Hi, I'm trying to play around with compiler plugin...

# compiler

[Vlad Vamos]

Hi, I'm trying to play around with compiler plugins and cannot get past a problem. My goal is to find all Composable function calls and add something like .testTag("...") to the expression of each argument of type Modifier (I'm using another Modifier extension, but the idea is the same).

Text("My Text") // transformed to: Text("My Text", modifier = Modifier.testTag("..."))
Text("My Second Text", modifier = Modifier.padding(5.dp)) // transformed to: Text("My Second Text", modifier = Modifier.padding(5.dp).testTag("..."))

The problem that I have is that my Modifier-extending plugin only works when the Modifier argument is already set (e.g. Text("...", modifier = Modifier.padding(5.dp)) or even just Text("...", modifier = Modifier)), but not when none is specified: Text("..."). In the latter case, the default value of the parameter is used, even though I have set the Modifier argument to an IrCallImpl equivalent to Modifier.testTag("...") , using argument[index]. What am I missing here?

For reference, this is how I do it.

[shikasd]

It depends if you plugin runs before or after Compose

I believe you don't have to do anything else if it runs before, otherwise you'll have to modify $default parameter to have the bit reset

[Vlad Vamos]

That was it, thanks! Am I understanding it correctly that Compose handles default parameters on its own, as opposed to letting Kotlin do it?