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How to check if comma list is empty?


How to process a comma separated list?Sorting Comma Separated Lists defined with, or without macroEmulating @ifnextchar in expl3Check if a number is in a comma separated list (print or display selected sections from a specific list)Extract from a token containing a list with math contentHow to test whether pic text is empty in TiKZ?Membership check on comma separated listHow to sort a comma separated list?expl3 read a comma list from fileHow to suppress comma list from outputting its values on declaration?













1















How do I check if myList is empty? Following (is my attempt) prints "NOT empty" when, in fact, the list is empty.



documentclassstandalone
usepackageexpl3
begindocument
 ExplSyntaxOn
 clist_new:NmyList
 clist_set:NnmyList
 cs_if_eq:NNTFmyListEMPTYNOT empty
 ExplSyntaxOff
enddocument


EDIT: I found a way to do so (below) but would like you to share another approach (it's interesting to see how else it can be done):



 clist_new:NmyList
 clist_new:NemptyList
 clist_set:NnmyList % assign "emptiness" to the list (although it had already been empty to begin with)
 cs_if_eq:NNTFmyListemptyListEMPTYNOT empty





conditionals expl3 latex3 comma-separated-list







share|improve this question



















  • 3





    clist_if_empty:NTF.

    – Ulrike Fischer
    4 hours ago






  • 2





    What Ulrike said, plus the “proper” way to make a clist empty is clist_clear:N myList. (Deep down is basically the same, but exist for semantics).

    – Phelype Oleinik
    4 hours ago















1















How do I check if myList is empty? Following (is my attempt) prints "NOT empty" when, in fact, the list is empty.



documentclassstandalone
usepackageexpl3
begindocument
 ExplSyntaxOn
 clist_new:NmyList
 clist_set:NnmyList
 cs_if_eq:NNTFmyListEMPTYNOT empty
 ExplSyntaxOff
enddocument


EDIT: I found a way to do so (below) but would like you to share another approach (it's interesting to see how else it can be done):



 clist_new:NmyList
 clist_new:NemptyList
 clist_set:NnmyList % assign "emptiness" to the list (although it had already been empty to begin with)
 cs_if_eq:NNTFmyListemptyListEMPTYNOT empty





conditionals expl3 latex3 comma-separated-list







share|improve this question



















  • 3





    clist_if_empty:NTF.

    – Ulrike Fischer
    4 hours ago






  • 2





    What Ulrike said, plus the “proper” way to make a clist empty is clist_clear:N myList. (Deep down is basically the same, but exist for semantics).

    – Phelype Oleinik
    4 hours ago













1












1








1








How do I check if myList is empty? Following (is my attempt) prints "NOT empty" when, in fact, the list is empty.



documentclassstandalone
usepackageexpl3
begindocument
 ExplSyntaxOn
 clist_new:NmyList
 clist_set:NnmyList
 cs_if_eq:NNTFmyListEMPTYNOT empty
 ExplSyntaxOff
enddocument


EDIT: I found a way to do so (below) but would like you to share another approach (it's interesting to see how else it can be done):



 clist_new:NmyList
 clist_new:NemptyList
 clist_set:NnmyList % assign "emptiness" to the list (although it had already been empty to begin with)
 cs_if_eq:NNTFmyListemptyListEMPTYNOT empty





conditionals expl3 latex3 comma-separated-list







share|improve this question
















How do I check if myList is empty? Following (is my attempt) prints "NOT empty" when, in fact, the list is empty.



documentclassstandalone
usepackageexpl3
begindocument
 ExplSyntaxOn
 clist_new:NmyList
 clist_set:NnmyList
 cs_if_eq:NNTFmyListEMPTYNOT empty
 ExplSyntaxOff
enddocument


EDIT: I found a way to do so (below) but would like you to share another approach (it's interesting to see how else it can be done):



 clist_new:NmyList
 clist_new:NemptyList
 clist_set:NnmyList % assign "emptiness" to the list (although it had already been empty to begin with)
 cs_if_eq:NNTFmyListemptyListEMPTYNOT empty





conditionals expl3 latex3 comma-separated-list




conditionals expl3 latex3 comma-separated-list






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 5 hours ago







bp2017

















asked 5 hours ago









bp2017bp2017

920116




920116







  • 3





    clist_if_empty:NTF.

    – Ulrike Fischer
    4 hours ago






  • 2





    What Ulrike said, plus the “proper” way to make a clist empty is clist_clear:N myList. (Deep down is basically the same, but exist for semantics).

    – Phelype Oleinik
    4 hours ago












  • 3





    clist_if_empty:NTF.

    – Ulrike Fischer
    4 hours ago






  • 2





    What Ulrike said, plus the “proper” way to make a clist empty is clist_clear:N myList. (Deep down is basically the same, but exist for semantics).

    – Phelype Oleinik
    4 hours ago







3




3





clist_if_empty:NTF.

– Ulrike Fischer
4 hours ago





clist_if_empty:NTF.

– Ulrike Fischer
4 hours ago




2




2





What Ulrike said, plus the “proper” way to make a clist empty is clist_clear:N myList. (Deep down is basically the same, but exist for semantics).

