1 /*

     2  * Copyright 2005 Frerich Raabe <raabe@kde.org>

     3  * Copyright (C) 2006 Apple Computer, Inc.

     4  *

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

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  * 

     9  * 1. Redistributions of source code must retain the above copyright

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

    11  * 2. Redistributions in binary form must reproduce the above copyright

    12  *    notice, this list of conditions and the following disclaimer in the

    13  *    documentation and/or other materials provided with the distribution.

    14  * 

    15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

    16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

    17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

    18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

    19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

    20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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

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

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

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

    25  */

    26 

    27 #ifndef XPathExpressionNode_h

    28 #define XPathExpressionNode_h

    29 

    30 #if ENABLE(XPATH)

    31 

    32 #include "StringHash.h"

    33 #include <wtf/HashMap.h>

    34 #include <wtf/Vector.h>

    35 

    36 namespace WebCore {

    37 

    38     class Node;

    39 

    40     namespace XPath {

    41 

    42         class Value;

    43         

    44         struct EvaluationContext {

    45             EvaluationContext() : node(0), size(0), position(0) { }

    46 

    47             RefPtr<Node> node;

    48             unsigned long size;

    49             unsigned long position;

    50             HashMap<String, String> variableBindings;

    51 

    52         };

    53 

    54         class ParseNode {

    55         public:

    56             virtual ~ParseNode() { }

    57         };

    58 

    59         class Expression : public ParseNode, Noncopyable {

    60         public:

    61             static EvaluationContext& evaluationContext();

    62 

    63             Expression();

    64             virtual ~Expression();

    65 

    66             virtual Value evaluate() const = 0;

    67 

    68             void addSubExpression(Expression* expr) { m_subExpressions.append(expr); }

    69 

    70         protected:

    71             unsigned subExprCount() const { return m_subExpressions.size(); }

    72             Expression* subExpr(unsigned i) { return m_subExpressions[i]; }

    73             const Expression* subExpr(unsigned i) const { return m_subExpressions[i]; }

    74 

    75         private:

    76             Vector<Expression*> m_subExpressions;

    77         };

    78 

    79     }

    80 

    81 }

    82 

    83 #endif // ENABLE(XPATH)

    84 

    85 #endif // EXPRESSION_H

    86