How can I get the full name of KtNameReferenceExpression represent reference? Follow

Answered

Created September 09, 2021 10:55

Hi!

I am developing a codegen IDEA Plugin. I have stuck in getting the full name of KtNameReferenceExpression represent reference for a long time.

For Example:

package com.example.data

data class TestBean(

@SerializedName(KEY_TAG)

val tag: String = ""

): IConfig

The part where font is bold is stored as KtNameReferenceExpression in Psi Tree.

Unfortunately, KtNameReferenceExpression seemingly only contains simple name info (in this case is "KEY_TAG" and "IConfig"), which is not I am seeking for ("com.example.config.KEY_TAG" and "com.example.config.IConfig")

I have try to traverse the KtFile and find any information about "KEY_TAG" or "IConfig", like trying to find all top-level KtDeclaration and trying to find all import list. But it so complex, and I think there is to do this.

Could you please help me to find out a better and correct way to obtain KtNameReferenceExpression full name? Thank you! :)

4 comments

Yann Cebron

Created September 13, 2021 12:56

Resolve the PsiReference from it to obtain the declaration org.jetbrains.kotlin.idea.references.ReferenceUtilsKt#getMainReference(org.jetbrains.kotlin.psi.KtSimpleNameExpression)

Zhangwel261717

Created September 15, 2021 14:37

Sorry for slow response and Thank you Yann. Your solution is work for me.

Before your answer, I do thousand of invesigation and find that I can get a KtExpression(KtNameReferenceExpression is also a KtExpression) by BindingContext.

e.g.

val bindingContext = expression.analyze()
val sourceElement = bindingContext.get(BindingContext.REFERENCE_TARGET, expression)?.toSourceElement
as? KotlinSourceElement
val ktProperty = sourceElement?.psi as? KtProperty
val classId = ktProperty?.type()?.constructor?.declarationDescriptor?.classId
val fullName = "${classId?.packageFqName}.${classId?.relativeClassName}"

Is this whether the method to get the full name of the KtExpression type is recommended? Thank you!

Mikhail Zarechenskiy

Created September 21, 2021 14:26

Yes, the approach is correct but it's possible to simplify your snippet the following way:

val bindingContext = expr.analyze()
val type = bindingContext.getType(expr) ?: return
val classId = type.constructor.declarationDescriptor.classId
...

Zhangwel261717

Created September 22, 2021 07:50

Mikhail Zarechenskiy Thanks for your helpful tip! By writing these I can shorten my code. Have a nice day :)

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