Chaim Frenkel writes:
IZ> What *I* had in mind that "almost 3/4 of" is represented by the string
IZ> "almost 34 of"
IZ> ```
IZ> xyz
IZ> with markups:
IZ> x = start fraction
IZ> y = boundary between numerator and denominator;
IZ> z = end of fraction
IZ> between chars.
I would have thought that it would be represented as:
almost 34 of
||
|+ denominator \
| +--- rational_number
+- numerator /
I consider defining the regions directly better than looking for
boundaries to determine the regions.
I do not care about implementation. As far as any editing operartion
leaves numberator and denominator adjacent to each other. This is
automatically so if the *implementation* uses 3 boundaries to get the
regions.
*Semantically* having something between y and z means being in
"region" (or whatsoever) "denominator".
IZ> The situation with
IZ> eText is allevivated by the decision to make the markup have width, so
IZ> there is no question whether inserting of "5" between "3" and "4" in
IZ> the above example results in 35/4 or 3/54.
One could remember from which direction the insertion is happening.
After the '3' or before the '4'.
How would
substr($text, 3, 0) = "5"
know?
Ilya
P.S. And you are mixing fractions and rational numbers. 4/5 = -8/-10
as numbers, but they are different fractions.
<chaim>
--
Chaim Frenkel Nonlinear Knowledge, Inc.
chaimf(_at_)pobox(_dot_)com
+1-718-236-0183
