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from.php
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<?php
namespace x\markdown {
function from(?string $value, $block = true): ?string {
if (!$block) {
[$row] = from\row($value);
if (!$row) {
return null;
}
if (\is_string($row)) {
$value = \trim(\preg_replace('/\s+/', ' ', $row));
return "" !== $value ? $value : null;
}
foreach ($row as &$v) {
$v = \is_array($v) ? from\s($v) : $v;
}
$value = \trim(\preg_replace('/\s+/', ' ', \implode("", $row)));
return "" !== $value ? $value : null;
}
[$rows] = from\rows($value);
if (!$rows) {
return null;
}
foreach ($rows as &$row) {
$row = \is_array($row) ? from\s($row) : $row;
}
if ("" === ($value = \implode("", $rows))) {
return null;
}
return \strtr($value, ['</dl><dl>' => ""]);
}
}
namespace x\markdown\from {
function a(?string $info, $raw = false) {
if ("" === ($info = \trim($info ?? ""))) {
return $raw ? [] : null;
}
$a = [];
$class = [];
$id = null;
if ('{' === $info[0] && '}' === \substr($info, -1)) {
if ("" === ($info = \trim(\substr($info, 1, -1)))) {
return $raw ? [] : null;
}
$pattern = '/([#.](?>\\\\.|[\w:-])+|(?>[\w:.-]+(?>=(?>' . q('"') . '|' . q("'") . '|\S+)?)?))/';
foreach (\preg_split($pattern, $info, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY) as $v) {
if ("" === \trim($v)) {
continue; // Skip the space(s)
}
// `{#a}`
if ('#' === $v[0]) {
$id = $id ?? \substr($v, 1);
continue;
}
// `{.a}`
if ('.' === $v[0]) {
$class[] = \substr($v, 1);
continue;
}
// `{a=b}`
if (false !== \strpos($v, '=')) {
$v = \explode('=', $v, 2);
// `{a=}`
if ("" === $v[1]) {
$a[$v[0]] = "";
continue;
}
// `{a="b"}` or `{a='b'}`
if ('"' === $v[1][0] || "'" === $v[1][0]) {
$v[1] = v(\substr($v[1], 1, -1));
// `{a=false}`
} else if ('false' === $v[1]) {
$v[1] = false;
// `{a=true}`
} else if ('true' === $v[1]) {
$v[1] = true;
// `{a=null}`
} else if ('null' === $v[1]) {
$v[1] = null;
}
if ('class' === $v[0]) {
$class[] = $v[1]; // Merge class value(s)
continue;
}
$a[$v[0]] = $v[1];
continue;
}
// `{a}`
$a[$v] = true;
}
if ($class = \array_unique($class)) {
\sort($class);
$a['class'] = \implode(' ', $class);
}
if ($id) {
$a['id'] = $id;
}
$a && \ksort($a);
if ($raw) {
return $a;
}
$out = [];
foreach ($a as $k => $v) {
$out[] = true === $v ? $k : $k . '="' . e($v) . '"';
}
return $out ? ' ' . \implode(' ', $out) : null;
}
foreach (\preg_split('/\s+|(?=[#.])/', $info, -1, \PREG_SPLIT_NO_EMPTY) as $v) {
if ('#' === $v[0]) {
$id = $id ?? \substr($v, 1);
continue;
}
if ('.' === $v[0]) {
$class[] = \substr($v, 1);
continue;
}
$class[] = 'language-' . $v;
}
if ($class = \array_unique($class)) {
\sort($class);
$a['class'] = \implode(' ', $class);
}
if ($id) {
$a['id'] = $id;
}
$a && \ksort($a);
if ($raw) {
return $a;
}
$out = [];
foreach ($a as $k => $v) {
$out[] = $k . '="' . e($v) . '"';
}
if ($out) {
\sort($out);
return ' ' . \implode(' ', $out);
}
return null;
}
function abbr(string $row, array &$lot = []) {
// Optimize if current row is an abbreviation
if (isset($lot[1][$row])) {
$title = $lot[1][$row];
return [['abbr', e($row), ['title' => "" !== $title ? $title : null], -1]];
}
// Else, chunk current row by abbreviation
$abbr = [];
if (!empty($lot[1])) {
foreach ($lot[1] as $k => $v) {
$abbr[] = \preg_quote($k, '/');
}
}
if ($abbr) {
$chops = [];
foreach (\preg_split('/\b(' . \implode('|', $abbr) . ')\b/', $row, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY) as $v) {
if (isset($lot[1][$v])) {
$title = $lot[1][$v];
$chops[] = ['abbr', e($v), ['title' => "" !== $title ? $title : null], -1];
continue;
}
$chops[] = e($v);
}
return $chops;
}
return $row;
}
