Function _simple_format_traceback_lines

IPython/core/tbtools.py:220–281

Format tracebacks lines with pointing arrow, leading numbers This should be equivalent to _format_traceback_lines, but does not rely on stackdata to format the lines This is due to the fact that stackdata may be slow on super long and complex files. Parameters ==========

(
    lnum: int,
    index: int,
    lines: list[tuple[str, tuple[str, bool]]],
    lvals_toks: list[TokenStream],
    theme: Theme,
)

def _simple_format_traceback_lines(
    lnum: int,
    index: int,
    lines: list[tuple[str, tuple[str, bool]]],
    lvals_toks: list[TokenStream],
    theme: Theme,
) -> TokenStream:
    """
    Format tracebacks lines with pointing arrow, leading numbers

    This should be equivalent to _format_traceback_lines, but does not rely on stackdata
    to format the lines

    This is due to the fact that stackdata may be slow on super long and complex files.

    Parameters
    ==========

    lnum: int
        number of the target line of code.
    index: int
        which line in the list should be highlighted.
    lines: list[string]
    lvals_toks: pairs of token type and str
        Values of local variables, already colored, to inject just after the error line.
    """
    for item in lvals_toks:
        assert isinstance(item, list)
        for subit in item:
            assert isinstance(subit[1], str)

    numbers_width = INDENT_SIZE - 1
    res_toks: TokenStream = []
    for i, (line, (new_line, err)) in enumerate(lines, lnum - index):
        if not err:
            line = new_line

        colored_line = line
        if i == lnum:
            # This is the line with the error
            pad = numbers_width - len(str(i))
            line_toks = [
                (Token.LinenoEm, theme.make_arrow(pad)),
                (Token.LinenoEm, str(lnum)),
                (Token, " "),
                (Token, colored_line),
            ]
        else:
            padding_num = "%*s" % (numbers_width, i)

            line_toks = [
                (Token.LinenoEm, padding_num),
                (Token, " "),
                (Token, colored_line),
            ]
        res_toks.extend(line_toks)

        if lvals_toks and i == lnum: