src/document/css/css.c

   1 /* CSS module management */
   2
   3 #ifdef HAVE_CONFIG_H
   4 #include "config.h"
   5 #endif
   6
   7 #include <stdlib.h>
   8
   9 #include "elinks.h"
  10
  11 #include "cache/cache.h"
  12 #include "config/home.h"
  13 #include "config/options.h"
  14 #include "document/css/css.h"
  15 #include "document/css/parser.h"
  16 #include "document/css/stylesheet.h"
  17 #include "encoding/encoding.h"
  18 #include "intl/gettext/libintl.h"
  19 #include "main/module.h"
  20 #include "network/connection.h"
  21 #include "protocol/uri.h"
  22 #include "util/error.h"
  23 #include "util/memory.h"
  24 #include "viewer/text/draw.h"
  25
  26
  27 struct option_info css_options_info[] = {
  28         INIT_OPT_TREE("document", N_("Cascading Style Sheets"),
  29                 "css", OPT_SORT,
  30                 N_("Options concerning how to use CSS for styling documents.")),
  31
  32         INIT_OPT_BOOL("document.css", N_("Enable CSS"),
  33                 "enable", 0, 1,
  34                 N_("Enable adding of CSS style info to documents.")),
  35
  36         INIT_OPT_BOOL("document.css", N_("Import external style sheets"),
  37                 "import", 0, 1,
  38                 N_("When enabled any external style sheets that are imported from\n"
  39                 "either CSS itself using the @import keyword or from the HTML using\n"
  40                 "<link> tags in the document header will also be downloaded.")),
  41
  42         INIT_OPT_STRING("document.css", N_("Default style sheet"),
  43                 "stylesheet", 0, "",
  44                 N_("The path to the file containing the default user defined\n"
  45                 "Cascading Style Sheet. It can be used to control the basic\n"
  46                 "layout of HTML documents. The path is assumed to be relative\n"
  47                 "to ELinks' home directory.\n"
  48                 "Leave as \"\" to use built-in document styling.")),
  49
  50         NULL_OPTION_INFO,
  51 };
  52
  53
  54 void
  55 import_css(struct css_stylesheet *css, struct uri *uri)
  56 {
  57         /* Do we have it in the cache? (TODO: CSS cache) */
  58         struct cache_entry *cached;
  59         struct fragment *fragment;
  60
  61         if (!uri || css->import_level >= MAX_REDIRECTS)
  62                 return;
  63
  64         cached = get_redirected_cache_entry(uri);
  65         if (!cached) return;
  66
  67         fragment = get_cache_fragment(cached);
  68         if (fragment) {
  69                 unsigned char *end = fragment->data + fragment->length;
  70
  71                 css->import_level++;
  72                 css_parse_stylesheet(css, uri, fragment->data, end);
  73                 css->import_level--;
  74         }
  75 }
  76
  77
  78 static void
  79 import_css_file(struct css_stylesheet *css, struct uri *base_uri,
  80                 unsigned char *url, int urllen)
  81 {
  82         struct string string, filename;
  83
  84         if (!*url
  85             || css->import_level >= MAX_REDIRECTS
  86             || !init_string(&filename))
  87                 return;
  88
  89         if (*url != '/' && elinks_home) {
  90                 add_to_string(&filename, elinks_home);
  91         }
  92
  93         add_bytes_to_string(&filename, url, urllen);
  94
  95         if (read_encoded_file(&filename, &string) == S_OK) {
  96                 unsigned char *end = string.source + string.length;
  97
  98                 css->import_level++;
  99                 css_parse_stylesheet(css, base_uri, string.source, end);
 100                 done_string(&string);
 101                 css->import_level--;
 102         }
 103
 104         done_string(&filename);
 105 }
 106
 107 struct css_stylesheet default_stylesheet = INIT_CSS_STYLESHEET(default_stylesheet, import_css_file);
 108
 109 static void
 110 import_default_css(void)
 111 {
 112         unsigned char *url = get_opt_str("document.css.stylesheet");
 113
 114         if (!list_empty(default_stylesheet.selectors))
 115                 done_css_stylesheet(&default_stylesheet);
 116
 117         if (!*url) return;
 118
 119         import_css_file(&default_stylesheet, NULL, url, strlen(url));
 120 }
 121
 122 static int
 123 change_hook_css(struct session *ses, struct option *current, struct option *changed)
 124 {
 125         if (!strcmp(changed->name, "stylesheet")) {
 126                 /* TODO: We need to update all entries in format cache. --jonas */
 127                 import_default_css();
 128         }
 129
 130         draw_formatted(ses, 1);
 131
 132         return 0;
 133 }
 134
 135 static void
 136 init_css(struct module *module)
 137 {
 138         struct change_hook_info css_change_hooks[] = {
 139                 { "document.css",               change_hook_css },
 140                 { NULL,                         NULL },
 141         };
 142
 143         register_change_hooks(css_change_hooks);
 144         import_default_css();
 145 }
 146
 147 void
 148 done_css(struct module *module)
 149 {
 150         done_css_stylesheet(&default_stylesheet);
 151 }
 152
 153
 154 struct module css_module = struct_module(
 155         /* name: */             N_("Cascading Style Sheets"),
 156         /* options: */          css_options_info,
 157         /* hooks: */            NULL,
 158         /* submodules: */       NULL,
 159         /* data: */             NULL,
 160         /* init: */             init_css,
 161         /* done: */             done_css
 162 );