/**

 * This file is part of the DOM implementation for KDE.

 *

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 *           (C) 2001 Peter Kelly (pmk@post.com)

 *           (C) 2001 Dirk Mueller (mueller@kde.org)

 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#include "config.h"

#include "HashMap.h"

#include "StyledElement.h"

#include "CSSStyleSelector.h"

#include "CSSStyleSheet.h"

#include "CSSValueKeywords.h"

#include "Document.h"

#include "HTMLNames.h"

using namespace std;

namespace WebCore {

using namespace HTMLNames;

struct MappedAttributeKey {

    uint16_t type;

    StringImpl* name;

    StringImpl* value;

    MappedAttributeKey(MappedAttributeEntry t = eNone, StringImpl* n = 0, StringImpl* v = 0)

        : type(t), name(n), value(v) { }

    static MappedAttributeKey sDeletedValueKey;

};

MappedAttributeKey MappedAttributeKey::sDeletedValueKey(eLastEntry);

static inline bool operator==(const MappedAttributeKey& a, const MappedAttributeKey& b)

    { return a.type == b.type && a.name == b.name && a.value == b.value; } 

struct MappedAttributeKeyTraits : WTF::GenericHashTraits<MappedAttributeKey*> {

    static const bool emptyValueIsZero = true;

    static const bool needsDestruction = true;

    static MappedAttributeKey* deletedValue() { return &(MappedAttributeKey::sDeletedValueKey); }

};

struct MappedAttributeHash {

    static unsigned hash(const MappedAttributeKey*);

    static bool equal(const MappedAttributeKey* a, const MappedAttributeKey* b) { return *a == *b; }

};

//typedef HashMap<MappedAttributeKey, CSSMappedAttributeDeclaration*, MappedAttributeHash, MappedAttributeKeyTraits> MappedAttributeDecls;

typedef MappedAttributeKey* MappedAttributeKeyPtr;

typedef HashMap<MappedAttributeKeyPtr, CSSMappedAttributeDeclaration*, MappedAttributeHash, MappedAttributeKeyTraits> MappedAttributeDecls;

static MappedAttributeDecls* mappedAttributeDecls = 0;

CSSMappedAttributeDeclaration* StyledElement::getMappedAttributeDecl(MappedAttributeEntry entryType, Attribute* attr)

{

    if (!mappedAttributeDecls)

        return 0;

    MappedAttributeKey* key = new MappedAttributeKey(entryType, attr->name().localName().impl(), attr->value().impl());

    CSSMappedAttributeDeclaration* value = mappedAttributeDecls->get( key );

    delete key;

    return value;

}

void StyledElement::setMappedAttributeDecl(MappedAttributeEntry entryType, Attribute* attr, CSSMappedAttributeDeclaration* decl)

{

    if (!mappedAttributeDecls)

        mappedAttributeDecls = new MappedAttributeDecls;

    mappedAttributeDecls->set(new MappedAttributeKey(entryType, attr->name().localName().impl(), attr->value().impl()), decl);

}

void StyledElement::removeMappedAttributeDecl(MappedAttributeEntry entryType,

                                                  const QualifiedName& attrName, const AtomicString& attrValue)

{

    if (!mappedAttributeDecls)

        return;

    MappedAttributeKey* key = new MappedAttributeKey(entryType, attrName.localName().impl(), attrValue.impl());

    mappedAttributeDecls->remove(key);

    delete key;

}

void StyledElement::invalidateStyleAttribute()

{

    m_isStyleAttributeValid = false;

}

void StyledElement::updateStyleAttributeIfNeeded() const

{

    if (!m_isStyleAttributeValid) {

        m_isStyleAttributeValid = true;

        m_synchronizingStyleAttribute = true;

        if (m_inlineStyleDecl)

            const_cast<StyledElement*>(this)->setAttribute(styleAttr, m_inlineStyleDecl->cssText());

        m_synchronizingStyleAttribute = false;

    }

}

inline static bool isClassWhitespace(UChar c)

{

    return c == ' ' || c == '\r' || c == '\n' || c == '\t';

