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-% Save file as: QUOTE.TEX Source: FILESERV@SHSU.BITNET
-%
-% File: QUOTE.TEX
-%
-% Author: Hunter Goatley
-% goathunter@WKUVX1.BITNET
-%
-% Date: August 14, 1991
-%
-% Abstract:
-%
-% This file defines the macros \begindoublequotes and \enddoublequotes,
-% which let TeX replace the double-quote character (") with TeX's
-% left double-quote and right double-quote. For example:
-%
-% "This is a test." ---> ``This is a test.''
-%
-% The double-quote character is still available via \dq. (\" is still
-% treated as the umlaut accent.)
-%
-% This macro makes a couple of assumptions about the double-quotes:
-%
-% 1. Double-quotes are assumed to come in pairs. When replacing
-% double-quotes, the macro alternates between `` and ''. The only
-% exception to this is noted in (2) below.
-% 2. A double-quote at the beginning of a paragraph is always treated
-% as ``. This correctly handles the case where a quotation is
-% continued into a second paragraph:
-%
-% "This is the first paragraph.\par
-% "This is the second paragraph of the same quote."
-%
-% Normal TeX spacing after `` and '' is maintained by saving and
-% restoring the \spacefactor.
-%
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%
-% HOW IT WORKS:
-%
-% The double-quote character (") is made active by \begindoublequotes.
-% The " macro keeps track of left-quote/right-quote pairs and inserts
-% the appropriate `` and '' in its place.
-%
-% Each character has a \spacefactor associated with it, which specifies
-% the amount of stretch or shrink that a space following the character
-% can have. Most characters have a factor of 1000, but some punctuation
-% marks have higher spacefactors, most notably the period, which has a
-% \spacefactor of 3000. This means the space following a period can
-% stretch up to 3 times more than the space after a regular character,
-% accounting for the increased space at the end of sentences.
-%
-% The `` and '' ligatures are assigned \spacefactor's of 0, so that the
-% \spacefactor that is applied to the next character is the same as that
-% of the character preceding the quotes. Because " has been redefined as
-% a macro, any spaces following " are swallowed by TeX. It was necessary
-% to have this macro re-insert any needed space so that the following
-% cases worked correctly:
-%
-% "This is a test," she said. --> ``This is a test,'' she said.
-% "This is in a list"; etc. --> ``This is in a list''; etc.
-%
-% Without the added space, the first example becomes:
-%
-% ``This is a test,''she said.
-%
-% The solution was to save the current \spacefactor before inserting a
-% right double-quote, then resetting the \spacefactor after the
-% insertion. The net effect was that the " macro has a \spacefactor
-% of 0, which matches the way TeX treats `` and ''.
-%
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-{% % Begin a group for which " is active
-\catcode`\"=\active % Make " an active character
-\catcode`\@=11 % Make @ an active character
-%
-% \begindoublequotes
-%
-% This macro makes " an active character, resets the control sequence
-% \dblqu@te to L (left), and defines \dq as a replacement for ".
-%
-\gdef\begindoublequotes{% % \begindoublequotes enables "
- \global\catcode`\"=\active % Make " an active character
- \global\chardef\dq=`\" % Double-quote char. via \dq
- \global\let\dblqu@te=L % Always start with a left double-quote
- } % End of macro
-%
-% Define the macro that will be executed whenever " is encountered.
-%
-\gdef"{%
- % If the double-quote is the first character in a new paragraph,
- % make sure it becomes a left double-quote. This case can be
- % detected by checking to see if TeX is currently in vertical mode.
- % If so, the double-quote is at the beginning of the paragraph
- % (since " hasn't actually generated any horizontal mode tokens
- % yet, TeX is still in vertical mode). If the mode is vertical,
- % set \dblqu@te equal to L.
- %
- \ifinner\else\ifvmode\let\dblqu@te=L\fi\fi
- %
- % Now insert the appropriate left or right double-quote.
- %
- % If \dblqu@te is L, insert a `` and set \dblqu@te to R.
- %
- \if L\dblqu@te``\global\let\dblqu@te=R%
- %
- % Otherwise, save the current \spacefactor, insert '', set \dblqu@te
- % to L, and reset the original \spacefactor.
- %
- \else
- \let\xxx=\spacefactor % Save the \spacefactor
- ''\global\let\dblqu@te=L% % Insert '' and reset \dblqu@te
- \spacefactor\xxx % Reset the \spacefactor
- \fi % End of \if L\dblqu@te...
- } % End of " macro
-} % End of group
-
-\gdef\enddoublequotes{%
- \catcode`\"=12 %Set " back to other
- }