cmbinaryop.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 192 行

/*
 * Copyright 1999-2001,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Log: CMBinaryOp.cpp,v $
 * Revision 1.7  2004/09/08 13:56:51  peiyongz
 * Apache License Version 2.0
 *
 * Revision 1.6  2003/12/17 00:18:38  cargilld
 * Update to memory management so that the static memory manager (one used to call Initialize) is only for static data.
 *
 * Revision 1.5  2003/11/20 18:12:20  knoaman
 * Use a bitwise operation to check the node type.
 *
 * Revision 1.4  2003/11/07 17:08:11  knoaman
 * For PSVI support, distinguish wildcard elements with namespace lists.
 *
 * Revision 1.3  2003/05/15 18:48:27  knoaman
 * Partial implementation of the configurable memory manager.
 *
 * Revision 1.2  2002/11/04 14:54:58  tng
 * C++ Namespace Support.
 *
 * Revision 1.1.1.1  2002/02/01 22:22:37  peiyongz
 * sane_include
 *
 * Revision 1.3  2001/05/11 13:27:15  tng
 * Copyright update.
 *
 * Revision 1.2  2001/02/16 14:58:57  tng
 * Schema: Update Makefile, configure files, project files, and include path in
 * certain cpp files because of the move of the common Content Model files.  By Pei Yong Zhang.
 *
 * Revision 1.1  2001/02/16 14:17:29  tng
 * Schema: Move the common Content Model files that are shared by DTD
 * and schema from 'DTD' folder to 'common' folder.  By Pei Yong Zhang.
 *
 * Revision 1.3  2000/03/02 19:55:37  roddey
 * This checkin includes many changes done while waiting for the
 * 1.1.0 code to be finished. I can't list them all here, but a list is
 * available elsewhere.
 *
 * Revision 1.2  2000/02/09 21:42:36  abagchi
 * Copyright swatswat
 *
 * Revision 1.1.1.1  1999/11/09 01:03:00  twl
 * Initial checkin
 *
 * Revision 1.2  1999/11/08 20:45:35  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/util/XercesDefs.hpp>
#include <xercesc/util/RuntimeException.hpp>
#include <xercesc/validators/common/ContentSpecNode.hpp>
#include <xercesc/validators/common/CMBinaryOp.hpp>
#include <xercesc/validators/common/CMStateSet.hpp>

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  CMBinaryOp: Constructors
// ---------------------------------------------------------------------------
CMBinaryOp::CMBinaryOp( const ContentSpecNode::NodeTypes type
                        ,     CMNode* const              leftToAdopt
                        ,     CMNode* const              rightToAdopt
                        ,     MemoryManager* const       manager) :
    CMNode(type, manager)
    , fLeftChild(leftToAdopt)
    , fRightChild(rightToAdopt)
{
    // Insure that its one of the types we require
    if (((type & 0x0f) != ContentSpecNode::Choice)
    &&  ((type & 0x0f) != ContentSpecNode::Sequence))
    {
        ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::CM_BinOpHadUnaryType, manager);
    }
}

CMBinaryOp::~CMBinaryOp()
{
    delete fLeftChild;
    delete fRightChild;
}


// ---------------------------------------------------------------------------
//  CMBinaryOp: Getter methods
// ---------------------------------------------------------------------------
const CMNode* CMBinaryOp::getLeft() const
{
    return fLeftChild;
}

CMNode* CMBinaryOp::getLeft()
{
    return fLeftChild;
}

const CMNode* CMBinaryOp::getRight() const
{
    return fRightChild;
}

CMNode* CMBinaryOp::getRight()
{
    return fRightChild;
}


// ---------------------------------------------------------------------------
//  CMBinaryOp: Implementation of the public CMNode virtual interface
// ---------------------------------------------------------------------------
bool CMBinaryOp::isNullable() const
{
    //
    //  If its an alternation, then if either child is nullable then
    //  this node is nullable. If its a concatenation, then both of
    //  them have to be nullable.
    //
    if ((getType() & 0x0f) == ContentSpecNode::Choice)
        return (fLeftChild->isNullable() || fRightChild->isNullable());

    return (fLeftChild->isNullable() && fRightChild->isNullable());
}


// ---------------------------------------------------------------------------
//  CMBinaryOp: Implementation of the protected CMNode virtual interface
// ---------------------------------------------------------------------------
void CMBinaryOp::calcFirstPos(CMStateSet& toSet) const
{
    if ((getType() & 0x0f) == ContentSpecNode::Choice)
    {
        // Its the the union of the first positions of our children.
        toSet = fLeftChild->getFirstPos();
        toSet |= fRightChild->getFirstPos();
    }
    else if ((getType() & 0x0f) == ContentSpecNode::Sequence)
    {
        //
        //  If our left child is nullable, then its the union of our
        //  children's first positions. Else is our left child's first
        //  positions.
        //
        toSet = fLeftChild->getFirstPos();
        if (fLeftChild->isNullable())
            toSet |= fRightChild->getFirstPos();
    }
}

void CMBinaryOp::calcLastPos(CMStateSet& toSet) const
{
    if ((getType() & 0x0f) == ContentSpecNode::Choice)
    {
        // Its the the union of the first positions of our children.
        toSet = fLeftChild->getLastPos();
        toSet |= fRightChild->getLastPos();
    }
    else if ((getType() & 0x0f) == ContentSpecNode::Sequence)
    {
        //
        //  If our right child is nullable, then its the union of our
        //  children's last positions. Else is our right child's last
        //  positions.
        //
        toSet = fRightChild->getLastPos();
        if (fRightChild->isNullable())
            toSet |= fLeftChild->getLastPos();
    }
}

XERCES_CPP_NAMESPACE_END