Below is a very preliminary documentation of the liblouis scripting
language. It is little more than a description and a list of keywords
and symbols. Future revisions of the scripting language will introduce
features that perform functions that cannot be handled by present
liblouis algorithms, such as placing capitalization and emphasis
indicators after the last word of a phrase.
In the process of implementing the scripting language the older
multipass opcodes were also reimplemented. This introduced some bugs.
Hopefully they are all fixed by now.
-------------------
LIBLOUIS SCRIPT SPECIFICATION
This scripting language provides advanced functionality for the
multipass opcodes.
The original multipass language can still be used. Translation tables
in which it is used should function as expected. The multipass opcodes
are:
correct, change the input before translation;
context, use the multipass feature during translation;
pass2, perform additional processing after translation;
pass3 pass4, still more processing passes.
To use the scripting loanguage place the word "script" after the opcode,
proceeded and followed by whitespace. A single script statement may be
up to 500 characters in length. If it is too long to fit on a single
line it may be continued on additional lines by placing a backslash (\)
at the end of a line.
A script statement consists of three parts: a declarative part that can
be used to give names to variables; an if part; and a then part.
There are 50 integer variables that can be used to record the results
of one script statement for use in another. They can be given names and
operated on with the plus (+) and minus symbols. They can be compared to
numbers using = != <= and >=
Keywords and Symbols
Below are the keywords and symbols used in the scripting language, with
a brief explanation of each.
"attr",
"back",
"def",
"emph",
"find",
"first",
"group",
"last",
"mark",
"rep",
"repcopy",
"repgroup",
"repomit",
"script",
"swap",
"\"",
"@",
"(",
")",
",",
"#",
"+",
"-",
"=",
"<",
">",
"!="
"<=",
">=",
"!",
--
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
