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/*
* Remove subtrees which have a certain class attribute.
*
* Copyright © 1994-2000 World Wide Web Consortium
* See http://www.w3.org/Consortium/Legal/copyright-software
*
* Bert Bos <bert@w3.org>
* Created Feb 2000
* $Id: hxprune.c,v 1.8 2017/11/24 09:50:25 bbos Exp $
*
**/
/* #include <mcheck.h> */
#include "config.h"
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <stdbool.h>
#if STDC_HEADERS
# include <string.h>
#else
# ifndef HAVE_STRCHR
# define strchr index
# define strrchr rindex
# endif
# ifndef HAVE_STRSTR
# include "strstr.e"
# endif
#endif
#include "export.h"
#include "types.e"
#include "tree.e"
#include "html.e"
#include "scan.e"
#include "dict.e"
#include "openurl.e"
#include "class.e"
#include "errexit.e"
#define EXCLUDE_CLASS "exclude" /* Default value for class */
static Tree tree;
static bool xml = false; /* Use <empty /> convention */
/* handle_error -- called when a parse error occurred */
static void handle_error(void *clientdata, const string s, int lineno)
{
fprintf(stderr, "%d: %s\n", lineno, s);
}
/* start -- called before the first event is reported */
static void* start(void)
{
tree = create();
return NULL;
}
/* end -- called after the last event is reported */
static void end(void *clientdata)
{
/* skip */
}
/* handle_comment -- called after a comment is parsed */
static void handle_comment(void *clientdata, string commenttext)
{
tree = append_comment(tree, commenttext);
}
/* handle_text -- called after a tex chunk is parsed */
static void handle_text(void *clientdata, string text)
{
tree = append_text(tree, text);
}
/* handle_declaration -- called after a declaration is parsed */
static void handle_decl(void *clientdata, string gi,
string fpi, string url)
{
tree = append_declaration(tree, gi, fpi, url);
}
/* handle_proc_instr -- called after a PI is parsed */
static void handle_pi(void *clientdata, string pi_text)
{
tree = append_procins(tree, pi_text);
}
/* handle_starttag -- called after a start tag is parsed */
static void handle_starttag(void *clientdata, string name, pairlist attribs)
{
tree = html_push(tree, name, attribs);
}
/* handle_emptytag -- called after an empty tag is parsed */
static void handle_emptytag(void *clientdata, string name, pairlist attribs)
{
tree = html_push(tree, name, attribs);
}
/* handle_pop -- called after an endtag is parsed (name may be "") */
static void handle_endtag(void *clientdata, string name)
{
tree = html_pop(tree, name);
}
/* prune -- write the tree, suppressing elements with a certain class */
static void prune(Tree t, const string class)
{
Tree h;
pairlist a;
for (h = t->children; h != NULL; h = h->sister) {
switch (h->tp) {
case Text:
printf("%s", h->text);
break;
case Comment:
printf("<!--%s-->", h->text);
break;
case Declaration:
printf("<!DOCTYPE %s", h->name);
if (h->text) printf(" PUBLIC \"%s\"", h->text);
if (h->url) printf(" %s\"%s\"", h->text ? "" : "SYSTEM ", h->url);
printf(">");
break;
case Procins:
printf("<?%s>", h->text);
break;
case Element:
if (! has_class(h->attribs, class)) {
printf("<%s", h->name);
for (a = h->attribs; a != NULL; a = a->next) {
printf(" %s", a->name);
if (a->value != NULL) printf("=\"%s\"", a->value);
else if (xml) printf("=\"%s\"", a->name);
}
if (is_empty(h->name)) {
assert(h->children == NULL);
printf(xml ? " />" : ">");
} else {
printf(">");
prune(h, class);
printf("</%s>", h->name);
}
}
break;
case Root:
assert(! "Cannot happen");
break;
default:
assert(! "Cannot happen");
}
}
}
/* usage -- print usage message and exit */
static void usage(string name)
{
fprintf(stderr, "Usage: %s [-c class] [-x] [html-file]\n", name);
exit(1);
}
int main(int argc, char *argv[])
{
int i, status;
string class = EXCLUDE_CLASS;
/* mtrace(); */
/* 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);
yyin = stdin;
for (i = 1; i < argc; i++) {
if (eq(argv[i], "-c")) {
if (i >= argc - 1) usage(argv[0]);
class = argv[++i];
} else if (eq(argv[i], "-x")) {
xml = true;
} else {
yyin = fopenurl(argv[i], "r", &status);
if (yyin == NULL) {perror(argv[1]); exit(2);}
if (status != 200) errexit("%s : %s\n", argv[i], http_strerror(status));
}
}
if (yyparse() != 0) {
exit(3);
}
tree = get_root(tree);
prune(tree, class);
tree_delete(tree); /* Just to test memory mgmt */
return 0;
}
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