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%D \module
%D [ file=core-gen,
%D version=1995.10.10,
%D title=\CONTEXT\ Core Macros,
%D subtitle=General,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Core Macros / General}
% we could write a proper parser now in lua
\unprotect
%D \macros
%D {assigndimension,assignalfadimension}
%D
%D The following commands are used to process keyword based
%D dimension setters.
%D
%D \starttyping
%D \assigndimension
%D {<value>|small|medium|big|-small|-medium|-big|none}
%D {\dimension}
%D {value small}
%D {value medium}
%D {value big}
%D \stoptyping
%D
%D The given keyword determines the result.
\installcorenamespace{dimensionnormal}
\def\assign_dimension_direct#value#dimension#small#medium#big{#dimension=#value\relax}
\setvalue{\??dimensionnormal \v!none }#value#dimension#small#medium#big{#dimension\zeropoint}
\setvalue{\??dimensionnormal \empty }#value#dimension#small#medium#big{#dimension\zeropoint}
\setvalue{\??dimensionnormal \v!small }#value#dimension#small#medium#big{#dimension=#small\relax}
\setvalue{\??dimensionnormal \v!medium}#value#dimension#small#medium#big{#dimension=#medium\relax}
\setvalue{\??dimensionnormal \v!big }#value#dimension#small#medium#big{#dimension=#big\relax}
\setvalue{\??dimensionnormal-\v!small }#value#dimension#small#medium#big{#dimension=-#small\relax}
\setvalue{\??dimensionnormal-\v!medium}#value#dimension#small#medium#big{#dimension=-#medium\relax}
\setvalue{\??dimensionnormal-\v!big }#value#dimension#small#medium#big{#dimension=-#big\relax}
\letvalue{\??dimensionnormal\s!unknown}\assign_dimension_direct
% \protected\def\assigndimension#value%
% {\csname\??dimensionnormal\ifcsname\??dimensionnormal#value\endcsname#value\else\s!unknown\fi\endcsname{#value}}
\protected\def\assigndimension#value%
{\ifcsname\??dimensionnormal#value\endcsname
\expandafter\lastnamedcs
\else
\expandafter\assign_dimension_direct
\fi{#value}}
%D The next variant assigns to a macro instead of a dimension.
%D
%D \starttyping
%D \assignalfadimension
%D {<value>|small|medium|big|none}
%D {\macro}
%D {value small}
%D {value medium}
%D {value big}
%D \stoptyping
%D
%D This one is used for factors.
\installcorenamespace{dimensionalfa}
\def\assign_alpha_dimension_direct#value#macro#small#medium#big{\edef#macro{#value}}
\setvalue{\??dimensionalfa\v!none }#value#macro#small#medium#big{\let #macro\!!zerocount}
\setvalue{\??dimensionalfa\v!small }#value#macro#small#medium#big{\edef#macro{#small}}
\setvalue{\??dimensionalfa\v!medium }#value#macro#small#medium#big{\edef#macro{#medium}}
\setvalue{\??dimensionalfa\v!big }#value#macro#small#medium#big{\edef#macro{#big}}
\letvalue{\??dimensionalfa\s!unknown}\assign_alpha_dimension_direct
% \protected\def\assignalfadimension#value%
% {\csname\??dimensionalfa\ifcsname\??dimensionalfa#value\endcsname#value\else\s!unknown\fi\endcsname{#value}}
\protected\def\assignalfadimension#value%
{\ifcsname\??dimensionalfa#value\endcsname
\expandafter\lastnamedcs
\else
\expandafter\assign_alpha_dimension_direct
\fi
{#value}}
%D \macros
%D {assignvalue}
%D
%D A variant that does not assume dimenions ios the following:
%D
%D \starttyping
%D \assignvalue
%D {<value>|small|medium|big}
%D {\macro}
%D {value small}
%D {value medium}
%D {value big}
%D \stoptyping
\installcorenamespace{dimensionvalue}
\def\assign_value_direct#value#macro#small#medium#big{\edef#macro{#value}}
\setvalue{\??dimensionvalue\v!small }#value#macro#small#medium#big{\edef#macro{#small}}
\setvalue{\??dimensionvalue\v!medium }#value#macro#small#medium#big{\edef#macro{#medium}}
\setvalue{\??dimensionvalue\v!big }#value#macro#small#medium#big{\edef#macro{#big}}
\letvalue{\??dimensionvalue\s!unknown}\assign_value_direct
% \protected\def\assignvalue#value%
% {\csname\??dimensionvalue\ifcsname\??dimensionvalue#value\endcsname#value\else\s!unknown\fi\endcsname{#value}}
\protected\def\assignvalue#value%
{\ifcsname\??dimensionvalue#value\endcsname
\expandafter\lastnamedcs
\else
\expandafter\assign_value_direct
\fi{#value}}
%D \macros
%D {assignwidth}
%D
%D Een breedte van een opgegeven tekst kan worden berekend en
%D toegekend aan een \DIMENSION\ met:
%D
%D \starttyping
%D \assignwidth
%D {<value>|fit|broad}
%D {\dimension}
%D {text}
%D {extra}
%D \stoptyping
\installcorenamespace{dimensionwidth}
\newbox\b_assign_width
\def\assign_width_direct#value#dimension#content#extra{#dimension=#value\relax}
% line is like fit but can be used later as signal for ...
\setvalue{\??dimensionwidth }#value#dimension#content#extra{\setbox\b_assign_width\hbox{#content}#dimension\wd\b_assign_width
\setbox\b_assign_width\emptybox}
\setvalue{\??dimensionwidth\v!fit }#value#dimension#content#extra{\setbox\b_assign_width\hbox{#content}#dimension\wd\b_assign_width
\setbox\b_assign_width\emptybox}
\setvalue{\??dimensionwidth\v!broad }#value#dimension#content#extra{\setbox\b_assign_width\hbox{#content}#dimension\dimexpr\wd\b_assign_width+#extra\relax
\setbox\b_assign_width\emptybox}
\setvalue{\??dimensionwidth\v!line }#value#dimension#content#extra{\setbox\b_assign_width\hbox{#content}#dimension\wd\b_assign_width
\setbox\b_assign_width\emptybox}
\letvalue{\??dimensionwidth\s!unknown}\assign_width_direct
% \protected\def\assignwidth#value%
% {\csname\??dimensionwidth\ifcsname\??dimensionwidth#value\endcsname#value\else\s!unknown\fi\endcsname{#value}}
\protected\def\assignwidth#value%
{\ifcsname\??dimensionwidth#value\endcsname
\expandafter\lastnamedcs
\else
\expandafter\assign_width_direct
\fi{#value}}
\protect \endinput
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