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#include <stdlib.h>
#include "chunk.h"
#include "scanners.h"
bufsize_t _scan_at(bufsize_t (*scanner)(const unsigned char *), cmark_chunk *c, bufsize_t offset)
{
bufsize_t res;
unsigned char *ptr = (unsigned char *)c->data;
unsigned char zero = '\0';
if (ptr == NULL) {
res = scanner(&zero);
} else {
unsigned char lim = ptr[c->len];
ptr[c->len] = '\0';
res = scanner(ptr + offset);
ptr[c->len] = lim;
}
return res;
}
/*!re2c
re2c:define:YYCTYPE = "unsigned char";
re2c:define:YYCURSOR = p;
re2c:define:YYMARKER = marker;
re2c:define:YYCTXMARKER = marker;
re2c:yyfill:enable = 0;
wordchar = [^\x00-\x20];
spacechar = [ \t\v\f\r\n];
reg_char = [^\\()\x00-\x20];
escaped_char = [\\][!"#$%&'()*+,./:;<=>?@[\\\]^_`{|}~-];
tagname = [A-Za-z][A-Za-z0-9-]*;
blocktagname = 'address'|'article'|'aside'|'base'|'basefont'|'blockquote'|'body'|'caption'|'center'|'col'|'colgroup'|'dd'|'details'|'dialog'|'dir'|'div'|'dl'|'dt'|'fieldset'|'figcaption'|'figure'|'footer'|'form'|'frame'|'frameset'|'h1'|'head'|'header'|'hr'|'html'|'iframe'|'legend'|'li'|'link'|'main'|'menu'|'menuitem'|'meta'|'nav'|'noframes'|'ol'|'optgroup'|'option'|'p'|'param'|'section'|'source'|'title'|'summary'|'table'|'tbody'|'td'|'tfoot'|'th'|'thead'|'title'|'tr'|'track'|'ul';
attributename = [a-zA-Z_:][a-zA-Z0-9:._-]*;
unquotedvalue = [^\"'=<>`\x00]+;
singlequotedvalue = ['][^'\x00]*['];
doublequotedvalue = [\"][^\"\x00]*[\"];
attributevalue = unquotedvalue | singlequotedvalue | doublequotedvalue;
attributevaluespec = spacechar* [=] spacechar* attributevalue;
attribute = spacechar+ attributename attributevaluespec?;
opentag = tagname attribute* spacechar* [/]? [>];
closetag = [/] tagname spacechar* [>];
htmlcomment = "!---->" | ("!--" ([-]? [^\x00>-]) ([-]? [^\x00-])* "-->");
processinginstruction = "?" ([^?>\x00]+ | [?][^>\x00] | [>])* "?>";
declaration = "!" [A-Z]+ spacechar+ [^>\x00]* ">";
cdata = "![CDATA[" ([^\]\x00]+ | "]" [^\]\x00] | "]]" [^>\x00])* "]]>";
htmltag = opentag | closetag | htmlcomment | processinginstruction |
declaration | cdata;
in_parens_nosp = [(] (reg_char|escaped_char|[\\])* [)];
in_double_quotes = ["] (escaped_char|[^"\x00])* ["];
in_single_quotes = ['] (escaped_char|[^'\x00])* ['];
in_parens = [(] (escaped_char|[^)\x00])* [)];
scheme = 'coap'|'doi'|'javascript'|'aaa'|'aaas'|'about'|'acap'|'cap'|'cid'|'crid'|'data'|'dav'|'dict'|'dns'|'file'|'ftp'|'geo'|'go'|'gopher'|'h323'|'http'|'https'|'iax'|'icap'|'im'|'imap'|'info'|'ipp'|'iris'|'iris.beep'|'iris.xpc'|'iris.xpcs'|'iris.lwz'|'ldap'|'mailto'|'mid'|'msrp'|'msrps'|'mtqp'|'mupdate'|'news'|'nfs'|'ni'|'nih'|'nntp'|'opaquelocktoken'|'pop'|'pres'|'rtsp'|'service'|'session'|'shttp'|'sieve'|'sip'|'sips'|'sms'|'snmp'|'soap.beep'|'soap.beeps'|'tag'|'tel'|'telnet'|'tftp'|'thismessage'|'tn3270'|'tip'|'tv'|'urn'|'vemmi'|'ws'|'wss'|'xcon'|'xcon-userid'|'xmlrpc.beep'|'xmlrpc.beeps'|'xmpp'|'z39.50r'|'z39.50s'|'adiumxtra'|'afp'|'afs'|'aim'|'apt'|'attachment'|'aw'|'beshare'|'bitcoin'|'bolo'|'callto'|'chrome'|'chrome-extension'|'com-eventbrite-attendee'|'content'|'cvs'|'dlna-playsingle'|'dlna-playcontainer'|'dtn'|'dvb'|'ed2k'|'facetime'|'feed'|'finger'|'fish'|'gg'|'git'|'gizmoproject'|'gtalk'|'hcp'|'icon'|'ipn'|'irc'|'irc6'|'ircs'|'itms'|'jar'|'jms'|'keyparc'|'lastfm'|'ldaps'|'magnet'|'maps'|'market'|'message'|'mms'|'ms-help'|'msnim'|'mumble'|'mvn'|'notes'|'oid'|'palm'|'paparazzi'|'platform'|'proxy'|'psyc'|'query'|'res'|'resource'|'rmi'|'rsync'|'rtmp'|'secondlife'|'sftp'|'sgn'|'skype'|'smb'|'soldat'|'spotify'|'ssh'|'steam'|'svn'|'teamspeak'|'things'|'udp'|'unreal'|'ut2004'|'ventrilo'|'view-source'|'webcal'|'wtai'|'wyciwyg'|'xfire'|'xri'|'ymsgr';
*/
// Try to match a scheme including colon.
bufsize_t _scan_scheme(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
scheme [:] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match URI autolink after first <, returning number of chars matched.
bufsize_t _scan_autolink_uri(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
scheme [:][^\x00-\x20<>]*[>] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match email autolink after first <, returning num of chars matched.
bufsize_t _scan_autolink_email(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+
[@]
[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?
