Function _format_traceback_lines

IPython/core/tbtools.py:75–127

Format tracebacks lines with pointing arrow, leading numbers, this assumes the stack have been extracted using stackdata. Parameters ---------- lines : list[Line]

(
    lines: list[stack_data.Line],
    theme: Theme,
    has_colors: bool,
    lvals_toks: list[TokenStream],
)

def _format_traceback_lines(
    lines: list[stack_data.Line],
    theme: Theme,
    has_colors: bool,
    lvals_toks: list[TokenStream],
) -> TokenStream:
    """
    Format tracebacks lines with pointing arrow, leading numbers,
    this assumes the stack have been extracted using stackdata.


    Parameters
    ----------
    lines : list[Line]
    """
    numbers_width = INDENT_SIZE - 1
    tokens: TokenStream = []

    for stack_line in lines:
        if stack_line is stack_data.LINE_GAP:
            toks = [(Token.LinenoEm, "   (...)")]
            tokens.extend(toks)
            continue

        lineno = stack_line.lineno
        line = stack_line.render(pygmented=has_colors).rstrip("\n") + "\n"
        if stack_line.is_current:
            # This is the line with the error
            pad = numbers_width - len(str(lineno))
            toks = [
                (Token.LinenoEm, theme.make_arrow(pad)),
                (Token.LinenoEm, str(lineno)),
                (Token, " "),
                (Token, line),
            ]
        else:
            num = "%*s" % (numbers_width, lineno)
            toks = [
                (Token.LinenoEm, str(num)),
                (Token, " "),
                (Token, line),
            ]

        tokens.extend(toks)
        if lvals_toks and stack_line.is_current:
            for lv in lvals_toks:
                tokens.append((Token, " " * INDENT_SIZE))
                tokens.extend(lv)
                tokens.append((Token, "\n"))
            # strip the last newline
            tokens = tokens[:-1]

    return tokens


# some internal-use functions