/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{
static bool isValidXmlNameStartCharacter (juce_wchar character) noexcept
{
    return character == ':'
        || character == '_'
        || (character >= 'a'     && character <= 'z')
        || (character >= 'A'     && character <= 'Z')
        || (character >= 0xc0    && character <= 0xd6)
        || (character >= 0xd8    && character <= 0xf6)
        || (character >= 0xf8    && character <= 0x2ff)
        || (character >= 0x370   && character <= 0x37d)
        || (character >= 0x37f   && character <= 0x1fff)
        || (character >= 0x200c  && character <= 0x200d)
        || (character >= 0x2070  && character <= 0x218f)
        || (character >= 0x2c00  && character <= 0x2fef)
        || (character >= 0x3001  && character <= 0xd7ff)
        || (character >= 0xf900  && character <= 0xfdcf)
        || (character >= 0xfdf0  && character <= 0xfffd)
        || (character >= 0x10000 && character <= 0xeffff);
}

static bool isValidXmlNameBodyCharacter (juce_wchar character) noexcept
{
    return isValidXmlNameStartCharacter (character)
        || character == '-'
        || character == '.'
        || character == 0xb7
        || (character >= '0'    && character <= '9')
        || (character >= 0x300  && character <= 0x036f)
        || (character >= 0x203f && character <= 0x2040);
}

XmlElement::XmlAttributeNode::XmlAttributeNode (const XmlAttributeNode& other) noexcept
    : attribute (other.attribute)
{
}

XmlElement::XmlAttributeNode::XmlAttributeNode (const Identifier& n, const String& v) noexcept
    : attribute { n, v }
{
    jassert (isValidXmlName (attribute.name));
}

XmlElement::XmlAttributeNode::XmlAttributeNode (String::CharPointerType nameStart, String::CharPointerType nameEnd)
    : XmlAttributeNode ({ nameStart, nameEnd }, {})
{
}

//==============================================================================
XmlElement::XmlElement (const String& tag)
    : tagName (StringPool::getGlobalPool().getPooledString (tag))
{
    jassert (isValidXmlName (tagName));
}

XmlElement::XmlElement (const char* tag)
    : tagName (StringPool::getGlobalPool().getPooledString (tag))
{
    jassert (isValidXmlName (tagName));
}

XmlElement::XmlElement (StringRef tag)
    : tagName (StringPool::getGlobalPool().getPooledString (tag))
{
    jassert (isValidXmlName (tagName));
}

XmlElement::XmlElement (const Identifier& tag)
    : tagName (tag.toString())
{
    jassert (isValidXmlName (tagName));
}

XmlElement::XmlElement (String::CharPointerType tagNameStart, String::CharPointerType tagNameEnd)
    : tagName (StringPool::getGlobalPool().getPooledString (tagNameStart, tagNameEnd))
{
    jassert (isValidXmlName (tagName));
}

XmlElement::XmlElement (int /*dummy*/) noexcept
{
}

XmlElement::XmlElement (const XmlElement& other)
    : tagName (other.tagName)
{
    copyChildrenAndAttributesFrom (other);
}

XmlElement& XmlElement::operator= (const XmlElement& other)
{
    if (this != &other)
    {
        removeAllAttributes();
        deleteAllChildElements();
        tagName = other.tagName;
        copyChildrenAndAttributesFrom (other);
    }

    return *this;
}

XmlElement::XmlElement (XmlElement&& other) noexcept
    : nextListItem      (std::move (other.nextListItem)),
      firstChildElement (std::move (other.firstChildElement)),
      attributes        (std::move (other.attributes)),
      tagName           (std::move (other.tagName))
{
}

XmlElement& XmlElement::operator= (XmlElement&& other) noexcept
{
    jassert (this != &other); // hopefully the compiler should make this situation impossible!

