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diff --git a/macros/latex/contrib/tagpdf/tagpdf-checks-code.sty b/macros/latex/contrib/tagpdf/tagpdf-checks-code.sty
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+\ProvidesExplPackage {tagpdf-checks-code} {2019/07/02} {0.61}
+ {part of tagpdf - code related to checks and messages}
+
+
+%messages
+
+% mc
+\msg_new:nnn {uftag} {mc-nested} { nested~marked~content~found~-~mcid~#1 }
+\msg_new:nnn {uftag} {mc-tag-missing} { required~tag~missing~-~mcid~#1 }
+\msg_new:nnn {uftag} {mc-label-unknown} { label~#1~unknown~-~rerun }
+\msg_new:nnn {uftag} {mc-used-twice} { mc~#1~has~been~already~used }
+\msg_new:nnn {uftag} {mc-not-open} { there~is~no~mc~to~end~at~#1 }
+
+% structures
+\msg_new:nnn {uftag} {struct-no-objnum} { objnum~missing~for~structure~#1 }
+\msg_new:nnn {uftag} {struct-faulty-nesting} { there~is~no~open~structure~on~the~stack }
+\msg_new:nnn {uftag} {struct-missing-tag} { a~structure~must~have~a~tag! }
+\msg_new:nnn {uftag} {struct-show-closing} { closing~structure~#1~tagged~\prop_item:cn{g__uftag_struct_#1_prop}{S} }
+\msg_new:nnn {uftag} {struct-used-twice} { structure~with~label~#1~has~already~been~used}
+\msg_new:nnn {uftag} {struct-label-unknown} { structure~with~label~#1~is~unknown~rerun}
+
+% attributes
+\msg_new:nnn {uftag} {attr-unknown} { attribute~#1~is~unknown}
+
+
+%Roles
+\msg_new:nnn {uftag} {role-missing} { tag~#1~has~no~role~assigned }
+\msg_new:nnn {uftag} {role-unknown} { role~#1~is~not~known }
+\msg_new:nnn {uftag} {role-unknown-tag} { tag~#1~is~not~known }
+\msg_new:nnn {uftag} {role-new-tag} { adding~new~tag~#1~mapped~to~role~#2 }
+
+
+% trees
+\msg_new:nnn {uftag} {tree-mcid-index-wrong} {something~is~wrong~with~the~mcid}
+
+% obj
+\msg_new:nnn {uftag} {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 {uftag} {struct-missing-tag}
+ }
+ }
+
+\cs_new:Nn \__uftag_check_structure_tag:N
+ {
+ \prop_if_in:NoF \g__uftag_role_tags_prop {#1}
+ {
+ \msg_warning:nnx {uftag} {role-unknown-tag} {#1}
+ }
+ }
+
+\cs_new:Nn \__uftag_check_info_closing_struct:n %#1 struct num
+ {
+ \msg_info:nnn {uftag} {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 {uftag} {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 {uftag} {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 {uftag} {role-missing} {#1}
+ }
+ {
+ \prop_get:NnNF \g__uftag_role_tags_prop {#2} \l_tmpa_tl
+ {
+ \msg_warning:nnn {uftag} {role-unknown} {#2}
+ }
+ {
+ \msg_info:nnnn {uftag} {role-new-tag} {#1} {#2}
+ }
+ }
+ }
+
+%mc
+\cs_new:Nn \__uftag_check_mc_if_nested:
+ {
+ \__uftag_mc_if_in:T
+ {
+ \msg_warning:nnx {uftag} {mc-nested} { \__uftag_get_mc_abs_cnt: }
+ }
+ }
+
+\cs_new:Nn \__uftag_check_mc_if_open:
+ {
+ \__uftag_mc_if_in:F
+ {
+ \msg_warning:nnx {uftag} {mc-not-open} { \__uftag_get_mc_abs_cnt: }
+ }
+ }
+
+\cs_new:Nn \__uftag_check_mc_tag:N
+ {
+ \tl_if_empty:NT #1
+ {
+ \msg_error:nnx {uftag} {mc-tag-missing} { \__uftag_get_mc_abs_cnt: }
+ }
+ \prop_if_in:NoF \g__uftag_role_tags_prop {#1}
+ {
+ \msg_warning:nnx {uftag} {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 {uftag} {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 {uftag} {obj-write-num} {#1}
+ }
+ }
+
+\endinput