1 files changed, 53 insertions, 0 deletions
diff --git a/doc/libs/ian.cls b/doc/libs/ian.cls
index f29e6bd..762f679 100644
--- a/doc/libs/ian.cls
+++ b/doc/libs/ian.cls
@@ -219,6 +219,7 @@
   % counters
   \stepcounter{subsectioncount}
   \setcounter{subsubsectioncount}{0}
+  \setcounter{subsubsubsectioncount}{0}
   \ifsubsectionsineq
     \setcounter{seqcount}0
   \fi
@@ -268,6 +269,7 @@
 \def\subsubsection#1{
   % counters
   \stepcounter{subsubsectioncount}
+  \setcounter{subsubsubsectioncount}{0}
 
   % space before subsubsection (if not first)
   \ifnum\thesubsubsectioncount>1
@@ -302,6 +304,49 @@
   \medskip\penalty10000
 }
 
+%% subsubsubsection
+% counter
+\newcounter{subsubsubsectioncount}
+% space before subsubsubsection
+\newlength\subsubsubsecskip
+\setlength\subsubsubsecskip{20pt}
+\def\subsubsubsection#1{
+  % counters
+  \stepcounter{subsubsubsectioncount}
+
+  % space before subsubsubsection (if not first)
+  \ifnum\thesubsubsubsectioncount>1
+    \vskip\subsubsubsecskip
+    \penalty-500
+  \fi
+
+  % hyperref anchor
+  \hrefanchor
+  % define tag (for \label)
+  \xdef\tag{\sectionprefix\thesectioncount.\thesubsectioncount.\thesubsubsectioncount.\thesubsubsubsectioncount}
+
+  % get widths
+  \def\@secnum{{\bf\hskip1.5cm\sectionprefix\thesectioncount.\thesubsectioncount.\thesubsubsectioncount.\thesubsubsubsectioncount.\hskip5pt}}
+  \settowidth\secnumwidth{\@secnum}
+  \setlength\sectitlewidth\textwidth
+  \addtolength\sectitlewidth{-\secnumwidth}
+  % print name
+  \parbox{\textwidth}{
+  \@secnum
+  \parbox[t]{\sectitlewidth}{\bf #1}}
+
+  % write to table of contents
+  \iftoc
+    % save lncount in aux variable which is written to toc
+    \immediate\write\tocoutput{\noexpand\expandafter\noexpand\edef\noexpand\csname toc@subsubsubsec.\thesectioncount.\thesubsectioncount.\thesubsubsectioncount.\thesubsubsubsectioncount\endcsname{\thelncount}}
+    \write\tocoutput{\noexpand\tocsubsubsubsection{#1}{\thepage}}
+  \fi
+
+  % space
+  \par\penalty10000
+  \medskip\penalty10000
+}
+
 %% itemize
 \newlength\itemizeskip
 % left margin for items
@@ -638,6 +683,7 @@
   \stepcounter{tocsectioncount}
   \setcounter{tocsubsectioncount}{0}
   \setcounter{tocsubsubsectioncount}{0}
+  \setcounter{tocsubsubsubsectioncount}{0}
   % write
   \smallskip\hyperlink{ln.\csname toc@sec.\thetocsectioncount\endcsname}{{\bf \tocsectionprefix\thetocsectioncount}.\hskip5pt {\color{blue}#1}\leaderfill#2}\par
 }
@@ -645,6 +691,7 @@
 \def\tocsubsection #1#2{
   \stepcounter{tocsubsectioncount}
   \setcounter{tocsubsubsectioncount}{0}
+  \setcounter{tocsubsubsubsectioncount}{0}
   % write
   {\hskip10pt\hyperlink{ln.\csname toc@subsec.\thetocsectioncount.\thetocsubsectioncount\endcsname}{{\bf \thetocsectioncount.\thetocsubsectioncount}.\hskip5pt {\color{blue}\small #1}\leaderfill#2}}\par
 }
@@ -654,6 +701,12 @@
   % write
   {\hskip20pt\hyperlink{ln.\csname toc@subsubsec.\thetocsectioncount.\thetocsubsectioncount.\thetocsubsubsectioncount\endcsname}{{\bf \thetocsectioncount.\thetocsubsectioncount.\thetocsubsubsectioncount}.\hskip5pt {\color{blue}\small #1}\leaderfill#2}}\par
 }
+\newcounter{tocsubsubsubsectioncount}
+\def\tocsubsubsubsection #1#2{
+  \stepcounter{tocsubsubsubsectioncount}
+  % write
+  {\hskip30pt\hyperlink{ln.\csname toc@subsubsubsec.\thetocsectioncount.\thetocsubsectioncount.\thetocsubsubsectioncount.\thetocsubsubsubsectioncount\endcsname}{{\bf \thetocsectioncount.\thetocsubsectioncount.\thetocsubsubsectioncount.\thetocsubsubsubsectioncount}.\hskip5pt {\color{blue}\small #1}\leaderfill#2}}\par
+}
 \def\tocappendices{
   \medskip
   \setcounter{tocsectioncount}0