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org.jetbrains.kotlin.diagnostics.rendering.Renderers.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.diagnostics.rendering
import com.google.common.collect.Lists
import com.google.common.collect.Sets
import com.intellij.openapi.diagnostic.Logger
import com.intellij.openapi.util.text.StringUtil
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.cfg.WhenMissingCase
import org.jetbrains.kotlin.cfg.hasUnknown
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.rendering.TabledDescriptorRenderer.newTable
import org.jetbrains.kotlin.diagnostics.rendering.TabledDescriptorRenderer.newText
import org.jetbrains.kotlin.psi.KtClass
import org.jetbrains.kotlin.psi.KtClassOrObject
import org.jetbrains.kotlin.psi.KtNamedDeclaration
import org.jetbrains.kotlin.renderer.DescriptorRenderer
import org.jetbrains.kotlin.renderer.Renderer
import org.jetbrains.kotlin.resolve.DescriptorUtils
import org.jetbrains.kotlin.resolve.MemberComparator
import org.jetbrains.kotlin.resolve.calls.inference.*
import org.jetbrains.kotlin.resolve.calls.inference.TypeBounds.Bound
import org.jetbrains.kotlin.resolve.calls.inference.TypeBounds.BoundKind.LOWER_BOUND
import org.jetbrains.kotlin.resolve.calls.inference.TypeBounds.BoundKind.UPPER_BOUND
import org.jetbrains.kotlin.resolve.calls.inference.constraintPosition.ConstraintPosition
import org.jetbrains.kotlin.resolve.calls.inference.constraintPosition.ConstraintPositionKind
import org.jetbrains.kotlin.resolve.calls.inference.constraintPosition.ConstraintPositionKind.RECEIVER_POSITION
import org.jetbrains.kotlin.resolve.calls.inference.constraintPosition.ConstraintPositionKind.VALUE_PARAMETER_POSITION
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.TypeIntersector
import org.jetbrains.kotlin.types.TypeUtils
import org.jetbrains.kotlin.types.Variance
import org.jetbrains.kotlin.types.checker.KotlinTypeChecker
import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
import java.io.PrintWriter
import java.io.StringWriter
object Renderers {
private val LOG = Logger.getInstance(Renderers::class.java)
@JvmField val TO_STRING: Renderer = Renderer {
element ->
if (element is DeclarationDescriptor) {
LOG.warn("Diagnostic renderer TO_STRING was used to render an instance of DeclarationDescriptor.\n"
+ "This is usually a bad idea, because descriptors' toString() includes some debug information, "
+ "which should not be seen by the user.\nDescriptor: " + element)
}
element.toString()
}
@JvmField val STRING: Renderer = Renderer { it }
@JvmField val THROWABLE: Renderer = Renderer {
val writer = StringWriter()
it.printStackTrace(PrintWriter(writer))
StringUtil.first(writer.toString(), 2048, true)
}
@JvmField val NAME: Renderer = Renderer { it.name.asString() }
@JvmField val NAME_OF_PARENT_OR_FILE: Renderer = Renderer {
if (DescriptorUtils.isTopLevelDeclaration(it) && it is DeclarationDescriptorWithVisibility && it.visibility == Visibilities.PRIVATE) {
"file"
}
else {
"'" + it.containingDeclaration!!.name + "'"
}
}
@JvmField val ELEMENT_TEXT: Renderer = Renderer { it.text }
@JvmField val DECLARATION_NAME: Renderer = Renderer { it.nameAsSafeName.asString() }
@JvmField val RENDER_CLASS_OR_OBJECT: Renderer = Renderer {
classOrObject: KtClassOrObject ->
val name = if (classOrObject.getName() != null) " '" + classOrObject.getName() + "'" else ""
if (classOrObject is KtClass) "Class" + name else "Object" + name
}
@JvmField val RENDER_CLASS_OR_OBJECT_NAME: Renderer = Renderer { it.renderKindWithName() }
@JvmField val RENDER_TYPE: Renderer = Renderer { DescriptorRenderer.FQ_NAMES_IN_TYPES.renderType(it) }
@JvmField val RENDER_POSITION_VARIANCE: Renderer = Renderer {
variance: Variance ->
when (variance) {
Variance.INVARIANT -> "invariant"
Variance.IN_VARIANCE -> "in"
Variance.OUT_VARIANCE -> "out"
}
}
@JvmField val AMBIGUOUS_CALLS: Renderer>> = Renderer {
calls: Collection> ->
calls
.map { it.resultingDescriptor }
.sortedWith(MemberComparator.INSTANCE)
.joinToString(separator = "\n", prefix = "\n") { DescriptorRenderer.FQ_NAMES_IN_TYPES.render(it) }
}
@JvmStatic fun commaSeparated(itemRenderer: Renderer): Renderer> = Renderer {
collection ->
buildString {
val iterator = collection.iterator()
while (iterator.hasNext()) {
val next = iterator.next()
append(itemRenderer.render(next))
if (iterator.hasNext()) {
append(", ")
}
}
}
}
@JvmField val TYPE_INFERENCE_CONFLICTING_SUBSTITUTIONS_RENDERER: Renderer = Renderer {
renderConflictingSubstitutionsInferenceError(it, TabledDescriptorRenderer.create()).toString()
