Improve URL autolinks extension. It is now much more compatible to Cmark-gfm. With the flag MD_FLAG_PERMISSIVEWWWAUTOLINKS, we now also support the WWW autolinks (when the http: scheme is omitted).
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443
diff --git a/md2html/md2html.c b/md2html/md2html.c
index 16f1beb..f631fae 100644
--- a/md2html/md2html.c
+++ b/md2html/md2html.c
@@ -198,6 +198,7 @@ static const option cmdline_options[] = {
{ "fverbatim-entities", 0, 'E', OPTION_ARG_NONE },
{ "fpermissive-atx-headers", 0, 'A', OPTION_ARG_NONE },
{ "fpermissive-url-autolinks", 0, 'U', OPTION_ARG_NONE },
+ { "fpermissive-www-autolinks", 0, '.', OPTION_ARG_NONE },
{ "fpermissive-email-autolinks", 0, '@', OPTION_ARG_NONE },
{ "fpermissive-autolinks", 0, 'V', OPTION_ARG_NONE },
{ "fno-indented-code", 0, 'I', OPTION_ARG_NONE },
@@ -238,10 +239,13 @@ usage(void)
" Allow ATX headers without delimiting space\n"
" --fpermissive-url-autolinks\n"
" Allow URL autolinks without '<', '>'\n"
+ " --fpermissive-www-autolinks\n"
+ " Allow WWW autolinks without any scheme (e.g. 'www.example.com')\n"
" --fpermissive-email-autolinks \n"
" Allow e-mail autolinks without '<', '>' and 'mailto:'\n"
" --fpermissive-autolinks\n"
- " Same as --fpermissive-url-autolinks --fpermissive-email-autolinks\n"
+ " Same as --fpermissive-url-autolinks --fpermissive-www-autolinks\n"
+ " --fpermissive-email-autolinks\n"
" --fno-indented-code\n"
" Disable indented code blocks\n"
" --fno-html-blocks\n"
@@ -293,6 +297,7 @@ cmdline_callback(int opt, char const* value, void* data)
case 'H': parser_flags |= MD_FLAG_NOHTML; break;
case 'W': parser_flags |= MD_FLAG_COLLAPSEWHITESPACE; break;
case 'U': parser_flags |= MD_FLAG_PERMISSIVEURLAUTOLINKS; break;
+ case '.': parser_flags |= MD_FLAG_PERMISSIVEWWWAUTOLINKS; break;
case '@': parser_flags |= MD_FLAG_PERMISSIVEEMAILAUTOLINKS; break;
case 'V': parser_flags |= MD_FLAG_PERMISSIVEAUTOLINKS; break;
case 'T': parser_flags |= MD_FLAG_TABLES; break;
diff --git a/md4c/md4c.c b/md4c/md4c.c
index 3681503..ce7cd8d 100644
--- a/md4c/md4c.c
+++ b/md4c/md4c.c
@@ -2154,8 +2154,9 @@ md_free_link_ref_defs(MD_CTX* ctx)
* '[': Maybe start of link label or link text.
* '!': Equivalent of '[' for image.
* ']': Maybe end of link label or link text.
- * ':': Maybe permissive URL auto-link (needs MD_FLAG_PERMISSIVEURLAUTOLINKS).
* '@': Maybe permissive e-mail auto-link (needs MD_FLAG_PERMISSIVEEMAILAUTOLINKS).
+ * ':': Maybe permissive URL auto-link (needs MD_FLAG_PERMISSIVEURLAUTOLINKS).
+ * '.': Maybe permissive WWW auto-link (needs MD_FLAG_PERMISSIVEWWWAUTOLINKS).
* 'D': Dummy mark, it reserves a space for splitting a previous mark
* (e.g. emphasis) or to make more space for storing some special data
* related to the preceding mark (e.g. link).