([.][a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*
[>] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match an HTML tag after first <, returning num of chars matched.
bufsize_t _scan_html_tag(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
htmltag { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match an HTML block tag start line, returning
// an integer code for the type of block (1-6, matching the spec).
// #7 is handled by a separate function, below.
bufsize_t _scan_html_block_start(const unsigned char *p)
{
const unsigned char *marker = NULL;
/*!re2c
[<] ('script'|'pre'|'style') (spacechar | [>]) { return 1; }
'<!--' { return 2; }
'<?' { return 3; }
'<!' [A-Z] { return 4; }
'<![CDATA[' { return 5; }
[<] [/]? blocktagname (spacechar | [/]? [>]) { return 6; }
.? { return 0; }
*/
}
// Try to match an HTML block tag start line of type 7, returning
// 7 if successful, 0 if not.
bufsize_t _scan_html_block_start_7(const unsigned char *p)
{
const unsigned char *marker = NULL;
/*!re2c
[<] (opentag | closetag) [\t\n\f ]* [\r\n] { return 7; }
.? { return 0; }
*/
}
// Try to match an HTML block end line of type 1
bufsize_t _scan_html_block_end_1(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
.* [<] [/] ('script'|'pre'|'style') [>] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match an HTML block end line of type 2
bufsize_t _scan_html_block_end_2(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
.* '-->' { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match an HTML block end line of type 3
bufsize_t _scan_html_block_end_3(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
.* '?>' { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match an HTML block end line of type 4
bufsize_t _scan_html_block_end_4(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
.* '>' { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match an HTML block end line of type 5
bufsize_t _scan_html_block_end_5(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
.* ']]>' { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match a URL in a link or reference, return number of chars matched.
// This may optionally be contained in <..>; otherwise
// whitespace and unbalanced right parentheses aren't allowed.
// Newlines aren't ever allowed.
bufsize_t _scan_link_url(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
[ \r\n]* [<] ([^<>\r\n\\\x00] | escaped_char | [\\])* [>] { return (bufsize_t)(p - start); }
[ \r\n]* (reg_char+ | escaped_char | in_parens_nosp | [\\][^()])* { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Try to match a link title (in single quotes, in double quotes, or
// in parentheses), returning number of chars matched. Allow one
// level of internal nesting (quotes within quotes).
bufsize_t _scan_link_title(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
["] (escaped_char|[^"\x00])* ["] { return (bufsize_t)(p - start); }
['] (escaped_char|[^'\x00])* ['] { return (bufsize_t)(p - start); }
[(] (escaped_char|[^)\x00])* [)] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Match space characters, including newlines.
bufsize_t _scan_spacechars(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p; \
/*!re2c
[ \t\v\f\r\n]* { return (bufsize_t)(p - start); }
. { return 0; }
*/
}
// Match ATX heading start.
bufsize_t _scan_atx_heading_start(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
[#]{1,6} ([ ]+|[\r\n]) { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Match setext heading line. Return 1 for level-1 heading,
// 2 for level-2, 0 for no match.
bufsize_t _scan_setext_heading_line(const unsigned char *p)
{
const unsigned char *marker = NULL;
/*!re2c
[=]+ [ ]* [\r\n] { return 1; }
[-]+ [ ]* [\r\n] { return 2; }
.? { return 0; }
*/
}
// Scan a horizontal rule line: "...three or more hyphens, asterisks,
// or underscores on a line by themselves. If you wish, you may use
// spaces between the hyphens or asterisks."
bufsize_t _scan_hrule(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
([*][ ]*){3,} [ \t]* [\r\n] { return (bufsize_t)(p - start); }
([_][ ]*){3,} [ \t]* [\r\n] { return (bufsize_t)(p - start); }
([-][ ]*){3,} [ \t]* [\r\n] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Scan an opening code fence.
bufsize_t _scan_open_code_fence(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
[`]{3,} / [^`\r\n\x00]*[\r\n] { return (bufsize_t)(p - start); }
[~]{3,} / [^~\r\n\x00]*[\r\n] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Scan a closing code fence with length at least len.
bufsize_t _scan_close_code_fence(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
[`]{3,} / [ \t]*[\r\n] { return (bufsize_t)(p - start); }
[~]{3,} / [ \t]*[\r\n] { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Scans an entity.
// Returns number of chars matched.
bufsize_t _scan_entity(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
[&] ([#] ([Xx][A-Fa-f0-9]{1,8}|[0-9]{1,8}) |[A-Za-z][A-Za-z0-9]{1,31} ) [;]
{ return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
// Returns positive value if a URL begins in a way that is potentially
// dangerous, with javascript:, vbscript:, file:, or data:, otherwise 0.
bufsize_t _scan_dangerous_url(const unsigned char *p)
{
const unsigned char *marker = NULL;
const unsigned char *start = p;
/*!re2c
'data:image/' ('png'|'gif'|'jpeg'|'webp') { return 0; }
'javascript:' | 'vbscript:' | 'file:' | 'data:' { return (bufsize_t)(p - start); }
.? { return 0; }
*/
}
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