Extend @R_str to allow escaped strings

I just stumbled upon an issue while using the macro @R_str in combination with variables. As macros execute the input in a different namespace, it is not possible to dynamically access e.g. array fields in a loop.

Problematic behavior:

@R_str "myArray[item.id]" led to this error: item not defined

Workaround / proposed fix:

I added another macro with an escaped string, which solved the problem for me:

macro R_str_esc(s)
  :(Symbol($(esc(s))))
end

[hhaensel]

Escaping for R_str is not a good idea. The reason is that Vue supports javascript expressions to be evaluated for its fields. Imagine you would have an array of tooltips tips = ["Hello", "World"] and you wanted to link the first array element to your tooltip. In html code this would read

<q-tooltip v-model="tip[0]"></q-tooltip>"

With StippleUI this translates to

tooltip(fieldname = R"tips[0]")

This would not be possible to write with escaped syntax. Also note the zero-based indexing in javascript.

For your use case I’d rather go for converting it to Symbol explicitly:

tooltip(fieldname = Symbol(myArray[item.id])

[mdotend]

Thank you, that works as intended without the macro!