1 /*
2  * libjingle
3  * Copyright 2004--2005, Google Inc.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  *  1. Redistributions of source code must retain the above copyright notice,
9  *     this list of conditions and the following disclaimer.
10  *  2. Redistributions in binary form must reproduce the above copyright notice,
11  *     this list of conditions and the following disclaimer in the documentation
12  *     and/or other materials provided with the distribution.
13  *  3. The name of the author may not be used to endorse or promote products
14  *     derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #ifndef TALK_XMLLITE_XMLPARSER_H_
29 #define TALK_XMLLITE_XMLPARSER_H_
30 
31 #include <string>
32 
33 #include "talk/xmllite/xmlnsstack.h"
34 #ifdef EXPAT_RELATIVE_PATH
35 #include "expat.h"
36 #else
37 #include "third_party/expat/v2_0_1/Source/lib/expat.h"
38 #endif  // EXPAT_RELATIVE_PATH
39 
40 struct XML_ParserStruct;
41 typedef struct XML_ParserStruct* XML_Parser;
42 
43 namespace buzz {
44 
45 class XmlParseHandler;
46 class XmlParseContext;
47 class XmlParser;
48 
49 class XmlParseContext {
50 public:
~XmlParseContext()51   virtual ~XmlParseContext() {}
52   virtual QName ResolveQName(const char * qname, bool isAttr) = 0;
53   virtual void RaiseError(XML_Error err) = 0;
54   virtual void GetPosition(unsigned long * line, unsigned long * column,
55                            unsigned long * byte_index) = 0;
56 };
57 
58 class XmlParseHandler {
59 public:
~XmlParseHandler()60   virtual ~XmlParseHandler() {}
61   virtual void StartElement(XmlParseContext * pctx,
62                const char * name, const char ** atts) = 0;
63   virtual void EndElement(XmlParseContext * pctx,
64                const char * name) = 0;
65   virtual void CharacterData(XmlParseContext * pctx,
66                const char * text, int len) = 0;
67   virtual void Error(XmlParseContext * pctx,
68                XML_Error errorCode) = 0;
69 };
70 
71 class XmlParser {
72 public:
73   static void ParseXml(XmlParseHandler * pxph, std::string text);
74 
75   explicit XmlParser(XmlParseHandler * pxph);
76   bool Parse(const char * data, size_t len, bool isFinal);
77   void Reset();
78   virtual ~XmlParser();
79 
80   // expat callbacks
81   void ExpatStartElement(const char * name, const char ** atts);
82   void ExpatEndElement(const char * name);
83   void ExpatCharacterData(const char * text, int len);
84   void ExpatXmlDecl(const char * ver, const char * enc, int standalone);
85 
86 private:
87 
88   class ParseContext : public XmlParseContext {
89   public:
90     ParseContext(XmlParser * parser);
91     virtual ~ParseContext();
92     virtual QName ResolveQName(const char * qname, bool isAttr);
RaiseError(XML_Error err)93     virtual void RaiseError(XML_Error err) { if (!raised_) raised_ = err; }
94     virtual void GetPosition(unsigned long * line, unsigned long * column,
95                              unsigned long * byte_index);
RaisedError()96     XML_Error RaisedError() { return raised_; }
97     void Reset();
98 
99     void StartElement();
100     void EndElement();
101     void StartNamespace(const char * prefix, const char * ns);
102     void SetPosition(int line, int column, long byte_index);
103 
104   private:
105     const XmlParser * parser_;
106     XmlnsStack xmlnsstack_;
107     XML_Error raised_;
108     XML_Size line_number_;
109     XML_Size column_number_;
110     XML_Index byte_index_;
111   };
112 
113   ParseContext context_;
114   XML_Parser expat_;
115   XmlParseHandler * pxph_;
116   bool sentError_;
117 };
118 
119 }  // namespace buzz
120 
121 #endif  // TALK_XMLLITE_XMLPARSER_H_
122