Hello, Yoshiki. Thanks for detailed answer. It was in image 3.8 from squeak.org
I fix problem by creating accessors to mentioned tables in String and overriding them in WideString. Also some small changes in Character and new class wideCharacterSet. About "variableWordSubclass" and other. I have no words... To create class I send message to it superclass!!! It is beutiful way. I'd understand how it work only after question was posted. Before I thought, that it is a kind of 'keyword' :) Alexei. >> I have problems with WideString. (realy not with WideString, but >> debugger brings me to this class). When I send #beginsWith: message to >> WideString, squeak invokes String>>beginsWith: and this method use >> String>>findSubstring:in:startingAt:matchTable: >> For String matchTables (AsciiOrder CaseInsensitiveOrder >> CaseSensitiveOrder) contains 256 bytes. >> So when invoked 'matchTable at: myWideChar asciiValue + 1' -- i get >> error -- 'subscript is out of bounds'. >> >> How to fix this? >> I must create my own huge tables for wide strings? > > This must be a bug, I think. It is fixed in Squeakland image, but > not incorporated into the mainstream yet. What was the version you > found this? > >> And another question. >> From class definition for WideString >> 'String variableWordSubclass: #WideString' >> What means 'variableWordSubclass' and is it restrict me in some way, >> or I can ignore this? > > There is a concept of the "variable class" in Smalltalk. If you > take an instance of a normal class, its size is fixed (i.e., the > instance has a number of slots that is defined by the "class shape"). > And, each slot are (usually) named, and the name is used to access > them in the user code. > > For a variable class, its instances can have different size. For > example, the instances of Array can be different size, but share the > same behavior provided by the Array class. The slots are index by > numbers. > > A String in Squeak is like an Array. Each (sub-)instance of it can > have different size. A "variable word class" means that a slot of its > instance contains a 32-bit word (non-pointer), and a "variable byte > class" means a slot is 8-bit wide (obviously a non-pointer). > > The restriction? You cannot have a named instance variable in > a non-pointer variable class. > > -- Yoshiki _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
