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How to write a macro that is braces sensitive?
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In the xparse package, there is the g type of argument which captures things inside a pair of TeX group tokens. This makes it possible to define commands foo that behaves differently for foo{a} and foo a. I am interested in whether such type of macro is possible in plain TeX (I guess yes) and if it is possible, how can it be implemented. I am new to plain TeX and I appreciate detailed explanation of the workflow of such a macro. I would also be happy to learn about other possibilities such as in e-TeX instead of plain TeX.
macros plain-tex braces
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
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Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
In the xparse package, there is the g type of argument which captures things inside a pair of TeX group tokens. This makes it possible to define commands foo that behaves differently for foo{a} and foo a. I am interested in whether such type of macro is possible in plain TeX (I guess yes) and if it is possible, how can it be implemented. I am new to plain TeX and I appreciate detailed explanation of the workflow of such a macro. I would also be happy to learn about other possibilities such as in e-TeX instead of plain TeX.
macros plain-tex braces
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
It's possible, but it's bad syntax. Under normal TeX conventions,foo aandfoo{a}should be considered equivalent (when the argument consists of a single token as in this case).
– egreg
42 mins ago
Thank you for your quick reply. I know it's bad syntax otherwisexparsewould not declare it as obsolete, but it is (extensively) used in e.g.physicspackage. I am just not sure about whether it can be done in plain, or it requires some features of the engine.
– Weijun Zhou
38 mins ago
1
It's indeed used inphysics. My opinion about the package is that it has good ideas, but I can't recommend its usage. The weird syntax is just one among the several reasons for not recommending it.
– egreg
37 mins ago
Due to the weird syntax I end up addingrelaxhere and there ... but I guess I will still use it.
– Weijun Zhou
29 mins ago
add a comment |
In the xparse package, there is the g type of argument which captures things inside a pair of TeX group tokens. This makes it possible to define commands foo that behaves differently for foo{a} and foo a. I am interested in whether such type of macro is possible in plain TeX (I guess yes) and if it is possible, how can it be implemented. I am new to plain TeX and I appreciate detailed explanation of the workflow of such a macro. I would also be happy to learn about other possibilities such as in e-TeX instead of plain TeX.
macros plain-tex braces
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
In the xparse package, there is the g type of argument which captures things inside a pair of TeX group tokens. This makes it possible to define commands foo that behaves differently for foo{a} and foo a. I am interested in whether such type of macro is possible in plain TeX (I guess yes) and if it is possible, how can it be implemented. I am new to plain TeX and I appreciate detailed explanation of the workflow of such a macro. I would also be happy to learn about other possibilities such as in e-TeX instead of plain TeX.
macros plain-tex braces
macros plain-tex braces
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
asked 46 mins ago
Weijun ZhouWeijun Zhou
1134
1134
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Weijun Zhou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
It's possible, but it's bad syntax. Under normal TeX conventions,foo aandfoo{a}should be considered equivalent (when the argument consists of a single token as in this case).
– egreg
42 mins ago
Thank you for your quick reply. I know it's bad syntax otherwisexparsewould not declare it as obsolete, but it is (extensively) used in e.g.physicspackage. I am just not sure about whether it can be done in plain, or it requires some features of the engine.
– Weijun Zhou
38 mins ago
1
It's indeed used inphysics. My opinion about the package is that it has good ideas, but I can't recommend its usage. The weird syntax is just one among the several reasons for not recommending it.
– egreg
37 mins ago
Due to the weird syntax I end up addingrelaxhere and there ... but I guess I will still use it.
– Weijun Zhou
29 mins ago
add a comment |
It's possible, but it's bad syntax. Under normal TeX conventions,foo aandfoo{a}should be considered equivalent (when the argument consists of a single token as in this case).
– egreg
42 mins ago
Thank you for your quick reply. I know it's bad syntax otherwisexparsewould not declare it as obsolete, but it is (extensively) used in e.g.physicspackage. I am just not sure about whether it can be done in plain, or it requires some features of the engine.
– Weijun Zhou
38 mins ago
1
It's indeed used inphysics. My opinion about the package is that it has good ideas, but I can't recommend its usage. The weird syntax is just one among the several reasons for not recommending it.
– egreg
37 mins ago
Due to the weird syntax I end up addingrelaxhere and there ... but I guess I will still use it.
