'; } $split = self::split_front_matter( $text ); $header = $split['header']; $body = $split['body']; $parts = array(); if ( '' !== $header ) { foreach ( preg_split( '/\r?\n/', $header ) ?: array() as $line ) { $line = trim( $line ); if ( '' === $line ) { continue; } $parts[] = '

' . esc_html( $line ) . '

'; } $parts[] = '

'; } $parts[] = self::convert_body( '' !== $body ? $body : ( '' === $header ? $text : '' ) ); return '' . implode( "\n", array_filter( $parts ) ) . ''; } /** * @return array{header: string, body: string} */ private static function split_front_matter( string $text ): array { $pattern = Template_Separator::multiline_split_pattern(); $parts = preg_split( $pattern, $text, 2 ); if ( is_array( $parts ) && isset( $parts[1] ) ) { return array( 'header' => trim( (string) $parts[0] ), 'body' => trim( (string) $parts[1] ), ); } return array( 'header' => '', 'body' => $text, ); } /** * @param string $body Markdown body. */ private static function convert_body( string $body ): string { $body = trim( $body ); if ( '' === $body ) { return ''; } $lines = preg_split( '/\r?\n/', $body ) ?: array(); $html = array(); $para = array(); $list = null; $in_code = false; $code = array(); $quote = array(); $i = 0; $count = count( $lines ); $flush_para = static function () use ( &$para, &$html ): void { if ( empty( $para ) ) { return; } $html[] = '

' . self::inline( implode( ' ', $para ) ) . '

'; $para = array(); }; $flush_list = static function () use ( &$list, &$html ): void { if ( ! is_array( $list ) ) { return; } $tag = $list['tag']; $html[] = '<' . $tag . '>' . implode( '', $list['items'] ) . ''; $list = null; }; $flush_quote = static function () use ( &$quote, &$html ): void { if ( empty( $quote ) ) { return; } $html[] = '

' . self::inline( implode( ' ', $quote ) ) . '

'; $quote = array(); }; while ( $i < $count ) { $line = $lines[ $i ]; if ( $in_code ) { if ( preg_match( '/^```/', $line ) ) { $html[] = '

' . esc_html( implode( "\n", $code ) ) . '

'; $in_code = false; $code = array(); ++$i; continue; } $code[] = $line; ++$i; continue; } if ( preg_match( '/^```/', $line ) ) { $flush_para(); $flush_list(); $flush_quote(); $in_code = true; $code = array(); ++$i; continue; } $trim = rtrim( $line ); // GFM pipe tables (must run before generic paragraph / hr handling). if ( self::is_table_row_line( $trim ) ) { $flush_para(); $flush_list(); $flush_quote(); $table_lines = array( $trim ); ++$i; while ( $i < $count && self::is_table_row_line( rtrim( $lines[ $i ] ) ) ) { $table_lines[] = rtrim( $lines[ $i ] ); ++$i; } $built = self::build_table_html( $table_lines ); if ( '' !== $built ) { $html[] = $built; } else { foreach ( $table_lines as $table_line ) { $html[] = '

' . self::inline( $table_line ) . '

'; } } continue; } if ( Template_Separator::is_mark_line( $trim ) || preg_match( '/^(\*\s*){3,}$|^(-\s*){3,}$|^(_\s*){3,}$/', $trim ) ) { $flush_para(); $flush_list(); $flush_quote(); $html[] = '

'; ++$i; continue; } if ( preg_match( '/^(#{1,6})\s+(.+)$/', $trim, $m ) ) { $flush_para(); $flush_list(); $flush_quote(); $level = strlen( $m[1] ); $html[] = '' . self::inline( $m[2] ) . ''; ++$i; continue; } if ( preg_match( '/^>\s?(.*)$/', $trim, $m ) ) { $flush_para(); $flush_list(); $quote[] = $m[1]; ++$i; continue; } $flush_quote(); if ( preg_match( '/^\s*[-*+]\s+(.+)$/', $trim, $m ) ) { $flush_para(); if ( ! is_array( $list ) || 'ul' !== $list['tag'] ) { $flush_list(); $list = array( 'tag' => 'ul', 'items' => array(), ); } $list['items'][] = '

' . self::inline( $m[1] ) . '

'; ++$i; continue; } if ( preg_match( '/^\s*\d+\.\s+(.+)$/', $trim, $m ) ) { $flush_para(); if ( ! is_array( $list ) || 'ol' !== $list['tag'] ) { $flush_list(); $list = array( 'tag' => 'ol', 'items' => array(), ); } $list['items'][] = '

' . self::inline( $m[1] ) . '

'; ++$i; continue; } if ( '' === trim( $trim ) ) { $flush_para(); $flush_list(); ++$i; continue; } $flush_list(); $para[] = $trim; ++$i; } if ( $in_code ) { $html[] = '

' . esc_html( implode( "\n", $code ) ) . '