}

StyledElement::StyledElement(const QualifiedName& name, Document *doc)

    : Element(name, doc)

{

    m_isStyleAttributeValid = true;

    m_synchronizingStyleAttribute = false;

}

StyledElement::~StyledElement()

{

    destroyInlineStyleDecl();

}

Attribute* StyledElement::createAttribute(const QualifiedName& name, StringImpl* value)

{

    return new MappedAttribute(name, value);

}

void StyledElement::createInlineStyleDecl()

{

    m_inlineStyleDecl = new CSSMutableStyleDeclaration;

    m_inlineStyleDecl->setParent(document()->elementSheet());

    m_inlineStyleDecl->setNode(this);

    m_inlineStyleDecl->setStrictParsing(!document()->inCompatMode());

}

void StyledElement::destroyInlineStyleDecl()

{

    if (m_inlineStyleDecl) {

        m_inlineStyleDecl->setNode(0);

        m_inlineStyleDecl->setParent(0);

        m_inlineStyleDecl = 0;

    }

}

void StyledElement::attributeChanged(Attribute* attr, bool preserveDecls)

{

    MappedAttribute* mappedAttr = static_cast<MappedAttribute*>(attr);

    if (mappedAttr->decl() && !preserveDecls) {

        mappedAttr->setDecl(0);

        setChanged();

        if (namedAttrMap)

            mappedAttributes()->declRemoved();

    }

    bool checkDecl = true;

    MappedAttributeEntry entry;

    bool needToParse = mapToEntry(attr->name(), entry);

    if (preserveDecls) {

        if (mappedAttr->decl()) {

            setChanged();

            if (namedAttrMap)

                mappedAttributes()->declAdded();

            checkDecl = false;

        }

    }

    else if (!attr->isNull() && entry != eNone) {

        CSSMappedAttributeDeclaration* decl = getMappedAttributeDecl(entry, attr);

        if (decl) {

            mappedAttr->setDecl(decl);

            setChanged();

            if (namedAttrMap)

                mappedAttributes()->declAdded();

            checkDecl = false;

        } else

            needToParse = true;

    }

    if (needToParse)

        parseMappedAttribute(mappedAttr);

    if (entry == eNone && ownerDocument()->styleSelector()->hasSelectorForAttribute(attr->name().localName()))

        setChanged();

    if (checkDecl && mappedAttr->decl()) {

        // Add the decl to the table in the appropriate spot.

        setMappedAttributeDecl(entry, attr, mappedAttr->decl());

        mappedAttr->decl()->setMappedState(entry, attr->name(), attr->value());

        mappedAttr->decl()->setParent(0);

        mappedAttr->decl()->setNode(0);

        if (namedAttrMap)

            mappedAttributes()->declAdded();

    }

}

bool StyledElement::mapToEntry(const QualifiedName& attrName, MappedAttributeEntry& result) const

{

    result = eNone;

    if (attrName == styleAttr)

        return !m_synchronizingStyleAttribute;

    return true;

}

void StyledElement::parseMappedAttribute(MappedAttribute *attr)

{

    if (attr->name() == idAttr) {

        // unique id

        setHasID(!attr->isNull());

        if (namedAttrMap) {

            if (attr->isNull())

                namedAttrMap->setID(nullAtom);

            else if (document()->inCompatMode() && !attr->value().impl()->isLower())

                namedAttrMap->setID(AtomicString(attr->value().domString().lower()));

            else

                namedAttrMap->setID(attr->value());

        }

        setChanged();

    } else if (attr->name() == classAttr) {

        // class

        setHasClass(!attr->isNull());

        if (namedAttrMap)

            mappedAttributes()->parseClassAttribute(attr->value());

        setChanged();

    } else if (attr->name() == styleAttr) {

        if (attr->isNull())

            destroyInlineStyleDecl();

        else

            getInlineStyleDecl()->parseDeclaration(attr->value());

        m_isStyleAttributeValid = true;

        setChanged();

    }

}

void StyledElement::createAttributeMap() const

{

    namedAttrMap = new NamedMappedAttrMap(const_cast<StyledElement*>(this));