function d(?string $v, $as = \ENT_HTML5 | \ENT_QUOTES) {
return \html_entity_decode($v ?? "", $as, 'UTF-8');
}
function e(?string $v, $as = \ENT_HTML5 | \ENT_QUOTES) {
return \htmlspecialchars($v ?? "", $as, 'UTF-8');
}
function l(?string $link) {
// ``
if (!$link) {
return true;
}
// `asdf` or `../asdf` or `/asdf` or `?asdf` or `#asdf`
if (0 !== \strpos($link, '//') && (false === \strpos($link, '://') || false !== \strpos('./?#', $link[0]))) {
return true;
}
// `//127.0.0.1` or `*://127.0.0.1`
if (\parse_url($link, \PHP_URL_HOST) === ($_SERVER['HTTP_HOST'] ?? 0)) {
return true;
}
return false;
}
function m($row) {
if (!$row || !\is_array($row)) {
return $row;
}
if (1 === ($count = \count($row))) {
if (\is_string($v = \reset($row))) {
return $v;
}
if (\is_array($v) && false === $v[0] && \is_string($v[1])) {
return $v[1];
}
}
// Concatenate a series of string(s) into one string
foreach ($row = \array_values($row) as $k => $v) {
if (\is_string($row[$k - 1] ?? 0) && \is_string($v)) {
$row[$k - 1] .= $v;
unset($row[$k]);
continue;
}
}
if (1 === \count($row = \array_values($row))) {
if (\is_string($v = \reset($row))) {
return $v;
}
if (\is_array($v) && false === $v[0] && \is_string($v[1])) {
return $v[1];
}
}
return $row;
}
function of(?string $row): array {
if ("" === ($row ?? "")) {
return [null, $row, [], 0];
}
$dent = \strspn($row, ' ');
if ($dent >= 4) {
return ['pre', \substr($row, 4), [], $dent, [1]];
}
// Remove indent(s)
$row = \substr($row, $dent);
if ("" === $row) {
return [null, $row, [], $dent];
}
if (false !== \strpos($row, '|')) {
return ['table', $row, [], $dent];
}
// `!…`
if (0 === \strpos($row, '!')) {
if (
// ` > 0 ||
// `![asdf][…`
\strpos($row, '][') > 0 ||
// `![asdf]` not followed by a `:`
false !== ($n = \strpos($row, ']')) && ':' !== \substr($row, $n + 1, 1)
) {
// `…)` or `…]` or `…}`
if (false !== \strpos(')]}', \substr($row, -1))) {
return ['figure', $row, [], $dent];
}
}
return ['p', $row, [], $dent];
}
// `#…`
if (0 === \strpos($row, '#')) {
$n = \strspn($row, '#');
// `#######…`
if ($n > 6) {
return ['p', $row, [], $dent];
}
// `# …`
if ($n === \strlen($row) || ' ' === \substr($row, $n, 1)) {
return ['h' . $n, $row, [], $dent, ['#', $n]];
}
return ['p', $row, [], $dent];
}
// `*…`
if ('*' === \rtrim($row)) {
return ['ul', $row, [], $dent, [$row[0], 2]];
}
if (0 === \strpos($row, '*')) {
// `*[…`
if (1 === \strpos($row, '[') && false === \strpos($row, '](') && false === \strpos($row, '][')) {
return [1, $row, [], $dent];
}
// `***`
$test = \strtr($row, [' ' => ""]);
if (\strspn($test, '*') === ($n = \strlen($test)) && $n > 2) {
return ['hr', $row, [], $dent, ['*', $n]];
}
// `* …`
if (' ' === \substr($row, 1, 1)) {
$r = \strspn($row, ' ', 1);
return ['ul', $row, [], $dent, [$row[0], 1 + ($r > 3 ? 3 : $r)]];
}
return ['p', $row, [], $dent];
}
// `+`
if ('+' === \rtrim($row)) {
return ['ul', $row, [], $dent, [$row[0], 2]];
}
// `+…`
if (0 === \strpos($row, '+')) {
// `+ …`
if (' ' === \substr($row, 1, 1)) {
$r = \strspn($row, ' ', 1);
return ['ul', $row, [], $dent, [$row[0], 1 + ($r > 3 ? 3 : $r)]];
}
return ['p', $row, [], $dent];
}
// `-`
if ('-' === \rtrim($row)) {
return ['ul', $row, [], $dent, [$row[0], 2]];
}
// `--`
if ('--' === \rtrim($row)) {
return ['h2', $row, [], $dent, ['-', 2]]; // Look like a Setext-header level 2
}
// `-…`
if (0 === \strpos($row, '-')) {
// `---`
$test = \strtr($row, [' ' => ""]);
if (\strspn($test, '-') === ($n = \strlen($test)) && $n > 2) {
return ['hr', $row, [], $dent, ['-', $n]];
}
// `- …`
if (' ' === \substr($row, 1, 1)) {
$r = \strspn($row, ' ', 1);
return ['ul', $row, [], $dent, [$row[0], 1 + ($r > 3 ? 3 : $r)]];
}
return ['p', $row, [], $dent];
