2015-11-09 6:38 GMT+01:00 Thierry Goubier <thierry.goubier@gmail.com>:

Hi Mariano,

Le 09/11/2015 01:13, Mariano Martinez Peck a ��crit :

On Fri, Nov 6, 2015 at 1:59 PM, Mariano Martinez Peck
<marianopeck@gmail.com <mailto:marianopeck@gmail.com>> wrote:

...

Hi Thierry,

I am trying to achieve a similar case like the one I commented in this
post but I am unable to find the way.
Previously I wanted to replace say the literal #oldSelector to
#newSelector. Now,�� I need to use regular expressions. I mean, I would
need to find matches of '*oldSelector*' and do the replace with
'newSelector'. For example,�� the search may find
'*pre*oldSelector*post*' and I want it to be replaced by
'*pre*newSelector*post'. *And of course, I don't know in advance what
pre and post strings there could be.

What you need to do there is to use a match block after the @selector

`{:node | node selector matches: '.*oldSelector.*'}

Which would mean that your patterns become:

rewriter
�� �� �� �� replace: '``@object `oldSelector {:node | node selector matches: '.*oldSelector.*'}'
�� �� �� �� with: '``@object `newSelector {:node | node selector }'.

Wait, not entirely sure. I think you need to add a dictionary in the block to give the with: argument the pre and post string. And I'm not sure about the regular expression above as well.

I need to have access to the SmaCC code source, so I'll answer to you a bit later.

Ok, here is a first try that make a change pre and post included:

| tree |

RBParseTreeRewriter new

replace: '`@object `oldSelector `{:node | node selector asString matchesRegex: ''.*oldSelector.*''}'

with: '`@object newSelector';

executeTree:

(tree := RBParser

parseMethod:

'DoIt ^ [:proxy |��

proxy at: #oldSelector.

proxy preoldSelector.��

proxy oldSelectorAnotherMethod.

proxy do: ''oldSelectorAndSomething''.

"a comment with #oldSelector ��"

]').

tree newSource

But it does not replace yet the right selector.

For that, I will recreate a message send:

| tree |

RBParseTreeRewriter new

replace: '`object `oldSelector `{:node | node selector asString matchesRegex: ''.*oldSelector.*''} `@args'

with: '`{RBMessageNode receiver: `object selector: (`oldSelector selector copyReplaceAll: ''oldSelector'' with: ''newSelector'') asSymbol arguments: `@args}';

executeTree:

(tree := RBParser

parseMethod:

'DoIt ^ [:proxy |��

proxy at: #oldSelector.

proxy preoldSelector.��

proxy oldSelectorAnotherMethod.

proxy do: ''oldSelectorAndSomething''.

"a comment with #oldSelector ��"

]').

tree newSource

Now, I haven't tested with arguments on the message.

Look how you can use pattern variables inside the blocks :)

This is very cool and extremely powerfull.

Thierry

��

Also..do you know where can I find some more info about RB? For example,
if I read this:

rewriter
replace: '``@object ' , oldSeletor
with: '``@object ' , newSelector.

Where can I read that�� ``@object�� ��means XXX ..�� ?

There is a first level of explanation in the Pharo for the Enterprise book; but, yes the pattern language is fairly complex.

Are you going to Smalltalks? John Brant is there and will give a talk on RB and SmaCC (two talks, I believe).

Thierry

Thanks in advance!



�� �� �� �� Or a cascade: a RBParseTreeSearcher which matches blocks; on
�� �� �� �� each block node you activate a rewriter.

�� �� �� �� However, there is an issue in rewriting blocks contents, because
�� �� �� �� it supposes that the method defining the block is recompiled;
�� �� �� �� it's significantly harder to make changes to the code of live
�� �� �� �� blocks (change the bytescode itself? What if the block has
�� �� �� �� multiples instances?).

�� �� �� �� Thierry


�� �� �� �� �� �� If not, I think my easiest path is to automatically compile
�� �� �� �� �� �� dummy/temporal�� classes/methods from the rules, perform the
�� �� �� �� �� �� refactor, then move source from methods to block closures,
�� �� �� �� �� �� and finally remove created classes.

�� �� �� �� �� �� Any pointer is appreciated.

�� �� �� �� �� �� best,

�� �� �� �� �� �� --
�� �� �� �� �� �� Mariano
�� �� �� �� �� �� http://marianopeck.wordpress.com





�� �� --
�� �� Mariano
�� �� http://marianopeck.wordpress.com




--
Mariano
http://marianopeck.wordpress.com