    removeAllAttributes();
    deleteAllChildElements();

    nextListItem      = std::move (other.nextListItem);
    firstChildElement = std::move (other.firstChildElement);
    attributes        = std::move (other.attributes);
    tagName           = std::move (other.tagName);

    return *this;
}

void XmlElement::copyChildrenAndAttributesFrom (const XmlElement& other)
{
    jassert (firstChildElement.get() == nullptr);
    firstChildElement.addCopyOfList (other.firstChildElement);

    jassert (attributes.get() == nullptr);
    attributes.addCopyOfList (other.attributes);
}

XmlElement::~XmlElement() noexcept
{
    firstChildElement.deleteAll();
    attributes.deleteAll();
}

//==============================================================================
namespace XmlOutputFunctions
{
    namespace LegalCharLookupTable
    {
        template <int c>
        struct Bit
        {
            enum { v = ((c >= 'a' && c <= 'z')
                     || (c >= 'A' && c <= 'Z')
                     || (c >= '0' && c <= '9')
                     || c == ' ' || c == '.'  || c == ',' || c == ';'
                     || c == ':' || c == '-'  || c == '(' || c == ')'
                     || c == '_' || c == '+'  || c == '=' || c == '?'
                     || c == '!' || c == '$'  || c == '#' || c == '@'
                     || c == '[' || c == ']'  || c == '/' || c == '|'
                     || c == '*' || c == '%'  || c == '~' || c == '{'
                     || c == '}' || c == '\'' || c == '\\')
                        ? (1 << (c & 7)) : 0 };
        };

        template <int tableIndex>
        struct Byte
        {
            enum { v = (int) Bit<tableIndex * 8 + 0>::v | (int) Bit<tableIndex * 8 + 1>::v
                     | (int) Bit<tableIndex * 8 + 2>::v | (int) Bit<tableIndex * 8 + 3>::v
                     | (int) Bit<tableIndex * 8 + 4>::v | (int) Bit<tableIndex * 8 + 5>::v
                     | (int) Bit<tableIndex * 8 + 6>::v | (int) Bit<tableIndex * 8 + 7>::v };
        };

        static bool isLegal (uint32 c) noexcept
        {
            static const unsigned char legalChars[] = { Byte< 0>::v, Byte< 1>::v, Byte< 2>::v, Byte< 3>::v,
                                                        Byte< 4>::v, Byte< 5>::v, Byte< 6>::v, Byte< 7>::v,
                                                        Byte< 8>::v, Byte< 9>::v, Byte<10>::v, Byte<11>::v,
                                                        Byte<12>::v, Byte<13>::v, Byte<14>::v, Byte<15>::v };

            return c < sizeof (legalChars) * 8
                     && (legalChars[c >> 3] & (1 << (c & 7))) != 0;
        }
    }

    static void escapeIllegalXmlChars (OutputStream& outputStream, const String& text, bool changeNewLines)
    {
        auto t = text.getCharPointer();

        for (;;)
        {
            auto character = (uint32) t.getAndAdvance();

            if (character == 0)
                break;

            if (LegalCharLookupTable::isLegal (character))
            {
                outputStream << (char) character;
            }
            else
            {
                switch (character)
                {
                    case '&':   outputStream << "&amp;"; break;
                    case '"':   outputStream << "&quot;"; break;
                    case '>':   outputStream << "&gt;"; break;
                    case '<':   outputStream << "&lt;"; break;

                    case '\n':
                    case '\r':
                        if (! changeNewLines)
                        {
                            outputStream << (char) character;
                            break;
                        }
                        JUCE_FALLTHROUGH
                    default:
                        outputStream << "&#" << ((int) character) << ';';
                        break;
                }
            }
        }
    }

    static void writeSpaces (OutputStream& out, const size_t numSpaces)
    {
        out.writeRepeatedByte (' ', numSpaces);
    }
}

void XmlElement::writeElementAsText (OutputStream& outputStream,
                                     int indentationLevel,
                                     int lineWrapLength,
                                     const char* newLineChars) const
{
    if (indentationLevel >= 0)
        XmlOutputFunctions::writeSpaces (outputStream, (size_t) indentationLevel);

    if (! isTextElement())
    {
        outputStream.writeByte ('<');
        outputStream << tagName;

