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org.jetbrains.kotlin.resolve.calls.ValueArgumentsToParametersMapper 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.calls;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.intellij.psi.impl.source.tree.LeafPsiElement;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.builtins.functions.FunctionInvokeDescriptor;
import org.jetbrains.kotlin.descriptors.CallableDescriptor;
import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor;
import org.jetbrains.kotlin.diagnostics.Diagnostic;
import org.jetbrains.kotlin.name.Name;
import org.jetbrains.kotlin.psi.*;
import org.jetbrains.kotlin.resolve.calls.callUtil.CallUtilPackage;
import org.jetbrains.kotlin.resolve.calls.model.*;
import org.jetbrains.kotlin.resolve.calls.tasks.TracingStrategy;
import org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilPackage;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static org.jetbrains.kotlin.diagnostics.Errors.*;
import static org.jetbrains.kotlin.diagnostics.Errors.BadNamedArgumentsTarget.INVOKE_ON_FUNCTION_TYPE;
import static org.jetbrains.kotlin.diagnostics.Errors.BadNamedArgumentsTarget.NON_KOTLIN_FUNCTION;
import static org.jetbrains.kotlin.resolve.BindingContext.REFERENCE_TARGET;
import static org.jetbrains.kotlin.resolve.calls.ValueArgumentsToParametersMapper.Status.*;
public class ValueArgumentsToParametersMapper {
public enum Status {
ERROR(false),
WEAK_ERROR(false),
OK(true);
private final boolean success;
Status(boolean success) {
this.success = success;
}
public boolean isSuccess() {
return success;
}
public Status compose(Status other) {
if (this == ERROR || other == ERROR) return ERROR;
if (this == WEAK_ERROR || other == WEAK_ERROR) return WEAK_ERROR;
return this;
}
}
public static Status mapValueArgumentsToParameters(
@NotNull Call call,
@NotNull TracingStrategy tracing,
@NotNull MutableResolvedCall candidateCall,
@NotNull Set unmappedArguments
) {
//return new ValueArgumentsToParametersMapper().process(call, tracing, candidateCall, unmappedArguments);
Processor processor = new Processor(call, candidateCall, tracing);
processor.process();
unmappedArguments.addAll(processor.unmappedArguments);
return processor.status;
}
private static class Processor {
private final Call call;
private final TracingStrategy tracing;
private final MutableResolvedCall candidateCall;
private final Map parameterByName;
private final Set unmappedArguments = Sets.newHashSet();
private final Map varargs = Maps.newHashMap();
private final Set usedParameters = Sets.newHashSet();
private Status status = OK;
private Processor(@NotNull Call call, @NotNull MutableResolvedCall candidateCall, @NotNull TracingStrategy tracing) {
this.call = call;
this.tracing = tracing;
this.candidateCall = candidateCall;
this.parameterByName = Maps.newHashMap();
for (ValueParameterDescriptor valueParameter : candidateCall.getCandidateDescriptor().getValueParameters()) {
parameterByName.put(valueParameter.getName(), valueParameter);
}
}
// We saw only positioned arguments so far
private final ProcessorState positionedOnly = new ProcessorState() {
private int currentParameter = 0;
@Nullable
public ValueParameterDescriptor nextValueParameter() {
List parameters = candidateCall.getCandidateDescriptor().getValueParameters();
if (currentParameter >= parameters.size()) return null;
ValueParameterDescriptor head = parameters.get(currentParameter);
// If we found a vararg parameter, we are stuck with it forever
if (head.getVarargElementType() == null) {
currentParameter++;
}
return head;
}
@Override
public ProcessorState processNamedArgument(@NotNull ValueArgument argument) {
return positionedThenNamed.processNamedArgument(argument);
}
@Override
public ProcessorState processPositionedArgument(@NotNull ValueArgument argument, int index) {
ValueParameterDescriptor valueParameterDescriptor = nextValueParameter();
if (valueParameterDescriptor != null) {
usedParameters.add(valueParameterDescriptor);
putVararg(valueParameterDescriptor, argument);
}
else {
report(TOO_MANY_ARGUMENTS.on(argument.asElement(), candidateCall.getCandidateDescriptor()));
unmappedArguments.add(argument);
setStatus(WEAK_ERROR);
}
return positionedOnly;
}
};
// We saw zero or more positioned arguments and then a named one
private final ProcessorState positionedThenNamed = new ProcessorState() {
@Override
public ProcessorState processNamedArgument(@NotNull ValueArgument argument) {
assert argument.isNamed();
D candidate = candidateCall.getCandidateDescriptor();
ValueArgumentName argumentName = argument.getArgumentName();
assert argumentName != null;
ValueParameterDescriptor valueParameterDescriptor = parameterByName.get(argumentName.getAsName());
JetReferenceExpression nameReference = argumentName.getReferenceExpression();
