[Newbies] syntaxHighlightingAsYouTypeLeftArrowAssignment

[Tobias Pape]

> On 18. Jan 2021, at 10:19, Marcel Taeumel <marcel.taeumel at hpi.de> wrote:
> 
> Hi David.
> 
> > I wonder whether it's possible to display the assignment operator '_'
> > underscore as Left Arrow.
> 
> Well, the original font rendered the underscore character ("_") as a left arrow. One could still extend Shout to add a special text attribute to either "_" or ":=" to change to a font that has such a property. Maybe take a look at FormSetFont and the example in FormInspector >> #embedForm:inText:.
> 
> Of course, you could directly change the system's code font to one that renders all "_" as a left arrow, regardless of the context.
> 
> Note that it might be confusing for some users to see a left arrow as a single entity while actually having to type ":" and "=".
> 
> Also note that we removed all underscore assignments ("_") from Squeak's Trunk repository. For good. :-)
> 


SyntaxHighlightingAsYouTypeLeftArrowAssignment _should_ work:
"
'If true, and syntaxHighlightingAsYouType is enabled,  all ANSI format assignments ( := ) will be converted to left arrows ( _ ) when a method is selected in a Browser. Whilst editing a method, this setting has no effect - both the left arrow and the ansi format may be used.
"

If I enable it, I see _ instead of := in all methods, so it works fine.


Note that the fonts themselves support swapping _ and ^ for arrows.

Variant A: (destructive) See TextStyle>>#makeArrows
Variant B: (semi-destructive)
	See StrikeFont>>#useLeftArrow and StrikeFont>>$#useUnderscore.

However, useLeftArrow is not completely right.

It should read:

useLeftArrow
	self characterToGlyphMap.
	characterToGlyphMap at: 96 put: 131.
	characterToGlyphMap at: 95 put: 130.


After that, If you do

```
Preferences enable: #syntaxHighlightingAsYouTypeLeftArrowAssignment.
Preferences standardCodeFont useLeftArrow.

```

You'll see:


However, shout seems to do strange things there if #syntaxHighlightingAsYouTypeLeftArrowAssignment is on.
It tries hard to show the "assignment" as _ no matter what.


That said, It is supposed to somewhat work :)

Best regards
	-Tobias


> Best,
> Marcel
>> Am 16.01.2021 17:03:31 schrieb stes at PANDORA.BE <stes at telenet.be>:
>> 
>> -----BEGIN PGP SIGNED MESSAGE-----
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>> 
>> 
>> Hi,
>> 
>> Platform: squeak 4.19.5 with Squeak 4.6 or squeak 5.x with Squeak 6.0alpha
>> 
>> I wonder whether it's possible to display the assignment operator '_'
>> underscore as Left Arrow.
>> 
>> "Cuis-Smalltalk" is doing this, looks very nice.
>> 
>> I've found something on wiki.squeak.org :
>> 
>> syntaxHighlightingAsYouTypeLeftArrowAssignment
>> 
>> in preferences.
>> 
>> Go to Menu -> Tools -> Preferences
>> (or Menu -> Apps -> Preferences Browser)
>> 
>> Search : syntaxHighlightingAsYouType
>> 
>> (it's under "browsing')
>> 
>> enabled
>> 
>> syntaxHighlightingAsYouTypeLeftArrowAssignment
>> 
>> enabled
>> 
>> does not work : do I need "Shout"
>> 
>> http://wiki.squeak.org/squeak/5700
>> 
>> is Shout still working in 4.6 ?
>> 
>> I have the impression from the wiki.squeak.org page that there existed
>> a package to display '_' as left-arrow but not sure whether it is still there.
>> 
>> David Stes
>> 
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