import_svg.py

    def parse(self):
        """
        Parse XML node to memory
        """

        pass

    def _doCreateGeom(self, instancing):
        """
        Internal handler to create real geometries
        """

        pass

    def getTransformMatrix(self):
        """
        Get matrix created from "transform" attribute
        """

        transform = self._node.getAttribute('transform')

        if transform:
            return SVGParseTransform(transform)

        return None

    def createGeom(self, instancing):
        """
        Create real geometries
        """

        if self._creating:
            return

        self._creating = True

        matrix = self.getTransformMatrix()
        if matrix is not None:
            self._pushMatrix(matrix)

        self._doCreateGeom(instancing)

        if matrix is not None:
            self._popMatrix()

        self._creating = False


class SVGGeometryContainer(SVGGeometry):
    """
    Container of SVG geometries
    """

    __slots__ = ('_geometries',  # List of chold geometries
                 '_styles')  # Styles, used for displaying

    def __init__(self, node, context):
        """
        Initialize SVG geometry container
        """

        super().__init__(node, context)

        self._geometries = []
        self._styles = SVGEmptyStyles

    def parse(self):
        """
        Parse XML node to memory
        """

        if type(self._node) is xml.dom.minidom.Element:
            self._styles = SVGParseStyles(self._node, self._context)

        self._pushStyle(self._styles)

        for node in self._node.childNodes:
            if type(node) is not xml.dom.minidom.Element:
                continue

            ob = parseAbstractNode(node, self._context)
            if ob is not None:
                self._geometries.append(ob)

        self._popStyle()

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        for geom in self._geometries:
            geom.createGeom(instancing)

    def getGeometries(self):
        """
        Get list of parsed geometries
        """

        return self._geometries


class SVGGeometryPATH(SVGGeometry):
    """
    SVG path geometry
    """

    __slots__ = ('_splines',  # List of splines after parsing
                 '_styles')  # Styles, used for displaying

    def __init__(self, node, context):
        """
        Initialize SVG path
        """

        super().__init__(node, context)

        self._splines = []
        self._styles = SVGEmptyStyles

    def parse(self):
        """
        Parse SVG path node
        """

        d = self._node.getAttribute('d')

        self._styles = SVGParseStyles(self._node, self._context)

        pathParser = SVGPathParser(d, self._styles['useFill'])
        pathParser.parse()

        self._splines = pathParser.getSplines()

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        ob = SVGCreateCurve(self._context)
        cu = ob.data

        id_names_from_node(self._node, ob)

        if self._styles['useFill']:
            cu.dimensions = '2D'
            cu.fill_mode = 'BOTH'
            cu.materials.append(self._styles['fill'])
        else:
            cu.dimensions = '3D'

        for spline in self._splines:
            act_spline = None

            if spline['closed'] and len(spline['points']) >= 2:
                first = spline['points'][0]
                last = spline['points'][-1]
                if (    first['handle_left_type'] == 'FREE' and
                        last['handle_right_type'] == 'VECTOR'):
                    last['handle_right_type'] = 'FREE'
                    last['handle_right'] = (last['x'], last['y'])
                if (    last['handle_right_type'] == 'FREE' and
                        first['handle_left_type'] == 'VECTOR'):
                    first['handle_left_type'] = 'FREE'
                    first['handle_left'] = (first['x'], first['y'])

            for point in spline['points']:
                co = self._transformCoord((point['x'], point['y']))

                if act_spline is None:
                    cu.splines.new('BEZIER')

                    act_spline = cu.splines[-1]
                    act_spline.use_cyclic_u = spline['closed']
                else:
                    act_spline.bezier_points.add(1)

                bezt = act_spline.bezier_points[-1]
                bezt.co = co

                bezt.handle_left_type = point['handle_left_type']
                if point['handle_left'] is not None:
                    handle = point['handle_left']
                    bezt.handle_left = self._transformCoord(handle)

                bezt.handle_right_type = point['handle_right_type']
                if point['handle_right'] is not None:
                    handle = point['handle_right']
                    bezt.handle_right = self._transformCoord(handle)

        SVGFinishCurve()


class SVGGeometryDEFS(SVGGeometryContainer):
    """
    Container for referenced elements
    """

    def createGeom(self, instancing):
        """
        Create real geometries
        """

        pass


class SVGGeometrySYMBOL(SVGGeometryContainer):
    """
    Referenced element
    """