}
// `:…`
if (0 === \strpos($row, ':')) {
// `: …`
if (' ' === \substr($row, 1, 1)) {
return ['dl', $row, [], $dent, [$row[0], 1 + \strspn($row, ' ', 1)]]; // Look like a definition list
}
return ['p', $row, [], $dent];
}
// `<…`
if (0 === \strpos($row, '<') && ' ' !== ($row[1] ?? 0)) {
// <https://spec.commonmark.org/0.31.2#html-blocks>
if ($t = \rtrim(\strtok(\substr($row, 1), " \n>"), '/')) {
// `<!--…`
if (0 === \strpos($t, '!--')) {
return [false, $row, [], $dent, [2, \substr($t, 0, 3)]]; // `!--asdf` → `!--`
}
// `<![CDATA[…`
if (0 === \strpos($t, '![CDATA[')) {
return [false, $row, [], $dent, [5, \substr($t, 0, 8)]]; // `![CDATA[asdf` → `![CDATA[`
}
if ('!' === $t[0]) {
return \preg_match('/^[a-z]/i', \substr($t, 1)) ? [false, $row, [], $dent, [4, $t]] : ['p', $row, [], $dent];
}
if ('?' === $t[0]) {
return [false, $row, [], $dent, [3, '?' . \trim($t, '?')]];
}
// The `:` and `@` character is not a valid part of a HTML element name, so it must be a link syntax
// <https://spec.commonmark.org/0.30#tag-name>
if (false !== \strpos($t, ':') || false !== \strpos($t, '@')) {
return ['p', $row, [], $dent];
}
if (false !== \stripos(',pre,script,style,textarea,', ',' . \trim($t, '/') . ',')) {
return [false, $row, [], $dent, [1, $t]];
}
if (false !== \stripos(',address,article,aside,base,basefont,blockquote,body,caption,center,col,colgroup,dd,details,dialog,dir,div,dl,dt,fieldset,figcaption,figure,footer,form,frame,frameset,h1,h2,h3,h4,h5,h6,head,header,hr,html,iframe,legend,li,link,main,menu,menuitem,nav,noframes,ol,optgroup,option,p,param,search,section,source,summary,table,tbody,td,tfoot,th,thead,title,tr,track,ul,', ',' . \trim($t, '/') . ',')) {
return [false, $row, [], $dent, [6, $t]];
}
// <https://spec.commonmark.org/0.31.2#example-163>
if ('>' === \substr($test = \rtrim($row), -1)) {
// <https://spec.commonmark.org/0.31.2#closing-tag>
if ('/' === $test[1] && \preg_match('/^<\/[a-z][a-z\d-]*\s*>$/i', $test)) {
return [false, $row, [], $dent, [7, $t]];
}
// <https://spec.commonmark.org/0.31.2#open-tag>
if (\preg_match('/^<[a-z][a-z\d-]*(\s+[a-z:_][\w.:-]*(\s*=\s*(?>"[^"]*"|\'[^\']*\'|[^\s"\'<=>`]+)?)?)*\s*\/?>$/i', $test)) {
return [false, $row, [], $dent, [7, $t]];
}
return ['p', $row, [], $dent];
}
}
return ['p', $row, [], $dent];
}
// `=…`
if (0 === \strpos($row, '=')) {
if (\strspn($row, '=') === \strlen($row)) {
return ['h1', $row, [], $dent, ['=', 1]]; // Look like a Setext-header level 1
}
return ['p', $row, [], $dent];
}
// `>…`
if (0 === \strpos($row, '>')) {
return ['blockquote', $row, [], $dent];
}
// `[…`
if (0 === \strpos($row, '[')) {
if (1 === \strpos($row, '^')) {
return [2, $row, [], $dent];
}
if (
// `[asdf](…`
\strpos($row, '](') > 0 ||
// `[asdf][…`
\strpos($row, '][') > 0 ||
// `[asdf]` not followed by a `:`
false !== ($n = \strpos($row, ']')) && ':' !== \substr($row, $n + 1, 1)
) {
return ['p', $row, [], $dent];
}
return [0, $row, [], $dent];
}
// `_…`
if (0 === \strpos($row, '_')) {
// `___`
$test = \strtr($row, [' ' => ""]);
if (\strspn($test, '_') === ($n = \strlen($test)) && $n > 2) {
return ['hr', $row, [], $dent, ['_', $n]];
}
return ['p', $row, [], $dent];
}
// ``…`
if (0 === \strpos($row, '`') && ($n = \strspn($row, '`')) >= 3) {
$info = \trim(\substr($row, $n));
// <https://spec.commonmark.org/0.30#example-145>
if (false !== \strpos($info, '`')) {
return ['p', $row, [], $dent];
}
return ['pre', $row, a($info, true), $dent, [2, $n]];
}
// `~…`
if (0 === \strpos($row, '~') && ($n = \strspn($row, '~')) >= 3) {
$info = \trim(\substr($row, $n));
return ['pre', $row, a($info, true), $dent, [3, $n]];
}
// `1…`
$n = \strspn($row, '0123456789');
