[svgLib] Add support for polyline element

Lib/fontTools/svgLib/path/shapes.py

@@ -1,5 +1,6 @@
 import re
 
+
 def _prefer_non_zero(*args):
     for arg in args:
         if arg != 0:
@@ -123,6 +124,10 @@ class PathBuilder(object):
             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))

Tests/svgLib/path/shapes_test.py

@@ -58,6 +58,12 @@ import pytest
             "M30,10 50,30 10,30 z",
             None
         ),
+        # polyline
+        (
+            "<polyline points='30,10 50,30 10,30'/>",
+            "M30,10 50,30 10,30",
+            None
+        ),
         # circle, minimal valid example
         (
             "<circle r='1'/>",