On Mon, Dec 22, 2008 at 3:17 AM, Edward Z. Yang wrote:
>
> Hello all,
>
> While I'm all for using appropriate language features to make
> implementations more readable and efficient, the use of the "yield"
> keyword in the tokenizer makes me pause a little. Why should we not use
> yield?
[...]
> Of course, you can treat these as the complaints of a fogey on PHP who
> doesn't get access to such a nice, shiny language feature. I'd be
> interested in what you all have to say, though.
Can't you replace the use of "yield" with a (non-rewindable) PHP Iterator?
Python:
def my_range(first, count, step):
while count > 0:
yield first
first += step
count -= 1
for i in my_range(1, 10, 2):
print i
PHP:
class MyRange implements Iterator {
private $cur;
private $left;
private $step;
public MyRange($first, $count, $step) {
$this->cur = $first;
$this->left = $count;
$this->step = $step;
}
public function rewind() { }
public function next() { $this->cur += $this->step; $this->left -= 1; }
public function current() { return $this->cur; }
public function valid() { return $this->left > 0; }
public function key() { return "I'm no PHP expert"; }
}
foreach (new MyRange(1, 10, 2) as $i) {
echo $i . "\n";
}
...and I'm +1 to what James said (don't change impls just because PHP
does not have "yield".
--
Thomas Broyer
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