}
@JvmField val TYPE_INFERENCE_PARAMETER_CONSTRAINT_ERROR_RENDERER: Renderer = Renderer {
renderParameterConstraintError(it, TabledDescriptorRenderer.create()).toString()
}
@JvmField val TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER_RENDERER: Renderer = Renderer {
renderNoInformationForParameterError(it, TabledDescriptorRenderer.create()).toString()
}
@JvmField val TYPE_INFERENCE_UPPER_BOUND_VIOLATED_RENDERER: Renderer = Renderer {
renderUpperBoundViolatedInferenceError(it, TabledDescriptorRenderer.create()).toString()
}
@JvmField val TYPE_INFERENCE_CANNOT_CAPTURE_TYPES_RENDERER: Renderer = Renderer {
renderCannotCaptureTypeParameterError(it, TabledDescriptorRenderer.create()).toString()
}
@JvmStatic fun renderConflictingSubstitutionsInferenceError(
inferenceErrorData: InferenceErrorData, result: TabledDescriptorRenderer
): TabledDescriptorRenderer {
LOG.assertTrue(inferenceErrorData.constraintSystem.status.hasConflictingConstraints(),
renderDebugMessage("Conflicting substitutions inference error renderer is applied for incorrect status", inferenceErrorData))
val substitutedDescriptors = Lists.newArrayList()
val substitutors = ConstraintsUtil.getSubstitutorsForConflictingParameters(inferenceErrorData.constraintSystem)
for (substitutor in substitutors) {
val substitutedDescriptor = inferenceErrorData.descriptor.substitute(substitutor)
substitutedDescriptors.add(substitutedDescriptor)
}
val firstConflictingVariable = ConstraintsUtil.getFirstConflictingVariable(inferenceErrorData.constraintSystem)
if (firstConflictingVariable == null) {
LOG.error(renderDebugMessage("There is no conflicting parameter for 'conflicting constraints' error.", inferenceErrorData))
return result
}
result.text(newText()
.normal("Cannot infer type parameter ")
.strong(firstConflictingVariable.name)
.normal(" in "))
val table = newTable()
result.table(table)
table.descriptor(inferenceErrorData.descriptor).text("None of the following substitutions")
for (substitutedDescriptor in substitutedDescriptors) {
val receiverType = DescriptorUtils.getReceiverParameterType(substitutedDescriptor.extensionReceiverParameter)
val errorPositions = Sets.newHashSet()
val parameterTypes = Lists.newArrayList()
for (valueParameterDescriptor in substitutedDescriptor.valueParameters) {
parameterTypes.add(valueParameterDescriptor.type)
if (valueParameterDescriptor.index >= inferenceErrorData.valueArgumentsTypes.size) continue
val actualType = inferenceErrorData.valueArgumentsTypes.get(valueParameterDescriptor.index)
if (!KotlinTypeChecker.DEFAULT.isSubtypeOf(actualType, valueParameterDescriptor.type)) {
errorPositions.add(VALUE_PARAMETER_POSITION.position(valueParameterDescriptor.index))
}
}
if (receiverType != null && inferenceErrorData.receiverArgumentType != null
&& !KotlinTypeChecker.DEFAULT.isSubtypeOf(inferenceErrorData.receiverArgumentType, receiverType)) {
errorPositions.add(RECEIVER_POSITION.position())
}
table.functionArgumentTypeList(receiverType, parameterTypes, { errorPositions.contains(it) })
}
table.text("can be applied to").functionArgumentTypeList(inferenceErrorData.receiverArgumentType, inferenceErrorData.valueArgumentsTypes)
return result
}
@JvmStatic fun renderParameterConstraintError(
inferenceErrorData: InferenceErrorData, renderer: TabledDescriptorRenderer
): TabledDescriptorRenderer {
val constraintErrors = inferenceErrorData.constraintSystem.status.constraintErrors
val errorPositions = constraintErrors.filter { it is ParameterConstraintError }.map { it.constraintPosition }
return renderer.table(
TabledDescriptorRenderer
.newTable()
.descriptor(inferenceErrorData.descriptor)
.text("cannot be applied to")
.functionArgumentTypeList(inferenceErrorData.receiverArgumentType,
inferenceErrorData.valueArgumentsTypes,
{ errorPositions.contains(it) }))
}
@JvmStatic fun renderNoInformationForParameterError(
inferenceErrorData: InferenceErrorData, result: TabledDescriptorRenderer
): TabledDescriptorRenderer {
val firstUnknownVariable = inferenceErrorData.constraintSystem.typeVariables.firstOrNull { variable ->
inferenceErrorData.constraintSystem.getTypeBounds(variable).values.isEmpty()
} ?: return result.apply {
LOG.error(renderDebugMessage("There is no unknown parameter for 'no information for parameter error'.", inferenceErrorData))
}
return result
.text(newText().normal("Not enough information to infer parameter ")
.strong(firstUnknownVariable.name)
.normal(" in "))
.table(newTable()
.descriptor(inferenceErrorData.descriptor)
.text("Please specify it explicitly."))