– Phelype Oleinik
4 hours ago





What Ulrike said, plus the “proper” way to make a clist empty is clist_clear:N myList. (Deep down is basically the same, but exist for semantics).

– Phelype Oleinik
4 hours ago










2 Answers
2






active

oldest

votes


















4














documentclassstandalone
usepackageexpl3
begindocument
ExplSyntaxOn
clist_new:NmyList
clist_set:NnmyList
clist_if_empty:NTF myList EMPTY NOT EMPTY 
ExplSyntaxOff
enddocument


run texdoc l3clist






share|improve this answer























  • How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

    – bp2017
    4 hours ago







  • 1





    See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

    – Joseph Wright♦
    4 hours ago











  • @JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

    – bp2017
    4 hours ago






  • 1





    @bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

    – Joseph Wright♦
    3 hours ago






  • 1





    @bp2017 You want the predicates: clist_if_empty_p:N, and so on

    – Joseph Wright♦
    3 hours ago


















6














The test you want is clist_if_empty:N(TF): each data type has an appropriate test for emptiness or similar. These are defined such that they are 'aware' of the internal nature of data types (for example an empty prop is not entirely empty at the macro level).



Your cs_if_empty:NN(TF) test is wrong as the second argument you have given is no N type (a single token), but is rather n-type (in this case, an empty token list). You could in this case do a low-level test, for example



cs_if_eq:NN(TF) myList c_empty_clist <true> <false>


or by expanding the list to a 'raw' token list



tl_if_blank:V(TF) c_empty_clist <true> <false>





share|improve this answer























  • There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

    – bp2017
    4 hours ago







  • 1





    @bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

    – Joseph Wright♦
    4 hours ago











  • Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

    – bp2017
    4 hours ago












Your Answer








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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









4














documentclassstandalone
usepackageexpl3
begindocument
ExplSyntaxOn
clist_new:NmyList
clist_set:NnmyList
clist_if_empty:NTF myList EMPTY NOT EMPTY 
ExplSyntaxOff
enddocument


run texdoc l3clist






share|improve this answer























  • How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

    – bp2017
    4 hours ago







  • 1





    See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

    – Joseph Wright♦
    4 hours ago











  • @JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

    – bp2017
    4 hours ago






  • 1





    @bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

    – Joseph Wright♦
    3 hours ago






  • 1





    @bp2017 You want the predicates: clist_if_empty_p:N, and so on

    – Joseph Wright♦
    3 hours ago















4














documentclassstandalone
usepackageexpl3
begindocument
ExplSyntaxOn
clist_new:NmyList
clist_set:NnmyList
clist_if_empty:NTF myList EMPTY NOT EMPTY 
ExplSyntaxOff
enddocument


run texdoc l3clist






share|improve this answer























  • How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

    – bp2017
    4 hours ago







  • 1





    See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

    – Joseph Wright♦
    4 hours ago











  • @JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

    – bp2017
    4 hours ago






  • 1





    @bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

    – Joseph Wright♦
    3 hours ago






  • 1





    @bp2017 You want the predicates: clist_if_empty_p:N, and so on

    – Joseph Wright♦
    3 hours ago













4












4








4







documentclassstandalone
usepackageexpl3
begindocument
ExplSyntaxOn
clist_new:NmyList
clist_set:NnmyList
clist_if_empty:NTF myList EMPTY NOT EMPTY 
ExplSyntaxOff
enddocument


run texdoc l3clist






share|improve this answer













documentclassstandalone
usepackageexpl3
begindocument
ExplSyntaxOn
clist_new:NmyList
clist_set:NnmyList
clist_if_empty:NTF myList EMPTY NOT EMPTY 
ExplSyntaxOff
enddocument


run texdoc l3clist







share|improve this answer












share|improve this answer



share|improve this answer










answered 4 hours ago









Red-CloudRed-Cloud

2,04312




2,04312












  • How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

    – bp2017
    4 hours ago







  • 1





    See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

    – Joseph Wright♦
    4 hours ago











  • @JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

    – bp2017
    4 hours ago






  • 1





    @bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

    – Joseph Wright♦
    3 hours ago






  • 1





    @bp2017 You want the predicates: clist_if_empty_p:N, and so on

    – Joseph Wright♦
    3 hours ago

















  • How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

    – bp2017
    4 hours ago







  • 1





    See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

    – Joseph Wright♦
    4 hours ago











  • @JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

    – bp2017
    4 hours ago






  • 1





    @bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

    – Joseph Wright♦
    3 hours ago






  • 1





    @bp2017 You want the predicates: clist_if_empty_p:N, and so on

    – Joseph Wright♦
    3 hours ago
















How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

– bp2017
4 hours ago






How can I use AND (&&) during this clist_if_empty check to also perform check on additional list (or on something else) in one directive?

– bp2017
4 hours ago





1




1





See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

– Joseph Wright♦
4 hours ago





See bool_if:nTF or (better) e.g. bool_lazy_or:nnTF, all in interface3.

