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 XPathPredicate_h
28#define XPathPredicate_h
29
30#include "core/xml/XPathExpressionNode.h"
31#include "core/xml/XPathValue.h"
32
33namespace WebCore {
34
35    namespace XPath {
36
37        class Number : public Expression {
38        public:
39            explicit Number(double);
40        private:
41            virtual Value evaluate() const;
42            virtual Value::Type resultType() const { return Value::NumberValue; }
43
44            Value m_value;
45        };
46
47        class StringExpression : public Expression {
48        public:
49            explicit StringExpression(const String&);
50        private:
51            virtual Value evaluate() const;
52            virtual Value::Type resultType() const { return Value::StringValue; }
53
54            Value m_value;
55        };
56
57        class Negative : public Expression {
58        private:
59            virtual Value evaluate() const;
60            virtual Value::Type resultType() const { return Value::NumberValue; }
61        };
62
63        class NumericOp : public Expression {
64        public:
65            enum Opcode {
66                OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod
67            };
68            NumericOp(Opcode, Expression* lhs, Expression* rhs);
69        private:
70            virtual Value evaluate() const;
71            virtual Value::Type resultType() const { return Value::NumberValue; }
72
73            Opcode m_opcode;
74        };
75
76        class EqTestOp : public Expression {
77        public:
78            enum Opcode { OP_EQ, OP_NE, OP_GT, OP_LT, OP_GE, OP_LE };
79            EqTestOp(Opcode, Expression* lhs, Expression* rhs);
80            virtual Value evaluate() const;
81        private:
82            virtual Value::Type resultType() const { return Value::BooleanValue; }
83            bool compare(const Value&, const Value&) const;
84
85            Opcode m_opcode;
86        };
87
88        class LogicalOp : public Expression {
89        public:
90            enum Opcode { OP_And, OP_Or };
91            LogicalOp(Opcode, Expression* lhs, Expression* rhs);
92        private:
93            virtual Value::Type resultType() const { return Value::BooleanValue; }
94            bool shortCircuitOn() const;
95            virtual Value evaluate() const;
96
97            Opcode m_opcode;
98        };
99
100        class Union : public Expression {
101        private:
102            virtual Value evaluate() const;
103            virtual Value::Type resultType() const { return Value::NodeSetValue; }
104        };
105
106        class Predicate {
107            WTF_MAKE_NONCOPYABLE(Predicate); WTF_MAKE_FAST_ALLOCATED;
108        public:
109            explicit Predicate(Expression*);
110            ~Predicate();
111            bool evaluate() const;
112
113            bool isContextPositionSensitive() const { return m_expr->isContextPositionSensitive() || m_expr->resultType() == Value::NumberValue; }
114            bool isContextSizeSensitive() const { return m_expr->isContextSizeSensitive(); }
115
116        private:
117            Expression* m_expr;
118        };
119
120    }
121
122}
123
124#endif // XPathPredicate_h
125