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xml_example.cc
/************************************************************************/
/* */
/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
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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);
}
//@}
XML_Parser_Class
Definition XML_Parser.h:78
XML_Parser_Class::XML_Parser
friend class XML_Parser
Definition XML_Parser.h:231
XML_Parser_Class::get_error
const char * get_error(XML_Parser &p)
Get the error message for the last error.
Definition XML_Parser.cc:225
XML_Parser_Class::make_parser
XML_Parser * make_parser(InputSource source, void *data)
Create a parser for the RXP InputSource.
Definition XML_Parser.cc:72
XML_Parser_Class::register_id
void register_id(EST_Regex id_pattern, EST_String directory)
Definition XML_Parser.cc:48
XML_Parser_Class::XML_Parser_Class
XML_Parser_Class()
Definition XML_Parser.cc:44
XML_Parser
Definition XML_Parser.h:240
XML_Parser::go
void go()
Run the parser.
Definition XML_Parser.cc:274