/*

 * Copyright (C) 2009 Google Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above

 * copyright notice, this list of conditions and the following disclaimer

 * in the documentation and/or other materials provided with the

 * distribution.

 *     * Neither the name of Google Inc. nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#if ENABLE(RUBY)

#include "RenderRuby.h"

#include "RenderRubyRun.h"

namespace WebCore {

//=== generic helper functions to avoid excessive code duplication ===

static RenderRubyRun* lastRubyRun(const RenderObject* ruby)

{

    RenderObject* child = ruby->lastChild();

    if (child && ruby->isAfterContent(child))

        child = child->previousSibling();

    ASSERT(!child || child->isRubyRun());

    return static_cast<RenderRubyRun*>(child);

}

static inline RenderRubyRun* findRubyRunParent(RenderObject* child)

{

    while (child && !child->isRubyRun())

        child = child->parent();

    return static_cast<RenderRubyRun*>(child);

}

//=== ruby as inline object ===

RenderRubyAsInline::RenderRubyAsInline(Node* node)

    : RenderInline(node)

{

}

RenderRubyAsInline::~RenderRubyAsInline()

{

}

bool RenderRubyAsInline::isChildAllowed(RenderObject* child, RenderStyle*) const

{

    return child->isRubyText()

        || child->isRubyRun()

        || child->isInline();

}

void RenderRubyAsInline::addChild(RenderObject* child, RenderObject* beforeChild)

{

    // Note: ':after' content is handled implicitely below

    // if child is a ruby run, just add it normally

    if (child->isRubyRun()) {

        RenderInline::addChild(child, beforeChild);

        return;

    }

    if (beforeChild && !isAfterContent(beforeChild)) {

        // insert child into run

        ASSERT(!beforeChild->isRubyRun());

        RenderRubyRun* run = findRubyRunParent(beforeChild);

        ASSERT(run); // beforeChild should always have a run as parent

        if (run) {

            run->addChild(child, beforeChild);

            return;

        }

        ASSERT(false); // beforeChild should always have a run as parent!

        // Emergency fallback: fall through and just append.

    }

    // If the new child would be appended, try to add the child to the previous run

    // if possible, or create a new run otherwise.

    // (The RenderRubyRun object will handle the details)

    RenderRubyRun* lastRun = lastRubyRun(this);

    if (!lastRun || lastRun->hasRubyText()) {

        lastRun = RenderRubyRun::staticCreateRubyRun(this);

        RenderInline::addChild(lastRun);

    }

    lastRun->addChild(child);

}

void RenderRubyAsInline::removeChild(RenderObject* child)

{

    // If the child's parent is *this, i.e. a ruby run or ':after' content,

    // just use the normal remove method.

    if (child->parent() == this) {

        ASSERT(child->isRubyRun() || child->isAfterContent());

        RenderInline::removeChild(child);

        return;

    }

    // Find the containing run

    RenderRubyRun* run = findRubyRunParent(child);

    ASSERT(run);

    run->removeChild(child);

}

//=== ruby as block object ===

RenderRubyAsBlock::RenderRubyAsBlock(Node* node)

    : RenderBlock(node)

{

}

RenderRubyAsBlock::~RenderRubyAsBlock()

{

}

bool RenderRubyAsBlock::isChildAllowed(RenderObject* child, RenderStyle*) const

{

    return child->isRubyText()

        || child->isRubyRun()

        || child->isInline();

}

void RenderRubyAsBlock::addChild(RenderObject* child, RenderObject* beforeChild)

{

    // Note: ':after' content is handled implicitely below

    // if child is a ruby run, just add it normally

    if (child->isRubyRun()) {

        RenderBlock::addChild(child, beforeChild);

        return;

    }

    if (beforeChild && !isAfterContent(beforeChild)) {

        // insert child into run

        ASSERT(!beforeChild->isRubyRun());

        RenderObject* run = beforeChild;

        while (run && !run->isRubyRun())

            run = run->parent();

        if (run) {

            run->addChild(child, beforeChild);

            return;

        }

        ASSERT(false); // beforeChild should always have a run as parent!

        // Emergency fallback: fall through and just append.

    }

    // If the new child would be appended, try to add the child to the previous run

    // if possible, or create a new run otherwise.

    // (The RenderRubyRun object will handle the details)

    RenderRubyRun* lastRun = lastRubyRun(this);

    if (!lastRun || lastRun->hasRubyText()) {

        lastRun = RenderRubyRun::staticCreateRubyRun(this);

        RenderBlock::addChild(lastRun);

    }

    lastRun->addChild(child);

}

void RenderRubyAsBlock::removeChild(RenderObject* child)

{

    // If the child's parent is *this, just use the normal remove method.

    if (child->parent() == this) {

        // This should happen only during destruction of the whole ruby element, though.

        RenderBlock::removeChild(child);

        return;

    }

    // Find the containing run

    RenderRubyRun* run = findRubyRunParent(child);

    ASSERT(run);

    run->removeChild(child);

}

} // namespace WebCore

#endif // ENABLE(RUBY)