[liblouis-liblouisxml] Re: order of operations in parser
- From: Ken Perry <kperry@xxxxxxx>
- To: "liblouis-liblouisxml@xxxxxxxxxxxxx" <liblouis-liblouisxml@xxxxxxxxxxxxx>
- Date: Mon, 21 Oct 2013 23:13:47 +0000
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
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