C++ StringView::toStringWithoutCopying方法代码示例

TextEncoding HTMLMetaCharsetParser::encodingFromMetaAttributes(const AttributeList& attributes)
{
    bool gotPragma = false;
    enum { None, Charset, Pragma } mode = None;
    StringView charset;

    for (auto& attribute : attributes) {
        const String& attributeName = attribute.first;
        const String& attributeValue = attribute.second;

        if (attributeName == http_equivAttr) {
            if (equalIgnoringCase(attributeValue, "content-type"))
                gotPragma = true;
        } else if (charset.isEmpty()) {
            if (attributeName == charsetAttr) {
                charset = attributeValue;
                mode = Charset;
            } else if (attributeName == contentAttr) {
                charset = extractCharset(attributeValue);
                if (charset.length())
                    mode = Pragma;
            }
        }
    }

    if (mode == Charset || (mode == Pragma && gotPragma))
        return TextEncoding(stripLeadingAndTrailingHTMLSpaces(charset.toStringWithoutCopying()));

    return TextEncoding();
}

Vector<TextCheckingResult> WebEditorClient::checkTextOfParagraph(StringView stringView, WebCore::TextCheckingTypeMask checkingTypes, const VisibleSelection& currentSelection)
{
    Vector<TextCheckingResult> results;

    m_page->sendSync(Messages::WebPageProxy::CheckTextOfParagraph(stringView.toStringWithoutCopying(), checkingTypes, insertionPointFromCurrentSelection(currentSelection)), Messages::WebPageProxy::CheckTextOfParagraph::Reply(results));

    return results;
}

EncodedJSValue JSC_HOST_CALL functionProtoFuncToString(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSValue thisValue = exec->thisValue();
    if (thisValue.inherits(JSFunction::info())) {
        JSFunction* function = jsCast<JSFunction*>(thisValue);
        if (function->isHostOrBuiltinFunction()) {
            scope.release();
            return JSValue::encode(jsMakeNontrivialString(exec, "function ", function->name(vm), "() {\n    [native code]\n}"));
        }

        FunctionExecutable* executable = function->jsExecutable();
        if (executable->isClass()) {
            StringView classSource = executable->classSource().view();
            return JSValue::encode(jsString(exec, classSource.toStringWithoutCopying()));
        }

        if (thisValue.inherits(JSAsyncFunction::info())) {
            String functionHeader = executable->isArrowFunction() ? "async " : "async function ";

            StringView source = executable->source().provider()->getRange(
                executable->parametersStartOffset(),
                executable->parametersStartOffset() + executable->source().length());
            return JSValue::encode(jsMakeNontrivialString(exec, functionHeader, function->name(vm), source));
        }

        String functionHeader = executable->isArrowFunction() ? "" : "function ";
        
        StringView source = executable->source().provider()->getRange(
            executable->parametersStartOffset(),
            executable->parametersStartOffset() + executable->source().length());
        scope.release();
        return JSValue::encode(jsMakeNontrivialString(exec, functionHeader, function->name(vm), source));
    }

    if (thisValue.inherits(InternalFunction::info())) {
        InternalFunction* function = asInternalFunction(thisValue);
        scope.release();
        return JSValue::encode(jsMakeNontrivialString(exec, "function ", function->name(), "() {\n    [native code]\n}"));
    }

    if (thisValue.isObject()) {
        JSObject* object = asObject(thisValue);
        if (object->inlineTypeFlags() & TypeOfShouldCallGetCallData) {
            CallData callData;
            if (object->methodTable(vm)->getCallData(object, callData) != CallType::None) {
                if (auto* classInfo = object->classInfo()) {
                    scope.release();
                    return JSValue::encode(jsMakeNontrivialString(exec, "function ", classInfo->className, "() {\n    [native code]\n}"));
                }
            }
        }
    }