@@ -2414,11 +2415,14 @@ md_build_mark_char_map(MD_CTX* ctx)
if(ctx->r.flags & MD_FLAG_STRIKETHROUGH)
ctx->mark_char_map['~'] = 1;
+ if(ctx->r.flags & MD_FLAG_PERMISSIVEEMAILAUTOLINKS)
+ ctx->mark_char_map['@'] = 1;
+
if(ctx->r.flags & MD_FLAG_PERMISSIVEURLAUTOLINKS)
ctx->mark_char_map[':'] = 1;
- if(ctx->r.flags & MD_FLAG_PERMISSIVEEMAILAUTOLINKS)
- ctx->mark_char_map['@'] = 1;
+ if(ctx->r.flags & MD_FLAG_PERMISSIVEWWWAUTOLINKS)
+ ctx->mark_char_map['.'] = 1;
if(ctx->r.flags & MD_FLAG_TABLES)
ctx->mark_char_map['|'] = 1;
@@ -2613,6 +2617,20 @@ md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
continue;
}
+ /* A potential permissive e-mail autolink. */
+ if(ch == _T('@')) {
+ if(line->beg + 1 <= off && ISALNUM(off-1) &&
+ off + 3 < line->end && ISALNUM(off+1))
+ {
+ PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_OPENER);
+ /* Push a dummy as a reserve for a closer. */
+ PUSH_MARK('D', off, off, 0);
+ }
+
+ off++;
+ continue;
+ }
+
/* A potential permissive URL autolink. */
if(ch == _T(':')) {
static struct {
@@ -2624,8 +2642,7 @@ md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
/* In the order from the most frequently used, arguably. */
{ _T("http"), 4, _T("//"), 2 },
{ _T("https"), 5, _T("//"), 2 },
- { _T("mailto"), 6, NULL, 0 },
- { _T("ftp"), 3, _T("//"), 2 },
+ { _T("ftp"), 3, _T("//"), 2 }
};
int scheme_index;
@@ -2636,7 +2653,7 @@ md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
const SZ suffix_size = scheme_map[scheme_index].suffix_size;
if(line->beg + scheme_size <= off && md_ascii_eq(STR(off-scheme_size), scheme, scheme_size) &&
- (line->beg + scheme_size == off || ISWHITESPACE(off-scheme_size-1)) &&
+ (line->beg + scheme_size == off || ISWHITESPACE(off-scheme_size-1) || ISANYOF(off-scheme_size-1, _T("*_~(["))) &&
off + 1 + suffix_size < line->end && md_ascii_eq(STR(off+1), suffix, suffix_size))
{
PUSH_MARK(ch, off-scheme_size, off+1+suffix_size, MD_MARK_POTENTIAL_OPENER);
@@ -2651,14 +2668,17 @@ md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
continue;
}
- /* A potential permissive e-mail autolink. */
- if(ch == _T('@')) {
- if(line->beg + 1 <= off && ISALNUM(off-1) &&
- off + 3 < line->end && ISALNUM(off+1))
+ /* A potential permissive WWW autolink. */
+ if(ch == _T('.')) {
+ if(line->beg + 3 <= off && md_ascii_eq(STR(off-3), _T("www"), 3) &&
+ (line->beg + 3 == off || ISWHITESPACE(off-4) || ISANYOF(off-4, _T("*_~(["))) &&
+ off + 1 < line_end)
{
- PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_OPENER);
+ PUSH_MARK(ch, off-3, off+1, MD_MARK_POTENTIAL_OPENER);
/* Push a dummy as a reserve for a closer. */
PUSH_MARK('D', off, off, 0);
+ off++;
+ continue;
}
off++;
@@ -3285,38 +3305,63 @@ static void
md_analyze_permissive_url_autolink(MD_CTX* ctx, int mark_index)
{
MD_MARK* opener = &ctx->marks[mark_index];
- int closer_index;
- MD_MARK* closer;
+ int closer_index = mark_index + 1;
+ MD_MARK* closer = &ctx->marks[mark_index + 1];
+ MD_MARK* next_resolved_mark;
OFF off = opener->end;
+ int seen_dot = FALSE;
+ int seen_underscore_or_hyphen[2] = { FALSE, FALSE };
- if(off < ctx->size && ISALNUM(off))
- off++;
- else
+ /* Check for domain. */
+ while(off < ctx->size) {
+ if(ISALNUM(off)) {
+ off++;
+ } else if(CH(off) == _T('.')) {
+ seen_dot = TRUE;
+ seen_underscore_or_hyphen[0] = seen_underscore_or_hyphen[1];
+ seen_underscore_or_hyphen[1] = FALSE;
+ off++;
+ } else if(ISANYOF2(off, _T('-'), _T('_'))) {
+ seen_underscore_or_hyphen[1] = TRUE;
+ off++;
+ } else {
+ break;
+ }
+ }
+
+ if(off <= opener->end || !seen_dot || seen_underscore_or_hyphen[0] || seen_underscore_or_hyphen[1])
return;
- while(1) {
- while(off < ctx->size && (ISALNUM(off) || CH(off) == _T('/')))
- off++;
+ /* Check for path. */
+ next_resolved_mark = closer + 1;
+ while(next_resolved_mark->ch == 'D' || !(next_resolved_mark->flags & MD_MARK_RESOLVED))
+ next_resolved_mark++;
+ while(off < next_resolved_mark->beg && CH(off) != _T('<') && !ISWHITESPACE(off) && !ISNEWLINE(off))
+ off++;
- /* We need to be relatively careful to not include too much into the URL.
