# Source code for fontTools.pens.svgPathPen

    from typing import Callable
    from fontTools.pens.basePen import BasePen

    def pointToString(pt, ntos=str):
        return " ".join(ntos(i) for i in pt)

    class SVGPathPen(BasePen):
        """ Pen to draw SVG path d commands.

        Example::
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((0, 0))
            >>> pen.lineTo((1, 1))
            >>> pen.curveTo((2, 2), (3, 3), (4, 4))
            >>> pen.closePath()
            >>> pen.getCommands()
            'M0 0 1 1C2 2 3 3 4 4Z'

        Args:
            glyphSet: a dictionary of drawable glyph objects keyed by name
                used to resolve component references in composite glyphs.
            ntos: a callable that takes a number and returns a string, to
                customize how numbers are formatted (default: str).

        Note:
            Fonts have a coordinate system where Y grows up, whereas in SVG,
            Y grows down.  As such, rendering path data from this pen in
            SVG typically results in upside-down glyphs.  You can fix this
            by wrapping the data from this pen in an SVG group element with
            transform, or wrap this pen in a transform pen.  For example:

                spen = svgPathPen.SVGPathPen(glyphset)
                pen= TransformPen(spen , (1, 0, 0, -1, 0, 0))
                glyphset[glyphname].draw(pen)
                print(tpen.getCommands())
        """
        def __init__(self, glyphSet, ntos: Callable[[float], str] = str):
            BasePen.__init__(self, glyphSet)
            self._commands = []
            self._lastCommand = None
            self._lastX = None
            self._lastY = None
            self._ntos = ntos

        def _handleAnchor(self):
            """
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((0, 0))
            >>> pen.moveTo((10, 10))
            >>> pen._commands
            ['M10 10']
            """
            if self._lastCommand == "M":
                self._commands.pop(-1)

        def _moveTo(self, pt):
            """
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((0, 0))
            >>> pen._commands
            ['M0 0']

            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((10, 0))
            >>> pen._commands
            ['M10 0']

            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((0, 10))
            >>> pen._commands
            ['M0 10']
            """
            self._handleAnchor()
            t = "M%s" % (pointToString(pt, self._ntos))
            self._commands.append(t)
            self._lastCommand = "M"
            self._lastX, self._lastY = pt

        def _lineTo(self, pt):
            """
            # duplicate point
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((10, 10))
            >>> pen.lineTo((10, 10))
            >>> pen._commands
            ['M10 10']

            # vertical line
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((10, 10))
            >>> pen.lineTo((10, 0))
            >>> pen._commands
            ['M10 10', 'V0']

            # horizontal line
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((10, 10))
            >>> pen.lineTo((0, 10))
            >>> pen._commands
            ['M10 10', 'H0']

            # basic
            >>> pen = SVGPathPen(None)
            >>> pen.lineTo((70, 80))
            >>> pen._commands
            ['L70 80']

            # basic following a moveto
            >>> pen = SVGPathPen(None)
            >>> pen.moveTo((0, 0))
            >>> pen.lineTo((10, 10))
            >>> pen._commands
            ['M0 0', ' 10 10']
            """
            x, y = pt
            # duplicate point
            if x == self._lastX and y == self._lastY:
                return
            # vertical line
            elif x == self._lastX:
                cmd = "V"
                pts = self._ntos(y)
            # horizontal line
            elif y == self._lastY:
                cmd = "H"
                pts = self._ntos(x)
            # previous was a moveto
            elif self._lastCommand == "M":
                cmd = None
                pts = " " + pointToString(pt, self._ntos)
            # basic
            else:
                cmd = "L"
                pts = pointToString(pt, self._ntos)
            # write the string
            t = ""
            if cmd:
                t += cmd
                self._lastCommand = cmd
            t += pts
            self._commands.append(t)
            # store for future reference
            self._lastX, self._lastY = pt

        def _curveToOne(self, pt1, pt2, pt3):
            """
            >>> pen = SVGPathPen(None)
            >>> pen.curveTo((10, 20), (30, 40), (50, 60))
            >>> pen._commands
            ['C10 20 30 40 50 60']
            """
            t = "C"
            t += pointToString(pt1, self._ntos) + " "
            t += pointToString(pt2, self._ntos) + " "
            t += pointToString(pt3, self._ntos)
            self._commands.append(t)
            self._lastCommand = "C"
            self._lastX, self._lastY = pt3

        def _qCurveToOne(self, pt1, pt2):
            """
            >>> pen = SVGPathPen(None)
            >>> pen.qCurveTo((10, 20), (30, 40))
            >>> pen._commands
            ['Q10 20 30 40']
            >>> from fontTools.misc.roundTools import otRound
            >>> pen = SVGPathPen(None, ntos=lambda v: str(otRound(v)))
            >>> pen.qCurveTo((3, 3), (7, 5), (11, 4))
            >>> pen._commands
            ['Q3 3 5 4', 'Q7 5 11 4']
            """
            assert pt2 is not None
            t = "Q"
            t += pointToString(pt1, self._ntos) + " "
            t += pointToString(pt2, self._ntos)
            self._commands.append(t)
            self._lastCommand = "Q"
            self._lastX, self._lastY = pt2

        def _closePath(self):
            """
            >>> pen = SVGPathPen(None)
            >>> pen.closePath()
            >>> pen._commands
            ['Z']
            """
            self._commands.append("Z")
            self._lastCommand = "Z"
            self._lastX = self._lastY = None

        def _endPath(self):
            """
            >>> pen = SVGPathPen(None)
            >>> pen.endPath()
            >>> pen._commands
            ['Z']
            """
            self._closePath()
            self._lastCommand = None
            self._lastX = self._lastY = None

        def getCommands(self):
            return "".join(self._commands)

    def main(args=None):
        """Generate per-character SVG from font and text"""

        if args is None:
            import sys
            args = sys.argv[1:]

        from fontTools.ttLib import TTFont
        import argparse

        parser = argparse.ArgumentParser(
            "fonttools pens.svgPathPen", description="Generate SVG from text")
        parser.add_argument(
            "font", metavar="font.ttf", help="Font file.")
        parser.add_argument(
            "text", metavar="text", help="Text string.")
        parser.add_argument(
            "--variations", metavar="AXIS=LOC", default='',
            help="List of space separated locations. A location consist in "
            "the name of a variation axis, followed by '=' and a number. E.g.: "
            "wght=700 wdth=80. The default is the location of the base master.")

        options = parser.parse_args(args)

        font = TTFont(options.font)
        text = options.text

        location = {}
        for tag_v in options.variations.split():
            fields = tag_v.split('=')
            tag = fields[0].strip()
            v = int(fields[1])
            location[tag] = v

        hhea = font['hhea']
        ascent, descent = hhea.ascent, hhea.descent

        glyphset = font.getGlyphSet(location=location)
        cmap = font['cmap'].getBestCmap()

        s = ''
        width = 0
        for u in text:
            g = cmap[ord(u)]
            glyph = glyphset[g]

            pen = SVGPathPen(glyphset)
            glyph.draw(pen)
            commands = pen.getCommands()

            s += '<g transform="translate(%d %d) scale(1 -1)"><path d="%s"/></g>\n' % (width, ascent, commands)

            width += glyph.width

        print('<?xml version="1.0" encoding="UTF-8"?>')
        print('<svg width="%d" height="%d" xmlns="http://www.w3.org/2000/svg">' % (width, ascent-descent))
        print(s, end='')
        print('</svg>')

    if __name__ == "__main__":
        import sys
        if len(sys.argv) == 1:
            import doctest
            sys.exit(doctest.testmod().failed)

        sys.exit(main())