[liblouis-liblouisxml] Re: order of operations in parser
- From: "John J. Boyer" <john.boyer@xxxxxxxxxxxxxxxxx>
- To: liblouis-liblouisxml@xxxxxxxxxxxxx
- Date: Mon, 21 Oct 2013 20:10:17 -0500
No. The longest strings are considered first, whatever their opcodes.
John
On Mon, Oct 21, 2013 at 11:13:47PM +0000, Ken Perry wrote:
> But doesn't that make all the other rules operate on words before the word
> rrules?
>
> Ken
>
> -----Original Message-----
> From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx
> [mailto:liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of John J. Boyer
> Sent: Monday, October 21, 2013 3:42 PM
> To: liblouis-liblouisxml@xxxxxxxxxxxxx
> Subject: [liblouis-liblouisxml] Re: order of operations in parser
>
> liblouis operates as follows. The character strings in rules are grouped into
> hash buckets according to their first two characters. (This is modified in
> the new table lookup algorithm.) Within each bucket the strings are arranged
> with the longest string first. If two strings are identical the one
> encountered first in the table compilation goes ahead of the one encountered
> next. Thus it is possible to have identical strings with different opcodes.
> For back-translation the same algorithm is fololowed, except that the dot
> patterns are used instead of the character strings.
>
> During translation the first two characters at the curson position are used
> to generate the hash code, which points to a hash buccket. The strings in
> this bucket are then tested in order. If a matching strring is found the
> opcode associated with it is tested to see if it is valid in the context. If
> so, the dot pattern is placed in an intermediate buffer, If not, the next
> string is tested. If no string is valid the dot pattern for the first
> character is placed inn the buffer and the cursor position is increased by
> one. For valid strings the cursor position is increased by the length of the
> string. As above, for back-translation the same procedure is followed, except
> that the dot patterns are used instead of the character strings.
>
> I hope this helps,
> John
>
> On Mon, Oct 21, 2013 at 06:31:06PM +0000, Ken Perry wrote:
> >
> >
> > John, does the word operation get acted on first or the other rules?
> > I think the word operation should happen first. For example I have a
> > rule
> >
> > Word aft 1-124-2345
> >
> > But it still back translates as
> > Aftert
> >
> >
> > If the word rules were ran first this would not happen ever would it?
> >
> > Ken
>
> --
> John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc.
> http://www.abilitiessoft.com
> Madison, Wisconsin USA
> Developing software for people with disabilities
>
> For a description of the software, to download it and links to project pages
> go to http://www.abilitiessoft.com
> For a description of the software, to download it and links to
> project pages go to http://www.abilitiessoft.com
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
For a description of the software, to download it and links to
project pages go to http://www.abilitiessoft.com
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