yaml_obj: YamlObject, change: JsonDict):
    """Traverse a YAML document recursively and change values, keeping its formatting and comments."""
    for key, value in change.items():
        if key not in yaml_obj:
            if isinstance(yaml_obj, dict):
                yaml_obj[key] = value
            else:
                # Key doesn't exist: we can insert the whole nested dict at once, no regrets
                last_pos = len(yaml_obj.keys()) + 1
                yaml_obj.insert(last_pos, key, value)
            continue

        if isinstance(value, dict):
            traverse_yaml_tree(yaml_obj[key], value)
        elif isinstance(value, list):
            for index, element in enumerate(value):
                replace_or_add_list_element(yaml_obj, element, key, index)
        else:
            yaml_obj[key] = value


class JsonDoc(BaseDoc):
    """JSON configuration format."""

    @lru_cache()
    def load(self) -> bool:
        """Load a JSON file by its path, a string or a dict."""
        if self.path is not None:
            self._string = Path(self.path).read_text(encoding="UTF-8")
        if self._string is not None:
            self._object = flatten_quotes(json.loads(self._string))
        if self._object is not None:
            # Every file should end with a blank line
            self._reformatted = json.dumps(self._object, sort_keys=True, indent=2) + "\n"
        return True

andreoliwa / nitpick / 2048374408

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