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venv/lib/python3.12/site-packages/fontTools/svgLib/path/__init__.py

@@ -0,0 +1,65 @@
+from fontTools.pens.transformPen import TransformPen
+from fontTools.misc import etree
+from fontTools.misc.textTools import tostr
+from .parser import parse_path
+from .shapes import PathBuilder
+
+
+__all__ = [tostr(s) for s in ("SVGPath", "parse_path")]
+
+
+class SVGPath(object):
+    """Parse SVG ``path`` elements from a file or string, and draw them
+    onto a glyph object that supports the FontTools Pen protocol.
+
+    For example, reading from an SVG file and drawing to a Defcon Glyph:
+
+    .. code-block::
+
+        import defcon
+        glyph = defcon.Glyph()
+        pen = glyph.getPen()
+        svg = SVGPath("path/to/a.svg")
+        svg.draw(pen)
+
+    Or reading from a string containing SVG data, using the alternative
+    'fromstring' (a class method):
+
+    .. code-block::
+
+        data = '<?xml version="1.0" ...'
+        svg = SVGPath.fromstring(data)
+        svg.draw(pen)
+
+    Both constructors can optionally take a 'transform' matrix (6-float
+    tuple, or a FontTools Transform object) to modify the draw output.
+    """
+
+    def __init__(self, filename=None, transform=None):
+        if filename is None:
+            self.root = etree.ElementTree()
+        else:
+            tree = etree.parse(filename)
+            self.root = tree.getroot()
+        self.transform = transform
+
+    @classmethod
+    def fromstring(cls, data, transform=None):
+        self = cls(transform=transform)
+        self.root = etree.fromstring(data)
+        return self
+
+    def draw(self, pen):
+        if self.transform:
+            pen = TransformPen(pen, self.transform)
+        pb = PathBuilder()
+        # xpath | doesn't seem to reliable work so just walk it
+        for el in self.root.iter():
+            pb.add_path_from_element(el)
+        original_pen = pen
+        for path, transform in zip(pb.paths, pb.transforms):
+            if transform:
+                pen = TransformPen(original_pen, transform)
+            else:
+                pen = original_pen
+            parse_path(path, pen)