        {
            auto attIndent = (size_t) (indentationLevel + tagName.length() + 1);
            int lineLen = 0;

            for (const auto& [name, value] : getAttributeIterator())
            {
                if (lineLen > lineWrapLength && indentationLevel >= 0)
                {
                    outputStream << newLineChars;
                    XmlOutputFunctions::writeSpaces (outputStream, attIndent);
                    lineLen = 0;
                }

                auto startPos = outputStream.getPosition();
                outputStream.writeByte (' ');
                outputStream << name;
                outputStream.write ("=\"", 2);
                XmlOutputFunctions::escapeIllegalXmlChars (outputStream, value, true);
                outputStream.writeByte ('"');
                lineLen += (int) (outputStream.getPosition() - startPos);
            }
        }

        if (auto* child = firstChildElement.get())
        {
            outputStream.writeByte ('>');
            bool lastWasTextNode = false;

            for (; child != nullptr; child = child->nextListItem)
            {
                if (child->isTextElement())
                {
                    XmlOutputFunctions::escapeIllegalXmlChars (outputStream, child->getText(), false);
                    lastWasTextNode = true;
                }
                else
                {
                    if (indentationLevel >= 0 && ! lastWasTextNode)
                        outputStream << newLineChars;

                    child->writeElementAsText (outputStream,
                                               lastWasTextNode ? 0 : (indentationLevel + (indentationLevel >= 0 ? 2 : 0)), lineWrapLength,
                                               newLineChars);
                    lastWasTextNode = false;
                }
            }

            if (indentationLevel >= 0 && ! lastWasTextNode)
            {
                outputStream << newLineChars;
                XmlOutputFunctions::writeSpaces (outputStream, (size_t) indentationLevel);
            }

            outputStream.write ("</", 2);
            outputStream << tagName;
            outputStream.writeByte ('>');
        }
        else
        {
            outputStream.write ("/>", 2);
        }
    }
    else
    {
        XmlOutputFunctions::escapeIllegalXmlChars (outputStream, getText(), false);
    }
}

XmlElement::TextFormat::TextFormat() {}

XmlElement::TextFormat XmlElement::TextFormat::singleLine() const
{
    auto f = *this;
    f.newLineChars = nullptr;
    return f;
}

XmlElement::TextFormat XmlElement::TextFormat::withoutHeader() const
{
    auto f = *this;
    f.addDefaultHeader = false;
    return f;
}

String XmlElement::toString (const TextFormat& options) const
{
    MemoryOutputStream mem (2048);
    writeTo (mem, options);
    return mem.toUTF8();
}

void XmlElement::writeTo (OutputStream& output, const TextFormat& options) const
{
    if (options.customHeader.isNotEmpty())
    {
        output << options.customHeader;

        if (options.newLineChars == nullptr)
            output.writeByte (' ');
        else
            output << options.newLineChars
                   << options.newLineChars;
    }
    else if (options.addDefaultHeader)
    {
        output << "<?xml version=\"1.0\" encoding=\"";

        if (options.customEncoding.isNotEmpty())
            output << options.customEncoding;
        else
            output << "UTF-8";

        output << "\"?>";

        if (options.newLineChars == nullptr)
            output.writeByte (' ');
        else
            output << options.newLineChars
                   << options.newLineChars;
    }

    if (options.dtd.isNotEmpty())
    {
        output << options.dtd;

        if (options.newLineChars == nullptr)
            output.writeByte (' ');
        else
            output << options.newLineChars;
    }

    writeElementAsText (output, options.newLineChars == nullptr ? -1 : 0,
                        options.lineWrapLength,
                        options.newLineChars);

    if (options.newLineChars != nullptr)
        output << options.newLineChars;
}

bool XmlElement::writeTo (const File& destinationFile, const TextFormat& options) const
{
    TemporaryFile tempFile (destinationFile);

