code: def parse_path(
      pathdef, pen, current_pos=(0, 0), arc_class=EllipticalArc
  ):
      """Parse SVG path definition (i.e. "d" attribute of <path> elements)
      and call a 'pen' object's moveTo, lineTo, curveTo, qCurveTo and closePath
      methods.
  
      If 'current_pos' (2-float tuple) is provided, the initial moveTo will
      be relative to that instead being absolute.
  
      If the pen has an "arcTo" method, it is called with the original values
      of the elliptical arc curve commands:
  
          pen.arcTo(rx, ry, rotation, arc_large, arc_sweep, (x, y))
  
      Otherwise, the arcs are approximated by series of cubic Bezier segments
      ("curveTo"), one every 90 degrees.
      """
      # In the SVG specs, initial movetos are absolute, even if
      # specified as 'm'. This is the default behavior here as well.
      # But if you pass in a current_pos variable, the initial moveto
      # will be relative to that current_pos. This is useful.
      current_pos = complex(*current_pos)
  
      elements = list(_tokenize_path(pathdef))
      # Reverse for easy use of .pop()
      elements.reverse()
  
      start_pos = None
      command = None
      last_control = None
  
      have_arcTo = hasattr(pen, "arcTo")
  
      while elements:
          if elements[-1] in COMMANDS:
              # New command.
              last_command = command  # Used by S and T
              command = elements.pop()
              absolute = command in UPPERCASE
              command = command.upper()
          else:
              # If this element starts with numbers, it is an implicit command
              # and we don't change the command. Check that it's allowed:
              if command is None:
                  raise ValueError(
                      "Unallowed implicit command in %s, position %s"
                      % (pathdef, len(pathdef.split()) - len(elements))
                  )
              last_command = command  # Used by S and T
  
          if command == "M":
              # Moveto command.
              x = elements.pop()
              y = elements.pop()
              pos = float(x) + float(y) * 1j
              if absolute:
                  current_pos = pos
              else:
                  current_pos += pos
  
              # M is not preceded by Z; it's an open subpath
              if start_pos is not None:
                  pen.endPath()
  
              pen.moveTo((current_pos.real, current_pos.imag))
  
              # when M is called, reset start_pos
              # This behavior of Z is defined in svg spec:
              # http://www.w3.org/TR/SVG/paths.html#PathDataClosePathCommand
              start_pos = current_pos
  
              # Implicit moveto commands are treated as lineto commands.
              # So we set command to lineto here, in case there are
              # further implicit commands after this moveto.
              command = "L"
  
          elif command == "Z":
              # Close path
              if current_pos != start_pos:
                  pen.lineTo((start_pos.real, start_pos.imag))
              pen.closePath()
              current_pos = start_pos
              start_pos = None
              command = None  # You can't have implicit commands after closing.
  
          elif command == "L":
              x = elements.pop()
              y = elements.pop()
              pos = float(x) + float(y) * 1j
              if not absolute:
                  pos += current_pos
              pen.lineTo((pos.real, pos.imag))
              current_pos = pos
  
          elif command == "H":
              x = elements.pop()
              pos = float(x) + current_pos.imag * 1j
              if not absolute:
                  pos += current_pos.real
              pen.lineTo((pos.real, pos.imag))
              current_pos = pos
  
          elif command == "V":
              y = elements.pop()
              pos = current_pos.real + float(y) * 1j
              if not absolute:
                  pos += current_pos.imag * 1j
              pen.lineTo((pos.real, pos.imag))
              current_pos = pos
  
          elif command == "C":
              control1 = (
                  float(elements.pop()) + float(elements.pop()) * 1j
              )
              control2 = (
                  float(elements.pop()) + float(elements.pop()) * 1j
              )
              end = float(elements.pop()) + float(elements.pop()) * 1j
  
              if not absolute:
                  control1 += current_pos
                  control2 += current_pos
                  end += current_pos
  
              pen.curveTo(
                  (control1.real, control1.imag),
                  (control2.real, control2.imag),
                  (end.real, end.imag),
              )
              current_pos = end
              last_control = control2
  
          elif command == "S":
              # Smooth curve. First control point is the "reflection" of
              # the second control point in the previous path.
  
              if last_command not in "CS":
                  # If there is no previous command or if the previous command
                  # was not an C, c, S or s, assume the first control point is
                  # coincident with the current point.
                  control1 = current_pos
              else:
                  # The first control point is assumed to be the reflection of
                  # the second control point on the previous command relative
                  # to the current point.
                  control1 = current_pos + current_pos - last_control
  
              control2 = (
                  float(elements.pop()) + float(elements.pop()) * 1j
              )
              end = float(elements.pop()) + float(elements.pop()) * 1j
  
              if not absolute:
                  control2 += current_pos
                  end += current_pos
  
              pen.curveTo(
                  (control1.real, control1.imag),
                  (control2.real, control2.imag),
                  (end.real, end.imag),
              )
              current_pos = end
              last_control = control2
  
          elif command == "Q":
              control = (
                  float(elements.pop()) + float(elements.pop()) * 1j
              )
              end = float(elements.pop()) + float(elements.pop()) * 1j
  
              if not absolute:
                  control += current_pos
                  end += current_pos
  
              pen.qCurveTo(
                  (control.real, control.imag), (end.real, end.imag)
              )
              current_pos = end
              last_control = control
  
          elif command == "T":
              # Smooth curve. Control point is the "reflection" of
              # the second control point in the previous path.
  
              if last_command not in "QT":
                  # If there is no previous command or if the previous command
                  # was not an Q, q, T or t, assume the first control point is
                  # coincident with the current point.
                  control = current_pos
              else:
                  # The control point is assumed to be the reflection of
                  # the control point on the previous command relative
                  # to the current point.
                  control = current_pos + current_pos - last_control
  
              end = float(elements.pop()) + float(elements.pop()) * 1j
  
              if not absolute:
                  end += current_pos
  
              pen.qCurveTo(
                  (control.real, control.imag), (end.real, end.imag)
              )
              current_pos = end
              last_control = control
  
          elif command == "A":
              rx = abs(float(elements.pop()))
              ry = abs(float(elements.pop()))
              rotation = float(elements.pop())
              arc_large = bool(int(elements.pop()))
              arc_sweep = bool(int(elements.pop()))
              end = float(elements.pop()) + float(elements.pop()) * 1j
  
              if not absolute:
                  end += current_pos
  
              # if the pen supports arcs, pass the values unchanged, otherwise
              # approximate the arc with a series of cubic bezier curves
              if have_arcTo:
                  pen.arcTo(
                      rx,
                      ry,
                      rotation,
                      arc_large,
                      arc_sweep,
                      (end.real, end.imag),
                  )
              else:
                  arc = arc_class(
                      current_pos,
                      rx,
                      ry,
                      rotation,
                      arc_large,
                      arc_sweep,
                      end,
                  )
                  arc.draw(pen)
  
              current_pos = end
  
      # no final Z command, it's an open path
      if start_pos is not None:
          pen.endPath()
  
imports: from .arc import EllipticalArc
  import re
label_desc: Use image node_id 3 for calling a global function with example usage: parse_path(pathdef, pen, current_pos, arc_class) without return types