– Joseph Wright♦
4 hours ago













@JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

– bp2017
4 hours ago





@JosephWright, thank you. I've seen those and read a bit about them but I have no idea how to combine them with a conditional statement like clist_if_empty. I'll take a look again and see if I can find this information this time.

– bp2017
4 hours ago




1




1





@bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

– Joseph Wright♦
3 hours ago





@bp2017 You can always use the c-type variants, e..g clist_new:c myList2 . Note though that there is no escaping the catcode and token basis of TeX. Also note that standard expl3 style would be l_bp_mylist_clist or similar.

– Joseph Wright♦
3 hours ago




1




1





@bp2017 You want the predicates: clist_if_empty_p:N, and so on

– Joseph Wright♦
3 hours ago





@bp2017 You want the predicates: clist_if_empty_p:N, and so on

– Joseph Wright♦
3 hours ago











6














The test you want is clist_if_empty:N(TF): each data type has an appropriate test for emptiness or similar. These are defined such that they are 'aware' of the internal nature of data types (for example an empty prop is not entirely empty at the macro level).



Your cs_if_empty:NN(TF) test is wrong as the second argument you have given is no N type (a single token), but is rather n-type (in this case, an empty token list). You could in this case do a low-level test, for example



cs_if_eq:NN(TF) myList c_empty_clist <true> <false>


or by expanding the list to a 'raw' token list



tl_if_blank:V(TF) c_empty_clist <true> <false>





share|improve this answer























  • There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

    – bp2017
    4 hours ago







  • 1





    @bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

    – Joseph Wright♦
    4 hours ago











  • Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

    – bp2017
    4 hours ago
















6














The test you want is clist_if_empty:N(TF): each data type has an appropriate test for emptiness or similar. These are defined such that they are 'aware' of the internal nature of data types (for example an empty prop is not entirely empty at the macro level).



Your cs_if_empty:NN(TF) test is wrong as the second argument you have given is no N type (a single token), but is rather n-type (in this case, an empty token list). You could in this case do a low-level test, for example



cs_if_eq:NN(TF) myList c_empty_clist <true> <false>


or by expanding the list to a 'raw' token list



tl_if_blank:V(TF) c_empty_clist <true> <false>





share|improve this answer























  • There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

    – bp2017
    4 hours ago







  • 1





    @bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

    – Joseph Wright♦
    4 hours ago











  • Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

    – bp2017
    4 hours ago














6












6








6







The test you want is clist_if_empty:N(TF): each data type has an appropriate test for emptiness or similar. These are defined such that they are 'aware' of the internal nature of data types (for example an empty prop is not entirely empty at the macro level).



Your cs_if_empty:NN(TF) test is wrong as the second argument you have given is no N type (a single token), but is rather n-type (in this case, an empty token list). You could in this case do a low-level test, for example



cs_if_eq:NN(TF) myList c_empty_clist <true> <false>


or by expanding the list to a 'raw' token list



tl_if_blank:V(TF) c_empty_clist <true> <false>





share|improve this answer













The test you want is clist_if_empty:N(TF): each data type has an appropriate test for emptiness or similar. These are defined such that they are 'aware' of the internal nature of data types (for example an empty prop is not entirely empty at the macro level).



Your cs_if_empty:NN(TF) test is wrong as the second argument you have given is no N type (a single token), but is rather n-type (in this case, an empty token list). You could in this case do a low-level test, for example



cs_if_eq:NN(TF) myList c_empty_clist <true> <false>


or by expanding the list to a 'raw' token list



tl_if_blank:V(TF) c_empty_clist <true> <false>






share|improve this answer












share|improve this answer



share|improve this answer










answered 4 hours ago









Joseph Wright♦Joseph Wright

207k23568897




207k23568897












  • There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

    – bp2017
    4 hours ago







  • 1





    @bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

    – Joseph Wright♦
    4 hours ago











  • Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

    – bp2017
    4 hours ago


















  • There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

    – bp2017
    4 hours ago







  • 1





    @bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

    – Joseph Wright♦
    4 hours ago











  • Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

    – bp2017
    4 hours ago

















There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

– bp2017
4 hours ago






There is a style in tikzset named myStyle, I tried to pass #1 of that style (which contains all the arguments passed to the style, supplied through a node or a path directive which calls that style with or without arguments) inside /utils/exec as clist_set:NnmyList#1. But for some reason when the style is used with no arguments (like path node[myStyle];), the list is NOT empty (it's empty only when path node[myStyle=];). I'm trying to figure out why I get such result (and trying to look what #1 contains in this case, but having difficulties so far).

– bp2017
4 hours ago





1




1





@bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

– Joseph Wright♦
4 hours ago





@bp2017 There is some 'back end' in pgf that may be responsible, but I'd be tempted just to showtokens the input #1.

– Joseph Wright♦
4 hours ago













Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

– bp2017
4 hours ago






Great! Here is the answer: showtokens pgfkeysnovalue . So I'll be checking against this pgfkeysnovalue in case no arguments were supplied at all.

– bp2017
4 hours ago


















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