}
@JvmStatic fun renderUpperBoundViolatedInferenceError(
inferenceErrorData: InferenceErrorData, result: TabledDescriptorRenderer
): TabledDescriptorRenderer {
val constraintSystem = inferenceErrorData.constraintSystem
val status = constraintSystem.status
LOG.assertTrue(status.hasViolatedUpperBound(),
renderDebugMessage("Upper bound violated renderer is applied for incorrect status", inferenceErrorData))
val systemWithoutWeakConstraints = constraintSystem.filterConstraintsOut(ConstraintPositionKind.TYPE_BOUND_POSITION)
val typeParameterDescriptor = inferenceErrorData.descriptor.typeParameters.firstOrNull {
!ConstraintsUtil.checkUpperBoundIsSatisfied(systemWithoutWeakConstraints, it, inferenceErrorData.call, true)
}
if (typeParameterDescriptor == null && status.hasConflictingConstraints()) {
return renderConflictingSubstitutionsInferenceError(inferenceErrorData, result)
}
if (typeParameterDescriptor == null) {
LOG.error(renderDebugMessage("There is no type parameter with violated upper bound for 'upper bound violated' error", inferenceErrorData))
return result
}
val typeVariable = systemWithoutWeakConstraints.descriptorToVariable(inferenceErrorData.call.toHandle(), typeParameterDescriptor)
val inferredValueForTypeParameter = systemWithoutWeakConstraints.getTypeBounds(typeVariable).value
if (inferredValueForTypeParameter == null) {
LOG.error(renderDebugMessage("System without weak constraints is not successful, there is no value for type parameter " +
typeParameterDescriptor.name + "\n: " + systemWithoutWeakConstraints, inferenceErrorData))
return result
}
result.text(newText()
.normal("Type parameter bound for ")
.strong(typeParameterDescriptor.name)
.normal(" in "))
.table(newTable()
.descriptor(inferenceErrorData.descriptor))
var violatedUpperBound: KotlinType? = null
for (upperBound in typeParameterDescriptor.upperBounds) {
val upperBoundWithSubstitutedInferredTypes = systemWithoutWeakConstraints.resultingSubstitutor.substitute(upperBound, Variance.INVARIANT)
if (upperBoundWithSubstitutedInferredTypes != null
&& !KotlinTypeChecker.DEFAULT.isSubtypeOf(inferredValueForTypeParameter, upperBoundWithSubstitutedInferredTypes)) {
violatedUpperBound = upperBoundWithSubstitutedInferredTypes
break
}
}
if (violatedUpperBound == null) {
LOG.error(renderDebugMessage("Type parameter (chosen as violating its upper bound)" +
typeParameterDescriptor.name + " violates no bounds after substitution", inferenceErrorData))
return result
}
val typeRenderer = result.typeRenderer
result.text(newText()
.normal(" is not satisfied: inferred type ")
.error(typeRenderer.render(inferredValueForTypeParameter))
.normal(" is not a subtype of ")
.strong(typeRenderer.render(violatedUpperBound)))
return result
}
@JvmStatic fun renderCannotCaptureTypeParameterError(
inferenceErrorData: InferenceErrorData, result: TabledDescriptorRenderer
): TabledDescriptorRenderer {
val system = inferenceErrorData.constraintSystem
val errors = system.status.constraintErrors
val typeVariableWithCapturedConstraint = errors.firstIsInstanceOrNull()?.typeVariable
if (typeVariableWithCapturedConstraint == null) {
LOG.error(renderDebugMessage("An error 'cannot capture type parameter' is not found in errors", inferenceErrorData))
return result
}
val typeBounds = system.getTypeBounds(typeVariableWithCapturedConstraint)
val boundWithCapturedType = typeBounds.bounds.firstOrNull { it.constrainingType.isCaptured() }
val capturedTypeConstructor = boundWithCapturedType?.constrainingType?.constructor as? CapturedTypeConstructor
if (capturedTypeConstructor == null) {
LOG.error(renderDebugMessage("There is no captured type in bounds, but there is an error 'cannot capture type parameter'", inferenceErrorData))
return result
}
val typeParameter = typeVariableWithCapturedConstraint.originalTypeParameter
