[SVGDom] <polygon> & <polyline> support

experimental/svg/model/SkSVGAttributeParser.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkParse.h"
 #include "SkSVGAttributeParser.h"
 #include "SkSVGTypes.h"
@@ skipping 409 matching lines @@
     for (size_t i = 0; i < SK_ARRAY_COUNT(gJoinInfo); ++i) {
         if (this->parseExpectedStringToken(gJoinInfo[i].fName)) {
             *join = SkSVGLineJoin(gJoinInfo[i].fType);
             parsedValue = true;
             break;
         }
     }
 
     return parsedValue && this->parseEOSToken();
 }
+
+// https://www.w3.org/TR/SVG/shapes.html#PolygonElementPointsAttribute
+bool SkSVGAttributeParser::parsePoints(SkSVGPointsType* points) {
+    SkTDArray<SkPoint> pts;
+
+    bool parsedValue = false;
+    for (;;) {
+        this->parseWSToken();
+
+        SkScalar x, y;
+        if (!this->parseScalarToken(&x)) {
+            break;
+        }
+
+        // comma-wsp:
+        //     (wsp+ comma? wsp*) | (comma wsp*)
+        bool wsp   = this->parseWSToken();
+        bool comma = this->parseExpectedStringToken(",");
+        if (!(wsp || comma)) {
+            break;
+        }
+        this->parseWSToken();
+
+        if (!this->parseScalarToken(&y)) {
+            break;
+        }
+
+        pts.push(SkPoint::Make(x, y));
+        parsedValue = true;
+    }
+
+    if (parsedValue && this->parseEOSToken()) {
+        *points = pts;
+        return true;
+    }
+
+    return false;
+}