There is a class of letterals that don't stand for a specific written
symbol, but rather modify the following letterals in a letteral
string. I have chosen to call these "lerfu formatting cmavo".
The CLL is rather skimpy on the details on how these cmavo are to be
interpreted, and how they interact, and this is one of the issues the
BPFK has to decide.
As I (tsali) promised in
http://www.lojban.org/bpfk/viewtopic.php?t=44, I'm making this page to
show what we know about lerfu formatting cmavo from the examples in CLL,
and some possible solutions to situations that aren't described in the
book. Please keep any comments separate from the main text. Thanks.
We assume that all other letterals stand for a distinct symbol, because
otherwise, all letteral sequences with nonce letterals would be
ambiguous as to what is formatting and what is printable characters.
- The lerfu formatting cmavo modifies the immediately following ordinary letteral.
- If X and Y are ordinary letterals, and Z is a lerfu formatting cmavo, and X precedes Y, and X is modified by Z, then Y is also modified by Z, except in cases where Z is a single-lerfu modifier, such as TAU or LAU. In other words, most lerfu formatting cmavo applies at least to the entire contiguous sequence of letterals following it.
All of these are intended to be baseline-compliant, ie. render none of
the examples in CLL invalid. Please add a note if you think this is
- Formatting applies by default to all ordinary letterals of the current sequence
- Formatting is by default additive. For example, "ce'a bold. bu ce'a .italik. bu .abu" results in a lowercase a that is both bold and italic.
- We could establish a system of "categories" that lerfu formatting cmavo can encode "features" of, and say that subsequent lerfu formatting cmavo supersede previous ones in the same category. Thus, "ce'a pavrel. bu .abu ce'a pavnon. bu by." results in a 12pt lowercase a followed by a 10pt lowercase b.
- Formatting may be canceled by a special format that says "revert to state before the application of the last lerfu formatting cmavo".
- Formatting applies to all following letterals in the string which are of "the same kind" as the lerfu formatting cmavo is. Unformatted lerfu forming cmavo apply to the entire remaining text; formatting that appears when Cyrillic shift is active applies to all remaining Cyrillic text, formatting that appears in XI subscripts N levels deep apply in all following subscripts N levels deep, and so on.
- Less crunchy, because it relieves the speaker of the burden of updating many different kinds of formatting when switching contexts.
- Undesirable because it establishes a hierarchical interpretation of a structure that is supposed to be "linear" (actually left-recursive, see grammar rule lerfu_string_root_986).
Create a new set of grammar rules:
- GAhE_1620 (terminal for lerfu formatting cmavo) - move all formatting cmavo here from BY
- ZAI_1621 (terminal for zai and ce'a)
- XUhU_1629 (terminal for new terminator cmavo)
- formatted_lerfu_string_1988 : GAhE_1620 lerfu_string_root_986 XUhU_gap_1410 | ZAI_1621 lerfu_word_987 lerfu_string_root_986 XUhU_gap_1410 ;
- XUhU_gap_1410 : XUhU_1629 | XUhU_1629 free_modifier_32 | error ;
Modify lerfu_string_root_986 thus:
lerfu_string_root_986 : lerfu_word_987
- | lerfu_string_root_986 lerfu_word_987
- | lerfu_string_root_986 PA_672
- | formatted_lerfu_string_1988
I don't see the point of having formatting cmavo in the first place, we don't really need such a wide variety of pronouns, but if they are going to be there then the restriction you propose would make sense. Of course, that means we won't be able to say things like ga'e klama le zarci anymore... xorxes
The point of them is for use in mathematics, where plain-text distinctions require lots of
formatting. For example, A might be a scalar, and A a corresponding vector.
- But do we really want to refer to the vector as ce'a bold bu abu? It seems extremely inconvenient, especially if you have to repeat it several times and together with non-bold variables. (BTW, why are we using the English word "bold" for this?) Why even mention "bold", why not just "-vector bu abu"?
- Probably. But I couldn't be bothered to think of a native term for "bold", and hyphen notation is confusing to many, as well. --tsali