}

CSSMutableStyleDeclaration* StyledElement::getInlineStyleDecl()

{

    if (!m_inlineStyleDecl)

        createInlineStyleDecl();

    return m_inlineStyleDecl.get();

}

CSSStyleDeclaration* StyledElement::style()

{

    return getInlineStyleDecl();

}

CSSMutableStyleDeclaration* StyledElement::additionalAttributeStyleDecl()

{

    return 0;

}

const AtomicStringList* StyledElement::getClassList() const

{

    return namedAttrMap ? mappedAttributes()->getClassList() : 0;

}

static inline int toHex(UChar c) {

    return ((c >= '0' && c <= '9') ? (c - '0')

        : ((c >= 'a' && c <= 'f') ? (c - 'a' + 10)

        : (( c >= 'A' && c <= 'F') ? (c - 'A' + 10)

        : -1)));

}

void StyledElement::addCSSProperty(MappedAttribute* attr, int id, const String &value)

{

    if (!attr->decl()) createMappedDecl(attr);

    attr->decl()->setProperty(id, value, false);

}

void StyledElement::addCSSProperty(MappedAttribute* attr, int id, int value)

{

    if (!attr->decl()) createMappedDecl(attr);

    attr->decl()->setProperty(id, value, false);

}

void StyledElement::addCSSStringProperty(MappedAttribute* attr, int id, const String &value, CSSPrimitiveValue::UnitTypes type)

{

    if (!attr->decl()) createMappedDecl(attr);

    attr->decl()->setStringProperty(id, value, type, false);

}

void StyledElement::addCSSImageProperty(MappedAttribute* attr, int id, const String &URL)

{

    if (!attr->decl()) createMappedDecl(attr);

    attr->decl()->setImageProperty(id, URL, false);

}

void StyledElement::addCSSLength(MappedAttribute* attr, int id, const String &value)

{

    // FIXME: This function should not spin up the CSS parser, but should instead just figure out the correct

    // length unit and make the appropriate parsed value.

    if (!attr->decl()) createMappedDecl(attr);

    // strip attribute garbage..

    StringImpl* v = value.impl();

    if (v) {

        unsigned int l = 0;

        while (l < v->length() && (*v)[l] <= ' ')

            l++;

        for (; l < v->length(); l++) {

            UChar cc = (*v)[l];

            if (cc > '9' || (cc < '0' && cc != '*' && cc != '%' && cc != '.'))

                break;

        }

        if (l != v->length()) {

            attr->decl()->setLengthProperty(id, v->substring(0, l), false);

            return;

        }

    }

    attr->decl()->setLengthProperty(id, value, false);

}

/* color parsing that tries to match as close as possible IE 6. */

void StyledElement::addCSSColor(MappedAttribute* attr, int id, const String &c)

{

    // this is the only case no color gets applied in IE.

    if (!c.length())

        return;

    if (!attr->decl())

        createMappedDecl(attr);

    if (attr->decl()->setProperty(id, c, false))

        return;

    String color = c.copy();

    // not something that fits the specs.

    // we're emulating IEs color parser here. It maps transparent to black, otherwise it tries to build a rgb value

    // out of everyhting you put in. The algorithm is experimentally determined, but seems to work for all test cases I have.

    // the length of the color value is rounded up to the next

    // multiple of 3. each part of the rgb triple then gets one third

    // of the length.

    //

    // Each triplet is parsed byte by byte, mapping

    // each number to a hex value (0-9a-fA-F to their values

    // everything else to 0).

