2007-07-27 19:31:58 -04:00
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/** CSS module management
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* @file */
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2005-09-15 09:58:31 -04:00
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include "elinks.h"
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#include "cache/cache.h"
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#include "config/home.h"
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#include "config/options.h"
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#include "document/css/css.h"
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#include "document/css/parser.h"
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#include "document/css/stylesheet.h"
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#include "encoding/encoding.h"
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#include "intl/gettext/libintl.h"
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#include "main/module.h"
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#include "network/connection.h"
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#include "protocol/uri.h"
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2007-01-27 15:33:02 -05:00
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#include "session/session.h"
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2005-09-15 09:58:31 -04:00
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#include "util/error.h"
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#include "util/memory.h"
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#include "viewer/text/draw.h"
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struct option_info css_options_info[] = {
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INIT_OPT_TREE("document", N_("Cascading Style Sheets"),
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"css", OPT_SORT,
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N_("Options concerning how to use CSS for styling documents.")),
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INIT_OPT_BOOL("document.css", N_("Enable CSS"),
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"enable", 0, 1,
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N_("Enable adding of CSS style info to documents.")),
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2007-12-21 22:20:55 -05:00
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INIT_OPT_BOOL("document.css", N_("Ignore \"display: none\""),
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"ignore_display_none", 0, 1,
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N_("When enabled, elements are rendered, even when their display\n"
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"property has the value \"none\". Because ELinks's CSS support is\n"
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"still very incomplete, this setting can improve the way that some\n"
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"documents are rendered.")),
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2005-09-15 09:58:31 -04:00
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INIT_OPT_BOOL("document.css", N_("Import external style sheets"),
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"import", 0, 1,
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N_("When enabled any external style sheets that are imported from\n"
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"either CSS itself using the @import keyword or from the HTML using\n"
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"<link> tags in the document header will also be downloaded.")),
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INIT_OPT_STRING("document.css", N_("Default style sheet"),
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"stylesheet", 0, "",
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N_("The path to the file containing the default user defined\n"
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"Cascading Style Sheet. It can be used to control the basic\n"
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"layout of HTML documents. The path is assumed to be relative\n"
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"to ELinks' home directory.\n"
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"Leave as \"\" to use built-in document styling.")),
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2007-12-21 22:18:06 -05:00
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INIT_OPT_STRING("document.css", N_("Media types"),
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"media", 0, "tty",
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N_("CSS media types that ELinks claims to support, separated with\n"
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"commas. The \"all\" type is implied. Currently, only ASCII\n"
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"characters work reliably here. See CSS2 section 7:\n"
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"http://www.w3.org/TR/1998/REC-CSS2-19980512/media.html")),
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2005-09-15 09:58:31 -04:00
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NULL_OPTION_INFO,
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};
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2007-12-21 22:18:06 -05:00
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/** Check whether ELinks claims to support a specific CSS media type.
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*
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* @param optstr
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* Null-terminated value of the document.css.media option.
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* @param token
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* A name parsed from a CSS file or from an HTML media attribute.
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* Need not be null-terminated.
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2007-12-21 22:18:06 -05:00
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* @param token_length
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* Length of @a token, in bytes.
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*
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* Both strings should be in the ASCII charset.
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*
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* @return nonzero if the media type is supported, 0 if not. */
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int
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supports_css_media_type(const unsigned char *optstr,
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const unsigned char *token, size_t token_length)
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{
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/* Split @optstr into comma-delimited strings, strip leading
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* and trailing spaces from each, and compare them to the
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* token. */
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while (*optstr != '\0') {
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const unsigned char *beg, *end;
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while (*optstr == ' ')
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++optstr;
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beg = optstr;
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optstr += strcspn(optstr, ",");
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end = optstr;
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while (end > beg && end[-1] == ' ')
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--end;
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2008-01-12 03:08:57 -05:00
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/* W3C REC-html401-19991224 section 6.13:
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* "3. A case-sensitive match is then made with
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* the set of media types defined above."
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* W3C REC-html401-19991224 section 14.2.3:
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* "media = media-descriptors [CI]"
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* where CI stands for case-insensitive.
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* This mismatch has been reported to the
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* www-html-editor@w3.org mailing list on 2000-11-16.
