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tlrepr.sty
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tlrepr.sty
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\ProvidesExplPackage{tlrepr}{2022/04/16}{0.0.0}{Get reversible string representation of a token list}
\RequirePackage{precattl}
\precattl_exec:n {
% ** main function:
% set #1 to something that when scantokens then x-expanded, would be identical to #2.
% e.g. if #2 is \relax, set #1 to string representation of "\noexpand\relax"
% it's guaranteed that #1 will contain only "normal" characters
% the result works in both \ExplSyntaxOn and normal region
\cs_set_protected:Npn \tlrepr_set:Nn #1 #2 {
\def #1 {}
\tl_analysis_map_inline:nn {#2} {
% ##1: token, ##2: char, ##3: cat
\str_if_eq:nnTF {##3} {0} { % is control sequence.
% store the control sequence name here
\tl_if_eq:onTF {##1} {\cC {}} {
\tl_set:Nn \_tlrepr_tmp_csname {}
}
{
\tl_set:Nx \_tlrepr_tmp_csname {\expandafter \cs_to_str:N ##1}
}
% check if it's "normal" csname.
\str_if_empty:NTF \_tlrepr_tmp_csname {
\let \_tlrepr_normal_csname \c_false_bool
}
{
\let \_tlrepr_normal_csname \c_true_bool
\str_map_inline:Nn \_tlrepr_tmp_csname {
% ####1: the character
\bool_if:nF {
\int_compare_p:n { `a <= `####1 <= `z } ||
\int_compare_p:n { `A <= `####1 <= `Z }
}
{
\let \_tlrepr_normal_csname \c_false_bool
\str_map_break:
}
}
}
\bool_if:NTF \_tlrepr_normal_csname {
\tl_put_right:Nn #1 {\cO{\\noexpand\\}}
\tl_put_right:NV #1 \_tlrepr_tmp_csname
\tl_put_right:Nn #1 {~}
}
{
% use \tlreprCS to generate the csname
\tl_put_right:Nn #1 {\cO{\\tlreprCS}~}
\_tlrepr_set_simple:NV \_tlrepr_tmp \_tlrepr_tmp_csname
\tl_put_right:NV #1 \_tlrepr_tmp
\tl_put_right:Nn #1 {\cO{\\endcsname}~}
}
}
{
% is not control sequence
\str_if_eq:nnTF {##3} {A} {
% space. old version of char_generate does not support generating funny space
\int_compare:nNnTF {##2} = {`\ } {
\tl_put_right:Nn #1 {\cO{\\tlreprSP}~}
}
{
\msg_error:nn {tlrepr} {funny-space}
}
}
{
% is not space
\int_compare:nNnTF {\cs_if_exist_use:cF {_tlrepr_nc_ ##2} {0}} = {"##3} {
% good, natural catcode
%\pretty:n {##2}
\tl_put_right:Nx #1 { \char_generate:nn {##2} {12} } % 12: other
}
{
\tl_put_right:Nn #1 { \cO{\\tlreprCG} {##2} {"##3} }
}
}
}
}
}
% similar to above, but instead of identical they only need to behave the same under \write etc. (catcode can be different)
\cs_set_protected:Npn \_tlrepr_set_simple:Nn #1 #2 {
%\tlrepr_set:Nn #1 {#2} % (will optimize later...)
\def #1 {}
\str_map_inline:nn {#2} {
% ##1: the character
\cs_if_exist:cTF {_tlrepr_cs_ ##1} {
\tl_put_right:Nn #1 {##1}
}
{
\tl_put_right:Nx #1 { \cO{\\tlreprCG} {\number`##1} {12} } % 12: other
}
}
}
}
\cs_generate_variant:Nn \tl_set:Nn {cn}
\cs_generate_variant:Nn \cs_set_eq:NN {cN}
\cs_generate_variant:Nn \tl_if_eq:nnTF {onTF}
\cs_generate_variant:Nn \tl_set:Nn {Nx}
\cs_generate_variant:Nn \tl_put_right:Nn {NV}
\cs_generate_variant:Nn \_tlrepr_set_simple:Nn {NV}
\cs_generate_variant:Nn \cs_if_exist_use:NF {cF}
\cs_generate_variant:Nn \tl_put_right:Nn {Nx}
\cs_generate_variant:Nn \cs_if_exist:NTF {cTF}
% x-expand to (noexpand <result>) or equivalent.