// <https://spec.commonmark.org/0.30#example-266>
if ($n > 9) {
return ['p', $row, [], $dent];
}
// `1)` or `1.`
if ($n && ($n + 1) === \strlen($v = \rtrim($row)) && false !== \strpos(').', \substr($v, -1))) {
$start = (int) \substr($row, 0, $n);
return ['ol', $row, ['start' => 1 !== $start ? $start : null], $dent, [\substr($row, -1), $n + 2, $start]];
}
// `1) …` or `1. …`
if (false !== \strpos(').', \substr($row, $n, 1)) && ' ' === \substr($row, $n + 1, 1)) {
$r = \strspn($row, ' ', $n + 1);
$start = (int) \substr($row, 0, $n);
return ['ol', $row, ['start' => 1 !== $start ? $start : null], $dent, [\substr($row, $n, 1), $n + 1 + ($r > 3 ? 3 : $r), $start]];
}
return ['p', $row, [], $dent];
}
function q(string $char = '"', $key = false, string $before = "", string $x = ""): string {
$a = \preg_quote($char[0], '/');
$b = \preg_quote($char[1] ?? $char[0], '/');
$c = $a . ($b === $a ? "" : $b);
return '(?>' . $a . ($key ? '(' . (\is_string($key) ? '?<' . $key . '>' : "") : "") . '(?>' . ($before ? $before . '|' : "") . '[^' . $c . $x . '\\\\]|\\\\.)*+' . ($key ? ')' : "") . $b . ')';
}
function r(string $char = '[]', $key = false, string $before = "", string $x = ""): string {
$a = \preg_quote($char[0], '/');
$b = \preg_quote($char[1] ?? $char[0], '/');
$c = $a . ($b === $a ? "" : $b);
return '(?>' . $a . ($key ? '(' . (\is_string($key) ? '?<' . $key . '>' : "") : "") . '(?>' . ($before ? $before . '|' : "") . '[^' . $c . $x . '\\\\]|\\\\.|(?R))*+' . ($key ? ')' : "") . $b . ')';
}
function raw(?string $value, $block = true): array {
return $block ? rows($value) : row($value);
}
function row(?string $value, array &$lot = []) {
if ("" === \trim($value ?? "")) {
return [[], $lot];
}
$chops = [];
$is_img = isset($lot['is']['img']);
$is_table = isset($lot['is']['table']);
$notes = $lot['notes'] ?? [];
while (false !== ($chop = \strpbrk($value, "\\" . '<`' . ($is_table ? '|' : "") . '*_![&' . "\n"))) {
if ("" !== ($v = \strstr($value, $c = $chop[0], true))) {
if (\is_array($abbr = abbr($v, $lot))) {
$chops = \array_merge($chops, $abbr);
} else {
$chops[] = e($v);
}
$value = $chop;
}
if ("\\" === $c) {
if ("\\" === \trim($chop)) {
$chops[] = "\\";
$value = "";
// A back-slash is not a hard break when it is at the end of a paragraph block
break;
}
// <https://spec.commonmark.org/0.31.2#example-644>
if ("\n" === ($chop[1] ?? 0)) {
$chops[] = ['br', false, [], -1, ["\\", 1]];
$value = \ltrim(\substr($chop, 2));
continue;
}
// Un-escape a character
$chops[] = e(\substr($chop, 1, 1));
$value = \substr($chop, 2);
continue;
}
if ("\n" === $c) {
$v = $chops[$n = \count($chops) - 1] ?? [];
if (\is_string($v) && ' ' === \substr($v, -2)) {
$chops[$n] = \rtrim($v);
$chops[] = ['br', false, [], -1, [' ', 2]];
$value = \ltrim(\substr($chop, 1));
continue;
}
// Collapse current line to the previous line
$chops[] = ' ';
$value = \substr($chop, 1);
continue;
}
if ('!' === $c) {
if ('[' !== ($chop[1] ?? 0)) {
$chops[] = $c;
$value = \substr($chop, 1);
continue;
}
$lot['is']['img'] = 1;
$test = row(\substr($chop, 1), $lot)[0][0];
unset($lot['is']['img']);
if (\is_array($test) && 'a' === $test[0]) {
$test[0] = 'img';
if (\is_array($test[1])) {
$alt = "";
foreach ($test[1] as $v) {
// <https://spec.commonmark.org/0.30#example-573>
if (\is_array($v) && 'img' === $v[0]) {
$alt .= $v[2]['alt'] ?? "";
continue;
}
$alt .= \is_array($v) ? s($v) : $v;
}
} else {
$alt = $test[1];
}
$test[1] = false;
// <https://spec.commonmark.org/0.30#example-572>
$test[2]['alt'] = \trim(\strip_tags($alt));
$test[2]['src'] = $test[2]['href'];
$test[4][1] = '!' . $test[4][1];
unset($test[2]['href'], $test[2]['rel'], $test[2]['target']);
