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This adds parser-level support for the grammar described by the eqn
second-edition technical paper, "Typesetting Mathematics — User's Guide"
(Kernighan, Cherry).
The reason for this re-write is the grouping rules, which were not
possible given the existing implementation.
The re-write has also considerably simplified the HTML (and, if it ever
is completed, terminal) front-end.
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nicely right now because eqn uses column ordering.
Also add from/to support and to support.
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This has basic support for positions (under, sup, sub, sub/sup) and piles.
It *does not* support right-left grouping (among many other things), e.g.,
a sub b over c sub d
Which it will interpret, for the time being, as
a sub { b over { c sub d } }
instead of
{ a sub b } over { c sub d }
However, left-right grouping works fine.
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Include <sys/types.h> where needed, it does not belong in config.h.
Remove <stdio.h> from config.h; if it is missing somewhere, it should
be added, but i cannot find a *.c file where it is missing.
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remove trailing whitespace and blanks before tabs, improve some indenting;
no functional change
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completes a full initial eqn system, so I'm tagging a release on it.
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Kristaps Dzonsons
Ingo Schwarze