416 lines
8.3 KiB
TeX
416 lines
8.3 KiB
TeX
\ProvidesExplPackage {luamml-patches-amsmath} {2021-04-23} {0.0.1-alpha}
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{Feel free to add a description here}
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\lua_now:n { require'luamml-amsmath' }
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% For all of these changes, the redefinitions appear huge.
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% But they are almost identical to the original and only
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% add luamml commands in appropriate places, so they would
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% mostly disappear if there were enough hooks in amsmath.
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% aligned and friends
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\cs_set:Npn \start@aligned #1#2 {
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\RIfM@
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\else
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\nonmatherr@ { \begin { \@currenvir } }
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\fi
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\savecolumn@ % Assumption: called inside a group
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\luamml_annotate:en {
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core = false
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} {
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\alignedspace@left
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}
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\ams@start@box {#1} \bgroup
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\maxfields@ #2 \relax
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\ifnum \maxfields@ > \m@ne
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\multiply \maxfields@ \tw@
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\let \math@cr@@@ \math@cr@@@alignedat
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\alignsep@ \z@skip
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\else
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\let \math@cr@@@ \math@cr@@@aligned
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\alignsep@ \minalignsep
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\fi
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\Let@ \chardef \dspbrk@context \@ne
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\default@tag
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\spread@equation % no-op if already called
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\global \column@ \z@
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\ialign \bgroup
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& \column@plus
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\hfil
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\strut@
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$
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\m@th
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\displaystyle
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{##}
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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$
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\__luamml_amsmath_add_last_to_row:
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\tabskip \z@skip
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& \column@plus
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$
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\m@th
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\displaystyle
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{
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{}
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##
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}
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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$
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\__luamml_amsmath_add_last_to_row:
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\hfil
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\tabskip\alignsep@
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\crcr
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\ams@return@opt@arg
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}
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\renewcommand \gathered [1] [c] {
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\RIfM@
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\else
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\nonmatherr@ { \begin {gathered} }
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\fi
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\luamml_annotate:en {
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core = false
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} {
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\alignedspace@left
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}
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\ams@start@box {#1} \bgroup
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\Let@
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\chardef \dspbrk@context \@ne
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\restore@math@cr
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\spread@equation
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\ialign \bgroup
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\hfil
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\strut@
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$
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\m@th
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\displaystyle
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##
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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$
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\__luamml_amsmath_add_last_to_row:
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\hfil
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\crcr
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\ams@return@opt@arg
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}
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\cs_set:Npn \endaligned {
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\crcr
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\__luamml_amsmath_save_inner_table:n \@currenvir
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\egroup
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\restorecolumn@
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\egroup
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\__luamml_amsmath_finalize_inner_table:
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}
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% gather
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\cs_set:Npn \gather@ #1 {
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\ingather@true
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\let \split \insplit@
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\let \tag \tag@in@align
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\let \label \label@in@display
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\chardef \dspbrk@context \z@
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\intertext@ \displ@y@ \Let@
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\let \math@cr@@@ \math@cr@@@gather
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\gmeasure@ {#1}
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\global \shifttag@false
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\tabskip \z@skip
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\global \row@ \@ne
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\halign to \displaywidth \bgroup
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\strut@
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\setboxz@h {
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$
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\m@th
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\displaystyle
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{##}
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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$
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}
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\__luamml_amsmath_add_box_to_row:
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\calc@shift@gather
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\set@gather@field
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\tabskip\@centering
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&
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\setboxz@h {
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\strut@
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{##}
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}
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\dim_compare:nNnF {0pt} = {
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\box_wd:N \c_zero_int
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} {
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\__luamml_amsmath_set_tag:
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}
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\place@tag@gather
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\tabskip \iftagsleft@
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\gdisplaywidth@
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\else
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\z@skip
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\span \fi
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\crcr
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#1
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}
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\cs_new_eq:NN \__luamml_amsmath_original_gmeasure:n \gmeasure@
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\cs_set:Npn \gmeasure@ #1 {
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\exp_last_unbraced:Nno
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\use_ii_i:nn
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{ \luamml_flag_ignore: }
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{ \__luamml_amsmath_original_gmeasure:n {#1} }
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}
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\cs_set:Npn \endgather {
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\math@cr
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\black@ \totwidth@
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\__luamml_amsmath_finalize_table:n {gather}
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\egroup
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$$
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\ignorespacesafterend
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}
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% align and friends
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\cs_set:Npn \align@preamble {
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&
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\hfil
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\strut@
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\setboxz@h {
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\@lign
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$
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\m@th
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\displaystyle
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{##}
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\ifmeasuring@
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\luamml_flag_ignore:
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\else
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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\fi
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$
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}
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\ifmeasuring@
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\savefieldlength@
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\else
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\__luamml_amsmath_add_box_to_row:
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\fi
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\set@field
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\tabskip\z@skip
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&
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\setboxz@h {
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\@lign
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$
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\m@th
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\displaystyle
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{
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{}
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##
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}
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\ifmeasuring@
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\luamml_flag_ignore:
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\else
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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\fi
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$