$chops[] = $test;
$value = \substr($chop, \strlen($test[4][1]));
continue;
}
$chops[] = $c;
$value = \substr($chop, 1);
continue;
}
if ('&' === $c) {
if (false === ($n = \strpos($chop, ';')) || $n < 2 || !\preg_match('/^&(?>#x[a-f\d]{1,6}|#\d{1,7}|[a-z][a-z\d]{1,31});/i', $chop, $m)) {
$chops[] = e('&');
$value = \substr($chop, 1);
continue;
}
// <https://spec.commonmark.org/0.30#example-26>
if ('�' === $m[0]) {
$m[0] = '�';
}
$chops[] = ['&', $m[0], [], -1];
$value = \substr($chop, \strlen($m[0]));
continue;
}
if ('*' === $c) {
$contains = '`[^`]+`|\\\\.|[^*' . ($is_table ? '|' : "") . ']';
if (
// Prefer `<em><strong>…</strong></em>`
\preg_match('/^((\*)((\*\*)(?!\s)(?>' . $contains . ')++(?<!\s)\4)\2)/', $chop, $m) ||
\preg_match('/^((\*\*)(?!\s)((?>' . $contains . '|(\*)(?!\s)(?>' . $contains . ')+?(?<!\s)\4|\B\2(?!\s)(?>' . $contains . ')+?(?<!\s)\2\B)++)(?<!\s)\2)/', $chop, $m) ||
\preg_match('/^((\*)(?!\s)((?>' . $contains . '|(\*\*)(?!\s)(?>' . $contains . ')+?(?<!\s)\4|\B\2(?!\s)(?>' . $contains . ')+?(?<!\s)\2\B)++)(?<!\s)\2)/', $chop, $m)
) {
// <https://spec.commonmark.org/0.31.2#example-521>
if (false !== ($n = \strpos($m[0], '[')) && (false === \strpos($m[0], ']') || !\preg_match('/' . r('[]') . '/', $m[0]))) {
$chops[] = e(\substr($chop, 0, $n));
$value = \substr($chop, $n);
continue;
}
$chops[] = [1 === ($n = \strlen($m[2])) ? 'em' : 'strong', row($m[3], $lot)[0], [], -1, [$c, $n]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
$chops[] = e(\substr($chop, 0, $n = \strspn($chop, $c)));
$value = \substr($chop, $n);
continue;
}
if ('<' === $c) {
// <https://spec.commonmark.org/0.31.2#processing-instruction>
if (0 === \strpos($chop, '<' . '?') && ($n = \strpos($chop, '?' . '>')) > 1) {
$v = \strtr(\substr($chop, 0, $n += 2), "\n", ' ');
$chops[] = [false, $v, [], -1, [3, '?' . \trim(\strtok(\substr($v, 1), ' >'), '?')]];
$value = \substr($chop, $n);
continue;
}
// <https://spec.commonmark.org/0.31.2#html-comment>
if (0 === \strpos($chop, '<!--') && ($n = \strpos($chop, '-->')) > 1) {
$chops[] = [false, \strtr(\substr($chop, 0, $n += 3), "\n", ' '), [], -1, [2, '!--']];
$value = \substr($chop, $n);
continue;
}
// <https://spec.commonmark.org/0.31.2#cdata-section>
if (0 === \strpos($chop, '<![CDATA[') && ($n = \strpos($chop, ']]>')) > 8) {
$chops[] = [false, \strtr(\substr($chop, 0, $n += 3), "\n", ' '), [], -1, [5, '![CDATA[']];
$value = \substr($chop, $n);
continue;
}
$test = (string) \strstr($chop, '>', true);
// <https://github.com/commonmark/commonmark.js/blob/df3ea1e80d98fce5ad7c72505f9230faa6f23492/lib/inlines.js#L73>
if (\strpos($test, '@') > 0 && \preg_match('/^<([a-z\d!#$%&\'*+.\/=?^_`{|}~-]+@[a-z\d](?>[a-z\d-]{0,61}[a-z\d])?(?>\.[a-z\d](?>[a-z\d-]{0,61}[a-z\d])?)*)>/i', $chop, $m)) {
// <https://spec.commonmark.org/0.30#example-605>
if (false !== \strpos($email = $m[1], '\\')) {
$chops[] = e($m[0]);
$value = \substr($chop, \strlen($m[0]));
continue;
}
$chops[] = ['a', e($m[1]), ['href' => u('mailto:' . $email)], -1, [false, $m[0]]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
// <https://github.com/commonmark/commonmark.js/blob/df3ea1e80d98fce5ad7c72505f9230faa6f23492/lib/inlines.js#L75>
if (\strpos($test, ':') > 1 && \preg_match('/^<([a-z][a-z\d.+-]{1,31}:(?>' . ($is_table ? '\\\\\||[^|' : '[^') . '<>\x00-\x20])*)>/i', $chop, $m)) {
$rel = $target = null;
if (!l($link = $is_table ? \strtr($m[1], ["\\|" => '|']) : $m[1])) {
$rel = 'nofollow';
$target = '_blank';
}
$chops[] = ['a', e($link), [
'href' => u($link),
'rel' => $rel,
'target' => $target
], -1, [false, $m[0]]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
