[racket] Text% efficiently iterating over items

You might get away with just using the find-string method of text%,
but if not, then you do have to iterate snip by snip. The positions
inside string-snip%s are offsets from the position of the whole snip
for characters (is that what you're asking for when you say
text-snip%?).

Robby

On Mon, Dec 12, 2011 at 4:08 PM, Erich Rast <erich at snafu.de> wrote:
> Is there a fast way to iterate over items or words in a text% instance
> starting from some position. For example, I'd like to go forward or
> backward starting from a position until a character in a given
> srfi14 char-set is found.
>
> Using a string returned get-text doesn't seem to work in general because
> of the ambiguity between "." meaning dot or being an embedded image.
>
> Do I need to iterate over snips using find-snip and then use the same
> position in the snip if it is a text-snip%? Is the position within a
> text-snip% the same as the position used by find-snip? If not, how do I
> calculate the offset?
>
>
> Best,
>
> Erich
>
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