C++ StringBuilder::characters方法代码示例

void StyledMarkupAccumulator::appendText(StringBuilder& out, Text* text)
{    
    const bool parentIsTextarea = text->parentElement() && text->parentElement()->tagQName() == textareaTag;
    const bool wrappingSpan = shouldApplyWrappingStyle(text) && !parentIsTextarea;
    if (wrappingSpan) {
        RefPtr<EditingStyle> wrappingStyle = m_wrappingStyle->copy();
        // FIXME: <rdar://problem/5371536> Style rules that match pasted content can change it's appearance
        // Make sure spans are inline style in paste side e.g. span { display: block }.
        wrappingStyle->forceInline();
        // FIXME: Should this be included in forceInline?
        wrappingStyle->style()->setProperty(CSSPropertyFloat, CSSValueNone);

        StringBuilder openTag;
        appendStyleNodeOpenTag(openTag, wrappingStyle->style(), text->document());
        out.append(openTag.characters(), openTag.length());
    }

    if (!shouldAnnotate() || parentIsTextarea)
        MarkupAccumulator::appendText(out, text);
    else {
        const bool useRenderedText = !enclosingNodeWithTag(firstPositionInNode(text), selectTag);
        String content = useRenderedText ? renderedText(text, m_range) : stringValueForRange(text, m_range);
        StringBuilder buffer;
        appendCharactersReplacingEntities(buffer, content.characters(), content.length(), EntityMaskInPCDATA);
        out.append(convertHTMLTextToInterchangeFormat(buffer.toString(), text));
    }

    if (wrappingSpan)
        out.append(styleNodeCloseTag());
}

// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
bool parseHTMLInteger(const String& input, int& value)
{
    // Step 1
    // Step 2
    const UChar* position = input.characters();
    const UChar* end = position + input.length();

    // Step 3
    int sign = 1;

    // Step 4
    while (position < end) {
        if (!isHTMLSpace(*position))
            break;
        ++position;
    }

    // Step 5
    if (position == end)
        return false;
    ASSERT(position < end);

    // Step 6
    if (*position == '-') {
        sign = -1;
        ++position;
    } else if (*position == '+')
        ++position;
    if (position == end)
        return false;
    ASSERT(position < end);

    // Step 7
    if (!isASCIIDigit(*position))
        return false;

    // Step 8
    StringBuilder digits;
    while (position < end) {
        if (!isASCIIDigit(*position))
            break;
        digits.append(*position++);
    }

    // Step 9
    bool ok;
    value = sign * charactersToIntStrict(digits.characters(), digits.length(), &ok);
    return ok;
}

TEST(StringBuilderTest, ToStringPreserveCapacity)
{
    StringBuilder builder;
    builder.append("0123456789");
    String string = builder.toStringPreserveCapacity();
    ASSERT_EQ(String("0123456789"), string);
    ASSERT_EQ(string.impl(), builder.toStringPreserveCapacity().impl());
    ASSERT_EQ(string.characters(), builder.characters());

    // Changing the StringBuilder should not affect the original result of toStringPreserveCapacity().
    builder.append("abcdefghijklmnopqrstuvwxyz");
    ASSERT_EQ(String("0123456789"), string);

    // Changing the StringBuilder should not affect the original result of toStringPreserveCapacity() in case the capacity is not changed.
    builder.reserveCapacity(200);
    string = builder.toStringPreserveCapacity();
    ASSERT_EQ(string.characters(), builder.characters());
    ASSERT_EQ(String("0123456789abcdefghijklmnopqrstuvwxyz"), string);
    builder.append("ABC");
    ASSERT_EQ(String("0123456789abcdefghijklmnopqrstuvwxyz"), string);

    // Changing the original result of toStringPreserveCapacity() should not affect the content of the StringBuilder.
    String string1 = builder.toStringPreserveCapacity();
    ASSERT_EQ(string1.characters(), builder.characters());
    ASSERT_EQ(String("0123456789abcdefghijklmnopqrstuvwxyzABC"), string1);
    string1.append("DEF");
    ASSERT_EQ(String("0123456789abcdefghijklmnopqrstuvwxyzABC"), builder.toStringPreserveCapacity());
    ASSERT_EQ(String("0123456789abcdefghijklmnopqrstuvwxyzABCDEF"), string1);