// <https://spec.commonmark.org/0.31.2#closing-tag>
if ('/' === $chop[1] && \preg_match('/^<(\/[a-z][a-z\d-]*)\s*>/i', $chop, $m)) {
$chops[] = [false, $m[0], [], -1, [7, $m[1]]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
// <https://spec.commonmark.org/0.31.2#open-tag>
if (\preg_match('/^<([a-z][a-z\d-]*)(\s+[a-z:_][\w.:-]*(\s*=\s*(?>"[^"]*"|\'[^\']*\'|[^' . ($is_table ? '|' : "") . '\s"\'<=>`]+)?)?)*\s*\/?>/i', $chop, $m)) {
$chops[] = [false, $m[0], [], -1, [7, $m[1]]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
$chops[] = e('<');
$value = \substr($chop, 1);
continue;
}
if ('[' === $c) {
$contains = '`[^`]+`';
$data = $key = $link = $title = null;
// `[asdf]…`
if (\preg_match('/' . r('[]', true, $contains, $is_table ? '|' : "") . '/', $chop, $m, \PREG_OFFSET_CAPTURE)) {
if ($m[0][1] > 0) {
$chops[] = e(\substr($chop, 0, $m[0][1]));
$value = $chop = \substr($chop, $m[0][1]);
}
// <https://spec.commonmark.org/0.31.2#example-518>
if (!$is_img && \preg_match('/(?<!!)' . q('[]', true, $contains, $is_table ? '|' : "") . '/', $v = $m[0][0], $n, \PREG_OFFSET_CAPTURE) && $n[0][1] > 0) {
if (false !== \strpos($v, '](') || false !== \strpos($v, '][') || isset($lot[0][\trim(\strtolower($n[1][0]))])) {
$chops[] = e($v = \substr($v, 0, $n[0][1]));
$value = \substr($chop, \strlen($v));
continue;
}
}
$value = $chop = \substr($chop, \strlen($m[0][0]));
// `[^asdf]`
if (0 === \strpos($m[1][0], '^') && ("" === $chop || false === \strpos('([', $chop[0]))) {
if (!isset($lot[2][$key = \trim(\substr($m[1][0], 1))])) {
$chops[] = e($m[0][0]);
continue;
}
$notes[$key] = ($notes[$key] ?? 0) + 1;
$chops[] = ['sup', [['a', (string) \count($notes), [
'href' => '#to:' . $key,
'role' => 'doc-noteref'
], -1, [false, $m[0][0]]]], [
'id' => 'from:' . $key . ($notes[$key] > 1 ? '.' . $notes[$key] : "")
], -1, [$key, $m[0][0]]];
$lot['notes'] = $notes;
continue;
}
$row = row($m[1][0], $lot)[0];
// `…(asdf)`
if (0 === \strpos($chop, '(') && \preg_match('/' . r('()', true, q('<>'), $is_table ? '|' : "") . '/', $chop, $n, \PREG_OFFSET_CAPTURE)) {
if ($n[0][1] > 0) {
$chops[] = e($m[0][0] . \substr($chop, 0, $n[0][1]));
$value = \substr($chop, $n[0][1]);
continue;
}
$test = \trim($n[1][0]);
// `[asdf]()` or `[asdf](<>)`
if ("" === $test || '<>' === $test) {
$link = "";
// `[asdf](<asdf>)`
} else if ('<' === $test[0]) {
if (false !== ($v = \strstr(\substr($test, 1), '>', true))) {
$link = $v;
$title = \trim(\substr($test, \strlen($v) + 2));
$title = "" !== $title ? $title : null;
} else {
$link = $test;
}
// `[asdf](asdf …)`
} else if (\strpos($test, ' ') > 0 || \strpos($test, "\n") > 0) {
$link = \trim(\strtok($test, " \n"));
$title = \trim(\strpbrk($test, " \n"));
// `[asdf](asdf)`
} else {
$link = $test;
}
// <https://spec.commonmark.org/0.31.2#example-490>
// <https://spec.commonmark.org/0.31.2#example-493>
// <https://spec.commonmark.org/0.31.2#example-494>
if (false !== \strpos($link, "\n") || '\\' === \substr($link, -1) || 0 === \strpos($link, '<')) {
$chops[] = e(v(\strtr($m[0][0] . $n[0][0], "\n", ' ')));
$value = \substr($chop, \strlen($n[0][0]));
continue;
}
if (\is_string($title) && "" !== $title) {
// `[asdf](asdf "asdf")` or `[asdf](asdf 'asdf')` or `[asdf](asdf (asdf))`
$a = $title[0];
$b = \substr($title, -1);
if (('"' === $a && '"' === $b || "'" === $a && "'" === $b || '(' === $a && ')' === $b) && \preg_match('/^' . q($a . $b) . '$/', $title)) {
$title = v(d(\substr($title, 1, -1)));
// `[asdf](asdf asdf)`
// <https://spec.commonmark.org/0.31.2#example-488>
} else {
$chops[] = e(v(\strtr($m[0][0] . $n[0][0], "\n", ' ')));
$value = \substr($chop, \strlen($n[0][0]));
continue;
}
}
