From 39ba42c3b21d08ec606eee18ee8b64c67ec6a42a Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <dimitri@stack.nl>
Date: Sun, 5 Apr 2015 20:52:42 +0200
Subject: Added documentation for ``` style fenced code block and more robust
 parsing

---
 doc/markdown.doc |  6 ++++++
 src/pre.l        | 10 +++++-----
 src/scanner.l    |  8 ++++----
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/doc/markdown.doc b/doc/markdown.doc
index a35b802..87af3d8 100644
--- a/doc/markdown.doc
+++ b/doc/markdown.doc
@@ -390,6 +390,12 @@ int func(int a,int b) { return a*b; }
 
 The curly braces and dot are optional by the way.
 
+Another way to denote fenced code blocks is to use 3 or more backticks (```):
+
+    ```
+    also a fenced code block
+    ```
+
 \subsection md_header_id Header Id Attributes
 
 Standard Markdown has no support for labeling headers, which
diff --git a/src/pre.l b/src/pre.l
index 92912e6..ab2ad6f 100644
--- a/src/pre.l
+++ b/src/pre.l
@@ -2452,7 +2452,7 @@ CHARLIT   (("'"\\[0-7]{1,3}"'")|("'"\\."'")|("'"[^'\\\n]{1,4}"'"))
 <SkipCComment>[\\@][\\@]("f{"|"f$"|"f[") {
   					  outputArray(yytext,(int)yyleng);
   					}
-<SkipCComment>"~~~"[~]*                 {
+<SkipCComment>^({B}*"*"+)?{B}{0,3}"~~~"[~]*   {
                                           static bool markdownSupport = Config_getBool("MARKDOWN_SUPPORT");
                                           if (!markdownSupport)
                                           {
@@ -2465,7 +2465,7 @@ CHARLIT   (("'"\\[0-7]{1,3}"'")|("'"\\."'")|("'"[^'\\\n]{1,4}"'"))
                                             BEGIN(SkipVerbatim);
                                           }
                                         }
-<SkipCComment>"```"[`]*                 {
+<SkipCComment>^({B}*"*"+)?{B}{0,3}"```"[`]*            {
                                           static bool markdownSupport = Config_getBool("MARKDOWN_SUPPORT");
                                           if (!markdownSupport)
                                           {
@@ -2612,14 +2612,14 @@ CHARLIT   (("'"\\[0-7]{1,3}"'")|("'"\\."'")|("'"[^'\\\n]{1,4}"'"))
 					    BEGIN(SkipCComment);
 					  }
   					}
-<SkipVerbatim>"~~~"[~]*                 {
+<SkipVerbatim>^({B}*"*"+)?{B}{0,3}"~~~"[~]*                 {
   					  outputArray(yytext,(int)yyleng);
                                           if (g_fenceSize==yyleng)
                                           {
                                             BEGIN(SkipCComment);
                                           }
                                         }
-<SkipVerbatim>"```"[`]*                 {
+<SkipVerbatim>^({B}*"*"+)?{B}{0,3}"```"[`]*                 {
   					  outputArray(yytext,(int)yyleng);
                                           if (g_fenceSize==yyleng)
                                           {
@@ -2629,7 +2629,7 @@ CHARLIT   (("'"\\[0-7]{1,3}"'")|("'"\\."'")|("'"[^'\\\n]{1,4}"'"))
 <SkipVerbatim>"*/"|"/*"			{
   					  outputArray(yytext,(int)yyleng);
   					}
-<SkipCComment,SkipVerbatim>[^*\\@\x06~\n\/]+ {
+<SkipCComment,SkipVerbatim>[^*\\@\x06~`\n\/]+ {
   					  outputArray(yytext,(int)yyleng);
   					}
 <SkipCComment,SkipVerbatim>\n		{ 
diff --git a/src/scanner.l b/src/scanner.l
index c309289..b11d777 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -6264,14 +6264,14 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
                                           g_nestedComment=FALSE;
   					  BEGIN(DocCopyBlock);
   					}
-<DocBlock>"~~~"[~]*                     {
+<DocBlock>^({B}*"*"+)?{B}{0,3}"~~~"[~]*                {
                                           docBlock+=yytext;
                                           docBlockName="~~~";
                                           g_fencedSize=yyleng;
                                           g_nestedComment=FALSE;
                                           BEGIN(DocCopyBlock);
                                         }
-<DocBlock>"```"[`]*                     {
+<DocBlock>^({B}*"*"+)?{B}{0,3}"```"[`]*                {
                                           docBlock+=yytext;
                                           docBlockName="```";
                                           g_fencedSize=yyleng;
@@ -6389,14 +6389,14 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					    REJECT;
 					  }
   					}
-<DocCopyBlock>"~~~"[~]*                 {
+<DocCopyBlock>^({B}*"*"+)?{B}{0,3}"~~~"[~]* {
                                           docBlock+=yytext;
                                           if (g_fencedSize==yyleng)
                                           {
                                             BEGIN(DocBlock);
                                           }
                                         }
-<DocCopyBlock>"```"[`]*                 {
+<DocCopyBlock>^({B}*"*"+)?{B}{0,3}"```"[`]*                 {
                                           docBlock+=yytext;
                                           if (g_fencedSize==yyleng)
                                           {
-- 
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