Cases

<..plain,latex mathml ..>+

\Configure{cases}
     {}{} {\HCode{<PARA><mtable>}}{\HCode{</mtable></PARA>}}
     {\Tg<mtr>}{\Tg</mtr>}
     {\Tg<mtd class="cases">}{\Tg</mtd>}

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<..configure jsml-math amsmath ..>+

\ConfigureEnv{cases}
    {<.advance table number .>%
     <.new row counter .>%
     \HCode{<div class="cases">}%
     \bgroup
        <.save left/right config .>%
        <.config amsmath cases .>%
        <.cases left/right .>%
    }
    {\egroup\HCode{</div>}%
     <.return to prev row counter .>%
     <.return to prev table number .>}
    {}{}

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<..config amsmath cases ..>

\Configure{array}
    {\HCode{<mtable class="cases">%
            <.start cases note .>}} %
    {\Tag{cases-\TableNo}{\HRow}%
     \HCode{<.show input line no .>%
            <.end cases note .>}%
     \ifvmode \IgnorePar\fi \Tg</mtable>}
    {\HCode{<mtr>%
            <.next case note .>}}
    {\HCode{</mtr>}}%
    {\HCode{<mtd  class="sub-case-\HCol" >%
            <BREAK SIZE="\ifnum \HCol>1 medium\else
                                         small\fi"/>}%
     \bgroup
        <.config array .>%
        <.recall left/right config .>%
    }
    {\egroup \HCode{</mtd>\Hnewline}}

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<..start cases note ..>

\add:vdescription{begin-array}{<BREAK SIZE="small"/>begin
\ifTag{cases-\TableNo}{\LikeRef{cases-\TableNo}}{}
cases<BREAK SIZE="small"/>}%

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<..end cases note ..>

\add:vdescription{end-array}
{<BREAK SIZE="small"/>end cases<BREAK SIZE="small"/>}

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<..next case note ..>

\add:vdescription{begin-end}
{<BREAK SIZE="small"/><.ord row .> case}%

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<..cases left/right ..>

\Configure{left}
    {}
    {\bgroup}
\Configure{right}
    {\egroup}
    {}

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<..save left/right config ..>

\let\sv:a:left=\a:left
\let\sv:b:left=\b:left
\let\sv:a:right=\a:right
\let\sv:b:right=\b:right

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<..recall left/right config ..>

\let\a:left=\sv:a:left
\let\b:left=\sv:b:left
\let\a:right=\sv:a:right
\let\b:right=\sv:b:right

-_-_-

2.4 Cases