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\ifx\DOLINES\relax\endinput\else\let\DOLINES=\relax\fi % \input only once
%
% dolines.tex: Meta-macros to separate arguments by newlines and by
% empty lines.
% version: 1.0 release: 15 April 1991
%
% copyright (c) 1991 Marcel R. van der Goot
% You can use these macros to typeset documents. You may
% distribute this file freely, provided that you also distribute
% the accompanying documentation.
% You may make changes to this file, or extract portions
% of it for inclusion in other files, provided that
% (1) you change the name of the file;
% (2) you give proper credit and include copyright
% information where applicable;
% (3) explain how an unchanged version can be obtained; and
% (4) document the usage of your macros/changes (if usage
% of your macros is not worth documenting, they must not
% be worth using).
% You are not allowed to use the name ``Midnight Macros'' for
% any changed files.
% The above rules for making changes do not apply where it
% is explicitly noted in this file that something can be changed
% to conform to your local installation.
%
% USAGE:
% See the file dolines.doc
% You need Midnight/loop.tex to use these macros.
%
% original: csvax.cs.caltech.edu [131.215.131.131] in pub/tex
% (use anonymous ftp). Also in various archives.
%
% Caltech, Pasadena --- Marcel van der Goot
% marcel@cs.caltech.edu
% Caltech 256--80
% Pasadena, CA 91125
% USA
% (818) 356--4603
%
% update history:
% version 1.0: This one.
% release 15 April 1991: This one.
% release 8 February 1991: Used \next instead of \do_next, which
% occasionally conflicted with use of \next in other macros.
%%%%%% CODE: (you don't need to read this to use the macros)
\input Midnight/loop % CHANGE this filename to correspond to your installation
%%%%%%% Reading from a different file
% This is relatively simple, it can be done with a loop. The read function
% reads a single line (that is what \read does). A file that is being
% \read always ends with an empty line, therefore no test for eof(lines_in)
% is needed in the inner loop.
%
% while (!eof(lines_in))
% {
% read(lines_in, _ln);
% if (_ln != empty_ln)
% {
% beforelines();
% do { everyline(_ln);
% read(lines_in, _ln);
% } while (_ln != empty_ln);
% afterlines();
% }
% }
%
{\catcode`\^^M=12 \endlinechar=-1 % 12 = other
\catcode`\_=11 % 11 = letter (used to make macros private)
\newread\lines_in
\globaldefs=1
\def\empty_ln{\par}
\def\filedolines#1%
{{\openin\lines_in=#1 %
\ifeof\lines_in\message{File #1 not found.}\fi
\Loop\ifeof\lines_in \Break1 \fi
\read\lines_in to\_ln
\ifx\_ln\empty_ln
\else {\beforelines
\Loop\everyline{\_ln}%
\read\lines_in to\_ln
\ifx\_ln\empty_ln \Break1 \fi
\Pool
\afterlines
}%
\fi
\Pool
\closein\lines_in
}}
} % restore \catcode`\^^M, \catcode`\_, etc.
%%%%%%% Reading from the current file
% This is more complicated. The problem is that a line can only be
% read at the end of a macro, because otherwise a part of the macro
% itself will be read. Therefore, the above solution with \Loop cannot
% be used. Instead, this is implemented as a finite state machine. The
% FSM has two major states, outer_loop and inner_loop, corresponding to the
% program above. In these states, the value of _ln is used to determine
% what actions to take, and what the next state is. The next state
% is indicated by the control-sequence \do_next.
% There are two minor states, get_out and get_in. In each of them
% the next line is read into _ln. After get_out, the next state is always
% outer_loop; after get_in it is always inner_loop.
% Here is a ``picure.'' `(...)' is a state, `...?' denotes the value
% of _ln, and other texts are actions. ctrl-M stands for an empty line.
%
% /---<----\
% (get_out) |
% \ ctrl-M?
% begindolines V /
% \->bgroup -> (get_out) -> (outer_loop) -> enddolines? -> egroup
% ^ | ^ \-> (finish)
% / | \
% afterlines --/ other? \-- afterlines
% ^ V ^
% | beforelines |
% ctrl-M? <--\ | /--> enddolines?
% \ V /
% (inner_loop)
% / ^
% other? \
% | (get_in)
% V |
% \-everyline->/
%
{\catcode`\^^M=12 \endlinechar=-1 % 12 = other
\catcode`\_=11 % 11 = letter (used to make macros private)
\globaldefs=1
\long\def\get_out#1^^M% here a line is read (as #1)
{\gdef\_ln{#1}%
\outer_loop
}
\long\def\get_in#1^^M% here a line is read (as #1)
{\gdef\_ln{#1}%
\inner_loop
}
\def\outer_loop
{\ifx\_ln\enddolines \egroup\let\do_next=\finishdolines
\else\ifx\_ln\empty \let\do_next=\get_out
\else \beforelines\let\do_next=\inner_loop
\fi \fi
\do_next
}
\def\inner_loop
{\ifx\_ln\enddolines \afterlines\let\do_next=\outer_loop
\else\ifx\_ln\empty \afterlines\let\do_next=\outer_loop
\else \everyline\_ln\let\do_next=\get_in
\fi \fi
\do_next
}
\def\begindolines
{\bgroup
\catcode`\^^M=12 %
\get_out
}
} % restore \catcode`\^^M, \catcode`\_, etc.
% We define \finishdolines and \enddolines, in case someone forgets:
\let\finishdolines=\relax
\def\enddolines{\enddolines}
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