    {
        FileOutputStream out (tempFile.getFile());

        if (! out.openedOk())
            return false;

        writeTo (out, options);
        out.flush(); // (called explicitly to force an fsync on posix)

        if (out.getStatus().failed())
            return false;
    }

    return tempFile.overwriteTargetFileWithTemporary();
}

String XmlElement::createDocument (StringRef dtdToUse, bool allOnOneLine, bool includeXmlHeader,
                                   StringRef encodingType, int lineWrapLength) const
{
    TextFormat options;
    options.dtd = dtdToUse;
    options.customEncoding = encodingType;
    options.addDefaultHeader = includeXmlHeader;
    options.lineWrapLength = lineWrapLength;

    if (allOnOneLine)
        options.newLineChars = nullptr;

    return toString (options);
}

void XmlElement::writeToStream (OutputStream& output, StringRef dtdToUse,
                                bool allOnOneLine, bool includeXmlHeader,
                                StringRef encodingType, int lineWrapLength) const
{
    TextFormat options;
    options.dtd = dtdToUse;
    options.customEncoding = encodingType;
    options.addDefaultHeader = includeXmlHeader;
    options.lineWrapLength = lineWrapLength;

    if (allOnOneLine)
        options.newLineChars = nullptr;

    writeTo (output, options);
}

bool XmlElement::writeToFile (const File& file, StringRef dtdToUse,
                              StringRef encodingType, int lineWrapLength) const
{
    TextFormat options;
    options.dtd = dtdToUse;
    options.customEncoding = encodingType;
    options.lineWrapLength = lineWrapLength;

    return writeTo (file, options);
}

//==============================================================================
bool XmlElement::hasTagName (StringRef possibleTagName) const noexcept
{
    const bool matches = tagName.equalsIgnoreCase (possibleTagName);

    // XML tags should be case-sensitive, so although this method allows a
    // case-insensitive match to pass, you should try to avoid this.
    jassert ((! matches) || tagName == possibleTagName);

    return matches;
}

String XmlElement::getNamespace() const
{
    return tagName.upToFirstOccurrenceOf (":", false, false);
}

String XmlElement::getTagNameWithoutNamespace() const
{
    return tagName.fromLastOccurrenceOf (":", false, false);
}

bool XmlElement::hasTagNameIgnoringNamespace (StringRef possibleTagName) const
{
    return hasTagName (possibleTagName) || getTagNameWithoutNamespace() == possibleTagName;
}

XmlElement* XmlElement::getNextElementWithTagName (StringRef requiredTagName) const
{
    auto* e = nextListItem.get();

    while (e != nullptr && ! e->hasTagName (requiredTagName))
        e = e->nextListItem;

    return e;
}

void XmlElement::setTagName (StringRef newTagName)
{
    jassert (isValidXmlName (newTagName));
    tagName = StringPool::getGlobalPool().getPooledString (newTagName);
}

//==============================================================================
int XmlElement::getNumAttributes() const noexcept
{
    return attributes.size();
}

static const String& getEmptyStringRef() noexcept
{
    static String empty;
    return empty;
}

const String& XmlElement::getAttributeName (const int index) const noexcept
{
    if (auto* att = attributes[index].get())
        return att->attribute.name.toString();

    return getEmptyStringRef();
}

const String& XmlElement::getAttributeValue (const int index) const noexcept
{
    if (auto* att = attributes[index].get())
        return att->attribute.value;

    return getEmptyStringRef();
}

const XmlAttribute* XmlElement::getAttribute (StringRef attributeName) const noexcept
{
    for (const auto& att : getAttributeIterator())
        if (att.name == attributeName)
            return &att;

    return nullptr;
}

bool XmlElement::hasAttribute (StringRef attributeName) const noexcept
{
    return getAttribute (attributeName) != nullptr;
}