venv/lib/python3.12/site-packages/fontTools/svgLib/path/arc.py

@@ -0,0 +1,154 @@
+"""Convert SVG Path's elliptical arcs to Bezier curves.
+
+The code is mostly adapted from Blink's SVGPathNormalizer::DecomposeArcToCubic
+https://github.com/chromium/chromium/blob/93831f2/third_party/
+blink/renderer/core/svg/svg_path_parser.cc#L169-L278
+"""
+
+from fontTools.misc.transform import Identity, Scale
+from math import atan2, ceil, cos, fabs, isfinite, pi, radians, sin, sqrt, tan
+
+
+TWO_PI = 2 * pi
+PI_OVER_TWO = 0.5 * pi
+
+
+def _map_point(matrix, pt):
+    # apply Transform matrix to a point represented as a complex number
+    r = matrix.transformPoint((pt.real, pt.imag))
+    return r[0] + r[1] * 1j
+
+
+class EllipticalArc(object):
+    def __init__(self, current_point, rx, ry, rotation, large, sweep, target_point):
+        self.current_point = current_point
+        self.rx = rx
+        self.ry = ry
+        self.rotation = rotation
+        self.large = large
+        self.sweep = sweep
+        self.target_point = target_point
+
+        # SVG arc's rotation angle is expressed in degrees, whereas Transform.rotate
+        # uses radians
+        self.angle = radians(rotation)
+
+        # these derived attributes are computed by the _parametrize method
+        self.center_point = self.theta1 = self.theta2 = self.theta_arc = None
+
+    def _parametrize(self):
+        # convert from endopoint to center parametrization:
+        # https://www.w3.org/TR/SVG/implnote.html#ArcConversionEndpointToCenter
+
+        # If rx = 0 or ry = 0 then this arc is treated as a straight line segment (a
+        # "lineto") joining the endpoints.
+        # http://www.w3.org/TR/SVG/implnote.html#ArcOutOfRangeParameters
+        rx = fabs(self.rx)
+        ry = fabs(self.ry)
+        if not (rx and ry):
+            return False
+
+        # If the current point and target point for the arc are identical, it should
+        # be treated as a zero length path. This ensures continuity in animations.
+        if self.target_point == self.current_point:
+            return False
+
+        mid_point_distance = (self.current_point - self.target_point) * 0.5
+
+        point_transform = Identity.rotate(-self.angle)
+
+        transformed_mid_point = _map_point(point_transform, mid_point_distance)
+        square_rx = rx * rx
+        square_ry = ry * ry
+        square_x = transformed_mid_point.real * transformed_mid_point.real
+        square_y = transformed_mid_point.imag * transformed_mid_point.imag
+
+        # Check if the radii are big enough to draw the arc, scale radii if not.
+        # http://www.w3.org/TR/SVG/implnote.html#ArcCorrectionOutOfRangeRadii
+        radii_scale = square_x / square_rx + square_y / square_ry
+        if radii_scale > 1:
+            rx *= sqrt(radii_scale)
+            ry *= sqrt(radii_scale)
+            self.rx, self.ry = rx, ry
+
+        point_transform = Scale(1 / rx, 1 / ry).rotate(-self.angle)
+
+        point1 = _map_point(point_transform, self.current_point)
+        point2 = _map_point(point_transform, self.target_point)
+        delta = point2 - point1
+
+        d = delta.real * delta.real + delta.imag * delta.imag
+        scale_factor_squared = max(1 / d - 0.25, 0.0)
+
+        scale_factor = sqrt(scale_factor_squared)
+        if self.sweep == self.large:
+            scale_factor = -scale_factor
+
+        delta *= scale_factor
+        center_point = (point1 + point2) * 0.5
+        center_point += complex(-delta.imag, delta.real)
+        point1 -= center_point
+        point2 -= center_point
+
+        theta1 = atan2(point1.imag, point1.real)
+        theta2 = atan2(point2.imag, point2.real)
+
+        theta_arc = theta2 - theta1
+        if theta_arc < 0 and self.sweep:
+            theta_arc += TWO_PI
+        elif theta_arc > 0 and not self.sweep:
+            theta_arc -= TWO_PI
+
+        self.theta1 = theta1
+        self.theta2 = theta1 + theta_arc
+        self.theta_arc = theta_arc
+        self.center_point = center_point
+
+        return True
+
+    def _decompose_to_cubic_curves(self):
+        if self.center_point is None and not self._parametrize():
+            return
+
+        point_transform = Identity.rotate(self.angle).scale(self.rx, self.ry)
+
+        # Some results of atan2 on some platform implementations are not exact
+        # enough. So that we get more cubic curves than expected here. Adding 0.001f
+        # reduces the count of sgements to the correct count.
+        num_segments = int(ceil(fabs(self.theta_arc / (PI_OVER_TWO + 0.001))))
+        for i in range(num_segments):
+            start_theta = self.theta1 + i * self.theta_arc / num_segments
+            end_theta = self.theta1 + (i + 1) * self.theta_arc / num_segments
+
+            t = (4 / 3) * tan(0.25 * (end_theta - start_theta))
+            if not isfinite(t):
+                return
+
+            sin_start_theta = sin(start_theta)
+            cos_start_theta = cos(start_theta)
+            sin_end_theta = sin(end_theta)
+            cos_end_theta = cos(end_theta)
+
+            point1 = complex(
+                cos_start_theta - t * sin_start_theta,
+                sin_start_theta + t * cos_start_theta,
+            )
+            point1 += self.center_point
+            target_point = complex(cos_end_theta, sin_end_theta)
+            target_point += self.center_point
+            point2 = target_point
+            point2 += complex(t * sin_end_theta, -t * cos_end_theta)
+
+            point1 = _map_point(point_transform, point1)
+            point2 = _map_point(point_transform, point2)
+            target_point = _map_point(point_transform, target_point)
+
+            yield point1, point2, target_point
+
+    def draw(self, pen):
+        for point1, point2, target_point in self._decompose_to_cubic_curves():
+            pen.curveTo(
+                (point1.real, point1.imag),
+                (point2.real, point2.imag),
+                (target_point.real, target_point.imag),
+            )

