kc3-lang/md4c

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5104e5..c874e2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,9 +14,16 @@ Changes:
    follows the table has to be delimited with a blank line.
 
  * With `MD_FLAG_LATEXMATHSPANS`, LaTeX math spans (`$...$`) and LaTeX display
-   math spans (`$$...$$`) are recognized. (Note though that the HTML renderer
-   outputs them verbatim.) Thanks for the feature belong to [Tilman Roeder](
-   https://github.com/dyedgreen).
+   math spans (`$$...$$`) are now recognized. (Note though that the HTML
+   renderer outputs them verbatim in a custom `<x-equation>` tag.)
+
+   Contributed by [Tilman Roeder](https://github.com/dyedgreen).
+
+ * With `MD_FLAG_WIKILINKS`, Wiki-style links (`[[...]]`) are now recognized.
+   (Note htough that the HTML renderer renders them as a custom `<x-wikilink>`
+   tag.)
+
+   Contributed by [Nils Blomqvist](https://github.com/niblo).
 
 Fixes:
 
diff --git a/md2html/md2html.c b/md2html/md2html.c
index a8e47a5..ce79943 100644
--- a/md2html/md2html.c
+++ b/md2html/md2html.c
@@ -209,6 +209,7 @@ static const option cmdline_options[] = {
     { "ftables",                     0,  'T', OPTION_ARG_NONE },
     { "fstrikethrough",              0,  'S', OPTION_ARG_NONE },
     { "flatex-math",                 0,  'L', OPTION_ARG_NONE },
+    { "fwiki-links",                 0,  'K', OPTION_ARG_NONE },
     { "ftasklists",                  0,  'X', OPTION_ARG_NONE },
     { 0 }
 };
@@ -258,6 +259,7 @@ usage(void)
         "      --ftables        Enable tables\n"
         "      --fstrikethrough Enable strikethrough spans\n"
         "      --flatex-math    Enable LaTeX style mathematics spans (e.g. $a+b=c$ becomes <equation>a+b=c</equation>)\n"
+        "      --fwiki-links    Enable wiki links\n"
         "      --ftasklists     Enable task lists\n"
     );
 }
@@ -307,6 +309,7 @@ cmdline_callback(int opt, char const* value, void* data)
         case 'T':   parser_flags |= MD_FLAG_TABLES; break;
         case 'S':   parser_flags |= MD_FLAG_STRIKETHROUGH; break;
         case 'L':   parser_flags |= MD_FLAG_LATEXMATHSPANS; break;
+        case 'K':   parser_flags |= MD_FLAG_WIKILINKS; break;
         case 'X':   parser_flags |= MD_FLAG_TASKLISTS; break;
 
         default:
diff --git a/md2html/render_html.c b/md2html/render_html.c
index 7f7e780..fcfb100 100644
--- a/md2html/render_html.c
+++ b/md2html/render_html.c
@@ -353,6 +353,15 @@ render_close_img_span(MD_RENDER_HTML* r, const MD_SPAN_IMG_DETAIL* det)
     r->image_nesting_level--;
 }
 
+static void
+render_open_wikilink_span(MD_RENDER_HTML* r, const MD_SPAN_WIKILINK_DETAIL* det)
+{
+    RENDER_LITERAL(r, "<x-wikilink data-target=\"");
+    render_attribute(r, &det->target, render_html_escaped);
+
+    RENDER_LITERAL(r, "\">");
+}
+
 
 /**************************************
  ***  HTML renderer implementation  ***
@@ -434,6 +443,7 @@ enter_span_callback(MD_SPANTYPE type, void* detail, void* userdata)
         case MD_SPAN_DEL:               RENDER_LITERAL(r, "<del>"); break;
         case MD_SPAN_LATEXMATH:         RENDER_LITERAL(r, "<x-equation>"); break;
         case MD_SPAN_LATEXMATH_DISPLAY: RENDER_LITERAL(r, "<x-equation type=\"display\">"); break;
+        case MD_SPAN_WIKILINK:          render_open_wikilink_span(r, (MD_SPAN_WIKILINK_DETAIL*) detail); break;
     }
 
