$$ \gdef\block#1#2#3#4#5{ \begin{aligned} &\texttt{#1 } #4 \texttt{ #2} \\ &\enspace \left#3 \enspace \begin{aligned} #5 \end{aligned} \right. \end{aligned} } \gdef\if#1#2{\block{si}{alors}{|}{#1}{#2}} \gdef\eif#1#2{\block{si}{alors}{\lfloor}{#1}{#2}} \gdef\elif#1#2{\block{sinon si}{alors}{|}{#1}{#2}} \gdef\eelif#1#2{\block{sinon si}{alors}{\lfloor}{#1}{#2}} \gdef\else#1{\block{sinon}{}{\lfloor}{}{#1}} \gdef\for#1#2{\block{pour}{faire}{\lfloor}{#1}{#2}} \gdef\foreach#1#2{\block{pour tout}{faire}{\lfloor}{#1}{#2}} $$