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/*
* 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.lazy
import com.google.common.collect.HashMultimap
import com.google.common.collect.ImmutableListMultimap
import com.google.common.collect.ListMultimap
import org.jetbrains.kotlin.config.LanguageVersionSettings
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.incremental.KotlinLookupLocation
import org.jetbrains.kotlin.incremental.components.LookupLocation
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.platform.PlatformToKotlinClassMap
import org.jetbrains.kotlin.psi.KtImportDirective
import org.jetbrains.kotlin.psi.KtPsiUtil
import org.jetbrains.kotlin.resolve.*
import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
import org.jetbrains.kotlin.resolve.scopes.ImportingScope
import org.jetbrains.kotlin.storage.NotNullLazyValue
import org.jetbrains.kotlin.storage.StorageManager
import org.jetbrains.kotlin.types.expressions.OperatorConventions
import org.jetbrains.kotlin.util.collectionUtils.concat
import org.jetbrains.kotlin.utils.Printer
import java.util.*
interface IndexedImports {
val imports: List
fun importsForName(name: Name): Collection
}
class AllUnderImportsIndexed(allImports: Collection) : IndexedImports {
override val imports = allImports.filter { it.isAllUnder }
override fun importsForName(name: Name) = imports
}
class ExplicitImportsIndexed(allImports: Collection) : IndexedImports {
override val imports = allImports.filter { !it.isAllUnder }
private val nameToDirectives: ListMultimap by lazy {
val builder = ImmutableListMultimap.builder()
for (directive in imports) {
val path = directive.importPath ?: continue // parse error
val importedName = path.importedName ?: continue // parse error
builder.put(importedName, directive)
}
builder.build()
}
override fun importsForName(name: Name) = nameToDirectives.get(name)
}
interface ImportResolver {
fun forceResolveAllImports()
fun forceResolveImport(importDirective: KtImportDirective)
}
class LazyImportResolver(
val storageManager: StorageManager,
private val qualifiedExpressionResolver: QualifiedExpressionResolver,
val moduleDescriptor: ModuleDescriptor,
private val platformToKotlinClassMap: PlatformToKotlinClassMap,
val languageVersionSettings: LanguageVersionSettings,
val indexedImports: IndexedImports,
excludedImportNames: Collection,
private val traceForImportResolve: BindingTrace,
private val packageFragment: PackageFragmentDescriptor
) : ImportResolver {
private val importedScopesProvider = storageManager.createMemoizedFunctionWithNullableValues {
directive: KtImportDirective ->
qualifiedExpressionResolver.processImportReference(
directive, moduleDescriptor, traceForImportResolve, excludedImportNames, packageFragment
)
}
private val forceResolveImportDirective = storageManager.createMemoizedFunction {
directive: KtImportDirective ->
val scope = importedScopesProvider(directive)
if (scope is LazyExplicitImportScope) {
val allDescriptors = scope.storeReferencesToDescriptors()
PlatformClassesMappedToKotlinChecker.checkPlatformClassesMappedToKotlin(
platformToKotlinClassMap, traceForImportResolve, directive, allDescriptors
)
}
Unit
}
private val forceResolveAllImportsTask: NotNullLazyValue = storageManager.createLazyValue {
val explicitClassImports = HashMultimap.create()
for (importDirective in indexedImports.imports) {
forceResolveImport(importDirective)
val scope = importedScopesProvider(importDirective)
val alias = KtPsiUtil.getAliasName(importDirective)?.identifier
if (scope != null && alias != null) {
if (scope.getContributedClassifier(Name.identifier(alias), KotlinLookupLocation(importDirective)) != null) {
explicitClassImports.put(alias, importDirective)
}
}
checkResolvedImportDirective(importDirective)
}
for ((alias, import) in explicitClassImports.entries()) {
if (alias.all { it == '_' }) {
traceForImportResolve.report(Errors.UNDERSCORE_IS_RESERVED.on(import))
}
}
for (alias in explicitClassImports.keySet()) {
val imports = explicitClassImports.get(alias)
if (imports.size > 1) {
imports.forEach {
traceForImportResolve.report(Errors.CONFLICTING_IMPORT.on(it, alias))
}
}
}
}
override fun forceResolveAllImports() {
forceResolveAllImportsTask()
}
private fun checkResolvedImportDirective(importDirective: KtImportDirective) {
val importedReference = KtPsiUtil.getLastReference(importDirective.importedReference ?: return) ?: return
val importedDescriptor = traceForImportResolve.bindingContext.get(BindingContext.REFERENCE_TARGET, importedReference) ?: return
val aliasName = importDirective.aliasName
if (importedDescriptor is FunctionDescriptor && importedDescriptor.isOperator &&
aliasName != null && OperatorConventions.isConventionName(Name.identifier(aliasName))) {
traceForImportResolve.report(Errors.OPERATOR_RENAMED_ON_IMPORT.on(importedReference))
}
}
override fun forceResolveImport(importDirective: KtImportDirective) {
forceResolveImportDirective(importDirective)
}
fun selectSingleFromImports(
name: Name,
descriptorSelector: (ImportingScope, Name) -> D?