     return 0;
@@ -461,6 +471,7 @@ leave_span_callback(MD_SPANTYPE type, void* detail, void* userdata)
         case MD_SPAN_DEL:               RENDER_LITERAL(r, "</del>"); break;
         case MD_SPAN_LATEXMATH:         /*fall through*/
         case MD_SPAN_LATEXMATH_DISPLAY: RENDER_LITERAL(r, "</x-equation>"); break;
+        case MD_SPAN_WIKILINK:          RENDER_LITERAL(r, "</x-wikilink>"); break;
     }
 
     return 0;
diff --git a/md4c/md4c.c b/md4c/md4c.c
index ecd9656..27164b9 100644
--- a/md4c/md4c.c
+++ b/md4c/md4c.c
@@ -204,12 +204,14 @@ struct MD_LINE_ANALYSIS_tag {
     OFF beg;
     OFF end;
     unsigned indent;        /* Indentation level. */
+    unsigned total_indent;  /* Total indent in characters. */
 };
 
 typedef struct MD_LINE_tag MD_LINE;
 struct MD_LINE_tag {
     OFF beg;
     OFF end;
+    unsigned total_indent;  /* Total indent in characters. */
 };
 
 typedef struct MD_VERBATIMLINE_tag MD_VERBATIMLINE;
@@ -2696,7 +2698,7 @@ md_build_mark_char_map(MD_CTX* ctx)
     if(ctx->parser.flags & MD_FLAG_PERMISSIVEWWWAUTOLINKS)
         ctx->mark_char_map['.'] = 1;
 
-    if(ctx->parser.flags & MD_FLAG_TABLES)
+    if((ctx->parser.flags & MD_FLAG_TABLES) || (ctx->parser.flags & MD_FLAG_WIKILINKS))
         ctx->mark_char_map['|'] = 1;
 
     if(ctx->parser.flags & MD_FLAG_COLLAPSEWHITESPACE) {
@@ -3236,8 +3238,8 @@ md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
                 continue;
             }
 
-            /* A potential table cell boundary. */
-            if(table_mode  &&  ch == _T('|')) {
+            /* A potential table cell boundary or wiki link label delimiter. */
+            if((table_mode || ctx->parser.flags & MD_FLAG_WIKILINKS) && ch == _T('|')) {
                 PUSH_MARK(ch, off, off+1, 0);
                 off++;
                 continue;
@@ -3398,6 +3400,92 @@ md_resolve_links(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
             continue;
         }
 
