import PR mity/md4c#284

Author: blackav

lib/markdown.c

@@ -18,6 +18,7 @@
 #include "ejudge/xalloc.h"
 
 #include "md4c/md4c-html.h"
+#include "md4c/src/md4c-html.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -62,7 +63,7 @@ markdown_parse(
     fhtml = open_memstream(&bhtml, &zhtml);
     if (!fhtml) goto done;
     unsigned parser_flags = MD_FLAG_LATEXMATHSPANS;
-    unsigned renderer_flags = MD_HTML_FLAG_SKIP_UTF8_BOM;
+    unsigned renderer_flags = MD_HTML_FLAG_SKIP_UTF8_BOM | MD_HTML_FLAG_MATHJAX;
     if (md_html(bmem, zmem, output_func, fhtml, parser_flags, renderer_flags) < 0) {
         goto done;
     }

md4c/src/md4c-html.c

@@ -460,8 +460,18 @@ enter_span_callback(MD_SPANTYPE type, void* detail, void* userdata)
         case MD_SPAN_IMG:               render_open_img_span(r, (MD_SPAN_IMG_DETAIL*) detail); break;
         case MD_SPAN_CODE:              RENDER_VERBATIM(r, "<code>"); break;
         case MD_SPAN_DEL:               RENDER_VERBATIM(r, "<del>"); break;
-        case MD_SPAN_LATEXMATH:         RENDER_VERBATIM(r, "<x-equation>"); break;
-        case MD_SPAN_LATEXMATH_DISPLAY: RENDER_VERBATIM(r, "<x-equation type=\"display\">"); break;
+        case MD_SPAN_LATEXMATH:
+            if (r->flags & MD_HTML_FLAG_MATHJAX) {
+                if (r->flags & MD_HTML_FLAG_MATHJAX_USE_DOLLAR) RENDER_VERBATIM(r, "$");
+                else RENDER_VERBATIM(r, "\\(");
+            } else RENDER_VERBATIM(r, "<x-equation>");
+            break;
+        case MD_SPAN_LATEXMATH_DISPLAY:
+            if (r->flags & MD_HTML_FLAG_MATHJAX) {
+                if (r->flags & MD_HTML_FLAG_MATHJAX_USE_DOLLAR) RENDER_VERBATIM(r, "$$");
+                else RENDER_VERBATIM(r, "\\[");
+            } else RENDER_VERBATIM(r, "<x-equation type=\"display\">");
+            break;
         case MD_SPAN_WIKILINK:          render_open_wikilink_span(r, (MD_SPAN_WIKILINK_DETAIL*) detail); break;
     }
 
@@ -486,8 +496,18 @@ leave_span_callback(MD_SPANTYPE type, void* detail, void* userdata)
         case MD_SPAN_IMG:               render_close_img_span(r, (MD_SPAN_IMG_DETAIL*) detail); break;
         case MD_SPAN_CODE:              RENDER_VERBATIM(r, "</code>"); break;
         case MD_SPAN_DEL:               RENDER_VERBATIM(r, "</del>"); break;
-        case MD_SPAN_LATEXMATH:         /*fall through*/
-        case MD_SPAN_LATEXMATH_DISPLAY: RENDER_VERBATIM(r, "</x-equation>"); break;
+        case MD_SPAN_LATEXMATH:
+            if (r->flags & MD_HTML_FLAG_MATHJAX) {
+                if (r->flags & MD_HTML_FLAG_MATHJAX_USE_DOLLAR) RENDER_VERBATIM(r, "$");
+                else RENDER_VERBATIM(r, "\\)");
+            } else RENDER_VERBATIM(r, "</x-equation>");
+            break;
+        case MD_SPAN_LATEXMATH_DISPLAY:
+            if (r->flags & MD_HTML_FLAG_MATHJAX) {
+                if (r->flags & MD_HTML_FLAG_MATHJAX_USE_DOLLAR) RENDER_VERBATIM(r, "$$");
+                else RENDER_VERBATIM(r, "\\]");
+            } else RENDER_VERBATIM(r, "</x-equation>");
+            break;
         case MD_SPAN_WIKILINK:          RENDER_VERBATIM(r, "</x-wikilink>"); break;
     }
 

md4c/src/md4c-html.h

@@ -38,6 +38,8 @@
 #define MD_HTML_FLAG_VERBATIM_ENTITIES      0x0002
 #define MD_HTML_FLAG_SKIP_UTF8_BOM          0x0004
 #define MD_HTML_FLAG_XHTML                  0x0008
+#define MD_HTML_FLAG_MATHJAX                0x1000
+#define MD_HTML_FLAG_MATHJAX_USE_DOLLAR     0x2000
 
 
 /* Render Markdown into HTML.