1/*
2 * Copyright 2005 Maksim Orlovich <maksim@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 XPathParser_h
28#define XPathParser_h
29
30#if ENABLE(XPATH)
31
32#include "XPathStep.h"
33#include "XPathPredicate.h"
34
35namespace WebCore {
36
37    typedef int ExceptionCode;
38
39    class XPathNSResolver;
40
41    namespace XPath {
42
43        class Expression;
44        class ParseNode;
45        class Predicate;
46
47        struct Token {
48            int type;
49            String str;
50            Step::Axis axis;
51            NumericOp::Opcode numop;
52            EqTestOp::Opcode eqop;
53
54            Token(int t) : type(t) {}
55            Token(int t, const String& v): type(t), str(v) {}
56            Token(int t, Step::Axis v): type(t), axis(v) {}
57            Token(int t, NumericOp::Opcode v): type(t), numop(v) {}
58            Token(int t, EqTestOp::Opcode v): type(t), eqop(v) {}
59        };
60
61        class Parser {
62            WTF_MAKE_NONCOPYABLE(Parser);
63        public:
64            Parser();
65            ~Parser();
66
67            XPathNSResolver* resolver() const { return m_resolver.get(); }
68            bool expandQName(const String& qName, String& localName, String& namespaceURI);
69
70            Expression* parseStatement(const String& statement, PassRefPtr<XPathNSResolver>, ExceptionCode&);
71
72            static Parser* current() { return currentParser; }
73
74            int lex(void* yylval);
75
76            Expression* m_topExpr;
77            bool m_gotNamespaceError;
78
79            void registerParseNode(ParseNode*);
80            void unregisterParseNode(ParseNode*);
81
82            void registerPredicateVector(Vector<Predicate*>*);
83            void deletePredicateVector(Vector<Predicate*>*);
84
85            void registerExpressionVector(Vector<Expression*>*);
86            void deleteExpressionVector(Vector<Expression*>*);
87
88            void registerString(String*);
89            void deleteString(String*);
90
91            void registerNodeTest(Step::NodeTest*);
92            void deleteNodeTest(Step::NodeTest*);
93
94        private:
95            bool isBinaryOperatorContext() const;
96
97            void skipWS();
98            Token makeTokenAndAdvance(int type, int advance = 1);
99            Token makeTokenAndAdvance(int type, NumericOp::Opcode, int advance = 1);
100            Token makeTokenAndAdvance(int type, EqTestOp::Opcode, int advance = 1);
101            char peekAheadHelper();
102            char peekCurHelper();
103
104            Token lexString();
105            Token lexNumber();
106            bool lexNCName(String&);
107            bool lexQName(String&);
108
109            Token nextToken();
110            Token nextTokenInternal();
111
112            void reset(const String& data);
113
114            static Parser* currentParser;
115
116            unsigned m_nextPos;
117            String m_data;
118            int m_lastTokenType;
119            RefPtr<XPathNSResolver> m_resolver;
120
121            HashSet<ParseNode*> m_parseNodes;
122            HashSet<Vector<Predicate*>*> m_predicateVectors;
123            HashSet<Vector<Expression*>*> m_expressionVectors;
124            HashSet<String*> m_strings;
125            HashSet<Step::NodeTest*> m_nodeTests;
126        };
127
128    }
129}
130
131#endif // ENABLE(XPATH)
132
133#endif
134