- * Consider e.g. a dot or question mark:
- * "Go to http://example.com." versus "http://example.com.uk"
- * "Do you know http://zombo.com?" versus "http://example.com/?page=2"
- * Therefore we include some named punctuation characters only if they
- * are immediately followed by alnum char.
- */
- if(off + 1 < ctx->size && ISANYOF(off, _T("@.?=&%+-_#")) && ISALNUM(off+1))
- off += 2;
- else
- break;
+ /* Path validation. */
+ if(ISANYOF(off-1, _T("?!.,:*_~)"))) {
+ if(CH(off-1) != _T(')')) {
+ off--;
+ } else {
+ int parenthesis_balance = 0;
+ OFF tmp;
+
+ for(tmp = opener->end; tmp < off; tmp++) {
+ if(CH(tmp) == _T('('))
+ parenthesis_balance++;
+ else if(CH(tmp) == _T(')'))
+ parenthesis_balance--;
+ }
+
+ if(parenthesis_balance < 0)
+ off--;
+ }
}
/* Ok. Lets call it auto-link. Adapt opener and create closer to zero
* length so all the contents becomes the link text. */
- closer_index = mark_index + 1;
- closer = &ctx->marks[closer_index];
MD_ASSERT(closer->ch == 'D');
-
opener->end = opener->beg;
closer->ch = opener->ch;
closer->beg = off;
@@ -3436,6 +3481,7 @@ md_analyze_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF en
case '*': md_analyze_asterisk(ctx, i); break;
case '_': md_analyze_underscore(ctx, i); break;
case '~': md_analyze_tilde(ctx, i); break;
+ case '.': /* Pass through. */
case ':': md_analyze_permissive_url_autolink(ctx, i); break;
case '@': md_analyze_permissive_email_autolink(ctx, i); break;
}
@@ -3494,7 +3540,7 @@ abort:
static void
md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF end)
{
- md_analyze_marks(ctx, lines, n_lines, beg, end, _T("*_~@:"));
+ md_analyze_marks(ctx, lines, n_lines, beg, end, _T("*_~@:."));
ASTERISK_OPENERS.head = -1;
ASTERISK_OPENERS.tail = -1;
UNDERSCORE_OPENERS.head = -1;
@@ -3645,16 +3691,19 @@ md_process_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
case '@': /* Permissive e-mail autolink. */
case ':': /* Permissive URL autolink. */
+ case '.': /* Permissive WWW autolink. */
{
const MD_MARK* opener = ((mark->flags & MD_MARK_OPENER) ? mark : &ctx->marks[mark->prev]);
const MD_MARK* closer = &ctx->marks[opener->next];
const CHAR* dest = STR(opener->end);
SZ dest_size = closer->beg - opener->end;
- if(opener->ch == '@') {
+ if(opener->ch == '@' || opener->ch == '.') {
dest_size += 7;
MD_TEMP_BUFFER(dest_size * sizeof(CHAR));
- memcpy(ctx->buffer, _T("mailto:"), 7 * sizeof(CHAR));
+ memcpy(ctx->buffer,
+ (opener->ch == '@' ? _T("mailto:") : _T("http://")),
+ 7 * sizeof(CHAR));
memcpy(ctx->buffer + 7, dest, (dest_size-7) * sizeof(CHAR));
dest = ctx->buffer;
}
diff --git a/md4c/md4c.h b/md4c/md4c.h
index a58cc74..cd578ca 100644
--- a/md4c/md4c.h
+++ b/md4c/md4c.h
@@ -262,13 +262,15 @@ typedef struct MD_SPAN_IMG_DETAIL {
#define MD_FLAG_PERMISSIVEATXHEADERS 0x0002 /* Do not require space in ATX headers ( ###header ) */
#define MD_FLAG_PERMISSIVEURLAUTOLINKS 0x0004 /* Recognize URLs as autolinks even without '<', '>' */
#define MD_FLAG_PERMISSIVEEMAILAUTOLINKS 0x0008 /* Recognize e-mails as autolinks even without '<', '>' and 'mailto:' */
-#define MD_FLAG_PERMISSIVEAUTOLINKS (MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEEMAILAUTOLINKS)
#define MD_FLAG_NOINDENTEDCODEBLOCKS 0x0010 /* Disable indented code blocks. (Only fenced code works.) */
#define MD_FLAG_NOHTMLBLOCKS 0x0020 /* Disable raw HTML blocks. */
#define MD_FLAG_NOHTMLSPANS 0x0040 /* Disable raw HTML (inline). */
-#define MD_FLAG_NOHTML (MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS)