% #1: char code, #2: catcode
\def\tlreprCG #1 #2 {
\expandafter \expandafter \expandafter \noexpand \char_generate:nn {#1} {#2}
}
\let\tlreprSP\c_space_tl
\def\tlreprCS{ \expandafter \noexpand \csname }
% check if something can safely appear verbatim.
% #1: number of that character, #2: its natural catcode.
\def\_tlrepr_natural_catcode:nn #1 #2 {
\tl_set:cn {_tlrepr_nc_ \number #1 } {#2}
}
\_tlrepr_natural_catcode:nn { `\! } { 12 }
\_tlrepr_natural_catcode:nn { `\" } { 12 }
\_tlrepr_natural_catcode:nn { `\# } { 6 }
\_tlrepr_natural_catcode:nn { `\$ } { 3 }
\_tlrepr_natural_catcode:nn { `\& } { 4 }
\_tlrepr_natural_catcode:nn { `\' } { 12 }
\_tlrepr_natural_catcode:nn { `\( } { 12 }
\_tlrepr_natural_catcode:nn { `\) } { 12 }
\_tlrepr_natural_catcode:nn { `\* } { 12 }
\_tlrepr_natural_catcode:nn { `\+ } { 12 }
\_tlrepr_natural_catcode:nn { `\, } { 12 }
\_tlrepr_natural_catcode:nn { `\- } { 12 }
\_tlrepr_natural_catcode:nn { `\. } { 12 }
\_tlrepr_natural_catcode:nn { `\/ } { 12 }
\_tlrepr_natural_catcode:nn { `\0 } { 12 }
\_tlrepr_natural_catcode:nn { `\1 } { 12 }
\_tlrepr_natural_catcode:nn { `\2 } { 12 }
\_tlrepr_natural_catcode:nn { `\3 } { 12 }
\_tlrepr_natural_catcode:nn { `\4 } { 12 }
\_tlrepr_natural_catcode:nn { `\5 } { 12 }
\_tlrepr_natural_catcode:nn { `\6 } { 12 }
\_tlrepr_natural_catcode:nn { `\7 } { 12 }
\_tlrepr_natural_catcode:nn { `\8 } { 12 }
\_tlrepr_natural_catcode:nn { `\9 } { 12 }
\_tlrepr_natural_catcode:nn { `\; } { 12 }
\_tlrepr_natural_catcode:nn { `\< } { 12 }
\_tlrepr_natural_catcode:nn { `\= } { 12 }
\_tlrepr_natural_catcode:nn { `\> } { 12 }
\_tlrepr_natural_catcode:nn { `\? } { 12 }
\_tlrepr_natural_catcode:nn { `\@ } { 12 }
\_tlrepr_natural_catcode:nn { `\A } { 11 }
\_tlrepr_natural_catcode:nn { `\B } { 11 }
\_tlrepr_natural_catcode:nn { `\C } { 11 }
\_tlrepr_natural_catcode:nn { `\D } { 11 }
\_tlrepr_natural_catcode:nn { `\E } { 11 }
\_tlrepr_natural_catcode:nn { `\F } { 11 }
\_tlrepr_natural_catcode:nn { `\G } { 11 }
\_tlrepr_natural_catcode:nn { `\H } { 11 }
\_tlrepr_natural_catcode:nn { `\I } { 11 }
\_tlrepr_natural_catcode:nn { `\J } { 11 }
\_tlrepr_natural_catcode:nn { `\K } { 11 }
\_tlrepr_natural_catcode:nn { `\L } { 11 }
\_tlrepr_natural_catcode:nn { `\M } { 11 }
\_tlrepr_natural_catcode:nn { `\N } { 11 }
\_tlrepr_natural_catcode:nn { `\O } { 11 }
\_tlrepr_natural_catcode:nn { `\P } { 11 }