    return throwVMTypeError(exec, scope);
}

void WebEditorClient::checkGrammarOfString(StringView text, Vector<WebCore::GrammarDetail>& grammarDetails, int* badGrammarLocation, int* badGrammarLength)
{
    int32_t resultLocation = -1;
    int32_t resultLength = 0;
    m_page->sendSync(Messages::WebPageProxy::CheckGrammarOfString(text.toStringWithoutCopying()),
        Messages::WebPageProxy::CheckGrammarOfString::Reply(grammarDetails, resultLocation, resultLength));
    *badGrammarLocation = resultLocation;
    *badGrammarLength = resultLength;
}

void WebEditorClient::checkSpellingOfString(StringView text, int* misspellingLocation, int* misspellingLength)
{
    int32_t resultLocation = -1;
    int32_t resultLength = 0;
    m_page->sendSync(Messages::WebPageProxy::CheckSpellingOfString(text.toStringWithoutCopying()),
        Messages::WebPageProxy::CheckSpellingOfString::Reply(resultLocation, resultLength));
    *misspellingLocation = resultLocation;
    *misspellingLength = resultLength;
}

size_t lastHyphenLocation(StringView string, size_t beforeIndex, const AtomicString& localeIdentifier)
{
    // libhyphen accepts strings in UTF-8 format, but WebCore can only provide StringView
    // which stores either UTF-16 or Latin1 data. This is unfortunate for performance
    // reasons and we should consider switching to a more flexible hyphenation library
    // if it is available.
    CString utf8StringCopy = string.toStringWithoutCopying().utf8();

    // WebCore often passes strings like " wordtohyphenate" to the platform layer. Since
    // libhyphen isn't advanced enough to deal with leading spaces (presumably CoreFoundation
    // can), we should find the appropriate indexes into the string to skip them.
    int32_t leadingSpaceBytes;
    int32_t leadingSpaceCharacters;
    countLeadingSpaces(utf8StringCopy, leadingSpaceBytes, leadingSpaceCharacters);

    // The libhyphen documentation specifies that this array should be 5 bytes longer than
    // the byte length of the input string.
    Vector<char> hyphenArray(utf8StringCopy.length() - leadingSpaceBytes + 5);
    char* hyphenArrayData = hyphenArray.data();

    String lowercaseLocaleIdentifier = AtomicString(localeIdentifier.string().convertToASCIILowercase());
    ASSERT(availableLocales().contains(lowercaseLocaleIdentifier));
    for (const auto& dictionaryPath : availableLocales().get(lowercaseLocaleIdentifier)) {
        RefPtr<HyphenationDictionary> dictionary = TinyLRUCachePolicy<AtomicString, RefPtr<HyphenationDictionary>>::cache().get(AtomicString(dictionaryPath));

        char** replacements = nullptr;
        int* positions = nullptr;
        int* removedCharacterCounts = nullptr;
        hnj_hyphen_hyphenate2(dictionary->libhyphenDictionary(),
            utf8StringCopy.data() + leadingSpaceBytes,
            utf8StringCopy.length() - leadingSpaceBytes,
            hyphenArrayData,
            nullptr, /* output parameter for hyphenated word */
            &replacements,
            &positions,
            &removedCharacterCounts);

        if (replacements) {
            for (unsigned i = 0; i < utf8StringCopy.length() - leadingSpaceBytes - 1; i++)
                free(replacements[i]);
            free(replacements);
        }

        free(positions);
        free(removedCharacterCounts);

        for (int i = beforeIndex - leadingSpaceCharacters - 2; i >= 0; i--) {
            // libhyphen will put an odd number in hyphenArrayData at all
            // hyphenation points. A number & 1 will be true for odd numbers.
            if (hyphenArrayData[i] & 1)
                return i + 1 + leadingSpaceCharacters;
        }
    }

    return 0;
}

void TextChecker::checkSpellingOfString(int64_t spellDocumentTag, StringView text, int32_t& misspellingLocation, int32_t& misspellingLength)
{
#if ENABLE(SPELLCHECK)
    WebTextChecker::shared()->client().checkSpellingOfString(spellDocumentTag, text.toStringWithoutCopying(), misspellingLocation, misspellingLength);
#else
    UNUSED_PARAM(spellDocumentTag);
    UNUSED_PARAM(text);
    UNUSED_PARAM(misspellingLocation);
    UNUSED_PARAM(misspellingLength);
#endif
}