//==============================================================================
const String& XmlElement::getStringAttribute (StringRef attributeName) const noexcept
{
    if (auto* att = getAttribute (attributeName))
        return att->value;

    return getEmptyStringRef();
}

String XmlElement::getStringAttribute (StringRef attributeName, const String& defaultReturnValue) const
{
    if (auto* att = getAttribute (attributeName))
        return att->value;

    return defaultReturnValue;
}

int XmlElement::getIntAttribute (StringRef attributeName, const int defaultReturnValue) const
{
    if (auto* att = getAttribute (attributeName))
        return att->value.getIntValue();

    return defaultReturnValue;
}

double XmlElement::getDoubleAttribute (StringRef attributeName, const double defaultReturnValue) const
{
    if (auto* att = getAttribute (attributeName))
        return att->value.getDoubleValue();

    return defaultReturnValue;
}

bool XmlElement::getBoolAttribute (StringRef attributeName, const bool defaultReturnValue) const
{
    if (auto* att = getAttribute (attributeName))
    {
        auto firstChar = *(att->value.getCharPointer().findEndOfWhitespace());

        return firstChar == '1'
            || firstChar == 't'
            || firstChar == 'y'
            || firstChar == 'T'
            || firstChar == 'Y';
    }

    return defaultReturnValue;
}

bool XmlElement::compareAttribute (StringRef attributeName,
                                   StringRef stringToCompareAgainst,
                                   const bool ignoreCase) const noexcept
{
    if (auto* att = getAttribute (attributeName))
        return att->equals (attributeName, stringToCompareAgainst, ignoreCase);

    return false;
}

bool XmlElement::compareAttribute (const XmlAttribute& other, const bool ignoreCase) const noexcept
{
    return compareAttribute (other.name, other.value, ignoreCase);
}

//==============================================================================
void XmlElement::setAttribute (const Identifier& attributeName, const String& value)
{
    if (attributes == nullptr)
    {
        attributes = new XmlAttributeNode (attributeName, value);
    }
    else
    {
        for (auto* att = attributes.get(); ; att = att->nextListItem)
        {
            if (att->attribute.name == attributeName)
            {
                att->attribute.value = value;
                break;
            }

            if (att->nextListItem == nullptr)
            {
                att->nextListItem = new XmlAttributeNode (attributeName, value);
                break;
            }
        }
    }
}

void XmlElement::setAttribute (const Identifier& attributeName, const int number)
{
    setAttribute (attributeName, String (number));
}

void XmlElement::setAttribute (const Identifier& attributeName, const double number)
{
    setAttribute (attributeName, serialiseDouble (number));
}

void XmlElement::removeAttribute (const Identifier& attributeName) noexcept
{
    for (auto* att = &attributes; att->get() != nullptr; att = &(att->get()->nextListItem))
    {
        if (att->get()->attribute.name == attributeName)
        {
            delete att->removeNext();
            break;
        }
    }
}

void XmlElement::removeAllAttributes() noexcept
{
    attributes.deleteAll();
}

//==============================================================================
int XmlElement::getNumChildElements() const noexcept
{
    return firstChildElement.size();
}

XmlElement* XmlElement::getChildElement (const int index) const noexcept
{
    return firstChildElement[index].get();
}

XmlElement* XmlElement::getChildByName (StringRef childName) const noexcept
{
    jassert (! childName.isEmpty());

    for (auto* child = firstChildElement.get(); child != nullptr; child = child->nextListItem)
        if (child->hasTagName (childName))
            return child;

    return nullptr;
}

XmlElement* XmlElement::getChildByAttribute (StringRef attributeName, StringRef attributeValue) const noexcept
{
    jassert (! attributeName.isEmpty());

    for (auto* child = firstChildElement.get(); child != nullptr; child = child->nextListItem)
        if (child->compareAttribute (attributeName, attributeValue))
            return child;

    return nullptr;
}

void XmlElement::addChildElement (XmlElement* const newNode) noexcept
{
    if (newNode != nullptr)
    {
        // The element being added must not be a child of another node!
        jassert (newNode->nextListItem == nullptr);

        firstChildElement.append (newNode);
    }
}

void XmlElement::insertChildElement (XmlElement* const newNode, int indexToInsertAt) noexcept
{
    if (newNode != nullptr)
    {
        // The element being added must not be a child of another node!
        jassert (newNode->nextListItem == nullptr);

