Call chaining in CoTemplate

[macik]

Have some suggestions for XTemplate methods…

First
Make XTemplate->parse() to return self object, so we can use basic chain to simplified constructions like this:

$t->parse('MAIN');
$t->out('MAIN');

to this:

$t->parse('MAIN')->out('MAIN');

Second
Often while working with complex templates with nested blocks we need to do something like this:

$t->parse('MAIN.SUBBLOCK.INNERBLOCK');
$t->parse('MAIN.SUBBLOCK');
$t->parse('MAIN');

Suggest to add XTemplate->parseChain() method that can do it for us with simply:

$t->parseChain('MAIN.SUBBLOCK.INNERBLOCK');

[trustmaster]

I agree with the first one, that's a great idea!

The second one isn't so brilliant in my opinion. Explicit is better than implicit and by saving a few calls the code looses much of its clarity for people who don't know what exactly parseChain() does. And it's more bug-prone if you forget to split it into multiple calls later when you change code.

[trustmaster]

Now you can chain different XTemplate calls, examples:

$t->assign(array(
    'FOO' => 'bar',
))->parse('MAIN.BLOCK');

$t->parse()->out();

$t->parse('MAIN.SUBBLOCK.INNERBLOCK')->parse('MAIN.SUBBLOCK')->parse('MAIN');

A few other methods support chaining too.

[macik]

Excellent!