latexml 0.8.1-1 / usr / share / perl5 / LaTeXML / Package / cancel.sty.ltxml

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# -*- mode: Perl -*-
# /=====================================================================\ #
# |  cancel                                                             | #
# | Implementation for LaTeXML                                          | #
# |=====================================================================| #
# | Part of LaTeXML:                                                    | #
# |  Public domain software, produced as part of work done by the       | #
# |  United States Government & not subject to copyright in the US.     | #
# |---------------------------------------------------------------------| #
# | Bruce Miller <bruce.miller@nist.gov>                        #_#     | #
# | http://dlmf.nist.gov/LaTeXML/                              (o o)    | #
# \=========================================================ooo==U==ooo=/ #
package LaTeXML::Package::Pool;
use strict;
use warnings;
use LaTeXML::Package;

#======================================================================
# Ignore them all, for the moment.
foreach my $option (qw(samesize smaller Smaller makeroom overlap thicklines)) {
  DeclareOption($option, undef); }

#======================================================================

# The really annoying thing with \CancelColor is to
# get the strike-through done in that color,
# but have the contents be "normal" color!

# \def\CancelColor{\black} ??
DefMacro('\CancelColor', '');

sub cancelColorProperties {
  my %props = (innerfont => LookupValue('font'));
  $STATE->getStomach->bgroup;
  if (Digest(T_CS('\CancelColor'))) {
    $props{cancelfont} = LookupValue('font');
    $props{forcefont}  = 'true'; }
  $STATE->getStomach->egroup;
  return %props; }

#======================================================================
# Basic macros

# \cancel{expression}  Cancels with /
DefMacro('\cancel{}',
  '\ifmmode\@@math@cancel{#1}\else\@@text@cancel{#1}\fi');

# \bcancel{expression} Cancels with \
DefMacro('\bcancel{}',
  '\ifmmode\@@math@bcancel{#1}\else\@@text@bcancel{#1}\fi');

# \xcancel{expression} Cancels with X
DefMacro('\xcancel{}',
  '\ifmmode\@@math@xcancel{#1}\else\@@text@xcancel{#1}\fi');

#======================================================================
# Math mode
DefConstructor('\@@math@cancel{}',
  "<ltx:XMApp>"
    . "<ltx:XMTok role='ENCLOSE' enclose='updiagonalstrike' meaning='cancel'"
    . " _force_font='#forcefont' _font='#cancelfont'/>"
    . "<ltx:XMWrap>#1</ltx:XMWrap>"
    . "</ltx:XMApp>",
  alias      => '\cancel',
  properties => \&cancelColorProperties);

DefConstructor('\@@math@bcancel{}',
  "<ltx:XMApp>"
    . "<ltx:XMTok role='ENCLOSE' enclose='downdiagonalstrike' meaning='cancel'"
    . " _force_font='#forcefont' _font='#cancelfont'/>"
    . "<ltx:XMWrap>#1</ltx:XMWrap>"
    . "</ltx:XMApp>",
  alias      => '\bcancel',
  properties => \&cancelColorProperties);

DefConstructor('\@@math@xcancel{}',
  "<ltx:XMApp>"
    . "<ltx:XMTok role='ENCLOSE' enclose='updiagonalstrike downdiagonalstrike' meaning='cancel'"
    . " _force_font='#forcefont' _font='#cancelfont'/>"
    . "<ltx:XMWrap>#1</ltx:XMWrap>"
    . "</ltx:XMApp>",
  alias      => '\xcancel',
  properties => \&cancelColorProperties);

# This only works in math mode
# \cancelto{value}{expression}
# Note that the slashthrough SHOULD be an arrow!!!
# Since enclose maps to MathML's menclose notation, which is open-ended,
# we can add a not-(yet)-standard updiagnonalarrow (as suggested by Frederic Wang)
DefConstructor('\cancelto{}{}',
  "<ltx:XMApp>"
    . "<ltx:XMTok role='SUPERSCRIPTOP'/>"
    . "<ltx:XMApp>"
    . "<ltx:XMTok role='ENCLOSE' enclose='updiagonalstrike updiagonalarrow' meaning='cancel'"
    . " _force_font='#forcefont' _font='#cancelfont'/>"
    . "<ltx:XMWrap>#2</ltx:XMWrap>"
    . "</ltx:XMApp>"
    . "<ltx:XMWrap>#1</ltx:XMWrap>"
    . "</ltx:XMApp>",
  properties => \&cancelColorProperties);

#======================================================================
# This works, except that
# there isn't any CSS to create the different types of cross throughs
DefConstructor('\@@text@cancel{}',
  "<ltx:del class='downdiagonalstrike' _force_font='#forcefont' _font='#cancelfont'>"
    . "<ltx:text _noautoclose='1' _force_font='#forcefont' _font='#innerfont'>"
    . "#1"
    . "</ltx:text>"
    . "</ltx:del>",
  alias      => '\cancel',
  properties => \&cancelColorProperties);
DefConstructor('\@@text@bcancel{}',
  "<ltx:del class='updiagonalstrike' _force_font='#forcefont' _font='#cancelfont'>"
    . "<ltx:text _noautoclose='1' _force_font='#forcefont' _font='#innerfont'>"
    . "#1"
    . "</ltx:text>"
    . "</ltx:del>",
  alias      => '\bcancel',
  properties => \&cancelColorProperties);
DefConstructor('\@@text@xcancel{}',
  "<ltx:del class='downdiagonalstrike updiagonalstrike' _force_font='#forcefont' _font='#cancelfont'>"
    . "<ltx:text _noautoclose='1' _force_font='#forcefont' _font='#innerfont'>"
    . "#1"
    . "</ltx:text>"
    . "</ltx:del>",
  alias      => '\xcancel',
  properties => \&cancelColorProperties);

ProcessOptions();

1;

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