+        /* Detect and resolve wiki links. */
+        if ((ctx->parser.flags & MD_FLAG_WIKILINKS) &&
+            next_opener != NULL && next_closer != NULL &&
+            (opener->end - opener->beg == 1) &&
+            (next_opener->beg == opener->beg - 1) &&
+            (next_closer->beg == closer->beg + 1) &&
+            (next_opener->end - next_opener->beg == 1) &&
+            (next_closer->end - next_closer->beg == 1) &&
+            (next_opener->ch == '[' && next_closer->ch == ']'))
+        {
+            is_link = TRUE;
+
+            if (opener->end == closer->beg)
+                is_link = FALSE;
+
+            int delim_index = opener_index;
+            MD_MARK* delim = &ctx->marks[delim_index];
+
+            /* To prevent runaway O(n^2) performance, don't look too far for the delimiter (.. < 100). */
+            while(is_link && delim_index < closer_index && (delim_index - opener_index) < 100 ) {
+                if(delim->ch == '|' && delim->beg == opener->end) {
+                    is_link = FALSE;
+                } else if(delim->ch == '|' && delim->end == closer->beg) {
+                    break;
+                } else if(delim->ch == '|') {
+                    opener->end = delim->beg;
+                    break;
+                }
+                delim_index++;
+                delim = &ctx->marks[delim_index];
+            }
+
+            OFF off = closer->beg-1;
+            int count = 0;
+            int has_label = (opener->end - opener->beg > 2);
+            const MD_LINE* line;
+            int line_index = n_lines-1;
+
+            /* An image inside the link target disables the wiki link. */
+            if( (has_label && last_img_beg >= opener->beg && last_img_end <= opener->end) ||
+                (!has_label && last_img_beg >= opener->beg && last_img_end <= closer->end))
+                is_link = FALSE;
+
+            while(is_link && off > opener->beg && count++ < 100) {
+
+                /* Newline not allowed in link target. */
+                if(has_label && (off <= opener->end) && ISNEWLINE(off))
+                    is_link = FALSE;
+                else if(!has_label && off > opener->end && ISNEWLINE(off))
+                    is_link = FALSE;
+                else if(ISNEWLINE(off)) {
+                    line = &lines[line_index--];
+                    count = count - line->total_indent - 1;  /* Count newline too. */
+                }
+
+                off--;
+            }
+
+            if(off > opener->beg)
+                is_link = FALSE;
+
+            if(is_link) {
+                if(delim->ch == '|')
+                    delim->flags |= MD_MARK_RESOLVED;
+
+                opener->beg = next_opener->beg;
+                closer->end = next_closer->end;
+
+                opener->next = closer_index;
+                opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED;
+                closer->prev = opener_index;
+                closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED;
+
+                last_link_beg = opener->beg;
+                last_link_end = closer->end;
+
+                if ((opener->end - opener->beg > 2))
+                    md_analyze_link_contents(ctx, lines, n_lines, opener_index+1, closer_index);
+
+                opener_index = next_index;
+                continue;
+            }
+
+        }
+
+
         if(next_opener != NULL  &&  next_opener->beg == closer->end) {
             if(next_closer->beg > closer->end + 1) {
                 /* Might be full reference link. */
@@ -3860,8 +3948,16 @@ md_analyze_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mod
     /* (1) Entities; code spans; autolinks; raw HTML. */
     md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("&"));
 
+    /* (2) Links. */
+    md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("[]!"));
+    MD_CHECK(md_resolve_links(ctx, lines, n_lines));
+    BRACKET_OPENERS.head = -1;
+    BRACKET_OPENERS.tail = -1;
+    ctx->unresolved_link_head = -1;
+    ctx->unresolved_link_tail = -1;
+
     if(table_mode) {
-        /* (2) Analyze table cell boundaries.
+        /* (3) Analyze table cell boundaries.
          * Note we reset TABLECELLBOUNDARIES chain prior to the call md_analyze_marks(),
          * not after, because caller may need it. */
         MD_ASSERT(n_lines == 1);
@@ -3872,14 +3968,6 @@ md_analyze_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mod
         return ret;
     }
 
-    /* (3) Links. */
-    md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("[]!"));
-    MD_CHECK(md_resolve_links(ctx, lines, n_lines));
-    BRACKET_OPENERS.head = -1;
-    BRACKET_OPENERS.tail = -1;
-    ctx->unresolved_link_head = -1;
-    ctx->unresolved_link_tail = -1;
-
     /* (4) Emphasis and strong emphasis; permissive autolinks. */
     md_analyze_link_contents(ctx, lines, n_lines, 0, ctx->n_marks);
 
@@ -3941,6 +4029,27 @@ abort:
     return ret;
 }
 
+static int
+md_enter_leave_span_wikilink(MD_CTX* ctx, int enter, const CHAR* target, SZ target_size)
+{
+    MD_ATTRIBUTE_BUILD target_build = { 0 };
+    MD_SPAN_WIKILINK_DETAIL det;
+    int ret = 0;
+
+    memset(&det, 0, sizeof(MD_SPAN_WIKILINK_DETAIL));
+    MD_CHECK(md_build_attribute(ctx, target, target_size, 0, &det.target, &target_build));
+
+    if (enter)
+        MD_ENTER_SPAN(MD_SPAN_WIKILINK, &det);
+    else
+        MD_LEAVE_SPAN(MD_SPAN_WIKILINK, &det);
+
+abort:
+    md_free_attribute(ctx, &target_build);
+    return ret;
+}
+
+
 /* Render the output, accordingly to the analyzed ctx->marks. */
 static int
 md_process_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
@@ -4036,11 +4145,35 @@ md_process_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
                     }
                     break;
 