#define MD_FLAG_TABLES 0x0100 /* Enable tables extension. */
#define MD_FLAG_STRIKETHROUGH 0x0200 /* Enable strikethrough extension. */
+#define MD_FLAG_PERMISSIVEWWWAUTOLINKS 0x0400 /* Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */
+
+#define MD_FLAG_PERMISSIVEAUTOLINKS (MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEWWWAUTOLINKS)
+#define MD_FLAG_NOHTML (MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS)
/* Convenient sets of flags corresponding to well-known Markdown dialects.
* Note we may only support subset of features of the referred dialect.
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index 8dd42be..72bc75c 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -34,5 +34,6 @@ $PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/coverage.txt" -p "$PROGRAM"
# Test various extensions and deviations from the specifications:
$PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/permissive-email-autolinks.txt" -p "$PROGRAM --fpermissive-email-autolinks"
$PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/permissive-url-autolinks.txt" -p "$PROGRAM --fpermissive-url-autolinks"
+$PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/permissive-www-autolinks.txt" -p "$PROGRAM --fpermissive-www-autolinks"
$PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/tables.txt" -p "$PROGRAM --ftables"
$PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/strikethrough.txt" -p "$PROGRAM --fstrikethrough"
diff --git a/test/permissive-url-autolinks.txt b/test/permissive-url-autolinks.txt
index 4b42f95..000a86f 100644
--- a/test/permissive-url-autolinks.txt
+++ b/test/permissive-url-autolinks.txt
@@ -22,8 +22,7 @@ Homepage: https://github.com/mity/md4c
````````````````````````````````
But this permissive autolink feature can work only for very widely used URL
-schemes, in alphabetical order `ftp:`, `http:`, `https:` and `mailto:`,
-so this is not an permissive autolink.
+schemes, in alphabetical order `ftp:`, `http:`, `https:`.
That's why this is not a permissive autolink:
@@ -33,12 +32,8 @@ ssh://root@example.com
<p>ssh://root@example.com</p>
````````````````````````````````
-As certain characters (`.`, `?`, `=`, `&`, `%`, `+`, `-`, `_`, `#`, `@`) can collide
-with a normal text flow, they are not recognized as part of the URL unless another
-alphanumeric character immediately follows.
-
-Therefore the question mark in this question is not part of the autolink's
-contents:
+The same rules for path validation as for permissivve WWW autolinks apply.
+Therefore the final question mark here is not part of the autolink:
```````````````````````````````` example
Have you ever visited http://www.zombo.com?
@@ -54,19 +49,16 @@ http://www.bing.com/search?q=md4c
<p><a href="http://www.bing.com/search?q=md4c">http://www.bing.com/search?q=md4c</a></p>
````````````````````````````````
-Please note that e-mail addresses without the `mailto:` scheme are not permissive URL
-autolinks, but MD4C implements another extension `MD_FLAG_PERMISSIVEEMAILAUTOLINKS`
-which can be used to enable that too.
+And finally one complex example:
```````````````````````````````` example
-mailto:john.doe@example.com
-.
-<p><a href="mailto:john.doe@example.com">mailto:john.doe@example.com</a></p>
-````````````````````````````````
+http://commonmark.org
-```````````````````````````````` example
-john.doe@example.com
+(Visit https://encrypted.google.com/search?q=Markup+(business))
+
+Anonymous FTP is available at ftp://foo.bar.baz.
.
