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/* Collect URLs from CSS source.
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Copyright (C) 1998, 2000, 2001, 2002, 2003, 2009 Free Software
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This file is part of GNU Wget.
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GNU Wget is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at
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your option) any later version.
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GNU Wget is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Wget. If not, see <http://www.gnu.org/licenses/>.
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Additional permission under GNU GPL version 3 section 7
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If you modify this program, or any covered work, by linking or
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combining it with the OpenSSL project's OpenSSL library (or a
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modified version of that library), containing parts covered by the
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terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
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grants you additional permission to convey the resulting work.
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Corresponding Source for a non-source form of such a combination
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shall include the source code for the parts of OpenSSL used as well
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as that of the covered work. */
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Note that this is not an actual CSS parser, but just a lexical
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scanner with a tiny bit more smarts bolted on top. A full parser
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is somewhat overkill for this job. The only things we're interested
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in are @import rules and url() tokens, so it's easy enough to
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grab those without truly understanding the input. The only downside
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to this is that we might be coerced into downloading files that
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a browser would ignore. That might merit some more investigation.
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#include "css-tokens.h"
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typedef struct yy_buffer_state *YY_BUFFER_STATE;
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extern YY_BUFFER_STATE yy_scan_bytes (const char *bytes,int len );
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extern int yylex (void);
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const char *token_names[] = {
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Given a detected URI token, get only the URI specified within.
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Also adjust the starting position and length of the string.
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A URI can be specified with or without quotes, and the quotes
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can be single or double quotes. In addition there can be
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whitespace after the opening parenthesis and before the closing
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get_uri_string (const char *at, int *pos, int *length)
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strncpy(buf,at + *pos, *length);
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DEBUGP (("get_uri_string: \"%s\"\n", buf));*/
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if (0 != strncasecmp (at + *pos, "url(", 4))
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*length -= 5; /* url() */
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/* skip leading space */
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while (isspace (at[*pos]))
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/* skip trailing space */
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while (isspace (at[*pos + *length - 1]))
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/* trim off quotes */
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if (at[*pos] == '\'' || at[*pos] == '"')
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uri = xmalloc (*length + 1);
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strncpy (uri, at + *pos, *length);
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get_urls_css (struct map_context *ctx, int offset, int buf_length)
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strncpy(tmp,ctx->text + offset, buf_length);
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tmp[buf_length] = '\0';
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DEBUGP (("get_urls_css: \"%s\"\n", tmp));
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/* tell flex to scan from this buffer */
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yy_scan_bytes (ctx->text + offset, buf_length);
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while((token = yylex()) != CSSEOF)
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/*DEBUGP (("%s ", token_names[token]));*/
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or @import url(foo.css)
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if(token == IMPORT_SYM)
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buffer_pos += yyleng;
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} while((token = yylex()) == S);
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/*DEBUGP (("%s ", token_names[token]));*/
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if (token == STRING || token == URI)
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/*DEBUGP (("Got URI "));*/
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pos = buffer_pos + offset;
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uri = get_uri_string (ctx->text, &pos, &length);
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/* cut out quote characters */
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uri = xmalloc (length + 1);
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strncpy (uri, yytext + 1, length);
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struct urlpos *up = append_url (uri, pos, length, ctx);
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DEBUGP (("Found @import: [%s] at %d [%s]\n", yytext, buffer_pos, uri));
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up->link_inline_p = 1;
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up->link_expect_css = 1;
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/* background-image: url(foo.png)
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note that we don't care what
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property this is actually on.
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else if(token == URI)
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pos = buffer_pos + offset;
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uri = get_uri_string (ctx->text, &pos, &length);
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struct urlpos *up = append_url (uri, pos, length, ctx);
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DEBUGP (("Found URI: [%s] at %d [%s]\n", yytext, buffer_pos, uri));
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up->link_inline_p = 1;
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buffer_pos += yyleng;
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get_urls_css_file (const char *file, const char *url)
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struct file_memory *fm;
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struct map_context ctx;
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fm = read_file (file);
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logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno));
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DEBUGP (("Loaded %s (size %s).\n", file, number_to_static_string (fm->length)));
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ctx.text = fm->content;
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ctx.head = ctx.tail = NULL;
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ctx.parent_base = url ? url : opt.base_href;
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ctx.document_file = file;
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get_urls_css (&ctx, 0, fm->length);