-                case '[':       /* Link, image. */
+                case '[':       /* Link, wiki link, image. */
                 case '!':
                 case ']':
                 {
                     const MD_MARK* opener = (mark->ch != ']' ? mark : &ctx->marks[mark->prev]);
+                    const MD_MARK* closer = &ctx->marks[opener->next];
+
+                    if ((opener->ch == '[' && closer->ch == ']') &&
+                        opener->end - opener->beg >= 2 &&
+                        closer->end - closer->beg == 2)
+                    {
+                        const MD_MARK* delim = opener+3;  /* Scan past the two dummy marks. */
+                        int has_label = (opener->end - opener->beg > 2);
+                        int target_sz;
+
+                        if(has_label)
+                            target_sz = opener->end - (opener->beg+2);
+                        else if(delim->ch == '|')
+                            target_sz = (closer->beg-1) - opener->end;
+                        else
+                            target_sz = closer->beg - opener->end;
+
+                        MD_CHECK(md_enter_leave_span_wikilink(ctx, (mark->ch != ']'),
+                                 has_label ? STR(opener->beg+2) : STR(opener->end),
+                                 target_sz));
+
+                        break;
+                    }
+
                     const MD_MARK* dest_mark = opener+1;
                     const MD_MARK* title_mark = opener+2;
 
@@ -4862,6 +4995,7 @@ md_add_line_into_current_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* analysis)
 
         line->beg = analysis->beg;
         line->end = analysis->end;
+        line->total_indent = analysis->total_indent;
     }
     ctx->current_block->n_lines++;
 
@@ -5529,6 +5663,7 @@ md_analyze_line(MD_CTX* ctx, OFF beg, OFF* p_end,
                 line->indent--;
 
             line->beg = off;
+
         } else if(c->ch != _T('>')  &&  line->indent >= c->contents_indent) {
             /* List. */
             line->indent -= c->contents_indent;
@@ -5865,6 +6000,8 @@ md_analyze_line(MD_CTX* ctx, OFF beg, OFF* p_end,
         break;
     }
 
+    line->total_indent = total_indent;
+
     /* Scan for end of the line.
      *
      * Note this is quite a bottleneck of the parsing as we here iterate almost
diff --git a/md4c/md4c.h b/md4c/md4c.h
index 6d9fce5..0f8e806 100644
--- a/md4c/md4c.h
+++ b/md4c/md4c.h
@@ -135,7 +135,12 @@ typedef enum MD_SPANTYPE {
      * Note: Recognized only when MD_FLAG_LATEXMATHSPANS is enabled.
      */
     MD_SPAN_LATEXMATH,
-    MD_SPAN_LATEXMATH_DISPLAY
+    MD_SPAN_LATEXMATH_DISPLAY,
+
+    /* Wiki links
+     * Note: Recognized only when MD_FLAG_WIKILINKS is enabled.
+     */
+    MD_SPAN_WIKILINK
 } MD_SPANTYPE;
 
 /* Text is the actual textual contents of span. */
@@ -268,6 +273,10 @@ typedef struct MD_SPAN_IMG_DETAIL {
     MD_ATTRIBUTE title;
 } MD_SPAN_IMG_DETAIL;
 
+/* Detailed info for MD_SPAN_WIKILINK. */
+typedef struct MD_SPAN_WIKILINK {
+    MD_ATTRIBUTE target;
+} MD_SPAN_WIKILINK_DETAIL;
 
 /* Flags specifying extensions/deviations from CommonMark specification.
  *
@@ -286,6 +295,7 @@ typedef struct MD_SPAN_IMG_DETAIL {
 #define MD_FLAG_PERMISSIVEWWWAUTOLINKS      0x0400  /* Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */
 #define MD_FLAG_TASKLISTS                   0x0800  /* Enable task list extension. */
 #define MD_FLAG_LATEXMATHSPANS              0x1000  /* Enable $ and $$ containing LaTeX equations. */
+#define MD_FLAG_WIKILINKS                   0x2000  /* Enable wiki links extension. */
 