– Weijun Zhou
29 mins ago
It's possible, but it's bad syntax. Under normal TeX conventions,
foo a and foo{a} should be considered equivalent (when the argument consists of a single token as in this case).– egreg
42 mins ago
It's possible, but it's bad syntax. Under normal TeX conventions,
foo a and foo{a} should be considered equivalent (when the argument consists of a single token as in this case).– egreg
42 mins ago
Thank you for your quick reply. I know it's bad syntax otherwise
xparse would not declare it as obsolete, but it is (extensively) used in e.g. physics package. I am just not sure about whether it can be done in plain, or it requires some features of the engine.– Weijun Zhou
38 mins ago
Thank you for your quick reply. I know it's bad syntax otherwise
xparse would not declare it as obsolete, but it is (extensively) used in e.g. physics package. I am just not sure about whether it can be done in plain, or it requires some features of the engine.– Weijun Zhou
38 mins ago
1
1
It's indeed used in
physics. My opinion about the package is that it has good ideas, but I can't recommend its usage. The weird syntax is just one among the several reasons for not recommending it.– egreg
37 mins ago
It's indeed used in
physics. My opinion about the package is that it has good ideas, but I can't recommend its usage. The weird syntax is just one among the several reasons for not recommending it.– egreg
37 mins ago
Due to the weird syntax I end up adding
relax here and there ... but I guess I will still use it.– Weijun Zhou
29 mins ago
Due to the weird syntax I end up adding
relax here and there ... but I guess I will still use it.– Weijun Zhou
29 mins ago
add a comment |
1 Answer
1
active
oldest
votes
Fundamentally you just need to use futurelet as you do for any other look ahead
deffoo{futureletfooauxfootoken}
deffooaux{%
ifxfootokenbgroup
% Brace group
else
% Something else
fi
}
The only reason this 'looks different' to other peek ahead situations is that you can't use an explicit {, but rather the implicit token bgroup.
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
add a comment |
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1 Answer
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1 Answer
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oldest
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votes
Fundamentally you just need to use futurelet as you do for any other look ahead
deffoo{futureletfooauxfootoken}
deffooaux{%
ifxfootokenbgroup
% Brace group
else
% Something else
fi
}
The only reason this 'looks different' to other peek ahead situations is that you can't use an explicit {, but rather the implicit token bgroup.
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
add a comment |
Fundamentally you just need to use futurelet as you do for any other look ahead
deffoo{futureletfooauxfootoken}
deffooaux{%
ifxfootokenbgroup
% Brace group
else
% Something else
fi
}
The only reason this 'looks different' to other peek ahead situations is that you can't use an explicit {, but rather the implicit token bgroup.
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
add a comment |
Fundamentally you just need to use futurelet as you do for any other look ahead
deffoo{futureletfooauxfootoken}
deffooaux{%
ifxfootokenbgroup
% Brace group
else
% Something else
fi
}
The only reason this 'looks different' to other peek ahead situations is that you can't use an explicit {, but rather the implicit token bgroup.
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
Fundamentally you just need to use futurelet as you do for any other look ahead
deffoo{futureletfooauxfootoken}
deffooaux{%
ifxfootokenbgroup
% Brace group
else
% Something else
fi
}
The only reason this 'looks different' to other peek ahead situations is that you can't use an explicit {, but rather the implicit token bgroup.
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
answered 38 mins ago
Joseph Wright♦Joseph Wright
205k23563891
205k23563891
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
add a comment |
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
That's clear enough and much simpler than I originally imagined.
– Weijun Zhou
33 mins ago
add a comment |
Weijun Zhou is a new contributor. Be nice, and check out our Code of Conduct.
Weijun Zhou is a new contributor. Be nice, and check out our Code of Conduct.
Weijun Zhou is a new contributor. Be nice, and check out our Code of Conduct.
Weijun Zhou is a new contributor. Be nice, and check out our Code of Conduct.
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It's possible, but it's bad syntax. Under normal TeX conventions,
foo aandfoo{a}should be considered equivalent (when the argument consists of a single token as in this case).– egreg
42 mins ago
Thank you for your quick reply. I know it's bad syntax otherwise
xparsewould not declare it as obsolete, but it is (extensively) used in e.g.physicspackage. I am just not sure about whether it can be done in plain, or it requires some features of the engine.– Weijun Zhou
38 mins ago
1
It's indeed used in
physics. My opinion about the package is that it has good ideas, but I can't recommend its usage. The weird syntax is just one among the several reasons for not recommending it.– egreg
37 mins ago
Due to the weird syntax I end up adding
relaxhere and there ... but I guess I will still use it.– Weijun Zhou
29 mins ago