1 files changed, 251 insertions, 0 deletions
diff --git a/dom/svg/SVGTransformListParser.cpp b/dom/svg/SVGTransformListParser.cpp
new file mode 100644
index 0000000000..692577bea7
--- /dev/null
+++ b/dom/svg/SVGTransformListParser.cpp
@@ -0,0 +1,251 @@
+/* -*- 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/. */
+
+#include "SVGTransformListParser.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "SVGContentUtils.h"
+#include "SVGTransform.h"
+#include "nsGkAtoms.h"
+#include "nsAtom.h"
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// private methods
+
+bool SVGTransformListParser::Parse() {
+  mTransforms.Clear();
+  return ParseTransforms();
+}
+
+bool SVGTransformListParser::ParseTransforms() {
+  if (!SkipWsp()) {
+    return true;
+  }
+
+  if (!ParseTransform()) {
+    return false;
+  }
+
+  while (SkipWsp()) {
+    // The SVG BNF allows multiple comma-wsp between transforms
+    while (*mIter == ',') {
+      ++mIter;
+      if (!SkipWsp()) {
+        return false;
+      }
+    }
+
+    if (!ParseTransform()) {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool SVGTransformListParser::ParseTransform() {
+  RangedPtr<const char16_t> start(mIter);
+  while (IsAlpha(*mIter)) {
+    ++mIter;
+    if (mIter == mEnd) {
+      return false;
+    }
+  }
+
+  if (start == mIter) {
+    // Didn't read anything
+    return false;
+  }
+
+  const nsAString& transform = Substring(start.get(), mIter.get());
+  nsStaticAtom* keyAtom = NS_GetStaticAtom(transform);
+
+  if (!keyAtom || !SkipWsp()) {
+    return false;
+  }
+
+  if (keyAtom == nsGkAtoms::translate) {
+    return ParseTranslate();
+  }
+  if (keyAtom == nsGkAtoms::scale) {
+    return ParseScale();
+  }
+  if (keyAtom == nsGkAtoms::rotate) {
+    return ParseRotate();
+  }
+  if (keyAtom == nsGkAtoms::skewX) {
+    return ParseSkewX();
+  }
+  if (keyAtom == nsGkAtoms::skewY) {
+    return ParseSkewY();
+  }
+  if (keyAtom == nsGkAtoms::matrix) {
+    return ParseMatrix();
+  }
+  return false;
+}
+
+bool SVGTransformListParser::ParseArguments(float* aResult, uint32_t aMaxCount,
+                                            uint32_t* aParsedCount) {
+  if (*mIter != '(') {
+    return false;
+  }
+  ++mIter;
+
+  if (!SkipWsp()) {
+    return false;
+  }
+
+  if (!SVGContentUtils::ParseNumber(mIter, mEnd, aResult[0])) {
+    return false;
+  }
+  *aParsedCount = 1;
+
+  while (SkipWsp()) {
+    if (*mIter == ')') {
+      ++mIter;
+      return true;
+    }
+    if (*aParsedCount == aMaxCount) {
+      return false;
+    }
+    SkipCommaWsp();
+    if (!SVGContentUtils::ParseNumber(mIter, mEnd,
+                                      aResult[(*aParsedCount)++])) {
+      return false;
+    }
+  }
+  return false;
+}
+
+bool SVGTransformListParser::ParseTranslate() {
+  float t[2];
+  uint32_t count;
+
+  if (!ParseArguments(t, ArrayLength(t), &count)) {
+    return false;
+  }
+
+  switch (count) {
+    case 1:
+      t[1] = 0.f;
+      [[fallthrough]];
+    case 2: {
+      SVGTransform* transform = mTransforms.AppendElement(fallible);
+      if (!transform) {
+        return false;
+      }
+      transform->SetTranslate(t[0], t[1]);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool SVGTransformListParser::ParseScale() {
+  float s[2];
+  uint32_t count;
+
+  if (!ParseArguments(s, ArrayLength(s), &count)) {
+    return false;
+  }
+
+  switch (count) {
+    case 1:
+      s[1] = s[0];
+      [[fallthrough]];
+    case 2: {
+      SVGTransform* transform = mTransforms.AppendElement(fallible);
+      if (!transform) {
+        return false;
+      }
+      transform->SetScale(s[0], s[1]);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool SVGTransformListParser::ParseRotate() {
+  float r[3];
+  uint32_t count;
+
+  if (!ParseArguments(r, ArrayLength(r), &count)) {
+    return false;
+  }
+
+  switch (count) {
+    case 1:
+      r[1] = r[2] = 0.f;
+      [[fallthrough]];
+    case 3: {
+      SVGTransform* transform = mTransforms.AppendElement(fallible);
+      if (!transform) {
+        return false;
+      }
+      transform->SetRotate(r[0], r[1], r[2]);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool SVGTransformListParser::ParseSkewX() {
+  float skew;
+  uint32_t count;
+
+  if (!ParseArguments(&skew, 1, &count) || count != 1) {
+    return false;
+  }
+
+  SVGTransform* transform = mTransforms.AppendElement(fallible);
+  if (!transform) {
+    return false;
+  }
+  transform->SetSkewX(skew);
+
+  return true;
+}
+
+bool SVGTransformListParser::ParseSkewY() {
+  float skew;
+  uint32_t count;
+
+  if (!ParseArguments(&skew, 1, &count) || count != 1) {
+    return false;
+  }
+
+  SVGTransform* transform = mTransforms.AppendElement(fallible);
+  if (!transform) {
+    return false;
+  }
+  transform->SetSkewY(skew);
+
+  return true;
+}
+
+bool SVGTransformListParser::ParseMatrix() {
+  float m[6];
+  uint32_t count;
+
+  if (!ParseArguments(m, ArrayLength(m), &count) || count != 6) {
+    return false;
+  }
+
+  SVGTransform* transform = mTransforms.AppendElement(fallible);
+  if (!transform) {
+    return false;
+  }
+  transform->SetMatrix(gfxMatrix(m[0], m[1], m[2], m[3], m[4], m[5]));
+
+  return true;
+}
+
+}  // namespace mozilla