 #define MD_FLAG_PERMISSIVEAUTOLINKS         (MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEWWWAUTOLINKS)
 #define MD_FLAG_NOHTML                      (MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS)
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index 88394f8..7e6fe73 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -63,5 +63,9 @@ echo "LaTeX extension:"
 $PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/latex-math.txt" -p "$PROGRAM --flatex-math"
 
 echo
+echo "Wiki links extension:"
+$PYTHON "$TEST_DIR/spec_tests.py" -s "$TEST_DIR/wiki-links.txt" -p "$PROGRAM --fwiki-links --ftables"
+
+echo
 echo "Pathological input:"
 $PYTHON "$TEST_DIR/pathological_tests.py" -p "$PROGRAM"
diff --git a/test/wiki-links.txt b/test/wiki-links.txt
new file mode 100644
index 0000000..3210354
--- /dev/null
+++ b/test/wiki-links.txt
@@ -0,0 +1,254 @@
+
+# Wiki Links
+
+With the flag `MD_FLAG_WIKILINKS`, MD4C recognizes wiki links.
+
+A wiki link is ...
+
+```````````````````````````````` example
+[[foo]]
+.
+<p><x-wikilink data-target="foo">foo</x-wikilink></p>
+````````````````````````````````
+
+A wiki link cannot be empty.
+
+```````````````````````````````` example
+[[]]
+.
+<p>[[]]</p>
+````````````````````````````````
+
+The link target of a wiki link cannot span more than one line:
+
+```````````````````````````````` example
+[[foo
+bar]]
+.
+<p>[[foo
+bar]]</p>
+````````````````````````````````
+
+The link target is rendered verbatim; inline markup is not recognized.
+
+```````````````````````````````` example
+[[*foo*]]
+.
+<p><x-wikilink data-target="*foo*">*foo*</x-wikilink></p>
+````````````````````````````````
+
+Wiki links can have a label that is delimited by a `|`.
+
+```````````````````````````````` example
+[[foo|bar]]
+.
+<p><x-wikilink data-target="foo">bar</x-wikilink></p>
+````````````````````````````````
+
+A wiki link with a label but without an id is not a wiki link.
+
+```````````````````````````````` example
+[[|foo]]
+.
+<p>[[|foo]]</p>
+````````````````````````````````
+
+With multiple `|` delimiters, only the first is recognized.
+
+```````````````````````````````` example
+[[foo|bar|baz]]
+.
+<p><x-wikilink data-target="foo">bar|baz</x-wikilink></p>
+````````````````````````````````
+
+The delimiter `|` can be escaped with `/`.
+
+```````````````````````````````` example
+[[foo\|bar|baz]]
+.
+<p><x-wikilink data-target="foo|bar">baz</x-wikilink></p>
+````````````````````````````````
+
+The label can contain inline elements.
+
+```````````````````````````````` example
+[[foo|*bar*]]
+.
+<p><x-wikilink data-target="foo"><em>bar</em></x-wikilink></p>
+````````````````````````````````
+
+The label can contain at most one linebreak.
+
+```````````````````````````````` example
+[[foo|*bar
+baz*]]
+.
+<p><x-wikilink data-target="foo"><em>bar
+baz</em></x-wikilink></p>
+````````````````````````````````
+
+A wiki link with an empty label is considered invalid.
+
+```````````````````````````````` example
+[[foo|]]
+.
+<p><x-wikilink data-target="foo">foo</x-wikilink></p>
+````````````````````````````````
+
+The label can span multiple lines.
+
+```````````````````````````````` example
+[[foo|foo
+bar
+baz]]
+.
+<p><x-wikilink data-target="foo">foo
+bar
+baz</x-wikilink></p>
+````````````````````````````````
+
+Wiki links are prioritized over regular links.
+
+```````````````````````````````` example
+[[foo]](foo.jpg)
+.
+<p><x-wikilink data-target="foo">foo</x-wikilink>(foo.jpg)</p>
+````````````````````````````````
+
+Wiki links can be inlined in tables.
+
+```````````````````````````````` example
+| A                | B   |
+|------------------|-----|
+| [[foo|*bar*]]    | baz |
+.
+<table>
+<thead>
+<tr>