    // Resizing the StringBuilder should not affect the original result of toStringPreserveCapacity().
    string1 = builder.toStringPreserveCapacity();
    ASSERT_EQ(string.characters(), builder.characters());
    builder.resize(10);
    builder.append("###");
    ASSERT_EQ(String("0123456789abcdefghijklmnopqrstuvwxyzABC"), string1);
}

// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
bool parseHTMLNonNegativeInteger(const String& input, unsigned int& value)
{
    // Step 1
    // Step 2
    const UChar* position = input.characters();
    const UChar* end = position + input.length();

    // Step 3
    while (position < end) {
        if (!isHTMLSpace(*position))
            break;
        ++position;
    }

    // Step 4
    if (position == end)
        return false;
    ASSERT(position < end);

    // Step 5
    if (*position == '+')
        ++position;

    // Step 6
    if (position == end)
        return false;
    ASSERT(position < end);

    // Step 7
    if (!isASCIIDigit(*position))
        return false;

    // Step 8
    StringBuilder digits;
    while (position < end) {
        if (!isASCIIDigit(*position))
            break;
        digits.append(*position++);
    }

    // Step 9
    bool ok;
    value = charactersToUIntStrict(digits.characters(), digits.length(), &ok);
    return ok;
}

TEST(StringBuilderTest, Append)
{
    StringBuilder builder;
    builder.append(String("0123456789"));
    expectBuilderContent("0123456789", builder);
    builder.append("abcd");
    expectBuilderContent("0123456789abcd", builder);
    builder.append("efgh", 3);
    expectBuilderContent("0123456789abcdefg", builder);
    builder.append("");
    expectBuilderContent("0123456789abcdefg", builder);
    builder.append('#');
    expectBuilderContent("0123456789abcdefg#", builder);

    builder.toString(); // Test after reifyString().
    StringBuilder builder1;
    builder.append("", 0);
    expectBuilderContent("0123456789abcdefg#", builder);
    builder1.append(builder.characters(), builder.length());
    builder1.append("XYZ");
    builder.append(builder1.characters(), builder1.length());
    expectBuilderContent("0123456789abcdefg#0123456789abcdefg#XYZ", builder);
}

// http://www.whatwg.org/specs/web-apps/current-work/multipage/rendering.html#fonts-and-colors
static bool parseFontSize(const String& input, int& size)
{

    // Step 1
    // Step 2
    const UChar* position = input.characters();
    const UChar* end = position + input.length();

    // Step 3
    while (position < end) {
        if (!isHTMLSpace(*position))
            break;
        ++position;
    }

    // Step 4
    if (position == end)
        return false;
    ASSERT(position < end);

    // Step 5
    enum {
        RelativePlus,
        RelativeMinus,
        Absolute
    } mode;

    switch (*position) {
    case '+':
        mode = RelativePlus;
        ++position;
        break;
    case '-':
        mode = RelativeMinus;
        ++position;
        break;
    default:
        mode = Absolute;
        break;
    }

    // Step 6
    StringBuilder digits;
    digits.reserveCapacity(16);
    while (position < end) {
        if (!isASCIIDigit(*position))
            break;
        digits.append(*position++);
    }

    // Step 7
    if (digits.isEmpty())
        return false;

    // Step 8
    int value = charactersToIntStrict(digits.characters(), digits.length());

    // Step 9
    if (mode == RelativePlus)
        value += 3;
    else if (mode == RelativeMinus)
        value = 3 - value;

    // Step 10
    if (value > 7)
        value = 7;

    // Step 11
    if (value < 1)
        value = 1;

    size = value;
    return true;
}

void expectEmpty(const StringBuilder& builder)
{
    EXPECT_EQ(0U, builder.length());
    EXPECT_TRUE(builder.isEmpty());
    EXPECT_EQ(0, builder.characters());
}