        firstChildElement.insertAtIndex (indexToInsertAt, newNode);
    }
}

void XmlElement::prependChildElement (XmlElement* newNode) noexcept
{
    if (newNode != nullptr)
    {
        // The element being added must not be a child of another node!
        jassert (newNode->nextListItem == nullptr);

        firstChildElement.insertNext (newNode);
    }
}

XmlElement* XmlElement::createNewChildElement (StringRef childTagName)
{
    auto newElement = new XmlElement (childTagName);
    addChildElement (newElement);
    return newElement;
}

bool XmlElement::replaceChildElement (XmlElement* const currentChildElement,
                                      XmlElement* const newNode) noexcept
{
    if (newNode != nullptr)
    {
        if (auto* p = firstChildElement.findPointerTo (currentChildElement))
        {
            if (currentChildElement != newNode)
                delete p->replaceNext (newNode);

            return true;
        }
    }

    return false;
}

void XmlElement::removeChildElement (XmlElement* const childToRemove,
                                     const bool shouldDeleteTheChild) noexcept
{
    if (childToRemove != nullptr)
    {
        jassert (containsChildElement (childToRemove));

        firstChildElement.remove (childToRemove);

        if (shouldDeleteTheChild)
            delete childToRemove;
    }
}

bool XmlElement::isEquivalentTo (const XmlElement* const other,
                                 const bool ignoreOrderOfAttributes) const noexcept
{
    if (this != other)
    {
        if (other == nullptr || tagName != other->tagName)
            return false;

        if (ignoreOrderOfAttributes)
        {
            int totalAtts = 0;

            for (auto* att = attributes.get(); att != nullptr; att = att->nextListItem)
            {
                if (! other->compareAttribute (att->attribute))
                    return false;

                ++totalAtts;
            }

            if (totalAtts != other->getNumAttributes())
                return false;
        }
        else
        {
            auto* thisAtt = attributes.get();
            auto* otherAtt = other->attributes.get();

            for (;;)
            {
                if (thisAtt == nullptr || otherAtt == nullptr)
                {
                    if (thisAtt == otherAtt) // both nullptr, so it's a match
                        break;

                    return false;
                }

                if (thisAtt->attribute != otherAtt->attribute)
                    return false;

                thisAtt = thisAtt->nextListItem;
                otherAtt = otherAtt->nextListItem;
            }
        }

        auto* thisChild = firstChildElement.get();
        auto* otherChild = other->firstChildElement.get();

        for (;;)
        {
            if (thisChild == nullptr || otherChild == nullptr)
            {
                if (thisChild == otherChild) // both 0, so it's a match
                    break;

                return false;
            }

            if (! thisChild->isEquivalentTo (otherChild, ignoreOrderOfAttributes))
                return false;

            thisChild = thisChild->nextListItem;
            otherChild = otherChild->nextListItem;
        }
    }

    return true;
}

void XmlElement::deleteAllChildElements() noexcept
{
    firstChildElement.deleteAll();
}

void XmlElement::deleteAllChildElementsWithTagName (StringRef name) noexcept
{
    for (auto* child = firstChildElement.get(); child != nullptr;)
    {
        auto* nextChild = child->nextListItem.get();

        if (child->hasTagName (name))
            removeChildElement (child, true);

        child = nextChild;
    }
}

bool XmlElement::containsChildElement (const XmlElement* const possibleChild) const noexcept
{
    return firstChildElement.contains (possibleChild);
}

