Will Take scripts support function calls?
brigh...@gmail.com
support, or even object method calls with arbitrary arguments?
Jens Dietrich
Definitely yes. The compiler is already supporting it (see JFunction)
but not the JSPELParser. I have to check whether the juel parser
supports arbitrary function, if yes, only a relatively small
modification in DefaultFunctionFactory would be required.
This was the good news. The bad news is that I don't have time to add
new features until the (northern) summer. I have a lot of teaching at
the moment and also have to keep my research going. But I will
definitely add these features later this year. Or perhaps somebody else
wants to have a go???
Cheers, Jens
brigh...@gmail.com
I'd like to try my best to make a contribution to Take, now in way of
using Take, and I'll give something like benchmarks or test reports as
our project goes on. I'm a newbie to prolog, knowledge representation
and reasoning, AI, etc, but I won't hesitate to try to add some new
features to Take if I can.
Thanks for your kindly help. I'll continue our project from next
Wednesday.
BTW, I'm a Chinese programmer, and coding to make a living ;)
Cheers, BP
On Mar 14, 4:24 pm, Jens Dietrich <jens.dietr...@gmail.com> wrote:
> Hi,
>
> Definitely yes. The compiler is already supporting it (see JFunction)
> but not the JSPELParser. I have to check whether the juel parser
> supports arbitrary function, if yes, only a relatively small
> modification in DefaultFunctionFactory would be required.
>
> This was the good news. The bad news is that I don't have time to add
> new features until the (northern) summer. I have a lot of teaching at
> the moment and also have to keep my research going. But I will
> definitely add these features later this year. Or perhaps somebody else
> wants to have a go???
>
> Cheers, Jens
>
Jens Dietrich
Any help is appreciated, and just documenting the problems and
challenges you face (in blog style) and making them available to us
would definitely help! Writing a benchmark would be even better.
Cheers, Jens
haibo.zheng
Dear Jens,
I'm very interested in how to use object method in take script.
Can you show me some examples about it?
On Mar 16, 5:26 pm, Jens Dietrich <jens.dietr...@gmail.com> wrote:
> Hi there,
>
> Any help is appreciated, and just documenting the problems and
> challenges you face (in blog style) and making them available to us
> would definitely help! Writing a benchmark would be even better.
>
> Cheers, Jens
>
Jens Dietrich
I have added another example to the repository that shows how to
interpret arbitrary functions encountered in scripts - see
example.nz.org.take.compiler.example2 package in the repository. Right
now, functions are only working if they occur in terms. E.g., the
example uses the following rule:
rule1: if 100<turnover(c,12) then category[c,"gold"]
I will add an issue (feature to be added in the next release) that
functions returning booleans can also be used directly as predicates.
Hope this helps for now! Jens
<file:///D:/development/workspaces/defaultworkspace/take/src/example/nz/org/take/compiler/example2/>
<file:///D:/development/workspaces/defaultworkspace/take/src/example/nz/org/take/compiler/example2/>
jens
I have added the three new "enhancement" issues 12, 13 and 14. Please
review them and let me know whether this is what you need. I think it
makes a lot of sense to add those features. Might take a while to get
it done although its not very complicated.
Cheers, Jens
haibo.zheng
Dear Jeans,
Thanks for you help.
I hava updated the example2,
but there may be something wrong in it,
when I run the java application exmaple,
the return value on console is
Exception in thread "main" java.lang.NullPointerException
at example.nz.org.take.compiler.example2.Example.main(Example.java:34)
I don't konw what's wrong with it.
Could you tell me?
Otherwise,I hava seen the scenario 3 in take,
it can support the java function as predicate
when I try to modify this function to support regex,there is something
wrong with it.
I can't get my expected value.
let me show you my code
public class AddrRegex {
public String address;
public String regex;
public AddrRegex(String address,String regex)
{
this.address=address;
this.regex=regex;
}
public String getaddress()
{
return this.address;
}
public String getregex()
{
return this.regex;
}
public boolean isRegex(String regex)
{
Pattern pattern=Pattern.compile(regex);
Matcher matcher=pattern.matcher(this.getaddress());
return matcher.find();
}
public boolean regex(AddrRegex addr)
{
return this.isRegex(addr.regex);
}
public boolean equals(AddrRegex addr)
{
return this.getaddress().equals(addr.getaddress());
}
}
the script
//test for regex in take script
@@dc:author=zhenghaibo
@@dc:date=2008.3.25
var com.tigerknows.camal.evaluator.domain.AddrRegex addr1,addr2
@take.compilerhint.class=IsRegex
@take.compilerhint.slots=addr1,addr2,value
@take.compilerhint.method=isRegex
query IsRegex[in,in,out]
rule1: if regex[addr1.address,addr2.regex] then
IsRegex[addr1,addr2,'true']
the test1.java
public class test1 {
public static void main(String[] args) throws Exception{
RegexKnowledgeBase KB = null; // this is the generated interface
BasicConfigurator.configure();
// compile and bind constants referenced in rules
KnowledgeBaseManager<RegexKnowledgeBase> kbm = new
KnowledgeBaseManager<RegexKnowledgeBase>();
InputStream scriptSource = Example.class
.getResourceAsStream("/addr-regex.take");
KB = kbm.getKnowledgeBase(RegexKnowledgeBase.class,
new ScriptKnowledgeSource(scriptSource));
AddrRegex addr1=new AddrRegex("java","java");
AddrRegex addr2=new AddrRegex("java","java");
ResultSet<IsRegex> result = KB.isRegex(addr1, addr2);
if(result.hasNext())
{
System.out.println(result.next().value);
}
else
{
System.out.println("there is something wrong!");
}
}
}
whatever I do,the only return value is "there is something wrong"
I can't get my expected value "true"
Did I make some mistakes in my code?
brigh...@gmail.com
I've reviewed the issues you added. I think TAKE script's support
for functions/methods will be much better when version 1.6 is
available. But it will be a little confusing to use all of the three
kinds of brackets: "()" of function calls, TAKE query's [], and EL's
[] operator (whose meaning varies according to the context).
My blog is http://www.geocoding.cn/MaHaoming, but I'm sorry that I
don't have much time to write new entries. I hope I'll have more time
on it as our company grows.
BTW, I've helped haibo.zheng out with the ugly AddrRegex example,
and he's my colleague. Last week I focused on other work, I'm back to
TAKE now.
Thank you for your kindly help.
Cheers, BP
Jens Dietrich
Regarding the example: I cannot reproduce the error, it works for me.
Could you check the TAKE version you have (1.5 or latest from
repository) and perhaps send me the stack trace?
Yes, scenario 3 uses functions as predicates but does not use the native
function syntax (it uses [..] instead of (..)).
I think the problem in your example is that you are using regex on the
address fields: regex[addr1.address,addr2.regex]. Therefore the script
parser will try to find a method regex in String (being the type of
addr1.address). This fails because such a method does not exist - regex
will be defined as a predicate that has to be defined by rules).
Cheers, Jens
brigh...@gmail.com
I synchronized example2 with the svn, and got the same error with
haibo.zheng. The full stack trace are here:
Exception in thread "main" java.lang.NullPointerException
at example.nz.org.take.compiler.example2.Example.main(Example.java:
34)
example.nz.org.take.compiler.example2.Example worked well.
> I think the problem in your example is that you are using regex on the
> address fields: regex[addr1.address,addr2.regex]. Therefore the script
> parser will try to find a method regex in String (being the type of
> addr1.address). This fails because such a method does not exist - regex
> will be defined as a predicate that has to be defined by rules).
Cheers, BP