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 blink {
34
35namespace XPath {
36
37class Number FINAL : public Expression {
38public:
39    explicit Number(double);
40    virtual void trace(Visitor*) OVERRIDE;
41
42private:
43    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
44    virtual Value::Type resultType() const OVERRIDE { return Value::NumberValue; }
45
46    Value m_value;
47};
48
49class StringExpression FINAL : public Expression {
50public:
51    explicit StringExpression(const String&);
52    virtual void trace(Visitor*) OVERRIDE;
53
54private:
55    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
56    virtual Value::Type resultType() const OVERRIDE { return Value::StringValue; }
57
58    Value m_value;
59};
60
61class Negative FINAL : public Expression {
62private:
63    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
64    virtual Value::Type resultType() const OVERRIDE { return Value::NumberValue; }
65};
66
67class NumericOp FINAL : public Expression {
68public:
69    enum Opcode {
70        OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod
71    };
72    NumericOp(Opcode, PassOwnPtrWillBeRawPtr<Expression> lhs, PassOwnPtrWillBeRawPtr<Expression> rhs);
73
74private:
75    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
76    virtual Value::Type resultType() const OVERRIDE { return Value::NumberValue; }
77
78    Opcode m_opcode;
79};
80
81class EqTestOp FINAL : public Expression {
82public:
83    enum Opcode { OpcodeEqual, OpcodeNotEqual, OpcodeGreaterThan, OpcodeLessThan, OpcodeGreaterOrEqual, OpcodeLessOrEqual };
84    EqTestOp(Opcode, PassOwnPtrWillBeRawPtr<Expression> lhs, PassOwnPtrWillBeRawPtr<Expression> rhs);
85    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
86
87private:
88    virtual Value::Type resultType() const OVERRIDE { return Value::BooleanValue; }
89    bool compare(EvaluationContext&, const Value&, const Value&) const;
90
91    Opcode m_opcode;
92};
93
94class LogicalOp FINAL : public Expression {
95public:
96    enum Opcode { OP_And, OP_Or };
97    LogicalOp(Opcode, PassOwnPtrWillBeRawPtr<Expression> lhs, PassOwnPtrWillBeRawPtr<Expression> rhs);
98
99private:
100    virtual Value::Type resultType() const OVERRIDE { return Value::BooleanValue; }
101    bool shortCircuitOn() const;
102    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
103
104    Opcode m_opcode;
105};
106
107class Union FINAL : public Expression {
108private:
109    virtual Value evaluate(EvaluationContext&) const OVERRIDE;
110    virtual Value::Type resultType() const OVERRIDE { return Value::NodeSetValue; }
111};
112
113class Predicate FINAL : public NoBaseWillBeGarbageCollected<Predicate> {
114    WTF_MAKE_NONCOPYABLE(Predicate); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
115    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(Predicate);
116public:
117    explicit Predicate(PassOwnPtrWillBeRawPtr<Expression>);
118    void trace(Visitor*);
119
120    bool evaluate(EvaluationContext&) const;
121    bool isContextPositionSensitive() const { return m_expr->isContextPositionSensitive() || m_expr->resultType() == Value::NumberValue; }
122    bool isContextSizeSensitive() const { return m_expr->isContextSizeSensitive(); }
123
124private:
125    OwnPtrWillBeMember<Expression> m_expr;
126};
127
128}
129
130}
131#endif // XPathPredicate_h
132