val explanation: String
val upperBound = TypeIntersector.getUpperBoundsAsType(typeParameter)
if (!KotlinBuiltIns.isNullableAny(upperBound) && capturedTypeConstructor.typeProjection.projectionKind == Variance.IN_VARIANCE) {
explanation = "Type parameter has an upper bound '" + result.typeRenderer.render(upperBound) + "'" +
" that cannot be satisfied capturing 'in' projection"
}
else {
explanation = "Only top-level type projections can be captured"
}
result.text(newText().normal(
"'" + typeParameter.name + "'" +
" cannot capture " +
"'" + capturedTypeConstructor.typeProjection + "'. " +
explanation
))
return result
}
@JvmField val CLASSES_OR_SEPARATED: Renderer> = Renderer {
descriptors ->
buildString {
var index = 0
for (descriptor in descriptors) {
append(DescriptorUtils.getFqName(descriptor).asString())
index++
if (index <= descriptors.size - 2) {
append(", ")
}
else if (index == descriptors.size - 1) {
append(" or ")
}
}
}
}
private fun renderTypes(types: Collection) = StringUtil.join(types, { RENDER_TYPE.render(it) }, ", ")
@JvmField val RENDER_COLLECTION_OF_TYPES: Renderer> = Renderer { renderTypes(it) }
private fun renderConstraintSystem(constraintSystem: ConstraintSystem, renderTypeBounds: Renderer): String {
val typeBounds = linkedSetOf()
for (variable in constraintSystem.typeVariables) {
typeBounds.add(constraintSystem.getTypeBounds(variable))
}
return "type parameter bounds:\n" +
StringUtil.join(typeBounds, { renderTypeBounds.render(it) }, "\n") + "\n\n" + "status:\n" +
ConstraintsUtil.getDebugMessageForStatus(constraintSystem.status)
}
@JvmField val RENDER_CONSTRAINT_SYSTEM: Renderer = Renderer { renderConstraintSystem(it, RENDER_TYPE_BOUNDS) }
@JvmField val RENDER_CONSTRAINT_SYSTEM_SHORT: Renderer = Renderer { renderConstraintSystem(it, RENDER_TYPE_BOUNDS_SHORT) }
private fun renderTypeBounds(typeBounds: TypeBounds, short: Boolean): String {
val renderBound = { bound: Bound ->
val arrow = if (bound.kind == LOWER_BOUND) ">: " else if (bound.kind == UPPER_BOUND) "<: " else ":= "
val renderer = if (short) DescriptorRenderer.SHORT_NAMES_IN_TYPES else DescriptorRenderer.FQ_NAMES_IN_TYPES
val renderedBound = arrow + renderer.renderType(bound.constrainingType) + if (!bound.isProper) "*" else ""
if (short) renderedBound else renderedBound + '(' + bound.position + ')'
}
val typeVariableName = typeBounds.typeVariable.name
return if (typeBounds.bounds.isEmpty()) {
typeVariableName.asString()
}
else
"$typeVariableName ${StringUtil.join(typeBounds.bounds, renderBound, ", ")}"
}
@JvmField val RENDER_TYPE_BOUNDS: Renderer = Renderer { renderTypeBounds(it, short = false) }
@JvmField val RENDER_TYPE_BOUNDS_SHORT: Renderer = Renderer { renderTypeBounds(it, short = true) }
private fun renderDebugMessage(message: String, inferenceErrorData: InferenceErrorData) = buildString {
append(message)
append("\nConstraint system: \n")
append(RENDER_CONSTRAINT_SYSTEM.render(inferenceErrorData.constraintSystem))
append("\nDescriptor:\n")
append(inferenceErrorData.descriptor)
append("\nExpected type:\n")
if (TypeUtils.noExpectedType(inferenceErrorData.expectedType)) {
append(inferenceErrorData.expectedType)
}
else {
append(RENDER_TYPE.render(inferenceErrorData.expectedType))
}
append("\nArgument types:\n")
if (inferenceErrorData.receiverArgumentType != null) {
append(RENDER_TYPE.render(inferenceErrorData.receiverArgumentType)).append(".")
}
append("(").append(renderTypes(inferenceErrorData.valueArgumentsTypes)).append(")")
}
private val WHEN_MISSING_LIMIT = 7
@JvmField val RENDER_WHEN_MISSING_CASES: Renderer> = Renderer {
if (!it.hasUnknown) {
val list = it.joinToString(", ", limit = WHEN_MISSING_LIMIT) { "'$it'" }
val branches = if (it.size > 1) "branches" else "branch"
"$list $branches or 'else' branch instead"
}
else {
"'else' branch"
}
}
}
