diff options
Diffstat (limited to 'tex/context/base/syst-ext.tex')
| -rw-r--r-- | tex/context/base/syst-ext.tex | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/tex/context/base/syst-ext.tex b/tex/context/base/syst-ext.tex index 9b64e25ae..afda909c2 100644 --- a/tex/context/base/syst-ext.tex +++ b/tex/context/base/syst-ext.tex @@ -1862,7 +1862,8 @@ \next} %D \macros -%D {appendtocommalist,addtocommalist,removefromcommalist} +%D {appendtocommalist,prependtocommalist, +%D addtocommalist,removefromcommalist} %D %D When working with comma separated lists, one sooner or %D later want the tools to append or remove items from such a @@ -1894,7 +1895,8 @@ %D also provided: %D %D \starttypen -%D \appendtocommalist {something} \name +%D \appendtocommalist {something} \name +%D \prependtocommalist {something} \name %D \stoptypen \def\appendtocommalist#1#2% @@ -1904,14 +1906,34 @@ \dodoglobal\edef#2{#2,#1}% \fi} +\def\prependtocommalist#1#2% + {\ifx#2\empty + \dodoglobal\edef#2{#1}% + \else % no test on empty + \dodoglobal\edef#2{#1,#2}% + \fi} + \def\addtocommalist#1#2% - {\doifelse{#2}{} - {\dodoglobal\edef#2{#1}} - {\edef\!!stringa{#2,,}% - \beforesplitstring#2\at,,\to#2\relax - \ExpandBothAfter\doifinsetelse{#1}{#2} - {\resetglobal} - {\dodoglobal\edef#2{#2,#1}}}} + {\ifx#2\empty + \dodoglobal\edef#2{#1}% + \else + \edef\!!stringa{#2,,}% + \beforesplitstring#2\at,,\to#2\relax + \ExpandBothAfter\doifinsetelse{#1}{#2} + {\resetglobal} + {\dodoglobal\edef#2{#2,#1}}% + \fi} + +\def\pretocommalist#1#2% + {\ifx#2\empty + \dodoglobal\edef#2{#1}% + \else + \edef\!!stringa{#2,,}% + \beforesplitstring#2\at,,\to#2\relax + \ExpandBothAfter\doifinsetelse{#1}{#2} + {\resetglobal} + {\dodoglobal\edef#2{#1,#2}}% + \fi} \def\doremovefromcommalist#1#2#3% nog \doglobal {\edef\!!stringa{,,#3,,}% |