RFC: escape strings in KConfigBase

Oswald Buddenhagen ossi at kde.org
Tue May 15 15:28:28 BST 2007

On Tue, May 15, 2007 at 11:30:59AM +0200, Andreas Hartmetz wrote:
> On Tuesday 15 May 2007 10:19:59 Thiago Macieira wrote:
> > You don't save user strings in keys. If your program is doing that, I
> > submit that you should redesign it.
> >
> Yeah I don't, actually. But what is to be won by imposing restrictions on 
> keys' names?
back then simplicity, now compatibility ...

> Suppose that you let users define configurable little things and your
> users are also allowed to name them. The little things will be nicely
> separated from the rest of your settings by putting them in their own
> group. Now you have to make up names like "item0001" and put the name
> in the value.
hmm, yes. that's what was always used so far.

> If you want to access your items by name and it should be fast, you
> now have to use another QHash in your program.
if you want it to be fast you would probably preprocess the config anyway.
and since when is working with strings fast?

> "The escape sequences \s, \n, \t, \r, and \\ are supported, meaning ASCII 
> space, newline, tab, carriage return, and backslash, respectively." [1]
> They could have gone the extra millimeter and allow escapting of [,],=,# but 
> nooo...
escapes are only supported in values, not in keys (at least in kconfig).
i'm not saying this is perfect, but your line of argumentation falls
flat. ;)

> "Some keys can have multiple values; these should be separated by a semicolon. 
> Those keys which have several values should have a semicolon as the trailing 
> character. Semicolons in these values need to be escaped using \;"
> Another thing to notice is that desktop files and KDE actually use different 
> list entry delimiters by default (';' vs. ','), and that the spec says that 
> lists should have a trailing ';'. [2]
the delimiter can be passed to the list reading/writing functions.
note that only values that are actually supposed to be lists are

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