def render(self, size, focus=False):
        from pudb.debugger import CONFIG
        render_line_nr = CONFIG["line_numbers"]

        maxcol = size[0]
        hscroll = self.dbg_ui.source_hscroll_start

        # attrs is a list of words like 'focused' and 'breakpoint'
        attrs = []

        if self.is_current:
            crnt = ">"
            attrs.append("current")
        else:
            crnt = " "

        if self.has_breakpoint:
            bp = "*"
            attrs.append("breakpoint")
        else:
            bp = " "

        if focus:
            attrs.append("focused")
        elif self.highlight:
            if not self.has_breakpoint:
                attrs.append("highlighted")

        text = self.text
        if not attrs and self.attr is not None:
            attr = self.attr + [("source", None)]
        else:
            attr = [(" ".join(attrs+["source"]), None)]

        from urwid.util import apply_target_encoding, trim_text_attr_cs

        # build line prefix ---------------------------------------------------
        line_prefix = ""
        line_prefix_attr = []

        if render_line_nr:
            line_prefix_attr = [("line number", len(self.line_nr))]
            line_prefix = self.line_nr

        line_prefix = crnt+bp+line_prefix
        line_prefix_attr = [("source", 1), ("breakpoint marker", 1)] \
                + line_prefix_attr

        # assume rendered width is same as len
        line_prefix_len = len(line_prefix)

        encoded_line_prefix, line_prefix_cs = apply_target_encoding(line_prefix)

        assert len(encoded_line_prefix) == len(line_prefix)
        # otherwise we'd have to adjust line_prefix_attr... :/

        # shipout, encoding ---------------------------------------------------
        cs = []
        encoded_text_segs = []
        encoded_attr = []

        i = 0
        for seg_attr, seg_len in attr:
            if seg_len is None:
                # means: gobble up remainder of text and rest of line
                # and fill with attribute

                l = hscroll+maxcol
                remaining_text = text[i:]
                encoded_seg_text, seg_cs = apply_target_encoding(
                        remaining_text + l*" ")
                encoded_attr.append((seg_attr, len(remaining_text)+l))
            else:
                unencoded_seg_text = text[i:i+seg_len]
                encoded_seg_text, seg_cs = apply_target_encoding(unencoded_seg_text)

                adjustment = len(encoded_seg_text) - len(unencoded_seg_text)

                encoded_attr.append((seg_attr, seg_len + adjustment))

                i += seg_len

            encoded_text_segs.append(encoded_seg_text)
            cs.extend(seg_cs)

        encoded_text = b"".join(encoded_text_segs)
        encoded_text, encoded_attr, cs = trim_text_attr_cs(
                encoded_text, encoded_attr, cs,
                hscroll, hscroll+maxcol-line_prefix_len)

        encoded_text = encoded_line_prefix + encoded_text
        encoded_attr = line_prefix_attr + encoded_attr
        cs = line_prefix_cs + cs

        return urwid.TextCanvas([encoded_text], [encoded_attr], [cs], maxcol=maxcol)
dataset/ETHPy150Open inducer/pudb/pudb/source_view.py/SourceLine.render/original