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      1 /*
      2  * Copyright (C) 2005 Frerich Raabe <raabe (at) kde.org>
      3  * Copyright (C) 2006, 2009 Apple 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 XPathPath_h
     28 #define XPathPath_h
     29 
     30 #include "core/xml/XPathExpressionNode.h"
     31 #include "core/xml/XPathNodeSet.h"
     32 
     33 namespace WebCore {
     34 
     35     namespace XPath {
     36 
     37         class Predicate;
     38         class Step;
     39 
     40         class Filter : public Expression {
     41         public:
     42             Filter(Expression*, const Vector<Predicate*>& = Vector<Predicate*>());
     43             virtual ~Filter();
     44 
     45             virtual Value evaluate() const;
     46 
     47         private:
     48             virtual Value::Type resultType() const { return Value::NodeSetValue; }
     49 
     50             Expression* m_expr;
     51             Vector<Predicate*> m_predicates;
     52         };
     53 
     54         class LocationPath : public Expression {
     55         public:
     56             LocationPath();
     57             virtual ~LocationPath();
     58             void setAbsolute(bool value) { m_absolute = value; setIsContextNodeSensitive(!m_absolute); }
     59 
     60             virtual Value evaluate() const;
     61             void evaluate(NodeSet& nodes) const; // nodes is an input/output parameter
     62 
     63             void appendStep(Step* step);
     64             void insertFirstStep(Step* step);
     65 
     66         private:
     67             virtual Value::Type resultType() const { return Value::NodeSetValue; }
     68 
     69             Vector<Step*> m_steps;
     70             bool m_absolute;
     71         };
     72 
     73         class Path : public Expression {
     74         public:
     75             Path(Filter*, LocationPath*);
     76             virtual ~Path();
     77 
     78             virtual Value evaluate() const;
     79 
     80         private:
     81             virtual Value::Type resultType() const { return Value::NodeSetValue; }
     82 
     83             Filter* m_filter;
     84             LocationPath* m_path;
     85         };
     86 
     87     }
     88 }
     89 
     90 #endif // XPath_Path_H
     91