-<p>john.doe@example.com</p>
+<p><a href="http://commonmark.org">http://commonmark.org</a></p>
+<p>(Visit <a href="https://encrypted.google.com/search?q=Markup+(business)">https://encrypted.google.com/search?q=Markup+(business)</a>)</p>
+<p>Anonymous FTP is available at <a href="ftp://foo.bar.baz">ftp://foo.bar.baz</a>.</p>
````````````````````````````````
-
diff --git a/test/permissive-www-autolinks.txt b/test/permissive-www-autolinks.txt
new file mode 100644
index 0000000..ec076c3
--- /dev/null
+++ b/test/permissive-www-autolinks.txt
@@ -0,0 +1,92 @@
+
+# Permissive WWW Autolinks
+
+With the flag `MD_FLAG_PERMISSIVEWWWAUTOLINKS`, MD4C enables recognition of
+autolinks starting with `www.`, even if they do not exactly follow the syntax
+of autolink as specified in CommonMark specification.
+
+These do not have to be enclosed in `<` and `>`, and they even do not need
+any preceding scheme specification.
+
+The WWW autolink will be recognized when a valid domain is found.
+
+A valid domain consists of the text `www.`, followed by alphanumeric characters,
+nderscores (`_`), hyphens (`-`) and periods (`.`). There must be at least one
+period, and no underscores may be present in the last two segments of the domain.
+
+The scheme `http` will be inserted automatically:
+
+```````````````````````````````` example
+www.commonmark.org
+.
+<p><a href="http://www.commonmark.org">www.commonmark.org</a></p>
+````````````````````````````````
+
+After a valid domain, zero or more non-space non-`<` characters may follow:
+
+```````````````````````````````` example
+Visit www.commonmark.org/help for more information.
+.
+<p>Visit <a href="http://www.commonmark.org/help">www.commonmark.org/help</a> for more information.</p>
+````````````````````````````````
+
+We then apply extended autolink path validation as follows:
+
+Trailing punctuation (specifically, `?`, `!`, `.`, `,`, `:`, `*`, `_`, and `~`)
+will not be considered part of the autolink, though they may be included in the
+interior of the link:
+
+```````````````````````````````` example
+Visit www.commonmark.org.
+
+Visit www.commonmark.org/a.b.
+.
+<p>Visit <a href="http://www.commonmark.org">www.commonmark.org</a>.</p>
+<p>Visit <a href="http://www.commonmark.org/a.b">www.commonmark.org/a.b</a>.</p>
+````````````````````````````````
+
+When an autolink ends in `)`, we scan the entire autolink for the total number
+of parentheses. If there is a greater number of closing parentheses than
+opening ones, we don't consider the last character part of the autolink, in
+order to facilitate including an autolink inside a parenthesis:
+
+```````````````````````````````` example
+www.google.com/search?q=Markup+(business)
+
+(www.google.com/search?q=Markup+(business))
+.
+<p><a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a></p>
+<p>(<a href="http://www.google.com/search?q=Markup+(business)">www.google.com/search?q=Markup+(business)</a>)</p>
+````````````````````````````````
+
+This check is only done when the link ends in a closing parentheses `)`, so if
+the only parentheses are in the interior of the autolink, no special rules are
+applied:
+
+```````````````````````````````` example
+www.google.com/search?q=(business))+ok
+.
+<p><a href="http://www.google.com/search?q=(business))+ok">www.google.com/search?q=(business))+ok</a></p>
+````````````````````````````````
+
+If an autolink ends in a semicolon (`;`), we check to see if it appears to
+resemble an [entity reference][entity references]; if the preceding text is `&`
+followed by one or more alphanumeric characters. If so, it is excluded from
+the autolink:
+
+```````````````````````````````` example
+www.google.com/search?q=commonmark&hl=en
+
+www.google.com/search?q=commonmark&hl;
+.
+<p><a href="http://www.google.com/search?q=commonmark&hl=en">www.google.com/search?q=commonmark&hl=en</a></p>
+<p><a href="http://www.google.com/search?q=commonmark">www.google.com/search?q=commonmark</a>&hl;</p>
+````````````````````````````````
+
+`<` immediately ends an autolink.
+
+```````````````````````````````` example
+www.commonmark.org/he<lp
+.
+<p><a href="http://www.commonmark.org/he">www.commonmark.org/he</a><lp</p>
+````````````````````````````````