venv/lib/python3.12/site-packages/fontTools/svgLib/path/parser.py

@@ -0,0 +1,322 @@
+# SVG Path specification parser.
+# This is an adaptation from 'svg.path' by Lennart Regebro (@regebro),
+# modified so that the parser takes a FontTools Pen object instead of
+# returning a list of svg.path Path objects.
+# The original code can be found at:
+# https://github.com/regebro/svg.path/blob/4f9b6e3/src/svg/path/parser.py
+# Copyright (c) 2013-2014 Lennart Regebro
+# License: MIT
+
+from .arc import EllipticalArc
+import re
+
+
+COMMANDS = set("MmZzLlHhVvCcSsQqTtAa")
+ARC_COMMANDS = set("Aa")
+UPPERCASE = set("MZLHVCSQTA")
+
+COMMAND_RE = re.compile("([MmZzLlHhVvCcSsQqTtAa])")
+
+# https://www.w3.org/TR/css-syntax-3/#number-token-diagram
+#   but -6.e-5 will be tokenized as "-6" then "-5" and confuse parsing
+FLOAT_RE = re.compile(
+    r"[-+]?"  # optional sign
+    r"(?:"
+    r"(?:0|[1-9][0-9]*)(?:\.[0-9]+)?(?:[eE][-+]?[0-9]+)?"  # int/float
+    r"|"
+    r"(?:\.[0-9]+(?:[eE][-+]?[0-9]+)?)"  # float with leading dot (e.g. '.42')
+    r")"
+)
+BOOL_RE = re.compile("^[01]")
+SEPARATOR_RE = re.compile(f"[, \t]")
+
+
+def _tokenize_path(pathdef):
+    arc_cmd = None
+    for x in COMMAND_RE.split(pathdef):
+        if x in COMMANDS:
+            arc_cmd = x if x in ARC_COMMANDS else None
+            yield x
+            continue
+
+        if arc_cmd:
+            try:
+                yield from _tokenize_arc_arguments(x)
+            except ValueError as e:
+                raise ValueError(f"Invalid arc command: '{arc_cmd}{x}'") from e
+        else:
+            for token in FLOAT_RE.findall(x):
+                yield token
+
+
+ARC_ARGUMENT_TYPES = (
+    ("rx", FLOAT_RE),
+    ("ry", FLOAT_RE),
+    ("x-axis-rotation", FLOAT_RE),
+    ("large-arc-flag", BOOL_RE),
+    ("sweep-flag", BOOL_RE),
+    ("x", FLOAT_RE),
+    ("y", FLOAT_RE),
+)
+
+
+def _tokenize_arc_arguments(arcdef):
+    raw_args = [s for s in SEPARATOR_RE.split(arcdef) if s]
+    if not raw_args:
+        raise ValueError(f"Not enough arguments: '{arcdef}'")
+    raw_args.reverse()
+
+    i = 0
+    while raw_args:
+        arg = raw_args.pop()
+
+        name, pattern = ARC_ARGUMENT_TYPES[i]
+        match = pattern.search(arg)
+        if not match:
+            raise ValueError(f"Invalid argument for '{name}' parameter: {arg!r}")
+
+        j, k = match.span()
+        yield arg[j:k]
+        arg = arg[k:]
+
+        if arg:
+            raw_args.append(arg)
+
+        # wrap around every 7 consecutive arguments
+        if i == 6:
+            i = 0
+        else:
+            i += 1
+
+    if i != 0:
+        raise ValueError(f"Not enough arguments: '{arcdef}'")
+
+
+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:
+
+    .. code-block::
+
+        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()

