Re: PHPTAL / HTML_Template_PHPTAL (0.4.7) / GetText / Types

Le Fri, 21 Mar 2003 01:41:46 +0000, Richard Wall a écrit : > > I'm too tired to follow it at the moment, but this looks like it might > be interesting (linked from the php weekly update)... > http://marcus-boerger.de/php/ext/spl/spl.phps > ...a php5 iterator interface which works with php's foreach and for loops. > Very interesting, i'm just sorry it's for php5 and look like an extension that won't be installed on every systems :( > Another thing I wanted to ask you about is whether you have had any > success using the iterator in a for loop rather than a while loop. Absolutely not :) in fact now yes The solution (remind me c++ in some ways) solution whould be to use 'for' like what follows : for ($i = $list->iterator(); ! $i->end(); $i->next()) { // stuff with $i->value() } For example, with an iterator over an array(1,2,3) : element 0 : iterator::end() false iterator::hasNext() true element 1 : iterator::end() false iterator::hasNext() true element 2 : iterator::end() false iterator::hasNext() false element 3 : iterator::end() true class ... { .... function end() { return $this->_index >= count($this->_array); } } That work for my iterator implementation (the last element was skipped with it). > - although toString() method gets called when using tal:content etc it > doesn't get called when using alternative ${path/to/object} syntax. On my way :) (understand on my todo) > Also, I wondered whether it might be better to make default call to eg > 'valueOf()'. > > In Javascript toString() is used to give a textual view of > the objects structure, whereas valueOf() returns a simple value. > Wouldn't you say that 'toString()' is more like the Python __repr__() > method which in the case of an array(1,2,3) would return eg [1, 2, 3], > valueOf() might return 6 or 123. What do you think? Well, as the template system outputs string, i'm not sure it should call a valueOf() method. (in java : Integer.valueOf("10") returns an Integer object holding 10) In fact, toString() seems more 'understandable' for non aware developpers, they'll think : "how can i output my object representation in my template ? Ah yes toString()". If we give them a valueOf(), java developers will be lost and the mind association "object/template/printing" will occurs with difficulties (still IMHO). Actually i don't think of toString() as a way to dump data but a way to customize a string appearance of the object (example: calling another template inside toString() ). For common types like arrays, hashtables, i think that we can stay with a "[1, 2, 3]". Deciding that the printing of an array should be '6' or '123" is quite anoying too me :) Will this be the number of elements, the first element, the sqrt of the sum of all elements ? Template designers will 'never' understand why a 6 is output in their template result, and if the 6 change its value each time the page is reloaded ? In fact, we never print containers objects, we loop over them (unless debug). > I think standard types and an iterator interface should be added to > pear. I use something similar to your iterator in my IVM package (also > included in the zip file). I'd rather use method name 'getIterator()' > than 'iterator()' in iterable objects. I think so, standard types should make PEAR coders life easier. The best point in using iterators is we can loop over database results, array, hashtables, files, any collection of data, produced by other packages without making wrappers everywhere. An abstract loop over any kind of iterator is surely better than 200 tests to change the loop behaviour depending of its input type. > I'll try and have a look at doing some docbook docs over the weekend I've started a big document based on my text one. After some editors try (abiword, open office) and because i didn't want to see docbook tags while writing, i failed into kword which allow some basic sgml export, now i'm going with lyx which seems to support SGML (docbook DTDs) with much more features and stability :) Please don't begin a document now, (examples are fine) i'll send you the result of my work as soon as possible (in lyx and docbook format if Lyx/latex do their job as expected). I'll give you my icq number just in case (send separately unless i forget:) -- Laurent Bédubourg laurent.bedubourg@free.fr