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*
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* W3C REC-CSS2-19980512 section 7.3:
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* "Media type names are case-insensitive." */
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2007-12-21 22:18:06 -05:00
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if (!strlcasecmp(token, token_length, beg, end - beg))
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return 1;
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while (*optstr == ',')
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++optstr;
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}
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/* An explicit "all" is probably rarer than e.g. "tty". */
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if (!strlcasecmp(token, token_length, "all", 3))
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return 1;
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return 0;
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}
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2005-09-15 09:58:31 -04:00
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void
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import_css(struct css_stylesheet *css, struct uri *uri)
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{
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/* Do we have it in the cache? (TODO: CSS cache) */
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struct cache_entry *cached;
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struct fragment *fragment;
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if (!uri || css->import_level >= MAX_REDIRECTS)
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return;
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cached = get_redirected_cache_entry(uri);
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if (!cached) return;
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fragment = get_cache_fragment(cached);
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if (fragment) {
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unsigned char *end = fragment->data + fragment->length;
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css->import_level++;
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css_parse_stylesheet(css, uri, fragment->data, end);
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css->import_level--;
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}
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}
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static void
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import_css_file(struct css_stylesheet *css, struct uri *base_uri,
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unsigned char *url, int urllen)
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{
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struct string string, filename;
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if (!*url
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|| css->import_level >= MAX_REDIRECTS
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|| !init_string(&filename))
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return;
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if (*url != '/' && elinks_home) {
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add_to_string(&filename, elinks_home);
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}
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add_bytes_to_string(&filename, url, urllen);
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if (read_encoded_file(&filename, &string) == S_OK) {
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unsigned char *end = string.source + string.length;
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css->import_level++;
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css_parse_stylesheet(css, base_uri, string.source, end);
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done_string(&string);
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css->import_level--;
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}
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done_string(&filename);
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}
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struct css_stylesheet default_stylesheet = INIT_CSS_STYLESHEET(default_stylesheet, import_css_file);
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static void
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import_default_css(void)
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{
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2007-08-28 12:41:18 -04:00
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unsigned char *url = get_opt_str("document.css.stylesheet", NULL);
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2005-09-15 09:58:31 -04:00
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2007-07-15 13:04:39 -04:00
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if (!css_selector_set_empty(&default_stylesheet.selectors))
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2005-09-15 09:58:31 -04:00
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done_css_stylesheet(&default_stylesheet);
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if (!*url) return;
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import_css_file(&default_stylesheet, NULL, url, strlen(url));
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}
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static int
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change_hook_css(struct session *ses, struct option *current, struct option *changed)
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{
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2007-12-21 22:57:58 -05:00
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int reload_css = 0;
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if (!strcmp(changed->name, "stylesheet")) {
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2007-07-27 19:31:58 -04:00
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/** @todo TODO: We need to update all entries in
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* format cache. --jonas */
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2005-09-15 09:58:31 -04:00
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import_default_css();
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}
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2007-12-21 22:57:58 -05:00
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if (!strcmp(changed->name, "media"))
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reload_css = 1;
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2007-01-27 15:33:02 -05:00
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/* Instead of using the value of the @ses parameter, iterate
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* through the @sessions list. The parameter may be NULL and
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* anyway we don't support session-specific options yet. */
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2007-12-21 22:57:58 -05:00
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foreach (ses, sessions) draw_formatted(ses, 1 + reload_css);
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2005-09-15 09:58:31 -04:00
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return 0;
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}
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static void
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init_css(struct module *module)
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{
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2007-01-27 12:00:47 -05:00
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static const struct change_hook_info css_change_hooks[] = {
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2005-09-15 09:58:31 -04:00
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{ "document.css", change_hook_css },
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{ NULL, NULL },
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};
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register_change_hooks(css_change_hooks);
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import_default_css();
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}
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void
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done_css(struct module *module)
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{
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done_css_stylesheet(&default_stylesheet);
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}
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struct module css_module = struct_module(
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/* name: */ N_("Cascading Style Sheets"),
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/* options: */ css_options_info,
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/* hooks: */ NULL,
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/* submodules: */ NULL,
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/* data: */ NULL,
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/* init: */ init_css,
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/* done: */ done_css
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);
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