xml_parser_main.cc

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 /*                 Author: Richard Caley (rjc@cstr.ed.ac.uk)             */
 /* --------------------------------------------------------------------  */
 /* Simple XML parsing mainline.                                          */
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#include <cstdlib>
#include <fstream>
#include <iostream>
#include "EST_error.h"
#include "EST_cutils.h"
#include "EST_cmd_line.h"
#include "EST_cmd_line_options.h"
#include "rxp/XML_Parser.h"

using namespace std;

struct Parse_State
  {
  int depth;
  };

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(int argc, char *argv[])
{
  My_Parser_Class pclass;
  EST_Option al;
  EST_StrList files;
  EST_String filename;
  Parse_State state;

  parse_command_line
      (argc, argv, 
    EST_String("[file] [options]\n")+
       "Summary: parse xml and output a tree.\n" 
       "use \"-\" to make input file stdin\n" 
       "-sysdir <string> Look for unqualified system entities in this directory"
       "-h               Options help\n",
            files, al);

  switch (files.length())
    {
    case 0: filename="-";
      break;
    case 1: filename=files.first();
      break;
    default:
      EST_error("Expected only one filename");
      break;
    }

  if (al.present("-sysdir"))
    pclass.register_id("^\\([^/]*\\)",
               al.sval("-sysdir") + "/\\1");

  pclass.register_id("//CSTR//EST \\(.*\\)",
             EST_String::cat(est_libdir, "/\\1.dtd"));

  /* An individual parser runs over a single source.
    */
  XML_Parser *parser = pclass.make_parser(filename,
                      &state);
  /* Run the parser.
    */
  parser->go();
  exit(0);
}

static void print_attributes(XML_Attribute_List &attributes)
{
  XML_Attribute_List::Entries them;

  for(them.begin(attributes); them ; them++)
    printf(" %s='%s'", 
       (const char *)them->k, 
       (const char *)them->v);
}

/* Now we define the callbacks.
  */

void My_Parser_Class::document_open(XML_Parser_Class &c,
              XML_Parser &p,
              void *data)
{
  (void)c; (void)p; 
  (void)print_attributes;
  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", state->depth*4, ">", name, state->depth);
  print_attributes(attributes);
  printf("\n");
}


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", state->depth*4, ":", name, state->depth);
  print_attributes(attributes);
  printf("\n");
}


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);
}