fluent-syntax: Add syntax for plain text interpolation

[mortyccp]

Currently we have Message References.

brandName = Loki
installing = Installing { brandName }.

menu-save = Save
help-menu-save = Click "{ menu-save }" to save the file.

This indicate the translator to not translate the what inside the { }.

I suggest we can add another syntax to make the contents to be translated too.
For example

alert_message = Click #{ here } for more detail.

This is useful because we can keep the sentence to be translated all together. And if we provide AST form of the translated result, we provide the renderer ability to further enhance the appearance or behaviour of the word here.

[zbraniecki]

How is that different from:

alert_message = Click \{ here } for more detail.

?

[stasm]

It sounds like @mortyccp would like the AST to still reflect the fact that here is in a Placeable. If so, then escaping won't cut it. I might suggest the following solution:

alert_message = Click { "here" } for more detail.

[mortyccp]

@stasm Ya it is exactly what I want.

[mortyccp]

One more thing I would like to ask is how this Placeable will be represented in the AST? Does it have identifier for which Placeable it is?

[stasm]

No, there won't be an identifier, just a Placeable with a StringExpression in it. Also note that there has been a recent change to the AST of Placables: in fluent-syntax 0.5.0 the StringExpression will be a sibling of other elements of the Pattern. In #64 we changed this: there's now an intermediate Placeable node. I haven't yet released a new version of fluent-syntax with this change.

[stasm]

fluent-syntax 0.6 has been published and it includes the addition of AST.Placeable. I'm going to close this issue as it looks like #74 (comment) has a viable solution to the original problem.