92 lines
2.6 KiB
TeX
92 lines
2.6 KiB
TeX
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% Defines a new problem.
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% See problem definition files for usage examples.
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\long\def\problemdef#1#2#3{
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\ifcsname#1:problem:#2\endcsname
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\PackageError{Problem Sets}{Problem #1:#2 is already defined}{}
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\fi
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% Use a group to limit scope of special commands.
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\begingroup
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% \gdef = \global\def
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% This makes problem definitions global, and not restricted to this group.
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%
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% ##1: used to define parametrized macros in a parametrized macro.
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% When \problemdef is expanded, ##1 becomes #1.
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%
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% \long\def: like \def, but allows multi-paragraph arguments
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% \def\name#1{def: #1}: define a macro \name with one arg. TeX primitive.
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%
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% We don't use \newcommand or \renewcommand here because they will fail if
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% a macro is defined/not defined. \def will always work, defining a new name
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% in this group, temporarily redefining existing commands.
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%
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% \expandafter <macro> <tokens>
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% \expandafter command delays expanding a macro until its arguments have been expanded.
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\long\def\difficulty##1{\expandafter\gdef\csname#1:difficulty:#2\endcsname{##1}}
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\long\def\statement##1{\expandafter\gdef\csname#1:problem:#2\endcsname{##1}}
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\long\def\solution##1{\expandafter\gdef\csname#1:solution:#2\endcsname{##1}}
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\long\def\answer##1{\expandafter\gdef\csname#1:answer:#2\endcsname{##1}}
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#3
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\endgroup
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\ifcsname#1:all\endcsname
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\expandafter\edef\csname#1:all\endcsname{\csname#1:all\endcsname \p{#1}{#2}}
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\else
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\expandafter\gdef\csname#1:all\endcsname{
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\p{#1}{#2}
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}
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\fi
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}
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% Gets problem data.
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% Arguments:
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% #1: Category
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% #2: Problem id
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% #3: Field to get
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\NewDocumentCommand{\get}{ m m m }{%
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\ifcsname#1:#3:#2\endcsname%
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\csname#1:#3:#2\endcsname%
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\else%
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\PackageError{Problem Sets}{Problem #1:#2 is not defined}{}
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\fi%
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}
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\NewDocumentCommand{\getdifficulty}{ m m }{\get{#1}{#2}{difficulty}}
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\NewDocumentCommand{\getproblem}{ m m }{\get{#1}{#2}{problem}}
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% #1: Category
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% #2: Problem id
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% #3: Show if this problem has an answer
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% #4: Show if this problem doesn't have an answer
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\NewDocumentCommand{\ifanswer}{ m m m d[] }{%
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\ifcsname#1:answer:#2\endcsname%
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#3%
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\else%
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\IfNoValueF{#4}{#4}%
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\fi%
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}
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\NewDocumentCommand{\ifsolution}{ m m m d[] }{
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\ifcsname#1:solution:#2\endcsname%
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#3%
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\else%
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\IfNoValueF{#4}{#4}%
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\fi%
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}
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\NewDocumentCommand{\getanswer}{ m m }{%
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\ifanswer{#1}{#2}{\get{#1}{#2}{answer}}%
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[\PackageError{Problem Sets}{Problem #1:#2 has no answer}{}]%
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}
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\NewDocumentCommand{\getsolution}{ m m }{
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\ifsolution{#1}{#2}{\get{#1}{#2}{solution}}%
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[\PackageError{Problem Sets}{Problem #1:#2 has no solution}{}]%
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}
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\input{problems/numbertheory}
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\input{problems/algebra}
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\input{problems/combinatorics}
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\input{problems/pidgeonhole}
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