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/*
* Count elements and attributes.
*
* This counts occurrences of elements and element/attribute pairs.
* This is just an example of how to use the parser.
* No attempt is made to count efficiently.
*
* Copyright © 1994-2000 World Wide Web Consortium
* See http://www.w3.org/Consortium/Legal/copyright-software
*
* Bert Bos
* Created Nov 1998
* $Id: hxcount.c,v 1.5 2017/11/24 09:50:25 bbos Exp $
*/
#include "config.h"
#include <stdio.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <ctype.h>
#if STDC_HEADERS
# include <string.h>
#else
# ifndef HAVE_STRCHR
# define strchr index
# define strrchr rindex
# endif
# ifndef HAVE_STRdup
# include "strdup.e"
# endif
#endif
#include <stdlib.h>
#include <assert.h>
#include <stdbool.h>
#include "export.h"
#include "types.e"
#include "html.e"
#include "scan.e"
#include "dict.e"
#include "openurl.e"
#include "errexit.e"
typedef struct _pair {
char *name;
int count;
} pair;
static pair *freq = NULL;
static int nrelems = 0;
static bool has_errors = false;
/* countstring -- add 1 to number of occurences for s (case-insensitively) */
static void countstring(char *s)
{
int i;
i = 0;
while (i < nrelems && strcasecmp(freq[i].name, s) != 0) i++;
if (i == nrelems) {
nrelems++;
freq = realloc(freq, nrelems * sizeof(freq[0]));
if (freq == NULL) {fprintf(stderr, "Out of memory\n"); exit(4);}
freq[i].name = strdup(s);
freq[i].count = 0;
}
freq[i].count++;
}
/* count -- count element types and their attributes */
static void count(char *name, pairlist attribs)
{
/* Count element name */
countstring(name);
/* Count attribute names (or rather, the strings "elem/attrib") */
for (; attribs != NULL; attribs = attribs->next) {
char *s = malloc(strlen(name) + strlen(attribs->name) + 2);
if (s == NULL) {fprintf(stderr, "Out of memory\n"); exit(4);}
strcat(strcat(strcpy(s, name), "/"), attribs->name);
countstring(s);
free(s);
}
}
/* handle_error -- called when a parse error occurred */
void handle_error(void *clientdata, const string s, int lineno)
{
fprintf(stderr, "%d: %s\n", lineno, s);
has_errors = true;
}
/* start -- called before the first event is reported */
void* start(void) {return NULL;}
/* end -- called after the last event is reported */
void end(void *clientdata) {}
/* handle_comment -- called after a comment is parsed */
void handle_comment(void *clientdata, string commenttext) {}
/* handle_text -- called after a tex chunk is parsed */
void handle_text(void *clientdata, string text) {}
/* handle_declaration -- called after a declaration is parsed */
void handle_decl(void *clientdata, string gi,
string fpi, string url) {}
/* handle_proc_instr -- called after a PI is parsed */
void handle_pi(void *clientdata, string pi_text) {}
/* handle_starttag -- called after a start tag is parsed */
void handle_starttag(void *clientdata, string name, pairlist attribs)
{
count(name, attribs);
}
/* handle_emptytag -- called after am empty tag is parsed */
extern void handle_emptytag(void *clientdata, string name, pairlist attribs)
{
count(name, attribs);
}
/* handle_pop -- called after an endtag is parsed (name may be "") */
extern void handle_endtag(void *clientdata, string name) {}
/* usage -- print usage message and exit */
static void usage(string prog)
{
fprintf(stderr, "Version %s\n", VERSION);
fprintf(stderr, "Usage: %s [html-file]\n", prog);
exit(2);
}
/* main -- parse input, count elements and attributes of each type */
int main(int argc, char *argv[])
{
int i, status = 200;
/* Bind the parser callback routines to our handlers */
set_error_handler(handle_error);
set_start_handler(start);
set_end_handler(end);
set_comment_handler(handle_comment);
set_text_handler(handle_text);
set_decl_handler(handle_decl);
set_pi_handler(handle_pi);
set_starttag_handler(handle_starttag);
set_emptytag_handler(handle_emptytag);
set_endtag_handler(handle_endtag);
if (argc == 1) yyin = stdin;
else if (argc == 2) yyin = fopenurl(argv[1], "r", &status);
else usage(argv[0]);
if (yyin == NULL) {perror(argv[1]); exit(1);}
if (status != 200) errexit("%s : %s\n", argv[1], http_strerror(status));
/* Parse input */
if (yyparse() != 0) exit(3);
/* Print results */
for (i = 0; i < nrelems; i++)
printf("%6d\t%s\n", freq[i].count, freq[i].name);
return has_errors ? 1 : 0;
}
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