\_tlrepr_natural_catcode:nn { `\Q } { 11 }
\_tlrepr_natural_catcode:nn { `\R } { 11 }
\_tlrepr_natural_catcode:nn { `\S } { 11 }
\_tlrepr_natural_catcode:nn { `\T } { 11 }
\_tlrepr_natural_catcode:nn { `\U } { 11 }
\_tlrepr_natural_catcode:nn { `\V } { 11 }
\_tlrepr_natural_catcode:nn { `\W } { 11 }
\_tlrepr_natural_catcode:nn { `\X } { 11 }
\_tlrepr_natural_catcode:nn { `\Y } { 11 }
\_tlrepr_natural_catcode:nn { `\Z } { 11 }
\_tlrepr_natural_catcode:nn { `\[ } { 12 }
\_tlrepr_natural_catcode:nn { `\] } { 12 }
\_tlrepr_natural_catcode:nn { `\` } { 12 }
\_tlrepr_natural_catcode:nn { `\a } { 11 }
\_tlrepr_natural_catcode:nn { `\b } { 11 }
\_tlrepr_natural_catcode:nn { `\c } { 11 }
\_tlrepr_natural_catcode:nn { `\d } { 11 }
\_tlrepr_natural_catcode:nn { `\e } { 11 }
\_tlrepr_natural_catcode:nn { `\f } { 11 }
\_tlrepr_natural_catcode:nn { `\g } { 11 }
\_tlrepr_natural_catcode:nn { `\h } { 11 }
\_tlrepr_natural_catcode:nn { `\i } { 11 }
\_tlrepr_natural_catcode:nn { `\j } { 11 }
\_tlrepr_natural_catcode:nn { `\k } { 11 }
\_tlrepr_natural_catcode:nn { `\l } { 11 }
\_tlrepr_natural_catcode:nn { `\m } { 11 }
\_tlrepr_natural_catcode:nn { `\n } { 11 }
\_tlrepr_natural_catcode:nn { `\o } { 11 }
\_tlrepr_natural_catcode:nn { `\p } { 11 }
\_tlrepr_natural_catcode:nn { `\q } { 11 }
\_tlrepr_natural_catcode:nn { `\r } { 11 }
\_tlrepr_natural_catcode:nn { `\s } { 11 }
\_tlrepr_natural_catcode:nn { `\t } { 11 }
\_tlrepr_natural_catcode:nn { `\u } { 11 }
\_tlrepr_natural_catcode:nn { `\v } { 11 }
\_tlrepr_natural_catcode:nn { `\w } { 11 }
\_tlrepr_natural_catcode:nn { `\x } { 11 }
\_tlrepr_natural_catcode:nn { `\y } { 11 }
\_tlrepr_natural_catcode:nn { `\z } { 11 }
\_tlrepr_natural_catcode:nn { `\{ } { 1 }
\_tlrepr_natural_catcode:nn { `\| } { 12 }
\_tlrepr_natural_catcode:nn { `\} } { 2 }
%\_tlrepr_natural_catcode:nn { `\% } { 14 } % cannot appear in tl anyway
%\_tlrepr_natural_catcode:nn { `\\ } { 0 }
%\tlrepr_natural_catcode:nn { `\: } { -1 } % different in expl3
%\tlrepr_natural_catcode:nn { `\^ } { 7 } % avoid ^^X being specially interpreted
%\tlrepr_natural_catcode:nn { `\_ } { -1 } % different in expl3
% check if something can safely appear within \csname ... \endcsname.
% #1: \<that character>
% internally e.g. if \_tlrepr_cs_A is defined then A can appear
\def\_tlrepr_can_csname:N #1 {
\cs_set_eq:cN {_tlrepr_cs_ \cs_to_str:N #1 } \c_empty_tl
}
\_tlrepr_can_csname:N \!