XmlElement* XmlElement::findParentElementOf (const XmlElement* const elementToLookFor) noexcept
{
    if (this == elementToLookFor || elementToLookFor == nullptr)
        return nullptr;

    for (auto* child = firstChildElement.get(); child != nullptr; child = child->nextListItem)
    {
        if (elementToLookFor == child)
            return this;

        if (auto* found = child->findParentElementOf (elementToLookFor))
            return found;
    }

    return nullptr;
}

void XmlElement::getChildElementsAsArray (XmlElement** elems) const noexcept
{
    firstChildElement.copyToArray (elems);
}

void XmlElement::reorderChildElements (XmlElement** elems, int num) noexcept
{
    auto* e = elems[0];
    firstChildElement = e;

    for (int i = 1; i < num; ++i)
    {
        e->nextListItem = elems[i];
        e = e->nextListItem;
    }

    e->nextListItem = nullptr;
}

//==============================================================================
bool XmlElement::isTextElement() const noexcept
{
    return tagName.isEmpty();
}

static const String& getJuceXmlTextContentAttributeName()
{
    static String result { "text" };
    return result;
}

const String& XmlElement::getText() const noexcept
{
    jassert (isTextElement());  // you're trying to get the text from an element that
                                // isn't actually a text element.. If this contains text sub-nodes, you
                                // probably want to use getAllSubText instead.

    return getStringAttribute (getJuceXmlTextContentAttributeName());
}

void XmlElement::setText (const String& newText)
{
    if (isTextElement())
        setAttribute (getJuceXmlTextContentAttributeName(), newText);
    else
        jassertfalse; // you can only change the text in a text element, not a normal one.
}

String XmlElement::getAllSubText() const
{
    if (isTextElement())
        return getText();

    if (getNumChildElements() == 1)
        return firstChildElement.get()->getAllSubText();

    MemoryOutputStream mem (1024);

    for (auto* child = firstChildElement.get(); child != nullptr; child = child->nextListItem)
        mem << child->getAllSubText();

    return mem.toUTF8();
}

String XmlElement::getChildElementAllSubText (StringRef childTagName, const String& defaultReturnValue) const
{
    if (auto* child = getChildByName (childTagName))
        return child->getAllSubText();

    return defaultReturnValue;
}

XmlElement* XmlElement::createTextElement (const String& text)
{
    auto e = new XmlElement ((int) 0);
    e->setAttribute (getJuceXmlTextContentAttributeName(), text);
    return e;
}

bool XmlElement::isValidXmlName (StringRef text) noexcept
{
    if (text.isEmpty() || ! isValidXmlNameStartCharacter (text.text.getAndAdvance()))
        return false;

    for (;;)
    {
        if (text.isEmpty())
            return true;

        if (! isValidXmlNameBodyCharacter (text.text.getAndAdvance()))
            return false;
    }
}

void XmlElement::addTextElement (const String& text)
{
    addChildElement (createTextElement (text));
}

void XmlElement::deleteAllTextElements() noexcept
{
    for (auto* child = firstChildElement.get(); child != nullptr;)
    {
        auto* next = child->nextListItem.get();

        if (child->isTextElement())
            removeChildElement (child, true);

        child = next;
    }
}

//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

class XmlElementTests final : public UnitTest
{
public:
    XmlElementTests()
        : UnitTest ("XmlElement", UnitTestCategories::xml)
    {}

    void runTest() override
    {
        {
            beginTest ("Float formatting");

            auto element = std::make_unique<XmlElement> ("test");
            Identifier number ("number");

            std::map<double, String> tests;
            tests[1] = "1.0";
            tests[1.1] = "1.1";
            tests[1.01] = "1.01";
            tests[0.76378] = "0.76378";
            tests[-10] = "-10.0";
            tests[10.01] = "10.01";
            tests[0.0123] = "0.0123";
            tests[-3.7e-27] = "-3.7e-27";
            tests[1e+40] = "1.0e40";
            tests[-12345678901234567.0] = "-1.234567890123457e16";
            tests[192000] = "192000.0";
            tests[1234567] = "1.234567e6";
            tests[0.00006] = "0.00006";
            tests[0.000006] = "6.0e-6";

            for (auto& test : tests)
            {
                element->setAttribute (number, test.first);
                expectEquals (element->getStringAttribute (number), test.second);
            }
        }
    }
};

static XmlElementTests xmlElementTests;

#endif

} // namespace juce
