Make InsertIncrementalTextCommand to handle surrogate pair

third_party/WebKit/Source/core/editing/commands/InsertIncrementalTextCommandTest.cpp

+// Copyright (c) 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/editing/commands/InsertIncrementalTextCommand.h"
+
+#include "core/editing/EditingTestBase.h"
+#include "core/editing/FrameSelection.h"
+
+namespace blink {
+
+class InsertIncrementalTextCommandTest : public EditingTestBase {};
+
+// http://crbug.com/706166
+TEST_F(InsertIncrementalTextCommandTest, SurrogatePairsReplace) {
+  setBodyContent("<div id=sample contenteditable><a>a</a>b&#x1F63A;</div>");
+  Element* const sample = document().getElementById("sample");
+  const String newText(Vector<UChar>{0xD83D, 0xDE38});  // U+1F638
+  selection().setSelection(SelectionInDOMTree::Builder()
+                               .collapse(Position(sample->lastChild(), 1))
+                               .extend(Position(sample->lastChild(), 3))
+                               .build());
+  CompositeEditCommand* const command =
+      InsertIncrementalTextCommand::create(document(), newText);
+  command->apply();
+
+  EXPECT_EQ(String(Vector<UChar>{'b', 0xD83D, 0xDE38}),
+            sample->lastChild()->nodeValue())
+      << "Replace 'U+D83D U+DE3A (U+1F63A) with 'U+D83D U+DE38'(U+1F638)";
+}
+
+TEST_F(InsertIncrementalTextCommandTest, SurrogatePairsNoReplace) {
+  setBodyContent("<div id=sample contenteditable><a>a</a>b&#x1F63A;</div>");
+  Element* const sample = document().getElementById("sample");
+  const String newText(Vector<UChar>{0xD83D, 0xDE3A});  // U+1F63A
+  selection().setSelection(SelectionInDOMTree::Builder()
+                               .collapse(Position(sample->lastChild(), 1))
+                               .extend(Position(sample->lastChild(), 3))
+                               .build());
+  CompositeEditCommand* const command =
+      InsertIncrementalTextCommand::create(document(), newText);
+  command->apply();
+
+  EXPECT_EQ(String(Vector<UChar>{'b', 0xD83D, 0xDE3A}),
+            sample->lastChild()->nodeValue())
+      << "Replace 'U+D83D U+DE3A(U+1F63A) with 'U+D83D U+DE3A'(U+1F63A)";
+}
+
+// http://crbug.com/706166
+TEST_F(InsertIncrementalTextCommandTest, SurrogatePairsTwo) {
+  setBodyContent(
+      "<div id=sample contenteditable><a>a</a>b&#x1F63A;&#x1F63A;</div>");
+  Element* const sample = document().getElementById("sample");
+  const String newText(Vector<UChar>{0xD83D, 0xDE38});  // U+1F638
+  selection().setSelection(SelectionInDOMTree::Builder()
+                               .collapse(Position(sample->lastChild(), 1))
+                               .extend(Position(sample->lastChild(), 5))
+                               .build());
+  CompositeEditCommand* const command =
+      InsertIncrementalTextCommand::create(document(), newText);
+  command->apply();
+
+  EXPECT_EQ(String(Vector<UChar>{'b', 0xD83D, 0xDE38}),
+            sample->lastChild()->nodeValue())
+      << "Replace 'U+1F63A U+1F63A with U+1F638";
+}
+
+}  // namespace blink