Add StringView constructor that takes a ref to save a branch in CSSTokenizerInputStream::rangeAt

third_party/WebKit/Source/wtf/text/StringViewTest.cpp

 // Copyright 2016 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 "wtf/text/StringView.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/StringImpl.h"
 #include "wtf/text/WTFString.h"
@@ skipping 53 matching lines @@
 
     // StringView(StringImpl*, unsigned offset, unsigned length);
     ASSERT_FALSE(StringView(impl16Bit.get(), 2, 1).is8Bit());
     EXPECT_FALSE(StringView(impl16Bit.get(), 2, 1).isNull());
     EXPECT_EQ(impl16Bit->characters16() + 2, StringView(impl16Bit.get(), 2, 1).characters16());
     EXPECT_EQ(1u, StringView(impl16Bit.get(), 2, 1).length());
     EXPECT_EQ(StringView("3"), StringView(impl16Bit.get(), 2, 1));
     EXPECT_STREQ("3", StringView(impl16Bit.get(), 2, 1).toString().utf8().data());
 }
 
+TEST(StringViewTest, ConstructionStringImplRef8)
+{
+    RefPtr<StringImpl> impl8Bit = StringImpl::create(kChars8, 5);
+
+    // StringView(StringImpl&);
+    ASSERT_TRUE(StringView(*impl8Bit).is8Bit());
+    EXPECT_FALSE(StringView(*impl8Bit).isNull());
+    EXPECT_EQ(impl8Bit->characters8(), StringView(*impl8Bit).characters8());
+    EXPECT_EQ(impl8Bit->length(), StringView(*impl8Bit).length());
+    EXPECT_STREQ(kChars, StringView(*impl8Bit).toString().utf8().data());
+
+    // StringView(StringImpl&, unsigned offset);
+    ASSERT_TRUE(StringView(*impl8Bit, 2).is8Bit());
+    EXPECT_FALSE(StringView(*impl8Bit, 2).isNull());
+    EXPECT_EQ(impl8Bit->characters8() + 2, StringView(*impl8Bit, 2).characters8());
+    EXPECT_EQ(3u, StringView(*impl8Bit, 2).length());
+    EXPECT_EQ(StringView("345"), StringView(*impl8Bit, 2));
+    EXPECT_STREQ("345", StringView(*impl8Bit, 2).toString().utf8().data());
+
+    // StringView(StringImpl&, unsigned offset, unsigned length);
+    ASSERT_TRUE(StringView(*impl8Bit, 2, 1).is8Bit());
+    EXPECT_FALSE(StringView(*impl8Bit, 2, 1).isNull());
+    EXPECT_EQ(impl8Bit->characters8() + 2, StringView(*impl8Bit, 2, 1).characters8());
+    EXPECT_EQ(1u, StringView(*impl8Bit, 2, 1).length());
+    EXPECT_EQ(StringView("3"), StringView(*impl8Bit, 2, 1));
+    EXPECT_STREQ("3", StringView(*impl8Bit, 2, 1).toString().utf8().data());
+}
+
+TEST(StringViewTest, ConstructionStringImplRef16)
+{
+    RefPtr<StringImpl> impl16Bit = StringImpl::create(kChars16, 5);
+
+    // StringView(StringImpl&);
+    ASSERT_FALSE(StringView(*impl16Bit).is8Bit());
+    EXPECT_FALSE(StringView(*impl16Bit).isNull());
+    EXPECT_EQ(impl16Bit->characters16(), StringView(*impl16Bit).characters16());
+    EXPECT_EQ(impl16Bit->length(), StringView(*impl16Bit).length());
+    EXPECT_STREQ(kChars, StringView(*impl16Bit).toString().utf8().data());
+
+    // StringView(StringImpl&, unsigned offset);
+    ASSERT_FALSE(StringView(*impl16Bit, 2).is8Bit());
+    EXPECT_FALSE(StringView(*impl16Bit, 2).isNull());
+    EXPECT_EQ(impl16Bit->characters16() + 2, StringView(*impl16Bit, 2).characters16());
+    EXPECT_EQ(3u, StringView(*impl16Bit, 2).length());
+    EXPECT_EQ(StringView("345"), StringView(*impl16Bit, 2));
+    EXPECT_STREQ("345", StringView(*impl16Bit, 2).toString().utf8().data());
+
+    // StringView(StringImpl&, unsigned offset, unsigned length);
+    ASSERT_FALSE(StringView(*impl16Bit, 2, 1).is8Bit());
+    EXPECT_FALSE(StringView(*impl16Bit, 2, 1).isNull());
+    EXPECT_EQ(impl16Bit->characters16() + 2, StringView(*impl16Bit, 2, 1).characters16());
+    EXPECT_EQ(1u, StringView(*impl16Bit, 2, 1).length());
+    EXPECT_EQ(StringView("3"), StringView(*impl16Bit, 2, 1));
+    EXPECT_STREQ("3", StringView(*impl16Bit, 2, 1).toString().utf8().data());
+}
+
 TEST(StringViewTest, ConstructionString8)
 {
     String string8Bit = String(StringImpl::create(kChars8, 5));
 
     // StringView(const String&);
     ASSERT_TRUE(StringView(string8Bit).is8Bit());
     EXPECT_FALSE(StringView(string8Bit).isNull());
     EXPECT_EQ(string8Bit.characters8(), StringView(string8Bit).characters8());
     EXPECT_EQ(string8Bit.length(), StringView(string8Bit).length());
     EXPECT_STREQ(kChars, StringView(string8Bit).toString().utf8().data());
@@ skipping 303 matching lines @@
 
     EXPECT_TRUE(equalIgnoringASCIICase(StringView("link"), "lInK"));
     EXPECT_FALSE(equalIgnoringASCIICase(StringView("link"), "INKL"));
     EXPECT_FALSE(equalIgnoringASCIICase(StringView("link"), "link different length"));
     EXPECT_FALSE(equalIgnoringASCIICase(StringView("link different length"), "link"));
 
     EXPECT_TRUE(equalIgnoringASCIICase(StringView(""), ""));
 }
 
 } // namespace WTF