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        self._pushMatrix(self.getNodeMatrix())

        super()._doCreateGeom(False)

        self._popMatrix()

    def createGeom(self, instancing):
        """
        Create real geometries
        """

        if not instancing:
            return

        super().createGeom(instancing)


class SVGGeometryG(SVGGeometryContainer):
    """
    Geometry group
    """

    pass


class SVGGeometryUSE(SVGGeometry):
    """
    User of referenced elements
    """

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        ref = self._node.getAttribute('xlink:href')
        geom = self._context['defines'].get(ref)

        if geom is not None:
            rect = SVGRectFromNode(self._node, self._context)
            self._pushRect(rect)

            self._pushMatrix(self.getNodeMatrix())

            geom.createGeom(True)

            self._popMatrix()

            self._popRect()


class SVGGeometryRECT(SVGGeometry):
    """
    SVG rectangle
    """

    __slots__ = ('_rect',  # coordinate and dimensions of rectangle
                 '_radius',  # Rounded corner radiuses
                 '_styles')  # Styles, used for displaying

    def __init__(self, node, context):
        """
        Initialize new rectangle
        """

        super().__init__(node, context)

        self._rect = ('0', '0', '0', '0')
        self._radius = ('0', '0')
        self._styles = SVGEmptyStyles

    def parse(self):
        """
        Parse SVG rectangle node
        """

        self._styles = SVGParseStyles(self._node, self._context)

        rect = []
        for attr in ['x', 'y', 'width', 'height']:
            val = self._node.getAttribute(attr)
            rect.append(val or '0')

        self._rect = (rect)

        rx = self._node.getAttribute('rx')
        ry = self._node.getAttribute('ry')

        self._radius = (rx, ry)

    def _appendCorner(self, spline, coord, firstTime, rounded):
        """
        Append new corner to rectangle
        """

        handle = None
        if len(coord) == 3:
            handle = self._transformCoord(coord[2])
            coord = (coord[0], coord[1])

        co = self._transformCoord(coord)

        if not firstTime:
            spline.bezier_points.add(1)

        bezt = spline.bezier_points[-1]
        bezt.co = co

        if rounded:
            if handle:
                bezt.handle_left_type = 'VECTOR'
                bezt.handle_right_type = 'FREE'

                bezt.handle_right = handle
            else:
                bezt.handle_left_type = 'FREE'
                bezt.handle_right_type = 'VECTOR'
                bezt.handle_left = co

        else:
            bezt.handle_left_type = 'VECTOR'
            bezt.handle_right_type = 'VECTOR'

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        # Run-time parsing -- percents would be correct only if
        # parsing them now
        crect = self._context['rect']
        rect = []

        for i in range(4):
            rect.append(SVGParseCoord(self._rect[i], crect[i % 2]))

        r = self._radius
        rx = ry = 0.0

        if r[0] and r[1]:
            rx = min(SVGParseCoord(r[0], rect[0]), rect[2] / 2)
            ry = min(SVGParseCoord(r[1], rect[1]), rect[3] / 2)
        elif r[0]:
            rx = min(SVGParseCoord(r[0], rect[0]), rect[2] / 2)
            ry = min(rx, rect[3] / 2)
            rx = ry = min(rx, ry)
        elif r[1]:
            ry = min(SVGParseCoord(r[1], rect[1]), rect[3] / 2)
            rx = min(ry, rect[2] / 2)
            rx = ry = min(rx, ry)

        radius = (rx, ry)

        # Geometry creation
        ob = SVGCreateCurve(self._context)
        cu = ob.data

        id_names_from_node(self._node, ob)

        if self._styles['useFill']:
            cu.dimensions = '2D'
            cu.fill_mode = 'BOTH'
            cu.materials.append(self._styles['fill'])
        else:
            cu.dimensions = '3D'

        cu.splines.new('BEZIER')

        spline = cu.splines[-1]
        spline.use_cyclic_u = True

        x, y = rect[0], rect[1]
        w, h = rect[2], rect[3]
        rx, ry = radius[0], radius[1]
        rounded = False

        if rx or ry:
            #
            #      0 _______ 1
            #     /           \
            #    /             \
            #   7               2
            #   |               |
            #   |               |
            #   6               3
            #    \             /
            #     \           /
            #      5 _______ 4
            #