\_tlrepr_can_csname:N \"
\_tlrepr_can_csname:N \#
\_tlrepr_can_csname:N \$
\_tlrepr_can_csname:N \&
\_tlrepr_can_csname:N \'
\_tlrepr_can_csname:N \(
\_tlrepr_can_csname:N \)
\_tlrepr_can_csname:N \*
\_tlrepr_can_csname:N \+
\_tlrepr_can_csname:N \,
\_tlrepr_can_csname:N \-
\_tlrepr_can_csname:N \.
\_tlrepr_can_csname:N \/
\_tlrepr_can_csname:N \0
\_tlrepr_can_csname:N \1
\_tlrepr_can_csname:N \2
\_tlrepr_can_csname:N \3
\_tlrepr_can_csname:N \4
\_tlrepr_can_csname:N \5
\_tlrepr_can_csname:N \6
\_tlrepr_can_csname:N \7
\_tlrepr_can_csname:N \8
\_tlrepr_can_csname:N \9
\_tlrepr_can_csname:N \:
\_tlrepr_can_csname:N \;
\_tlrepr_can_csname:N \<
\_tlrepr_can_csname:N \=
\_tlrepr_can_csname:N \>
\_tlrepr_can_csname:N \?
\_tlrepr_can_csname:N \@
\_tlrepr_can_csname:N \A
\_tlrepr_can_csname:N \B
\_tlrepr_can_csname:N \C
\_tlrepr_can_csname:N \D
\_tlrepr_can_csname:N \E
\_tlrepr_can_csname:N \F
\_tlrepr_can_csname:N \G
\_tlrepr_can_csname:N \H
\_tlrepr_can_csname:N \I
\_tlrepr_can_csname:N \J
\_tlrepr_can_csname:N \K
\_tlrepr_can_csname:N \L
\_tlrepr_can_csname:N \M
\_tlrepr_can_csname:N \N
\_tlrepr_can_csname:N \O
\_tlrepr_can_csname:N \P
\_tlrepr_can_csname:N \Q
\_tlrepr_can_csname:N \R
\_tlrepr_can_csname:N \S
\_tlrepr_can_csname:N \T
\_tlrepr_can_csname:N \U
\_tlrepr_can_csname:N \V
\_tlrepr_can_csname:N \W
\_tlrepr_can_csname:N \X
\_tlrepr_can_csname:N \Y
\_tlrepr_can_csname:N \Z
\_tlrepr_can_csname:N \[
\_tlrepr_can_csname:N \_
\_tlrepr_can_csname:N \]
\_tlrepr_can_csname:N \`
\_tlrepr_can_csname:N \a
\_tlrepr_can_csname:N \b
\_tlrepr_can_csname:N \c
\_tlrepr_can_csname:N \d
\_tlrepr_can_csname:N \e
\_tlrepr_can_csname:N \f
\_tlrepr_can_csname:N \g
\_tlrepr_can_csname:N \h
\_tlrepr_can_csname:N \i
\_tlrepr_can_csname:N \j
\_tlrepr_can_csname:N \k
\_tlrepr_can_csname:N \l
\_tlrepr_can_csname:N \m
\_tlrepr_can_csname:N \n
\_tlrepr_can_csname:N \o
\_tlrepr_can_csname:N \p
\_tlrepr_can_csname:N \q
\_tlrepr_can_csname:N \r
\_tlrepr_can_csname:N \s
\_tlrepr_can_csname:N \t
\_tlrepr_can_csname:N \u
\_tlrepr_can_csname:N \v
\_tlrepr_can_csname:N \w
\_tlrepr_can_csname:N \x
\_tlrepr_can_csname:N \y
\_tlrepr_can_csname:N \z
%\_tlrepr_can_csname:N \{ % if unbalanced is a problem
\_tlrepr_can_csname:N \|
%\_tlrepr_can_csname:N \}