org.jetbrains.kotlin.resolve.ConstModifierChecker.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.resolve
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.Diagnostic
import org.jetbrains.kotlin.diagnostics.DiagnosticSink
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.psi.KtDeclaration
import org.jetbrains.kotlin.psi.KtProperty
object ConstModifierChecker : DeclarationChecker {
override fun check(
declaration: KtDeclaration,
descriptor: DeclarationDescriptor,
diagnosticHolder: DiagnosticSink,
bindingContext: BindingContext
) {
if (descriptor !is VariableDescriptor || !declaration.hasModifier(KtTokens.CONST_KEYWORD)) return
val constModifierPsiElement = declaration.modifierList!!.getModifier(KtTokens.CONST_KEYWORD)!!
val diagnostic = checkCanBeConst(declaration, constModifierPsiElement, descriptor)
if (diagnostic != null) {
diagnosticHolder.report(diagnostic)
}
}
fun checkCanBeConst(declaration: KtDeclaration,
constModifierPsiElement: PsiElement,
descriptor: VariableDescriptor): Diagnostic? {
if (descriptor.isVar) {
return Errors.WRONG_MODIFIER_TARGET.on(constModifierPsiElement, KtTokens.CONST_KEYWORD, "vars")
}
val containingDeclaration = descriptor.containingDeclaration
if (containingDeclaration is ClassDescriptor && containingDeclaration.kind != ClassKind.OBJECT) {
return Errors.CONST_VAL_NOT_TOP_LEVEL_OR_OBJECT.on(constModifierPsiElement)
}
if (declaration !is KtProperty || descriptor !is PropertyDescriptor) return null
if (declaration.hasDelegate()) {
return Errors.CONST_VAL_WITH_DELEGATE.on(declaration.delegate!!)
}
if (descriptor is PropertyDescriptor && !descriptor.getter!!.isDefault) {
return Errors.CONST_VAL_WITH_GETTER.on(declaration.getter!!)
}
if (!descriptor.type.canBeUsedForConstVal()) {
return Errors.TYPE_CANT_BE_USED_FOR_CONST_VAL.on(constModifierPsiElement, descriptor.type)
}
if (declaration.initializer == null) {
return Errors.CONST_VAL_WITHOUT_INITIALIZER.on(constModifierPsiElement)
}
if (descriptor.compileTimeInitializer == null) {
return Errors.CONST_VAL_WITH_NON_CONST_INITIALIZER.on(declaration.initializer!!)
}
return null
}
}