$key = false;
$value = $chop = \substr($chop, \strlen($n[0][0]));
// `…[]` or `…[asdf]`
} else if (0 === \strpos($chop, '[') && \preg_match('/' . r('[]', true, $contains, $is_table ? '|' : "") . '/', $chop, $n, \PREG_OFFSET_CAPTURE)) {
$value = $chop = \substr($chop, \strlen($n[0][0]));
if (!isset($lot[0][$key = \trim(\strtolower("" === $n[1][0] ? $m[1][0] : $n[1][0]))])) {
$chops[] = e($m[0][0] . $n[0][0]);
continue;
}
}
$key = $key ?? \trim(\strtolower($m[1][0]));
if (\is_string($key) && !isset($lot[0][$key])) {
$chops[] = e($m[0][0]);
continue;
}
// …{asdf}
if (0 === \strpos(\trim($chop), '{') && \preg_match('/^\s*(' . q('{}', false, q('"') . '|' . q("'"), $is_table ? '|' : "") . ')/', $chop, $o)) {
if ("" !== \trim(\substr($o[1], 1, -1))) {
$data = \array_replace($data ?? [], a($o[1], true));
$value = \substr($chop, \strlen($o[0]));
}
}
if (false !== $key) {
$data = \array_replace($lot[0][$key][2] ?? [], $data ?? []);
$link = $lot[0][$key][0] ?? null;
$title = $lot[0][$key][1] ?? null;
}
if (!l($link)) {
$data['rel'] = $data['rel'] ?? 'nofollow';
$data['target'] = $data['target'] ?? '_blank';
}
$chops[] = ['a', $row, \array_replace([
'href' => u(v($link)),
'title' => $title
], $data ?? []), -1, [$key, $m[0][0] . ($n[0][0] ?? "") . ($o[0] ?? "")]];
continue;
}
$chops[] = '[';
$value = \substr($chop, 1);
continue;
}
if ('_' === $c) {
$contains = '`[^`]+`|\\\\.|[' . ($is_table ? '^|' : '\s\S') . ']';
$last = $chops[\count($chops) - 1] ?? 0;
if ($last && \is_string($last) && \preg_match('/\b/', \substr($last, -1))) {
$chops[] = e(\substr($chop, 0, $n = \strspn($chop, $c)));
$value = \substr($chop, $n);
continue;
}
if (
// Prefer `<em><strong>…</strong></em>`
\preg_match('/^(_)((__)(?![_\s])(?>' . $contains . ')+?(?<![_\s])\3)\1/', $chop, $m) ||
\preg_match('/^(__)(?!\s)((?>' . $contains . ')+?)(?<!\s)\1\b/', $chop, $m) ||
\preg_match('/^(_)(?!\s)((?>' . $contains . ')+?)(?<!\s)\1\b/', $chop, $m)
) {
// <https://spec.commonmark.org/0.31.2#example-521>
if (false !== ($n = \strpos($m[0], '[')) && (false === \strpos($m[0], ']') || !\preg_match('/' . r('[]') . '/', $m[0]))) {
$chops[] = e(\substr($chop, 0, $n));
$value = \substr($chop, $n);
continue;
}
$chops[] = [1 === ($n = \strlen($m[1])) ? 'em' : 'strong', row($m[2], $lot)[0], [], -1, [$c, $n]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
$chops[] = e(\substr($chop, 0, $n = \strspn($chop, $c)));
$value = \substr($chop, $n);
continue;
}
if ('`' === $c) {
if (\preg_match('/^(`+)(?!`)(.+?)(?<!`)\1(?!`)/s', $chop, $m)) {
// <https://spec.commonmark.org/0.31.2#code-spans>
$raw = \strtr($m[2], "\n", ' ');
if ("" !== \trim($raw) && ' ' === $raw[0] && ' ' === \substr($raw, -1)) {
$raw = \substr($raw, 1, -1);
}
$chops[] = ['code', e($raw), [], -1, [$c, \strlen($m[1])]];
$value = \substr($chop, \strlen($m[0]));
continue;
}
$chops[] = \str_repeat($c, $n = \strspn($chop, $c));
$value = \substr($chop, $n);
continue;
}
if ($is_table && '|' === $c) {
$chops[] = [false, $c, [], -1];
$value = \substr($chop, 1);
continue;
}
if (\is_array($abbr = abbr($v = $chop, $lot))) {
$chops = \array_merge($chops, $abbr);
} else {
$chops[] = e($v);
}
$value = "";
}
if ("" !== $value) {
if (\is_array($abbr = abbr($v = $value, $lot))) {
$chops = \array_merge($chops, $abbr);
} else {
$chops[] = e($v);
}
}
return [m($chops), $lot];
}
function rows(?string $value, array &$lot = [], int $level = 0): array {
// List of reference(s), abbreviation(s), and note(s)
$lot = \array_replace([[], [], []], $lot);
if ("" === \trim($value ?? "")) {
return [[], $lot];
}
// Normalize line break(s)
$value = \trim(\strtr($value, [
"\r\n" => "\n",
"\r" => "\n"
]), "\n");
$block = -1;
