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      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 _xmlparser_h_
     29 #define _xmlparser_h_
     30 
     31 #include <string>
     32 
     33 #include "talk/xmllite/xmlnsstack.h"
     34 #ifdef EXPAT_RELATIVE_PATH
     35 #include "lib/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:
     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:
     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);
     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);
     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 }
    120 
    121 #endif
    122