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No need to expose the eqn(7) syntax tree data structures everywhere.
Move them to their own include file, "eqn.h".
While here, delete the unused enum eqn_pilet.
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issue reported by bentley@
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of struct roff_node which is allocated for each equation anyway.
2. Do not keep a list of equation parsers, one parser is enough.
Minus fifty lines of code, no functional change.
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Simplify by just using EQN_LIST with expectargs = 1.
Noticed while investigating a bug report from bentley@.
No functional change.
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not as letters, even if their names contain letters.
This is certainly not perfect, but code to recognize that \(*a is
not an operator but a letter would need a huge table, or Unicode
character property support, which won't happen at this time.
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and write fontstyle or fontweight attributes where required.
Missing features reported by bentley@.
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number of arguments.
Delete struct htmlpair and all the PAIR_*() macros.
Delete enum htmlattr, handle that in print_otag() instead.
Minus 190 lines of code; no functional change except better ordering
of attributes (class before style) in three cases.
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Get rid of the first fatal error, MANDOCERR_EQNSYNT.
In eqn(7), there is no need to be bug-compatible with groff, so there
is no need to abondon the whole equation in case of a syntax error.
In particular:
* Skip "back", "delim", "down", "fwd", "gfont", "gsize", "left",
"right", "size", and "up" without arguments.
* Skip "gsize" and "size" with a non-numeric argument.
* Skip closing delimiters that are not open.
* Skip "above" outside piles.
* For diacritic marks and binary operators without a left operand,
default to an empty box.
* Let piles and matrices take one argument rather than insisting
on a braced list. Let HTML output handle that, too.
* When rewinding, if the root box is guaranteed to match
the termination condition, no error handling is needed.
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and update Copyright year while here; no code change.
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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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