mwe.log

This is XeTeX, Version 3.1415926-2.5-0.9999.3 (TeX Live 2013) (format=xelatex 2013.9.7)  24 DEC 2013 17:29
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**\input mwe.tex
(./mwe.tex

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LaTeX Warning: Unused global option(s):
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*************************************************
* cs-smp warning: "page-length"
* 
* Your paper doesn't meet the given page limits.
*************************************************
[41] (./mwe.aux) ) 
Here is how much of TeX's memory you used:
 6283 strings out of 493934
 114994 string characters out of 6148804
 246878 words of memory out of 5000000
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 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1144 hyphenation exceptions out of 8191
 37i,5n,37p,272b,107s stack positions out of 5000i,500n,10000p,200000b,80000s

Output written on mwe.pdf (41 pages).

mwe.tex

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\ProvidesExplClass
{cs-smp}
{2013/12/23}
{1.0}
{A class for St. Mary's Projects in Computer Science}

\ExplSyntaxOn

\keys_define:nn { cs-smp } 
  {
    minp .int_set:N = \g_cssmp_page_min_int,
    minp .default:n = 0,
    maxp .int_set:N = \g_cssmp_page_max_int,
    maxp .default:n = 9999,
    default .code:n = \msg_info:nnn { cs-smp } { unknown-option } { #1 }
  }


\PassOptionsToClass{letterpaper}{article}

\ProcessKeysOptions { cs-smp }

\LoadClassWithOptions{article}

\RequirePackage[log-declarations=false]{xparse}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Messages %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\msg_new:nnnn { cs-smp } { page-length } {
  Your ~ paper ~ doesn't ~ meet ~ the ~ given ~ page ~ limits.
} {
  This ~ paper ~ was ~ set ~ with ~ the ~ following ~ bounds:
   ~  ~ Minimum: ~ #1
   ~  ~ Maximum: ~ #2
  Your ~ paper ~ only ~ has ~ #3 ~ pages.
}

\msg_new:nnnn { cs-smp } { unknown-option } {
  I ~ don't ~ know ~ the ~ option ~ `#1`.
} {
  I'm ~ passing ~ it ~ along ~ to ~ the ~ document ~ class.
}

\msg_new:nnnn { cs-smp} { invalid-bounds } {
  Invalid ~ page ~ bounds.
} {
  The ~ minimum ~ cannot ~ be ~ greater ~ than ~ the ~ maximum.
   ~  ~ Minimum: ~ #1
   ~  ~ Maximum: ~ #2
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Private Functions %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Ensure that min <= max
\cs_new:Nn \cssmp_validate_bounds: {
  \int_compare:nNnT { \g_cssmp_page_min_int } > { \g_cssmp_page_max_int }
    {
      \msg_error:nnnn { cs-smp } { invalid-bounds }
        { \g_cssmp_page_min_int }
        { \g_cssmp_page_max_int }
    }
}

\AtBeginDocument{
  \cssmp_validate_bounds:
}

\AtEndDocument{
  \bool_if:nT
  {
    % If we are under the minimum
    \int_compare_p:nNn { \thepage } < { \g_cssmp_page_min_int }
    ||                          % or over the maximum
    \int_compare_p:nNn { \g_cssmp_page_max_int } < { \thepage }
  } {                           % issue a warning
    \msg_warning:nnnnn { cs-smp } { page-length } { \g_cssmp_page_min_int }
                                                  { \g_cssmp_page_max_int }
                                                  { \thepage }
  }
}

\NewDocumentCommand \CSSMPSetup { m } {
  \keys_set:nn { cs-smp } { #1 }
  \cssmp_validate_bounds:
}

\ExplSyntaxOff
\end{filecontents*}

\documentclass[minp=25,maxp=30,draft]{cs-smp}[2013/12/23]

\usepackage{mwe}
\begin{document}

\def\l{\lipsum\lipsum\lipsum\lipsum\lipsum\lipsum\lipsum\lipsum\lipsum\lipsum}
\l                            % under
\l                            % within
\l                            % over

\end{document}

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