            # Optional third component -- right handle coord
            coords = [(x + rx, y),
                      (x + w - rx, y, (x + w, y)),
                      (x + w, y + ry),
                      (x + w, y + h - ry, (x + w, y + h)),
                      (x + w - rx, y + h),
                      (x + rx, y + h, (x, y + h)),
                      (x, y + h - ry),
                      (x, y + ry, (x, y))]

            rounded = True
        else:
            coords = [(x, y), (x + w, y), (x + w, y + h), (x, y + h)]

        firstTime = True
        for coord in coords:
            self._appendCorner(spline, coord, firstTime, rounded)
            firstTime = False

        SVGFinishCurve()


class SVGGeometryELLIPSE(SVGGeometry):
    """
    SVG ellipse
    """

    __slots__ = ('_cx',  # X-coordinate of center
                 '_cy',  # Y-coordinate of center
                 '_rx',  # X-axis radius of circle
                 '_ry',  # Y-axis radius of circle
                 '_styles')  # Styles, used for displaying

    def __init__(self, node, context):
        """
        Initialize new ellipse
        """

        super().__init__(node, context)

        self._cx = '0.0'
        self._cy = '0.0'
        self._rx = '0.0'
        self._ry = '0.0'
        self._styles = SVGEmptyStyles

    def parse(self):
        """
        Parse SVG ellipse node
        """

        self._styles = SVGParseStyles(self._node, self._context)

        self._cx = self._node.getAttribute('cx') or '0'
        self._cy = self._node.getAttribute('cy') or '0'
        self._rx = self._node.getAttribute('rx') or '0'
        self._ry = self._node.getAttribute('ry') or '0'

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        # Run-time parsing -- percents would be correct only if
        # parsing them now
        crect = self._context['rect']

        cx = SVGParseCoord(self._cx, crect[0])
        cy = SVGParseCoord(self._cy, crect[1])
        rx = SVGParseCoord(self._rx, crect[0])
        ry = SVGParseCoord(self._ry, crect[1])

        if not rx or not ry:
            # Automaic handles will work incorrect in this case
            return

        # Create circle
        ob = SVGCreateCurve(self._context)
        cu = ob.data

        id_names_from_node(self._node, ob)

        if self._styles['useFill']:
            cu.dimensions = '2D'
            cu.fill_mode = 'BOTH'
            cu.materials.append(self._styles['fill'])
        else:
            cu.dimensions = '3D'

        coords = [((cx - rx, cy),
                   (cx - rx, cy + ry * 0.552),
                   (cx - rx, cy - ry * 0.552)),

                  ((cx, cy - ry),
                   (cx - rx * 0.552, cy - ry),
                   (cx + rx * 0.552, cy - ry)),

                  ((cx + rx, cy),
                   (cx + rx, cy - ry * 0.552),
                   (cx + rx, cy + ry * 0.552)),

                  ((cx, cy + ry),
                   (cx + rx * 0.552, cy + ry),
                   (cx - rx * 0.552, cy + ry))]

        spline = None
        for coord in coords:
            co = self._transformCoord(coord[0])
            handle_left = self._transformCoord(coord[1])
            handle_right = self._transformCoord(coord[2])

            if spline is None:
                cu.splines.new('BEZIER')
                spline = cu.splines[-1]
                spline.use_cyclic_u = True
            else:
                spline.bezier_points.add(1)

            bezt = spline.bezier_points[-1]
            bezt.co = co
            bezt.handle_left_type = 'FREE'
            bezt.handle_right_type = 'FREE'
            bezt.handle_left = handle_left
            bezt.handle_right = handle_right

        SVGFinishCurve()


class SVGGeometryCIRCLE(SVGGeometryELLIPSE):
    """
    SVG circle
    """

    def parse(self):
        """
        Parse SVG circle node
        """

        self._styles = SVGParseStyles(self._node, self._context)

        self._cx = self._node.getAttribute('cx') or '0'
        self._cy = self._node.getAttribute('cy') or '0'

        r = self._node.getAttribute('r') or '0'
        self._rx = self._ry = r


class SVGGeometryLINE(SVGGeometry):
    """
    SVG line
    """