+<th>A</th>
+<th>B</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td><x-wikilink data-target="foo"><em>bar</em></x-wikilink></td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+````````````````````````````````
+
+Wiki links not prioritzed over images.
+
+```````````````````````````````` example
+![[foo]](foo.jpg)
+.
+<p><img src="foo.jpg" alt="[foo]"></p>
+````````````````````````````````
+
+An image placed inside a wiki link target disables the wiki link.
+
+```````````````````````````````` example
+[[![foo](foo.jpg)]]
+.
+<p>[[<img src="foo.jpg" alt="foo">]]</p>
+
+````````````````````````````````
+
+```````````````````````````````` example
+[[![foo](foo.jpg)|test]]
+.
+<p>[[<img src="foo.jpg" alt="foo">|test]]</p>
+````````````````````````````````
+
+But images can be placed in the wiki link label.
+
+```````````````````````````````` example
+[[foo|![bar](bar.jpg)]]
+.
+<p><x-wikilink data-target="foo"><img src="bar.jpg" alt="bar"></x-wikilink></p>
+````````````````````````````````
+
+Something that may look like a wiki link at first, but turns out not to be,
+is recognized as a normal link.
+
+```````````````````````````````` example
+[[foo]
+
+[foo]: /url
+.
+<p>[<a href="/url">foo</a></p>
+````````````````````````````````
+
+Escaping the opening `[`, we should get a normal link.
+
+```````````````````````````````` example
+\[[foo]]
+
+[foo]: /url
+.
+<p>[<a href="/url">foo</a>]</p>
+````````````````````````````````
+
+Like normal links, the innermost wiki link is preferred.
+
+```````````````````````````````` example
+[[foo[[bar]]]]
+.
+<p>[[foo<x-wikilink data-target="bar">bar</x-wikilink>]]</p>
+````````````````````````````````
+
+
+There is limit of 100 characters inside a wiki link target (or id); 101
+characters is too much.
+
+```````````````````````````````` example
+[[12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901]]
+.
+<p>[[12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901]]</p>
+````````````````````````````````
+
+100 characters inside a wiki link target works.
+
+```````````````````````````````` example
+[[1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890]]
+.
+<p><x-wikilink data-target="1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890">1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890</x-wikilink></p>
+````````````````````````````````
+
+If a label is included, the limit is 99 characters in total, excluding the `|`
+delimiter.
+
+```````````````````````````````` example
+[[12345678901234567890123456789012345678901234567890|1234567890123456789012345678901234567890123456789]]
+.
+<p><x-wikilink data-target="12345678901234567890123456789012345678901234567890">1234567890123456789012345678901234567890123456789</x-wikilink></p>
+````````````````````````````````
+
+This example shows that 101 characters (or 100 exclusive the delimiter) is one
+too many.
+
+```````````````````````````````` example
+[[12345678901234567890123456789012345678901234567890|12345678901234567890123456789012345678901234567890]]
+.
+<p>[[12345678901234567890123456789012345678901234567890|12345678901234567890123456789012345678901234567890]]</p>
+````````````````````````````````
+
+The limit on link content does not include any characters belonging to a block
+quote, if the label spans multiple lines contained in a block quote.
+
+```````````````````````````````` example
+> [[12345678901234567890123456789012345678901234567890|1234567890
+> 1234567890
+> 1234567890
+> 1234567890
+> 123456789]]
+.
+<blockquote>
+<p><x-wikilink data-target="12345678901234567890123456789012345678901234567890">1234567890
+1234567890
+1234567890
+1234567890
+123456789</x-wikilink></p>
+</blockquote>
+````````````````````````````````