$blocks = [];
$rows = \explode("\n", $value);
foreach ($rows as $row) {
// Normalize tab(s) to pad(s)
$row = \rtrim($row, "\t");
while (false !== ($pad = \strstr($row, "\t", true))) {
$row = $pad . \str_repeat(' ', 4 - ($v = \strlen($pad)) % 4) . \substr($row, $v + 1);
}
$of = of($row);
if ($last = $blocks[$block] ?? 0) {
// Last block is a code block
if ('pre' === $last[0]) {
if (2 === $last[4][0] || 3 === $last[4][0]) {
// End of the code block
if ('pre' === $of[0] && $last[4][0] === $of[4][0] && $last[4][1] === $of[4][1]) {
$fence = \rtrim(\strstr($of[1], "\n", true) ?: $of[1]);
// End of the code block cannot have an info string
if (\strlen($fence) !== $of[4][1]) {
$blocks[$block][1] .= "\n" . $of[1];
continue;
}
$blocks[$block++][1] .= "\n" . $of[1];
continue;
}
// Continue the code block…
$blocks[$block][1] .= "\n" . $row;
continue;
}
// End of the code block
if (null !== $of[0] && 'pre' !== $of[0]) {
if ("\n" === \substr($v = \rtrim($last[1], ' '), -1)) {
$blocks[$block][1] = \substr($v, 0, -1);
}
$blocks[++$block] = $of;
continue;
}
// Continue the code block…
$blocks[$block][1] .= "\n" . $of[1];
continue;
}
// Last block is a raw block
if (false === $last[0]) {
if (1 === $last[4][0]) {
if (false !== \strpos($last[1], '</' . $last[4][1] . '>')) {
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[++$block] = $of;
continue;
}
if (null !== $of[0] && false !== \strpos($of[1], '</' . $last[4][1] . '>')) {
$blocks[$block++][1] .= "\n" . $row;
continue;
}
$blocks[$block][1] .= "\n" . $row;
continue;
}
if (2 === $last[4][0]) {
if (false !== \strpos($last[1], '-->')) {
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[++$block] = $of;
continue;
}
if (null !== $of[0] && false !== \strpos($of[1], '-->')) {
$blocks[$block++][1] .= "\n" . $row;
continue;
}
$blocks[$block][1] .= "\n" . $row;
continue;
}
if (3 === $last[4][0]) {
if (false !== \strpos($last[1], '?' . '>')) {
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[++$block] = $of;
continue;
}
if (null !== $of[0] && false !== \strpos($of[1], '?' . '>')) {
$blocks[$block++][1] .= "\n" . $row;
continue;
}
$blocks[$block][1] .= "\n" . $row;
continue;
}
if (4 === $last[4][0]) {
if (false !== \strpos($last[1], '>')) {
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[++$block] = $of;
continue;
}
if (null !== $of[0] && false !== \strpos($of[1], '>')) {
$blocks[$block++][1] .= "\n" . $row;
continue;
}
$blocks[$block][1] .= "\n" . $row;
continue;
}
if (5 === $last[4][0]) {
if (false !== \strpos($last[1], ']]>')) {
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[++$block] = $of;
continue;
}
if (null !== $of[0] && false !== \strpos($of[1], ']]>')) {
$blocks[$block++][1] .= "\n" . $row;
continue;
}
$blocks[$block][1] .= "\n" . $row;
continue;
}
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[$block][1] .= "\n" . $row;
continue;
}
// Last block is an abbreviation, note, or reference
if (\is_int($last[0])) {
if (2 === $last[0]) {
// Must have at least 1 white-space after the `]:`
if (false !== ($n = \strpos($last[1], ']:')) && "\\" !== \substr($last[1], $n - 1, 1) && false === \strpos(" \n", \substr($last[1], $n + 2, 1))) {
$blocks[$block][0] = 'p';
if (null === $of[0]) {
$block += 1;
continue;
}
$blocks[$block][1] .= "\n" . $of[1];
continue;
}
// End of the note block
if (null !== $of[0] && $of[3] <= $last[3]) {
if ("\n" === \substr($v = \rtrim($last[1], ' '), -1)) {
$blocks[$block][1] = $v = \substr($v, 0, -1);
} else {
// Lazy note block?
if ('p' === $of[0]) {
$blocks[$block][1] .= "\n" . $of[1];
continue;
}
}
// Note block must not be empty
if (']:' === \substr($v, -2) && "\\" !== \substr($v, -3, 1)) {