xml_example.cc

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 /*                                                                       */
 /*                 Author: Richard Caley (rjc@cstr.ed.ac.uk)             */
 /* --------------------------------------------------------------------  */
 /* Simple XML processing example.                                        */
 /*                                                                       */
 /*************************************************************************/
 
#include <cstdlib>
#include <fstream>
#include <iostream>
#include "rxp/XML_Parser.h"
 
#if defined(DATAC)
#    define __STRINGIZE(X) #X
#    define DATA __STRINGIZE(DATAC)
#endif
 
/**@name XML_Parser:example
  * 
  * Simple XML processing example.
  *
  * @see XML_Parser
  */
//@{
 
/** Any data needed during processing has to be passed around,
  * here we just keep track of the nesting depth.
  */
struct Parse_State
  {
  int depth;
  };
 
/** Define a subset of XML_Parser_Class which which has callbacks for
  * what we want to do. In a real application we might not need
  * to define them all.
  */
class My_Parser_Class : public XML_Parser_Class
{
protected:
  virtual void document_open(XML_Parser_Class &c,
            XML_Parser &p,
            void *data);
  virtual void document_close(XML_Parser_Class &c,
             XML_Parser &p,
             void *data);
  
  virtual void element_open(XML_Parser_Class &c,
               XML_Parser &p,
               void *data,
               const char *name,
               XML_Attribute_List &attributes);
  virtual void element(XML_Parser_Class &c,
          XML_Parser &p,
          void *data,
          const char *name,
          XML_Attribute_List &attributes);
  virtual void element_close(XML_Parser_Class &c,
            XML_Parser &p,
            void *data,
            const char *name);
 
  virtual void pcdata(XML_Parser_Class &c,
         XML_Parser &p,
         void *data,
         const char *chars);
  virtual void cdata(XML_Parser_Class &c,
        XML_Parser &p,
        void *data,
        const char *chars);
 
  virtual void processing(XML_Parser_Class &c,
             XML_Parser &p,
             void *data,
             const char *instruction);
  virtual void error(XML_Parser_Class &c,
        XML_Parser &p,
        void *data);
};
 
 
int main(void)
{
  My_Parser_Class pclass;
  Parse_State state;
 
  /** Rewriting rules for public and system IDs can be
    * used to locate local copies etc.
    */
 
  pclass.register_id("//EST//Test/\\(.*\\)",
             DATA "/\\1.dtd");
 
  /** An individual parser runs over a single source.
    */
  XML_Parser *parser = pclass.make_parser(DATA "/eg.xml",
                     &state);
  /** Run the parser.
    */
  parser->go();
  exit(0);
}
 
/** Now we define the callbacks.
  */
 
void My_Parser_Class::document_open(XML_Parser_Class &c,
              XML_Parser &p,
              void *data)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  state->depth=1;
 
  printf("%*s document %d\n", state->depth*4, ">", state->depth);
}
 
void My_Parser_Class::document_close(XML_Parser_Class &c,
            XML_Parser &p,
            void *data)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s <document %d\n", state->depth*4, ">", state->depth);
}
 
 
void My_Parser_Class::element_open(XML_Parser_Class &c,
          XML_Parser &p,
          void *data,
          const char *name,
          XML_Attribute_List &attributes)
{
  (void)c; (void)p; (void)attributes;
  Parse_State *state = (Parse_State *)data;
 
  state->depth++;
 
  printf("%*s %s %d\n", state->depth*4, ">", name, state->depth);
}
 
 
void My_Parser_Class::element(XML_Parser_Class &c,
         XML_Parser &p,
         void *data,
         const char *name,
         XML_Attribute_List &attributes)
{
  (void)c; (void)p; (void)attributes;
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s %s %d\n", state->depth*4, ":", name, state->depth);
}
 
 
void My_Parser_Class::element_close(XML_Parser_Class &c,
           XML_Parser &p,
           void *data,
           const char *name)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s %s %d\n", state->depth*4, "<", name, state->depth);
  state->depth--;
}
 
 
void My_Parser_Class::pcdata(XML_Parser_Class &c,
        XML_Parser &p,
        void *data,
        const char *chars)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s [pcdata[%s]] %d\n", state->depth*4, "", chars, state->depth);
}
 
 
void My_Parser_Class::cdata(XML_Parser_Class &c,
       XML_Parser &p,
       void *data,
       const char *chars)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s [cdata[%s]] %d\n", state->depth*4, "", chars, state->depth);
}
 
 
void My_Parser_Class::processing(XML_Parser_Class &c,
        XML_Parser &p,
        void *data,
        const char *instruction)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s [proc[%s]] %d\n", state->depth*4, "", instruction, state->depth);
}
 
 
void My_Parser_Class::error(XML_Parser_Class &c,
       XML_Parser &p,
       void *data)
{
  (void)c; (void)p; 
  Parse_State *state = (Parse_State *)data;
 
  printf("%*s [error[%s]] %d\n", state->depth*4, "", get_error(p), state->depth);
}
 
//@}