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✏️ Editing: base_writer.py

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt

"""Universal report objects and some formatting drivers.

A way to create simple reports using python objects, primarily designed to be
formatted as text and html.
"""

from __future__ import annotations

import sys
from collections.abc import Iterator
from io import StringIO
from typing import TYPE_CHECKING, TextIO

if TYPE_CHECKING:
    from pylint.reporters.ureports.nodes import (
        BaseLayout,
        EvaluationSection,
        Paragraph,
        Section,
        Table,
    )

class BaseWriter:
    """Base class for ureport writers."""

def format(
        self,
        layout: BaseLayout,
        stream: TextIO = sys.stdout,
        encoding: str | None = None,
    ) -> None:
        """Format and write the given layout into the stream object.

unicode policy: unicode strings may be found in the layout;
        try to call 'stream.write' with it, but give it back encoded using
        the given encoding if it fails
        """
        if not encoding:
            encoding = getattr(stream, "encoding", "UTF-8")
        self.encoding = encoding or "UTF-8"
        self.out = stream
        self.begin_format()
        layout.accept(self)
        self.end_format()

def format_children(self, layout: EvaluationSection | Paragraph | Section) -> None:
        """Recurse on the layout children and call their accept method
        (see the Visitor pattern).
        """
        for child in getattr(layout, "children", ()):
            child.accept(self)

def writeln(self, string: str = "") -> None:
        """Write a line in the output buffer."""
        self.write(string + "\n")

def write(self, string: str) -> None:
        """Write a string in the output buffer."""
        self.out.write(string)

def begin_format(self) -> None:
        """Begin to format a layout."""
        self.section = 0

def end_format(self) -> None:
        """Finished formatting a layout."""

def get_table_content(self, table: Table) -> list[list[str]]:
        """Trick to get table content without actually writing it.

return an aligned list of lists containing table cells values as string
        """
        result: list[list[str]] = [[]]
        cols = table.cols
        for cell in self.compute_content(table):
            if cols == 0:
                result.append([])
                cols = table.cols
            cols -= 1
            result[-1].append(cell)
        # fill missing cells
        result[-1] += [""] * (cols - len(result[-1]))
        return result

def compute_content(self, layout: BaseLayout) -> Iterator[str]:
        """Trick to compute the formatting of children layout before actually
        writing it.

return an iterator on strings (one for each child element)
        """
        # Patch the underlying output stream with a fresh-generated stream,
        # which is used to store a temporary representation of a child
        # node.
        out = self.out
        try:
            for child in layout.children:
                stream = StringIO()
                self.out = stream
                child.accept(self)
                yield stream.getvalue()
        finally:
            self.out = out

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