Tools/TestWebKitAPI/Tests/WTF/CStringView.cpp

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#include "config.h"
#include <wtf/text/CStringView.h>

#include <wtf/text/ASCIILiteral.h>
#include <wtf/text/WTFString.h>

namespace TestWebKitAPI {

TEST(WTF, CStringViewNullAndEmpty)
{
    CStringView string;
    EXPECT_TRUE(string.isNull());
    EXPECT_TRUE(string.isEmpty());
    EXPECT_EQ(string.utf8(), nullptr);
    EXPECT_TRUE(!string);
    EXPECT_FALSE(string);

    string = CStringView(nullptr);
    EXPECT_TRUE(string.isNull());
    EXPECT_TRUE(string.isEmpty());
    EXPECT_EQ(string.utf8(), nullptr);
    EXPECT_TRUE(!string);
    EXPECT_FALSE(string);

    string = CStringView(""_s);
    EXPECT_TRUE(string.isNull());
    EXPECT_TRUE(string.isEmpty());
    EXPECT_EQ(string.utf8(), nullptr);
    EXPECT_TRUE(!string);
    EXPECT_FALSE(string);

    string = CStringView("test"_s);
    EXPECT_FALSE(string.isNull());
    EXPECT_FALSE(string.isEmpty());
    EXPECT_TRUE(string.utf8());
    EXPECT_FALSE(!string);
    EXPECT_TRUE(string);
}

TEST(WTF, CStringViewSize)
{
    CStringView string;
    EXPECT_EQ(string.lengthInBytes(), 0UZ);
    EXPECT_EQ(string.span().size(), 0UZ);
    EXPECT_EQ(string.spanIncludingNullTerminator().size(), 0UZ);

    string = CStringView("test"_s);
    EXPECT_EQ(string.lengthInBytes(), 4UZ);
    EXPECT_EQ(string.span().size(), 4UZ);
    EXPECT_EQ(string.spanIncludingNullTerminator().size(), 5UZ);

    string = CStringView::unsafeFromUTF8("water🍉melon");
    EXPECT_EQ(string.lengthInBytes(), 14UZ);
    EXPECT_EQ(string.span().size(), 14UZ);
    EXPECT_EQ(string.spanIncludingNullTerminator().size(), 15UZ);
}

TEST(WTF, CStringViewFrom)
{
    const char* stringPtr = "test";
    CStringView string = CStringView::unsafeFromUTF8(stringPtr);
    EXPECT_EQ(string.lengthInBytes(), 4UZ);
    EXPECT_TRUE(string);
    EXPECT_EQ(string.utf8(), stringPtr);
    string = CStringView::fromUTF8(byteCast<char8_t>(unsafeSpanIncludingNullTerminator(stringPtr)));
    EXPECT_EQ(string.lengthInBytes(), 4UZ);
    EXPECT_TRUE(string);
    EXPECT_EQ(string.utf8(), stringPtr);

    stringPtr = nullptr;
    string = CStringView::unsafeFromUTF8(stringPtr);
    EXPECT_EQ(string.lengthInBytes(), 0UZ);
    EXPECT_FALSE(string);
    EXPECT_EQ(string.utf8(), stringPtr);
    string = CStringView::fromUTF8(byteCast<char8_t>(unsafeSpanIncludingNullTerminator(stringPtr)));
    EXPECT_EQ(string.lengthInBytes(), 0UZ);
    EXPECT_FALSE(string);
    EXPECT_EQ(string.utf8(), stringPtr);

    stringPtr = "";
    string = CStringView::unsafeFromUTF8(stringPtr);
    EXPECT_EQ(string.lengthInBytes(), 0UZ);
    EXPECT_FALSE(string);
    EXPECT_EQ(string.utf8(), stringPtr);
    string = CStringView::fromUTF8(byteCast<char8_t>(unsafeSpanIncludingNullTerminator(stringPtr)));
    EXPECT_EQ(string.lengthInBytes(), 0UZ);
    EXPECT_FALSE(string);
    EXPECT_EQ(string.utf8(), stringPtr);

    stringPtr = "water🍉melon";
    string = CStringView::unsafeFromUTF8(stringPtr);
    EXPECT_EQ(string.lengthInBytes(), 14UZ);
    EXPECT_TRUE(string);
    EXPECT_EQ(string.utf8(), stringPtr);
    string = CStringView::fromUTF8(byteCast<char8_t>(unsafeSpanIncludingNullTerminator(stringPtr)));
    EXPECT_EQ(string.lengthInBytes(), 14UZ);
    EXPECT_TRUE(string);
    EXPECT_EQ(string.utf8(), stringPtr);
}

TEST(WTF, CStringViewEquality)
{
    CStringView string("Test"_s);
    CStringView sameString("Test"_s);
    CStringView anotherString("another test"_s);
    CStringView emptyString;
    CStringView nullString(nullptr);
    EXPECT_TRUE(string != emptyString);
    EXPECT_EQ(string, string);
    EXPECT_EQ(string, sameString);
    EXPECT_TRUE(string != anotherString);
    EXPECT_EQ(emptyString, nullString);

    char* bareEmptyString = strdup("");
    char* bareEmptyString2 = strdup("");
    emptyString = CStringView::unsafeFromUTF8(bareEmptyString);
    auto emptyString2 = CStringView::unsafeFromUTF8(bareEmptyString2);
    EXPECT_EQ(emptyString, emptyString2);
    free(bareEmptyString);
    free(bareEmptyString2);
}

} // namespace TestWebKitAPI