    //

    // The highest non zero digit in all triplets is remembered, and

    // used as a normalization point to normalize to values between 0

    // and 255.

    if (color.lower() != "transparent") {

        if (color[0] == '#')

            color.remove(0, 1);

        int basicLength = (color.length() + 2) / 3;

        if (basicLength > 1) {

            // IE ignores colors with three digits or less

            int colors[3] = { 0, 0, 0 };

            int component = 0;

            int pos = 0;

            int maxDigit = basicLength-1;

            while (component < 3) {

                // search forward for digits in the string

                int numDigits = 0;

                while (pos < (int)color.length() && numDigits < basicLength) {

                    int hex = toHex(color[pos]);

                    colors[component] = (colors[component] << 4);

                    if (hex > 0) {

                        colors[component] += hex;

                        maxDigit = min(maxDigit, numDigits);

                    }

                    numDigits++;

                    pos++;

                }

                while (numDigits++ < basicLength)

                    colors[component] <<= 4;

                component++;

            }

            maxDigit = basicLength - maxDigit;

            // normalize to 00-ff. The highest filled digit counts, minimum is 2 digits

            maxDigit -= 2;

            colors[0] >>= 4*maxDigit;

            colors[1] >>= 4*maxDigit;

            colors[2] >>= 4*maxDigit;

            // ASSERT(colors[0] < 0x100 && colors[1] < 0x100 && colors[2] < 0x100);

            color = String::format("#%02x%02x%02x", colors[0], colors[1], colors[2]);

            if (attr->decl()->setProperty(id, color, false))

                return;

        }

    }

    attr->decl()->setProperty(id, CSS_VAL_BLACK, false);

}

void StyledElement::createMappedDecl(MappedAttribute* attr)

{

    CSSMappedAttributeDeclaration* decl = new CSSMappedAttributeDeclaration(0);

    attr->setDecl(decl);

    decl->setParent(document()->elementSheet());

    decl->setNode(this);

    decl->setStrictParsing(false); // Mapped attributes are just always quirky.

}

// Golden ratio - arbitrary start value to avoid mapping all 0's to all 0's

// or anything like that.

const unsigned PHI = 0x9e3779b9U;

// Paul Hsieh's SuperFastHash

// http://www.azillionmonkeys.com/qed/hash.html

unsigned MappedAttributeHash::hash(const MappedAttributeKey* key_)

{

    const MappedAttributeKey& key = *key_;

    uint32_t hash = PHI;

    uint32_t tmp;

    const uint16_t* p;

    p = reinterpret_cast<const uint16_t*>(&key.name);

    hash += p[0];

    tmp = (p[1] << 11) ^ hash;

    hash = (hash << 16) ^ tmp;

    hash += hash >> 11;

    ASSERT(sizeof(key.name) == 4 || sizeof(key.name) == 8);

    if (sizeof(key.name) == 8) {

        p += 2;

        hash += p[0];

        tmp = (p[1] << 11) ^ hash;

        hash = (hash << 16) ^ tmp;

        hash += hash >> 11;

    }

    p = reinterpret_cast<const uint16_t*>(&key.value);

    hash += p[0];

    tmp = (p[1] << 11) ^ hash;

    hash = (hash << 16) ^ tmp;

    hash += hash >> 11;

    ASSERT(sizeof(key.value) == 4 || sizeof(key.value) == 8);

    if (sizeof(key.value) == 8) {

        p += 2;

        hash += p[0];

        tmp = (p[1] << 11) ^ hash;

        hash = (hash << 16) ^ tmp;

        hash += hash >> 11;

    }

    // Handle end case

    hash += key.type;

    hash ^= hash << 11;

    hash += hash >> 17;

    // Force "avalanching" of final 127 bits

    hash ^= hash << 3;

    hash += hash >> 5;

    hash ^= hash << 2;

    hash += hash >> 15;

    hash ^= hash << 10;

    // This avoids ever returning a hash code of 0, since that is used to

    // signal "hash not computed yet", using a value that is likely to be

    // effectively the same as 0 when the low bits are masked

    if (hash == 0)

        hash = 0x80000000;

    return hash;

}

void StyledElement::copyNonAttributeProperties(const Element *sourceElement)

{

    const StyledElement* source = static_cast<const StyledElement*>(sourceElement);

    if (!source->m_inlineStyleDecl)

        return;

    *getInlineStyleDecl() = *source->m_inlineStyleDecl;

    m_isStyleAttributeValid = source->m_isStyleAttributeValid;

    m_synchronizingStyleAttribute = source->m_synchronizingStyleAttribute;

    Element::copyNonAttributeProperties(sourceElement);

}

}