    __slots__ = ('_x1',  # X-coordinate of beginning
                 '_y1',  # Y-coordinate of beginning
                 '_x2',  # X-coordinate of ending
                 '_y2')  # Y-coordinate of ending

    def __init__(self, node, context):
        """
        Initialize new line
        """

        super().__init__(node, context)

        self._x1 = '0.0'
        self._y1 = '0.0'
        self._x2 = '0.0'
        self._y2 = '0.0'

    def parse(self):
        """
        Parse SVG line node
        """

        self._x1 = self._node.getAttribute('x1') or '0'
        self._y1 = self._node.getAttribute('y1') or '0'
        self._x2 = self._node.getAttribute('x2') or '0'
        self._y2 = self._node.getAttribute('y2') or '0'

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        # Run-time parsing -- percents would be correct only if
        # parsing them now
        crect = self._context['rect']

        x1 = SVGParseCoord(self._x1, crect[0])
        y1 = SVGParseCoord(self._y1, crect[1])
        x2 = SVGParseCoord(self._x2, crect[0])
        y2 = SVGParseCoord(self._y2, crect[1])

        # Create cline
        ob = SVGCreateCurve(self._context)
        cu = ob.data

        id_names_from_node(self._node, ob)

        coords = [(x1, y1), (x2, y2)]
        spline = None

        for coord in coords:
            co = self._transformCoord(coord)

            if spline is None:
                cu.splines.new('BEZIER')
                spline = cu.splines[-1]
                spline.use_cyclic_u = True
            else:
                spline.bezier_points.add(1)

            bezt = spline.bezier_points[-1]
            bezt.co = co
            bezt.handle_left_type = 'VECTOR'
            bezt.handle_right_type = 'VECTOR'

        SVGFinishCurve()


class SVGGeometryPOLY(SVGGeometry):
    """
    Abstract class for handling poly-geometries
    (polylines and polygons)
    """

    __slots__ = ('_points',  # Array of points for poly geometry
                 '_styles',  # Styles, used for displaying
                 '_closed')  # Should generated curve be closed?

    def __init__(self, node, context):
        """
        Initialize new poly geometry
        """

        super().__init__(node, context)

        self._points = []
        self._styles = SVGEmptyStyles
        self._closed = False

    def parse(self):
        """
        Parse poly node
        """

        self._styles = SVGParseStyles(self._node, self._context)

        points = parse_array_of_floats(self._node.getAttribute('points'))

        prev = None
        self._points = []

        for p in points:
            if prev is None:
                prev = p
            else:
                self._points.append((prev, p))
                prev = None

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        ob = SVGCreateCurve(self._context)
        cu = ob.data

        id_names_from_node(self._node, ob)

        if self._closed and self._styles['useFill']:
            cu.dimensions = '2D'
            cu.fill_mode = 'BOTH'
            cu.materials.append(self._styles['fill'])
        else:
            cu.dimensions = '3D'

        spline = None

        for point in self._points:
            co = self._transformCoord(point)

            if spline is None:
                cu.splines.new('BEZIER')
                spline = cu.splines[-1]
                spline.use_cyclic_u = self._closed
            else:
                spline.bezier_points.add(1)

            bezt = spline.bezier_points[-1]
            bezt.co = co
            bezt.handle_left_type = 'VECTOR'
            bezt.handle_right_type = 'VECTOR'

        SVGFinishCurve()


class SVGGeometryPOLYLINE(SVGGeometryPOLY):
    """
    SVG polyline geometry
    """

    pass


class SVGGeometryPOLYGON(SVGGeometryPOLY):
    """
    SVG polygon geometry
    """

    def __init__(self, node, context):
        """
        Initialize new polygon geometry
        """

        super().__init__(node, context)

        self._closed = True


class SVGGeometrySVG(SVGGeometryContainer):
    """
    Main geometry holder
    """

    def _doCreateGeom(self, instancing):
        """
        Create real geometries
        """

        rect = SVGRectFromNode(self._node, self._context)

        matrix = self.getNodeMatrix()

