Method render_html

src/werkzeug/debug/tbtools.py:394–439

(self, mark_library: bool)

        return self.console.eval(code)

    def render_html(self, mark_library: bool) -> str:
        context = 5
        lines = linecache.getlines(self.filename)
        line_idx = self.lineno - 1  # type: ignore[operator]
        start_idx = max(0, line_idx - context)
        stop_idx = min(len(lines), line_idx + context + 1)
        rendered_lines = []

        def render_line(line: str, cls: str) -> None:
            line = line.expandtabs().rstrip()
            stripped_line = line.strip()
            prefix = len(line) - len(stripped_line)
            colno = getattr(self, "colno", 0)
            end_colno = getattr(self, "end_colno", 0)

            if cls == "current" and colno and end_colno:
                arrow = (
                    f'\n<span class="ws">{" " * prefix}</span>'
                    f"{' ' * (colno - prefix)}{'^' * (end_colno - colno)}"
                )
            else:
                arrow = ""

            rendered_lines.append(
                f'<pre class="line {cls}"><span class="ws">{" " * prefix}</span>'
                f"{escape(stripped_line) if stripped_line else ' '}"
                f"{arrow if arrow else ''}</pre>"
            )

        if line_idx < len(lines):
            for line in lines[start_idx:line_idx]:
                render_line(line, "before")

            render_line(lines[line_idx], "current")

            for line in lines[line_idx + 1 : stop_idx]:
                render_line(line, "after")

        return FRAME_HTML % {
            "id": id(self),
            "filename": escape(self.filename),
            "lineno": self.lineno,
            "function_name": escape(self.name),
            "lines": "\n".join(rendered_lines),
            "library": "library" if mark_library and self.is_library else "",
        }


def render_console_html(secret: str, evalex_trusted: bool) -> str: