[eclipse-clp-users] UTF8 support for String

Dear CLP users,



   The following predicate returns the Length variable as 12  since the unicode character length is counted as 3 instead of 1. Since there are 3 characters it gets 9 plus 3 Ascii characters equals 12.

string_length("ABC$B%?!<%G(B", Length),

Whereas the following clauses would return N as 6 for the same string since it supports utf8.





string_list("ABC$B%?!<%G(B", List, utf8),

length(List, N),



I have written a list of predicates for string manipulation. They use the existing predicates from library Strings and Atoms like append_strings(?String1, ?String2, ?String3) etc. If I have to support utf8 such that string_length("ABC$B%?!<%G(B", Length, utf8), gives me 6, I have to write my own version for example:-





string_length(STR, Length, utf8):-

string_list(STR, List, utf8),

length(List, Length).



This is just a prototype for illustration. Please let me know if my understanding is right. Replacing all the Strings and Atoms with utf8 support is a task for me given they from sepia-kernel.



Thanks and Regards,

Shrirang Edgaonkar



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