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}
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\ifmeasuring@
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\savefieldlength@
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\else
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\__luamml_amsmath_add_box_to_row:
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\fi
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\set@field
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\hfil
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\tabskip\alignsep@
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}
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\cs_set:Npn \math@cr@@@align {
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\ifst@rred
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\nonumber
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\fi
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\if@eqnsw
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\global \tag@true
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\fi
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\global \advance \row@ \@ne
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\add@amps \maxfields@
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\omit
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\kern -\alignsep@
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\iftag@
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\setboxz@h {
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\@lign
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\strut@
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{ \make@display@tag }
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}
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\place@tag
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\__luamml_amsmath_set_tag:
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\fi
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\ifst@rred
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\else
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\global \@eqnswtrue
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\fi
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\global \lineht@ \z@
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\cr
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}
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\cs_set:Npn \maketag@@@ #1 {
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\hbox {
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\m@th
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\normalfont
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#1
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\__luamml_amsmath_save_tag:
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}
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}
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\cs_set:Npn \endalign {
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\math@cr
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\black@ \totwidth@
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\__luamml_amsmath_finalize_table:n {align}
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\egroup
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\ifingather@
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\restorealignstate@
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\egroup
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\nonumber
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\ifnum0=‘{\fi\iffalse}\fi
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\else
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$$
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\fi
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\ignorespacesafterend
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}
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% For a more interesting one, let's consider multline:
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\cs_new_eq:NN \__luamml_amsmath_original_multline:n \multline@
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\cs_set:Npn \multline@ #1 {
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\__luamml_amsmath_original_multline:n {
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\ifmeasuring@ \else
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\__luamml_amsmath_set_row_columnalign:n {left}
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\fi
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#1
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\ifmeasuring@ \else
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\__luamml_amsmath_set_row_columnalign:n {right}
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\fi
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}
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}
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\cs_new_eq:NN \__luamml_amsmath_original_mmeasure:n \mmeasure@
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\cs_set:Npn \mmeasure@ #1 {
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\exp_last_unbraced:Nno
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\use_ii_i:nn
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{ \luamml_flag_ignore: }
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{ \__luamml_amsmath_original_mmeasure:n {#1} }
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}
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% Luckily, {multline} uses \endmultline@math in exactly
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% the spot where we have to set the flag.
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% Less luckily, \endmultline@math sometimes get overwritten for the last line.
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% But that isn't a problem since we want special behavior there anyway.
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\cs_set:Npn \endmultline@math {
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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$
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\__luamml_amsmath_add_last_to_row:
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}
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\cs_set:Npn \rendmultline@ {
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\iftag@
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\luamml_flag_save:nNn {} \displaystyle {mtd}
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$
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\__luamml_amsmath_add_last_to_row:
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\let \endmultline@math \relax
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\ifshifttag@
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\hskip \multlinegap
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\llap {
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\vtop {
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\raise@tag
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\normalbaselines
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\setbox \@ne \null
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\dp \@ne \lineht@
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\box \@ne
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\hbox {
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\strut@
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\make@display@tag
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}
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}
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}
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\else
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\hskip \multlinetaggap
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\make@display@tag
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\fi
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\__luamml_amsmath_set_tag:
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\else
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\hskip \multlinegap
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\fi
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\hfilneg
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\math@cr
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\__luamml_amsmath_finalize_table:n {multline}
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\egroup
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$$
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}
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\cs_set:Npn \lendmultline@ {
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\hfilneg
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\hskip\multlinegap
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\math@cr
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\__luamml_amsmath_finalize_table:n {multline}
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\egroup
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$$
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}
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% Finally some slightly different stuff.
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% While {matrix} is covered by {array}, we still have {smallmatrix}:
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\renewenvironment {smallmatrix} {
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\luamml_annotate:en {
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core = false
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} {
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\null
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\,
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}
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\vcenter \bgroup
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\Let@
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\restore@math@cr
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\default@tag
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\baselineskip 6 \ex@
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\lineskip 1.5 \ex@
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\lineskiplimit \lineskip
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\ialign \bgroup
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\hfil
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$
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\m@th
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\scriptstyle
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##
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\luamml_flag_save:nn {} {mtd} % No \scriptsize here since we want to add the mstyle nodes
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$
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\__luamml_amsmath_add_last_to_row:
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\hfil
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&&
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\thickspace
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\hfil
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$
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\m@th
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\scriptstyle
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##
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\luamml_flag_save:nn {} {mtd} % No \scriptsize here since we want to add the mstyle nodes
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$
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\__luamml_amsmath_add_last_to_row:
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\hfil
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\crcr
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}{%
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\crcr
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\__luamml_amsmath_save_smallmatrix:
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\egroup
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\egroup
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\__luamml_amsmath_finalize_inner_table:
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\luamml_annotate:en {
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core = false
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} {
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\,
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}
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}
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\cs_set:Npn \bBigg@ #1 #2 {
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{
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\ensuremath {
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\Uvextensible height~#1 \big@size axis~exact~#2
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}
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}
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}
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\cs_set:Npn \env@cases {
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\let \@ifnextchar \new@ifnextchar
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\left \lbrace
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\def \arraystretch {1.2}
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\array {@{}l@{\quad \luamml_flag_ignore:}l@{}}
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}
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