Alex Shinn scripsit:

> You can probably simplify domain notes of when pre-start
> and post-end are valid by stating that, outside of the general
> "String Cursors" section, pre-start is never valid, and post-end
> is only valid as an end argument.

Good idea.

> string-cursor-ref and string-ref/cursor are redundant.

Oops, yes.  I'll keep the latter.

> The string-split/cursors signature

>   (string-split/cursors string [separator [ limit ] ] start end)

> suggests start/end are always required, but sep/limit are
> optional.

That's the intention, but since this has no SRFI-13 counterpart
start and end probably should be optional in this case.  The idea
is that if you want whole strings or indexes, you use SRFI-13, and
if you want cursors, you use SRFI-130, but this is an exception.

> Splitting on predicate is useful and in my experience more
> common than substring.  The opposite (tokenizing) and
> both operations together (partitioning) can also be useful.

I will add string-tokenize/cursors.

> string-pad-both/cursors is well defined and useful for centering.

I'll consider this, but I am trying to stay within the bounds of
SRFI 13.  I'll go through the SRFI 13 email archive to see if there's
been any discussion of it.

> string-compress/cursors is a surprising name, since it has
> nothing to do with general compression.  There's no ambiguity
> in string-remove-consecutive-duplicate-chars/cursors, but if you
> want brevity then "collapse" or even "squash" may be better than
> "compress".

Going with collapse.

> I think the missing string searching and string-join are essential.

I will add string-contains/cursors, but SRFI 13 string-join makes no
provision for substrings (its arguments are list-of-strings, delimiter,
and grammar) so there is no need for string-join/cursors.

> Other useful procedures: prefix?/suffix?/mismatch,

Will add.

> string-chop (chop into fixed-length chunks),

Will consider, but it goes beyond SRFI 13.

> string-replicate (xsubstring),

I think this is useless with cursors; the index version in SRFI 13 does
the Right Thing.

> string-replace (from/to substrings),

Will add.

> string-translate (from/to chars).

Will consider.

--
John Cowan          http://www.ccil.org/~cowan        xxxxxx@ccil.org
I must confess that I have very little notion of what [s. 4 of the British
Trade Marks Act, 1938] is intended to convey, and particularly the sentence
of 253 words, as I make them, which constitutes sub-section 1.  I doubt if
the entire statute book could be successfully searched for a sentence of
equal length which is of more fuliginous obscurity. --MacKinnon LJ, 1940