        # Better SVG compatibility: match svg-document units
        # with blender units

        viewbox = []
        unit = ''

        if self._node.getAttribute('height'):
            raw_height = self._node.getAttribute('height')
            token, last_char = read_float(raw_height)
            document_height = float(token)
            unit = raw_height[last_char:].strip()

        if self._node.getAttribute('viewBox'):
            viewbox = parse_array_of_floats(self._node.getAttribute('viewBox'))

        if len(viewbox) == 4 and unit in ('cm', 'mm', 'in', 'pt', 'pc'):

            #convert units to BU:
            unitscale = units[unit] / 90 * 1000 / 39.3701

            #apply blender unit scale:
            unitscale = unitscale / bpy.context.scene.unit_settings.scale_length

            matrix = matrix @ Matrix.Scale(unitscale, 4, Vector((1.0, 0.0, 0.0)))
            matrix = matrix @ Matrix.Scale(unitscale, 4, Vector((0.0, 1.0, 0.0)))

        # match document origin with 3D space origin.
        if self._node.getAttribute('viewBox'):
            viewbox = parse_array_of_floats(self._node.getAttribute('viewBox'))
            matrix = matrix @ matrix.Translation([0.0, - viewbox[1] - viewbox[3], 0.0])

        self._pushMatrix(matrix)
        self._pushRect(rect)

        super()._doCreateGeom(False)

        self._popRect()
        self._popMatrix()


class SVGLoader(SVGGeometryContainer):
    """
    SVG file loader
    """

    def getTransformMatrix(self):
        """
        Get matrix created from "transform" attribute
        """

        # SVG document doesn't support transform specification
        # it can't even hold attributes

        return None

    def __init__(self, context, filepath, do_colormanage):
        """
        Initialize SVG loader
        """
        import os

        svg_name = os.path.basename(filepath)
        scene = context.scene
        collection = bpy.data.collections.new(name=svg_name)
        scene.collection.children.link(collection)

        node = xml.dom.minidom.parse(filepath)

        m = Matrix()
        m = m @ Matrix.Scale(1.0 / 90.0 * 0.3048 / 12.0, 4, Vector((1.0, 0.0, 0.0)))
        m = m @ Matrix.Scale(-1.0 / 90.0 * 0.3048 / 12.0, 4, Vector((0.0, 1.0, 0.0)))

        rect = (0, 0)

        self._context = {'defines': {},
                         'transform': [],
                         'rects': [rect],
                         'rect': rect,
                         'matrix': m,
                         'materials': {},
                         'styles': [None],
                         'style': None,
                         'do_colormanage': do_colormanage,
                         'collection': collection}

        super().__init__(node, self._context)


svgGeometryClasses = {
    'svg': SVGGeometrySVG,
    'path': SVGGeometryPATH,
    'defs': SVGGeometryDEFS,
    'symbol': SVGGeometrySYMBOL,
    'use': SVGGeometryUSE,
    'rect': SVGGeometryRECT,
    'ellipse': SVGGeometryELLIPSE,
    'circle': SVGGeometryCIRCLE,
    'line': SVGGeometryLINE,
    'polyline': SVGGeometryPOLYLINE,
    'polygon': SVGGeometryPOLYGON,
    'g': SVGGeometryG}


def parseAbstractNode(node, context):
    name = node.tagName.lower()

    if name.startswith('svg:'):
        name = name[4:]

    geomClass = svgGeometryClasses.get(name)

    if geomClass is not None:
        ob = geomClass(node, context)
        ob.parse()

        return ob

    return None


def load_svg(context, filepath, do_colormanage):
    """
    Load specified SVG file
    """

    if bpy.ops.object.mode_set.poll():
        bpy.ops.object.mode_set(mode='OBJECT')

    loader = SVGLoader(context, filepath, do_colormanage)
    loader.parse()
    loader.createGeom(False)


def load(operator, context, filepath=""):

    # error in code should raise exceptions but loading
    # non SVG files can give useful messages.
    do_colormanage = context.scene.display_settings.display_device != 'NONE'
    try:
        load_svg(context, filepath, do_colormanage)
    except (xml.parsers.expat.ExpatError, UnicodeEncodeError) as e:
        import traceback
        traceback.print_exc()

        operator.report({'WARNING'}, "Unable to parse XML, %s:%s for file %r" % (type(e).__name__, e, filepath))
        return {'CANCELLED'}

    return {'FINISHED'}