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diff --git a/Master/texmf-dist/tex/latex/tagpdf/tagpdf-checks-code.sty b/Master/texmf-dist/tex/latex/tagpdf/tagpdf-checks-code.sty
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+\ProvidesExplPackage {tagpdf-checks-code} {2018/07/04} {0.1}
+ {part of tagpdf - code related to checks and messages}
+
+
+%messages
+
+% mc
+\msg_new:nnn { tagpdf } { mc-nested } { nested~marked~content~found~-~mcid~#1 }
+\msg_new:nnn { tagpdf } { mc-tag-missing } { required~tag~missing~-~mcid~#1 }
+\msg_new:nnn { tagpdf } { mc-label-unknown }{ label~#1~unknown~-~rerun }
+\msg_new:nnn { tagpdf } { mc-used-twice } { mc~#1~has~been~already~used }
+\msg_new:nnn { tagpdf } { mc-not-open } { there~is~no~mc~to~end~at~#1 }
+
+% structures
+\msg_new:nnn { tagpdf } { struct-no-objnum } { objnum~missing~for~structure~#1 }
+\msg_new:nnn { tagpdf } { struct-faulty-nesting } { there~is~no~open~structure~on~the~stack }
+\msg_new:nnn { tagpdf } { struct-missing-tag } { a~structure~must~have~a~tag! }
+\msg_new:nnn { tagpdf } { struct-show-closing } { closing~structure~#1~tagged~\prop_item:cn{g__uftag_struct_#1_prop}{S} }
+\msg_new:nnn { tagpdf } { struct-used-twice} { structure~with~label~#1~has~already~been~used}
+\msg_new:nnn { tagpdf } { struct-label-unknown} { structure~with~label~#1~is~unknown~rerun}
+
+
+%Roles
+\msg_new:nnn { tagpdf } { role-missing } { tag~#1~has~no~role~assigned }
+\msg_new:nnn { tagpdf } { role-unknown } { role~#1~is~not~known }
+\msg_new:nnn { tagpdf } { role-unknown-tag } { tag~#1~is~not~known }
+\msg_new:nnn { tagpdf } { role-new-tag } { adding~new~tag~#1~mapped~to~role~#2 }
+
+
+% trees
+\msg_new:nnn { tagpdf } {tree-mcid-index-wrong } {something~is~wrong~with~the~mcid}
+
+% obj
+\msg_new:nnn { tagpdf } {obj-write-num } {write~obj~#1~to~pdf}
+
+
+%checks
+%structures
+
+\cs_new:Nn \__uftag_check_structure_has_tag:n %#1 struct num
+ {
+ \prop_if_in:cnF { g__uftag_struct_#1_prop }
+ {S}
+ {
+ \msg_error:nn { tagpdf }{ struct-missing-tag }
+ }
+ }
+
+\cs_new:Nn \__uftag_check_info_closing_struct:n %#1 struct num
+ {
+ \msg_info:nnn {tagpdf}{struct-show-closing}{#1}
+ }
+
+\cs_generate_variant:Nn \__uftag_check_info_closing_struct:n {o,x}
+
+\cs_new:Nn \__uftag_check_no_open_struck:
+ {
+ \msg_error:nn {tagpdf}{ struct-faulty-nesting }
+ }
+
+\cs_new:Nn \__uftag_check_struct_used:n %#1 label
+ {
+ \prop_get:cnNT
+ {g__uftag_struct_\zref@extractdefault{tagpdfstruct-#1}{tagstruct}{unknown}_prop}
+ {P}
+ \l_tmpa_tl
+ {\msg_warning:nnn {tagpdf}{struct-used-twice}{#1}}
+ }
+
+%roles
+
+\cs_new:Nn \__uftag_check_add_tag_role:nn %#1 tag, #2 role
+ {
+ \tl_if_empty:nTF { #2 }
+ {
+ \msg_warning:nnn { tagpdf }{ role-missing } { #1 }
+ }
+ {
+ \prop_get:NnNF \g__uftag_role_tags_prop { #2 } \l_tmpa_tl
+ {
+ \msg_warning:nnn { tagpdf }{ role-unknown } { #2 }
+ }
+ {
+ \msg_info:nnnn { tagpdf }{ role-new-tag } { #1 }{ #2 }
+ }
+ }
+ }
+
+%mc
+\cs_new:Nn \__uftag_check_mc_if_nested:
+ {
+ \_uftag_mc_if_in:T
+ {
+ \msg_warning:nnx {tagpdf}{mc-nested}{ \__uftag_get_mc_abs_cnt: }
+ }
+ }
+
+\cs_new:Nn \__uftag_check_mc_if_open:
+ {
+ \_uftag_mc_if_in:F
+ {
+ \msg_warning:nnx {tagpdf}{mc-not-open}{ \__uftag_get_mc_abs_cnt: }
+ }
+ }
+
+\cs_new:Nn \__uftag_check_mc_tag:N
+ {
+ \tl_if_empty:NT #1
+ {
+ \msg_error:nnx {tagpdf}{mc-tag-missing}{ \__uftag_get_mc_abs_cnt: }
+ }
+ \prop_if_in:NoF \g__uftag_role_tags_prop { #1 }
+ {
+ \msg_warning:nnx {tagpdf}{role-unknown-tag} { #1 }
+ }
+ }
+
+\seq_new:N \g__uftag_check_mc_used_seq
+\cs_new:Nn \__uftag_check_mc_used:n
+ {
+ \seq_if_in:NnTF \g__uftag_check_mc_used_seq { #1 }
+ {
+ \msg_warning:nnn {tagpdf}{mc-used-twice}{ #1 }
+ }
+ {
+ \seq_gput_right:Nx\g__uftag_check_mc_used_seq { #1 }
+ }
+ }
+
+
+
+\cs_new:Nn \__uftag_check_show_MCID_by_page:
+ {
+ \tl_set:Nx \l__uftag_tmpa_tl
+ {
+ \zref@extractdefault
+ {LastPage} {abspage} {-1}
+ }
+ \int_step_inline:nnnn {1}{1}
+ {
+ \l__uftag_tmpa_tl
+ }
+ {
+ \seq_clear:N \l_tmpa_seq
+ \int_step_inline:nnnn {1}{1}
+ {
+ \zref@extractdefault
+ {LastPage} {tagmcabs} {-1}
+ }
+ {
+ \int_compare:nT
+ {
+ \zref@extractdefault
+ {mcid-####1} {tagabspage} {-1}
+ = ##1
+ }
+ {
+ \seq_gput_right:Nx \l_tmpa_seq
+ {
+ Page##1-####1-\zref@extractdefault
+ {mcid-####1} {tagmcid} {-1}
+ }
+ }
+ }
+ \seq_show:N \l_tmpa_seq
+ }
+ }
+
+\cs_new:Nn\__uftag_check_record_pdfobj_num:n
+ {
+ \int_compare:nT {\l__uftag_loglevel_int >= 3 }
+ {
+ \msg_info:nnx { tagpdf }{obj-write-num}{#1}
+ }
+ }
+
+\endinput