On 08 Jan 2008 18:46:46 +0100, Martin Rubey wrote: > > Gabriel Dos Reis writes: > > > On Tue, 8 Jan 2008, Martin Rubey wrote: > > > > | > > | Gabriel Dos Reis <[EMAIL PROTECTED]> writes: > > | > > | > | > Indeed. And that is what the AXIOM book by Jenks&Sutor documents. > > | > | > Apologies for asking, but why would we want to change that? > > | > | > > | > | Did I say something must be changed? > > | > > > | > I don't think I said you, Ralf, suggested that. > > | > > > | > My understanding of the discussion was that someone was proposing > > something > > | > different from the documented => iterate. > > | > > | No, sorry. As far as I know, in SPAD, > > | > > | => iterate (in fact, not sure about that one) > > | > > | => "next" > > | > > | => "iterate" > > | > > | => nil > > | > > | => "leave" > > | > > | are all equivalent. And I proposed to make them all the same. The > > semantics > > | of => should *not* be changed. > > > > My suggestion is that all, except the `=> iterate', are not documented. > > What's the documentation of => iterate? >
Please refer to section 5.4 of the Axiom book concerning: => break iterate return Elsewhere it is stated: "15.4 Interactive Front-end and Language The leave keyword has been replaced by the break keyword for compatibility with the new Axiom extension language. See section 5.4.3 on page 207 for more information." > > We should be advertizing only the documented form. > > Personally, I do not see the need to recommend them. > > OpenAxiom will unspport them when I get time. > > Almost al of them are confusing, specially the `=> "leave"' form. > > But the semantics is that > > block1 > condition => > block2 > block3 > > executes block1 and block3 if condition evaluates to false, otherwise block1 > and block2. > > In > > condition => "leave" > > it will evaluate "leave" if condition evaluates to true. "leave" evaluates > to itself, a string. In a loop, it doesn't matter to what the final block > of the loop evaluates, the result is thrown away anyway. > Becareful to distinguish between "leave" the string and leave the (deprecated) keyword. Presumably condition => leave is just an old form of condition => break which means to exit from a loop. condition => "leave" means only to exit from the block (not the loop!) with the string value "leave" which is often just thrown away unless it is used in the context where the value is saved. Regards, Bill Page. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ open-axiom-devel mailing list open-axiom-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/open-axiom-devel
