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This patch introduces three new values to `.cflags':
don't break before character: 128
don't break after character: 256
allow inter-character break: 512
They are handled differently if compared to other cflags values:
(1) hcode values are completely ignored
(2) similar to kern values, and contrary to the other cflags
values, troff looks at pairs of characters to decide whether a
break gets inserted
A yet-to-be-written patch should add inter-character spacing if
those flags are active; currently, only zero-width breakpoints are
inserted.
* src/roff/troff/charinfo.h (charinfo): Change type of `flags' to
`int'. Update callers accordingly.
New enum values `DONT_BREAK_BEFORE', `DONT_BREAK_AFTER', and
`INTER_CHAR_SPACE'.
New member functions `prohibit_break_before',
`prohibit_break_after', and `inter_char_space'.
* src/roff/troff/input.cpp: Updated.
* src/roff/troff/node.cpp (inter_char_space_node): New class similar
to kern_pair_node, collecting charinfo entities with the
abovementioned cflags values.
(break_char_type): Add new enum values.
(glyph_node::merge_glyph_node): Handle abovementioned cflags values
and emit an `inter_char_space_node' if necessary.
* tmac/ja.tmac: Use new cflags values.
* doc/groff.texinfo, NEWS, man/groff_diff.man: Document new values.
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