venv/lib/python3.12/site-packages/fontTools/svgLib/path/shapes.py

@@ -0,0 +1,183 @@
+import re
+
+
+def _prefer_non_zero(*args):
+    for arg in args:
+        if arg != 0:
+            return arg
+    return 0.0
+
+
+def _ntos(n):
+    # %f likes to add unnecessary 0's, %g isn't consistent about # decimals
+    return ("%.3f" % n).rstrip("0").rstrip(".")
+
+
+def _strip_xml_ns(tag):
+    # ElementTree API doesn't provide a way to ignore XML namespaces in tags
+    # so we here strip them ourselves: cf. https://bugs.python.org/issue18304
+    return tag.split("}", 1)[1] if "}" in tag else tag
+
+
+def _transform(raw_value):
+    # TODO assumes a 'matrix' transform.
+    # No other transform functions are supported at the moment.
+    # https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform
+    # start simple: if you aren't exactly matrix(...) then no love
+    match = re.match(r"matrix\((.*)\)", raw_value)
+    if not match:
+        raise NotImplementedError
+    matrix = tuple(float(p) for p in re.split(r"\s+|,", match.group(1)))
+    if len(matrix) != 6:
+        raise ValueError("wrong # of terms in %s" % raw_value)
+    return matrix
+
+
+class PathBuilder(object):
+    def __init__(self):
+        self.paths = []
+        self.transforms = []
+
+    def _start_path(self, initial_path=""):
+        self.paths.append(initial_path)
+        self.transforms.append(None)
+
+    def _end_path(self):
+        self._add("z")
+
+    def _add(self, path_snippet):
+        path = self.paths[-1]
+        if path:
+            path += " " + path_snippet
+        else:
+            path = path_snippet
+        self.paths[-1] = path
+
+    def _move(self, c, x, y):
+        self._add("%s%s,%s" % (c, _ntos(x), _ntos(y)))
+
+    def M(self, x, y):
+        self._move("M", x, y)
+
+    def m(self, x, y):
+        self._move("m", x, y)
+
+    def _arc(self, c, rx, ry, x, y, large_arc):
+        self._add(
+            "%s%s,%s 0 %d 1 %s,%s"
+            % (c, _ntos(rx), _ntos(ry), large_arc, _ntos(x), _ntos(y))
+        )
+
+    def A(self, rx, ry, x, y, large_arc=0):
+        self._arc("A", rx, ry, x, y, large_arc)
+
+    def a(self, rx, ry, x, y, large_arc=0):
+        self._arc("a", rx, ry, x, y, large_arc)
+
+    def _vhline(self, c, x):
+        self._add("%s%s" % (c, _ntos(x)))
+
+    def H(self, x):
+        self._vhline("H", x)
+
+    def h(self, x):
+        self._vhline("h", x)
+
+    def V(self, y):
+        self._vhline("V", y)
+
+    def v(self, y):
+        self._vhline("v", y)
+
+    def _line(self, c, x, y):
+        self._add("%s%s,%s" % (c, _ntos(x), _ntos(y)))
+
+    def L(self, x, y):
+        self._line("L", x, y)
+
+    def l(self, x, y):
+        self._line("l", x, y)
+
+    def _parse_line(self, line):
+        x1 = float(line.attrib.get("x1", 0))
+        y1 = float(line.attrib.get("y1", 0))
+        x2 = float(line.attrib.get("x2", 0))
+        y2 = float(line.attrib.get("y2", 0))
+
+        self._start_path()
+        self.M(x1, y1)
+        self.L(x2, y2)
+
+    def _parse_rect(self, rect):
+        x = float(rect.attrib.get("x", 0))
+        y = float(rect.attrib.get("y", 0))
+        w = float(rect.attrib.get("width"))
+        h = float(rect.attrib.get("height"))
+        rx = float(rect.attrib.get("rx", 0))
+        ry = float(rect.attrib.get("ry", 0))
+
+        rx = _prefer_non_zero(rx, ry)
+        ry = _prefer_non_zero(ry, rx)
+        # TODO there are more rules for adjusting rx, ry
+
+        self._start_path()
+        self.M(x + rx, y)
+        self.H(x + w - rx)
+        if rx > 0:
+            self.A(rx, ry, x + w, y + ry)
+        self.V(y + h - ry)
+        if rx > 0:
+            self.A(rx, ry, x + w - rx, y + h)
+        self.H(x + rx)
+        if rx > 0:
+            self.A(rx, ry, x, y + h - ry)
+        self.V(y + ry)
+        if rx > 0:
+            self.A(rx, ry, x + rx, y)
+        self._end_path()
+
+    def _parse_path(self, path):
+        if "d" in path.attrib:
+            self._start_path(initial_path=path.attrib["d"])
+
+    def _parse_polygon(self, poly):
+        if "points" in poly.attrib:
+            self._start_path("M" + poly.attrib["points"])
+            self._end_path()
+
+    def _parse_polyline(self, poly):
+        if "points" in poly.attrib:
+            self._start_path("M" + poly.attrib["points"])
+
+    def _parse_circle(self, circle):
+        cx = float(circle.attrib.get("cx", 0))
+        cy = float(circle.attrib.get("cy", 0))
+        r = float(circle.attrib.get("r"))
+
+        # arc doesn't seem to like being a complete shape, draw two halves
+        self._start_path()
+        self.M(cx - r, cy)
+        self.A(r, r, cx + r, cy, large_arc=1)
+        self.A(r, r, cx - r, cy, large_arc=1)
+
+    def _parse_ellipse(self, ellipse):
+        cx = float(ellipse.attrib.get("cx", 0))
+        cy = float(ellipse.attrib.get("cy", 0))
+        rx = float(ellipse.attrib.get("rx"))
+        ry = float(ellipse.attrib.get("ry"))
+
+        # arc doesn't seem to like being a complete shape, draw two halves
+        self._start_path()
+        self.M(cx - rx, cy)
+        self.A(rx, ry, cx + rx, cy, large_arc=1)
+        self.A(rx, ry, cx - rx, cy, large_arc=1)
+
+    def add_path_from_element(self, el):
+        tag = _strip_xml_ns(el.tag)
+        parse_fn = getattr(self, "_parse_%s" % tag.lower(), None)
+        if not callable(parse_fn):
+            return False
+        parse_fn(el)
+        if "transform" in el.attrib:
+            self.transforms[-1] = _transform(el.attrib["transform"])
+        return True