1 files changed, 74 insertions, 0 deletions
diff --git a/dom/svg/SVGPathDataParser.h b/dom/svg/SVGPathDataParser.h
new file mode 100644
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+++ b/dom/svg/SVGPathDataParser.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_SVG_SVGPATHDATAPARSER_H_
+#define DOM_SVG_SVGPATHDATAPARSER_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/gfx/Point.h"
+#include "SVGDataParser.h"
+
+namespace mozilla {
+class SVGPathData;
+
+////////////////////////////////////////////////////////////////////////
+// SVGPathDataParser: a simple recursive descent parser that builds
+// DOMSVGPathSegs from path data strings. The grammar for path data
+// can be found in SVG CR 20001102, chapter 8.
+
+class SVGPathDataParser : public SVGDataParser {
+ public:
+  SVGPathDataParser(const nsAString& aValue, mozilla::SVGPathData* aList)
+      : SVGDataParser(aValue), mPathSegList(aList) {
+    MOZ_ASSERT(aList, "null path data");
+  }
+
+  bool Parse();
+
+ private:
+  bool ParseCoordPair(float& aX, float& aY);
+  bool ParseFlag(bool& aFlag);
+
+  bool ParsePath();
+  bool IsStartOfSubPath() const;
+  bool ParseSubPath();
+
+  bool ParseSubPathElements();
+  bool ParseSubPathElement(char16_t aCommandType, bool aAbsCoords);
+
+  bool ParseMoveto();
+  bool ParseClosePath();
+  bool ParseLineto(bool aAbsCoords);
+  bool ParseHorizontalLineto(bool aAbsCoords);
+  bool ParseVerticalLineto(bool aAbsCoords);
+  bool ParseCurveto(bool aAbsCoords);
+  bool ParseSmoothCurveto(bool aAbsCoords);
+  bool ParseQuadBezierCurveto(bool aAbsCoords);
+  bool ParseSmoothQuadBezierCurveto(bool aAbsCoords);
+  bool ParseEllipticalArc(bool aAbsCoords);
+
+  mozilla::SVGPathData* const mPathSegList;
+};
+
+class SVGArcConverter {
+  using Point = mozilla::gfx::Point;
+
+ public:
+  SVGArcConverter(const Point& from, const Point& to, const Point& radii,
+                  double angle, bool largeArcFlag, bool sweepFlag);
+  bool GetNextSegment(Point* cp1, Point* cp2, Point* to);
+
+ protected:
+  int32_t mNumSegs, mSegIndex;
+  double mTheta, mDelta, mT;
+  double mSinPhi, mCosPhi;
+  double mRx, mRy;
+  Point mFrom, mC;
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGPATHDATAPARSER_H_