On Sun, 19 Feb 2017 16:04:31 +0100, stepharong <stephar...@free.fr> wrote:
Hi doru
Yes I know. I did not imply anything.I think that the current status is
bogus.
I do not see any scenario that makes printString not returning and
displaying a string good.
Yes there is one: the self evaluating objects
1 printIt
1
true printIt
true
true printString printIt
'true'
now I'm confused because there is something that does not work.
I do not get why'comics' printString should double quote it.to me
'comics' printString
'comics'
'comics' printIt
'comics'
as well as
(#AAA asClass new name: 'comics') PrintIt
I just to not get what is the benefit not to have in the workspace or
any users of printIt no single quote
I agree that for a list of items
you do not want to have
'astroboy' 'tintin'
but instead astroboy
tintin
I see that lot of people got confused about that. Just look at the
cuboid videos of Roassal you get comboboxes full of ' ' while there
should not have any.
Now to me this is the job of displayString.
displayString is not the same as printString.
printString should return a string and I should see a string in the REPL
Currently in the REPL because this is what we are talking aboutobtaining
a non string is confusing.
Am I clear?
Stef
Hi Stef,
Just a clarification. I do not argue here. I just explain what I see. I
think it was like this since a long time. I even checked in an old VW I
have around and it seems to have the same behavior.
But, I do agree that it is not straightforward at all. It took me a
while to figure this out and it is still confusing sometimes. In fact,
this is why we have a String presentation in the String object - I
>>needed something that clarifies situations like these. That does not
mean it is the best solution :).
On Feb 19, 2017, at 11:42 AM, stepharong <stephar...@free.fr> wrote:
On Sun, 19 Feb 2017 11:40:04 +0100, Sven Van Caekenberghe
<s...@stfx.eu> wrote:
Ah, you're right: there is a difference between printing a textual
representation on a stream / window and doing the same with the
actual (print)string. I was not yet >>>>fully awake I guess.
So
'comics'
>>> comics whatever it means
but
(#AAA asClass new name: 'comics')
>>> ‘comics'
It’s the other way around :).
Example A:
'comics'
>>print it>> ‘comics’ In this case we have a string object and we send
printString to it which in String>>storeOn: adds the quotes as part of
the contents of the new string.
Example B:
(#AAA asClass new name: 'comics')
>>print it>> comics Here we have an non-string object and we sent
printString to it which creates a string with the contents of the
stream. As no String>>storeOn: is invoked in this case, there are no
>>quotes.
So, the two resulting print it strings do not have the same contents.
Maybe another case:
Example C:
(#AAA asClass new name: 'comics’) printString
>>print it>> ‘comics’
This is equivalent to Example A. We send printString to a string
object and we get the quotes.
The issue is that when we send printString to a string, we produce a
new string with escaped quotes:
'comics' = (String streamContents: [:s | s << 'comics’]) contents.
"true"
'comics' = (String streamContents: [:s | s << 'comics']) contents
printString. "false"
I'm sorry but I do not get it at all.
Especially since we always wrote that printIt is sending printString.
I find that totally broken and I do not understand why this is good.
Another thing to keep in mind is:
Example D:
Object new
>>print it>> an Object
This is essentially equivalent with Example A
If Example B would produce >>print it>> ‘comics’
it would mean that Example D would produce
>>print it>> ‘an Object’
Ugh, I already got dizzy with so many quotes :).
One problem is that when you look at a string, you do not know how many
String>>storeOn: commands it went through. So, here is an idea: what if
String>>printString would produce a >>EscapedString, which behaves like
an operator? In this case, we would see better how many levels of
String>>storeOn: are being displayed.
What do you think?
Cheers,
Doru
Stef
On 19 Feb 2017, at 10:59, Tudor Girba <tu...@tudorgirba.com> wrote:
Hi,
Hmm, I think I do not see it :).
Let’s take it slowly. From what I see, the behavior is the same
since at least Pharo 3.
Here is a script that seems to reproduce your situation:
Object subclass: #AAA
instanceVariableNames: 'name'
classVariableNames: ''
package: 'AAA'.
#AAA asClass compile: 'printOn: aStream
aStream << name'.
#AAA asClass compile: 'name: aString
name := aString'.
#AAA asClass new name: 'comics'
In Pharo 6, we have in a Playground:
<Screen Shot 2017-02-19 at 10.48.55 AM.png>
In Pharo 3, we have this in a Workspace:
<Screen Shot 2017-02-19 at 10.49.26 AM.png>
Calling Print It on an object produces a string out of the contents
of the stream, and displaying it shows the contents of the stream
(so, no quotes). >>>>>Calling Print It on a string produces a string
of the string, and displaying it shows the quotes of the first
string.
You can see this in the String tab of the inspector:
<p1.png>
<p2.png>
Does this make sense?
I think this is not inconsistent, but maybe there is a better way.
In any case, the behavior seems to exist since a long time.
Cheers,
Doru
On Feb 19, 2017, at 9:06 AM, stepharong <stephar...@free.fr> wrote:
Hi doru
may be I do not see the obvious.
I defined a class
Object subclass: #MFElement
instanceVariableNames: 'name parent'
classVariableNames: ''
package: 'MyFS2'
printOn: aStream
parent isNil ifFalse: [ parent printOn: aStream ].
aStream << name
name: aString
name := aString
MFDirectory new name: 'comics'.
And when I do
(MFDirectory new name: 'comics')
comics/
(MFDirectory new name: 'comics') printString
'comics/'
Hi Stef,
I think I do not understand the issue.
Here is the screenshot of a Playground.
‘comics’ -> print-it -> ‘comics'
<Mail Attachment.png>
What am I missing?
Cheers,
Doru
On Feb 18, 2017, at 6:26 PM, stepharong <stephar...@free.fr> wrote:
Hi guys
I'm working on an introduction chapter for my future book and I do
not like the behavior I see in latest pharo 60.
And I do not understand the behavior of print-it
(MFDirectory new name: 'comics')
comics/
(MFDirectory new name: 'comics') printString
'comics/'
Why print it does not produce ''?
Stef
printIt
"Treat the current text selection as an expression; evaluate it.
Insert the
description of the result of evaluation after the selection and
then make
this description the new text selection."
| printString |
self
evaluateSelectionAndDo: [ :result |
printString := [ result printString ]
on: Error
do: [ '<error in printString: try ''Inspect it''
to debug>' ].
self afterSelectionInsertAndSelect: printString ]
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