'; } $flush_quote(); $flush_para(); $flush_list(); return implode( "\n", $html ); } /** * Whether a line looks like a Markdown pipe-table row. */ private static function is_table_row_line( string $line ): bool { $line = trim( $line ); if ( '' === $line ) { return false; } if ( self::is_table_separator_line( $line ) ) { return true; } // Require pipe-bounded rows — avoid treating prose with a lone "|" as a table. return (bool) preg_match( '/^\|.+\|\s*$/', $line ); } /** * GFM table separator: | --- | :---: | ---: | */ private static function is_table_separator_line( string $line ): bool { $line = trim( $line ); return (bool) preg_match( '/^\|?\s*:?-+:?\s*(\|\s*:?-+:?\s*)+\|?\s*$/', $line ); } /** * @param array $lines Consecutive table lines. */ private static function build_table_html( array $lines ): string { $rows = array(); foreach ( $lines as $line ) { $line = trim( $line ); if ( self::is_table_separator_line( $line ) ) { $rows[] = array( 'type' => 'sep', 'cells' => array(), ); continue; } $cells = self::split_table_cells( $line ); if ( empty( $cells ) ) { continue; } $rows[] = array( 'type' => 'row', 'cells' => $cells, ); } if ( count( $rows ) < 2 ) { return ''; } $header = null; $body = array(); $saw_sep = false; foreach ( $rows as $row ) { if ( 'sep' === $row['type'] ) { $saw_sep = true; continue; } if ( ! $saw_sep && null === $header ) { $header = $row['cells']; continue; } $body[] = $row['cells']; } if ( null === $header ) { return ''; } if ( ! $saw_sep && empty( $body ) ) { // Single header-looking row without separator — not a table. return ''; } $html = ''; foreach ( $header as $cell ) { $html .= ''; } $html .= ''; if ( ! empty( $body ) ) { $html .= ''; foreach ( $body as $cells ) { $html .= ''; foreach ( $cells as $cell ) { $html .= ''; } $html .= ''; } $html .= ''; } $html .= '

' . self::inline( $cell ) . '
' . self::inline( $cell ) . '

'; return $html; } /** * @return array */ private static function split_table_cells( string $line ): array { $line = trim( $line ); if ( '' !== $line && '|' === $line[0] ) { $line = substr( $line, 1 ); } if ( '' !== $line && '|' === substr( $line, -1 ) ) { $line = substr( $line, 0, -1 ); } $parts = explode( '|', $line ); $cells = array(); foreach ( $parts as $part ) { $cells[] = trim( $part ); } return $cells; } /** * Inline Markdown (code, images, links, bold, italic). * * @param string $text Line or paragraph. */ private static function inline( string $text ): string { $text = trim( $text ); if ( '' === $text ) { return ''; } $pattern = '/(`[^`]+`|!\[[^\]]*\]$[^)]+$|\[[^\]]+\]$[^)]+$|\*\*[^*]+\*\*|__[^_]+__|\*[^*\s][^*]*\*|_[^_\s][^_]*_)/u'; $parts = preg_split( $pattern, $text, -1, PREG_SPLIT_DELIM_CAPTURE ); if ( ! is_array( $parts ) ) { return esc_html( $text ); } $out = ''; foreach ( $parts as $part ) { if ( '' === $part ) { continue; } if ( preg_match( '/^`([^`]+)`$/u', $part, $m ) ) { $out .= '' . esc_html( $m[1] ) . ''; continue; } if ( preg_match( '/^!\[([^\]]*)\]$([^)]+)$$/u', $part, $m ) ) { $src = trim( $m[2] ); $src = (string) preg_replace( '/\s+".*"$/', '', $src ); if ( self::is_local_image_src( $src ) ) { $out .= '[image:' . basename( $src ) . ']'; continue; } $out .= ' ' . esc_attr( $m[1] ) . '

'; continue; } if ( preg_match( '/^\[([^\]]+)\]$([^)]+)$$/u', $part, $m ) ) { $out .= '' . esc_html( $m[1] ) . ''; continue; } if ( preg_match( '/^\*\*([^*]+)\*\*$|^__([^_]+)__$/u', $part, $m ) ) { $out .= '' . esc_html( $m[1] !== '' ? $m[1] : ( $m[2] ?? '' ) ) . ''; continue; } if ( preg_match( '/^\*([^*]+)\*$|^_([^_]+)_$/u', $part, $m ) ) { $out .= '' . esc_html( $m[1] !== '' ? $m[1] : ( $m[2] ?? '' ) ) . ''; continue; } $out .= esc_html( $part ); } return $out; } /** * @param string $markdown Raw markdown. */ private static function normalize( string $markdown ): string { $markdown = preg_replace( '/^\xEF\xBB\xBF/', '', $markdown ); $markdown = str_replace( "\r\n", "\n", (string) $markdown ); $markdown = str_replace( "\r", "\n", $markdown ); return trim( $markdown ); } /** * Package-relative image paths become [image:] markers for Core Image import. */ private static function is_local_image_src( string $src ): bool { $src = trim( $src ); if ( '' === $src || preg_match( '#^[a-z][a-z0-9+.-]*:#i', $src ) ) { return false; } $ext = strtolower( (string) pathinfo( $src, PATHINFO_EXTENSION ) ); return in_array( $ext, array( 'png', 'jpg', 'jpeg', 'gif', 'webp', 'avif' ), true ); } }