): D? {
fun compute(): D? {
val imports = indexedImports.importsForName(name)
var target: D? = null
for (directive in imports) {
val resolved = descriptorSelector(getImportScope(directive), name) ?: continue
if (target != null && target != resolved) return null // ambiguity
target = resolved
}
return target
}
return storageManager.compute(::compute)
}
fun collectFromImports(
name: Name,
descriptorsSelector: (ImportingScope, Name) -> Collection
): Collection {
return storageManager.compute {
var descriptors: Collection? = null
for (directive in indexedImports.importsForName(name)) {
val descriptorsForImport = descriptorsSelector(getImportScope(directive), name)
descriptors = descriptors.concat(descriptorsForImport)
}
descriptors ?: emptySet()
}
}
fun getImportScope(directive: KtImportDirective): ImportingScope {
return importedScopesProvider(directive) ?: ImportingScope.Empty
}
}
class LazyImportScope(
override val parent: ImportingScope?,
private val importResolver: LazyImportResolver,
private val filteringKind: LazyImportScope.FilteringKind,
private val debugName: String
) : ImportingScope {
enum class FilteringKind {
ALL,
VISIBLE_CLASSES,
INVISIBLE_CLASSES
}
private fun isClassifierVisible(descriptor: ClassifierDescriptor): Boolean {
if (filteringKind == FilteringKind.ALL) return true
if (descriptor.isHiddenInResolution(importResolver.languageVersionSettings)) return false
val visibility = (descriptor as DeclarationDescriptorWithVisibility).visibility
val includeVisible = filteringKind == FilteringKind.VISIBLE_CLASSES
if (!visibility.mustCheckInImports()) return includeVisible
return Visibilities.isVisibleIgnoringReceiver(descriptor, importResolver.moduleDescriptor) == includeVisible
}
override fun getContributedClassifier(name: Name, location: LookupLocation): ClassifierDescriptor? {
return importResolver.selectSingleFromImports(name) { scope, name ->
val descriptor = scope.getContributedClassifier(name, location)
if ((descriptor is ClassDescriptor || descriptor is TypeAliasDescriptor) && isClassifierVisible(descriptor))
descriptor
else
null /* type parameters can't be imported */
}
}
override fun getContributedPackage(name: Name) = null
override fun getContributedVariables(name: Name, location: LookupLocation): Collection {
if (filteringKind == FilteringKind.INVISIBLE_CLASSES) return listOf()
return importResolver.collectFromImports(name) { scope, name -> scope.getContributedVariables(name, location) }
}
override fun getContributedFunctions(name: Name, location: LookupLocation): Collection {
if (filteringKind == FilteringKind.INVISIBLE_CLASSES) return listOf()
return importResolver.collectFromImports(name) { scope, name -> scope.getContributedFunctions(name, location) }
}
override fun getContributedDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean): Collection {
// we do not perform any filtering by visibility here because all descriptors from both visible/invisible filter scopes are to be added anyway
if (filteringKind == FilteringKind.INVISIBLE_CLASSES) return listOf()
return importResolver.storageManager.compute {
val descriptors = LinkedHashSet()
for (directive in importResolver.indexedImports.imports) {
val importPath = directive.importPath ?: continue
val importedName = importPath.importedName
if (importedName == null || nameFilter(importedName)) {
descriptors.addAll(importResolver.getImportScope(directive).getContributedDescriptors(kindFilter, nameFilter))
}
}
descriptors
}
}
override fun toString() = "LazyImportScope: " + debugName
override fun printStructure(p: Printer) {
p.println(this::class.java.simpleName, ": ", debugName, " {")
p.pushIndent()
p.popIndent()
p.println("}")
}
}
