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Now that message handling is properly encapsulated,
remove struct mparse pointers from four structs (roff, roff_man,
tbl_node, eqn_node) and from the argument lists of five functions
(roff_alloc, roff_man_alloc, mandoc_getarg, tbl_alloc, eqn_alloc).
Except for being passed to the main program as an opaque object,
it now only occurs in read.c, as it should, and not across 15 files
like in the past.
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Move tbl(7)-specific parser internals out of libroff.h.
Move some tbl(7)-internal processing from roff.c to tbl.c.
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No need to expose the tbl(7) syntax tree data structures everywhere.
Move them to their own include file, "tbl.h", and improve comments.
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Needed for example by groff_hdtbl(7).
There are two limitations:
It does not support nested .while requests yet,
and each .while loop must start and end in the same scope.
The roff_parseln() return codes are now more flexible
and allow OR'ing options.
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struct tbl_cell. No functional change, minus 40 lines of code.
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I needed this when working on tbl(7) bug fixes.
Deliberately not linked to the build;
this is developer documentation, not user documentation.
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Ingo Schwarze