if (!candidate.hasStableParameterNames() && nameReference != null) {
report(NAMED_ARGUMENTS_NOT_ALLOWED.on(
nameReference,
candidate instanceof FunctionInvokeDescriptor ? INVOKE_ON_FUNCTION_TYPE : NON_KOTLIN_FUNCTION
));
}
if (valueParameterDescriptor == null) {
if (nameReference != null) {
report(NAMED_PARAMETER_NOT_FOUND.on(nameReference, nameReference));
}
unmappedArguments.add(argument);
setStatus(WEAK_ERROR);
}
else {
if (nameReference != null) {
candidateCall.getTrace().record(REFERENCE_TARGET, nameReference, valueParameterDescriptor);
}
if (!usedParameters.add(valueParameterDescriptor)) {
if (nameReference != null) {
report(ARGUMENT_PASSED_TWICE.on(nameReference));
}
unmappedArguments.add(argument);
setStatus(WEAK_ERROR);
}
else {
putVararg(valueParameterDescriptor, argument);
}
}
return positionedThenNamed;
}
@Override
public ProcessorState processPositionedArgument(
@NotNull ValueArgument argument, int index
) {
report(MIXING_NAMED_AND_POSITIONED_ARGUMENTS.on(argument.asElement()));
setStatus(WEAK_ERROR);
unmappedArguments.add(argument);
return positionedThenNamed;
}
};
public void process() {
ProcessorState state = positionedOnly;
List argumentsInParentheses = CallUtilPackage.getValueArgumentsInParentheses(call);
for (int i = 0; i < argumentsInParentheses.size(); i++) {
ValueArgument valueArgument = argumentsInParentheses.get(i);
if (valueArgument.isNamed()) {
state = state.processNamedArgument(valueArgument);
}
else {
state = state.processPositionedArgument(valueArgument, i);
}
}
for (Map.Entry entry : varargs.entrySet()) {
candidateCall.recordValueArgument(entry.getKey(), entry.getValue());
}
processFunctionLiteralArguments();
reportUnmappedParameters();
}
private void processFunctionLiteralArguments() {
D candidate = candidateCall.getCandidateDescriptor();
List valueParameters = candidate.getValueParameters();
List functionLiteralArguments = call.getFunctionLiteralArguments();
if (!functionLiteralArguments.isEmpty()) {
FunctionLiteralArgument functionLiteralArgument = functionLiteralArguments.get(0);
JetExpression possiblyLabeledFunctionLiteral = functionLiteralArgument.getArgumentExpression();
if (valueParameters.isEmpty()) {
report(TOO_MANY_ARGUMENTS.on(possiblyLabeledFunctionLiteral, candidate));
setStatus(ERROR);
}
else {
ValueParameterDescriptor valueParameterDescriptor = valueParameters.get(valueParameters.size() - 1);
if (valueParameterDescriptor.getVarargElementType() != null) {
report(VARARG_OUTSIDE_PARENTHESES.on(possiblyLabeledFunctionLiteral));
setStatus(ERROR);
}
else {
if (!usedParameters.add(valueParameterDescriptor)) {
report(TOO_MANY_ARGUMENTS.on(possiblyLabeledFunctionLiteral, candidate));
setStatus(WEAK_ERROR);
}
else {
putVararg(valueParameterDescriptor, functionLiteralArgument);
}
}
}
for (int i = 1; i < functionLiteralArguments.size(); i++) {
JetExpression argument = functionLiteralArguments.get(i).getArgumentExpression();
report(MANY_FUNCTION_LITERAL_ARGUMENTS.on(argument));
setStatus(WEAK_ERROR);
}
}
}
private void reportUnmappedParameters() {
List valueParameters = candidateCall.getCandidateDescriptor().getValueParameters();
for (ValueParameterDescriptor valueParameter : valueParameters) {
if (!usedParameters.contains(valueParameter)) {
if (DescriptorUtilPackage.hasDefaultValue(valueParameter)) {
candidateCall.recordValueArgument(valueParameter, DefaultValueArgument.DEFAULT);
}
else if (valueParameter.getVarargElementType() != null) {
candidateCall.recordValueArgument(valueParameter, new VarargValueArgument());
}
else {
tracing.noValueForParameter(candidateCall.getTrace(), valueParameter);
setStatus(ERROR);
}
}
}
}
private void putVararg(
ValueParameterDescriptor valueParameterDescriptor,
ValueArgument valueArgument
) {
if (valueParameterDescriptor.getVarargElementType() != null) {
VarargValueArgument vararg = varargs.get(valueParameterDescriptor);
if (vararg == null) {
vararg = new VarargValueArgument();
varargs.put(valueParameterDescriptor, vararg);
}
vararg.addArgument(valueArgument);
}
else {
LeafPsiElement spread = valueArgument.getSpreadElement();
if (spread != null) {
candidateCall.getTrace().report(NON_VARARG_SPREAD.on(spread));
setStatus(WEAK_ERROR);
}
ResolvedValueArgument argument = new ExpressionValueArgument(valueArgument);
candidateCall.recordValueArgument(valueParameterDescriptor, argument);
}
}
private void setStatus(@NotNull Status newStatus) {
status = status.compose(newStatus);
}
private void report(Diagnostic diagnostic) {
candidateCall.getTrace().report(diagnostic);
}
private interface ProcessorState {
ProcessorState processNamedArgument(@NotNull ValueArgument argument);
ProcessorState processPositionedArgument(@NotNull ValueArgument argument, int index);
}
}
private ValueArgumentsToParametersMapper() {}
}
