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org.jetbrains.kotlin.js.translate.expression.ExpressionVisitor Maven / Gradle / Ivy
/*
* Copyright 2010-2017 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.js.translate.expression;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor;
import org.jetbrains.kotlin.builtins.functions.FunctionClassKind;
import org.jetbrains.kotlin.config.LanguageVersion;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor;
import org.jetbrains.kotlin.descriptors.annotations.KotlinRetention;
import org.jetbrains.kotlin.js.backend.ast.*;
import org.jetbrains.kotlin.js.backend.ast.metadata.MetadataProperties;
import org.jetbrains.kotlin.js.backend.ast.metadata.SpecialFunction;
import org.jetbrains.kotlin.js.naming.NameSuggestion;
import org.jetbrains.kotlin.js.translate.context.TranslationContext;
import org.jetbrains.kotlin.js.translate.declaration.ClassTranslator;
import org.jetbrains.kotlin.js.translate.declaration.PropertyTranslatorKt;
import org.jetbrains.kotlin.js.translate.general.Translation;
import org.jetbrains.kotlin.js.translate.general.TranslatorVisitor;
import org.jetbrains.kotlin.js.translate.operation.BinaryOperationTranslator;
import org.jetbrains.kotlin.js.translate.operation.UnaryOperationTranslator;
import org.jetbrains.kotlin.js.translate.reference.*;
import org.jetbrains.kotlin.js.translate.utils.BindingUtils;
import org.jetbrains.kotlin.js.translate.utils.JsAstUtils;
import org.jetbrains.kotlin.js.translate.utils.TranslationUtils;
import org.jetbrains.kotlin.js.translate.utils.UtilsKt;
import org.jetbrains.kotlin.js.translate.utils.mutator.CoercionMutator;
import org.jetbrains.kotlin.js.translate.utils.mutator.LastExpressionMutator;
import org.jetbrains.kotlin.name.ClassId;
import org.jetbrains.kotlin.name.FqName;
import org.jetbrains.kotlin.name.Name;
import org.jetbrains.kotlin.psi.*;
import org.jetbrains.kotlin.psi.psiUtil.PsiUtilsKt;
import org.jetbrains.kotlin.resolve.BindingContext;
import org.jetbrains.kotlin.resolve.BindingContextUtils;
import org.jetbrains.kotlin.resolve.DescriptorUtils;
import org.jetbrains.kotlin.resolve.bindingContextUtil.BindingContextUtilsKt;
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
import org.jetbrains.kotlin.resolve.constants.CompileTimeConstant;
import org.jetbrains.kotlin.resolve.constants.evaluate.ConstantExpressionEvaluator;
import org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt;
import org.jetbrains.kotlin.resolve.inline.InlineUtil;
import org.jetbrains.kotlin.types.KotlinType;
import org.jetbrains.kotlin.types.expressions.DoubleColonLHS;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.jetbrains.kotlin.descriptors.FindClassInModuleKt.findClassAcrossModuleDependencies;
import static org.jetbrains.kotlin.js.translate.context.Namer.GET_KCLASS_FROM_EXPRESSION;
import static org.jetbrains.kotlin.js.translate.context.Namer.getCapturedVarAccessor;
import static org.jetbrains.kotlin.js.translate.general.Translation.translateAsExpression;
import static org.jetbrains.kotlin.js.translate.utils.BindingUtils.*;
import static org.jetbrains.kotlin.js.translate.utils.ErrorReportingUtils.message;
import static org.jetbrains.kotlin.js.translate.utils.JsAstUtils.*;
import static org.jetbrains.kotlin.js.translate.utils.JsDescriptorUtils.getReceiverParameterForDeclaration;
import static org.jetbrains.kotlin.js.translate.utils.TranslationUtils.translateInitializerForProperty;
import static org.jetbrains.kotlin.resolve.BindingContext.*;
import static org.jetbrains.kotlin.resolve.calls.callUtil.CallUtilKt.getResolvedCallWithAssert;
import static org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt.getAnnotationClass;
import static org.jetbrains.kotlin.types.expressions.ExpressionTypingUtils.isFunctionExpression;
import static org.jetbrains.kotlin.types.expressions.ExpressionTypingUtils.isFunctionLiteral;
public final class ExpressionVisitor extends TranslatorVisitor {
private static final FqName primitiveClassesFqName = new FqName("kotlin.reflect.js.internal.PrimitiveClasses");
@Override
protected JsNode emptyResult(@NotNull TranslationContext context) {
return new JsNullLiteral();
}
@Override
@NotNull
public JsNode visitConstantExpression(@NotNull KtConstantExpression expression, @NotNull TranslationContext context) {
return translateConstantExpression(expression, context).source(expression);
}
@NotNull
private static JsNode translateConstantExpression(@NotNull KtConstantExpression expression, @NotNull TranslationContext context) {
CompileTimeConstant compileTimeValue = ConstantExpressionEvaluator.getConstant(expression, context.bindingContext());
assert compileTimeValue != null : message(expression, "Expression is not compile time value: " + expression.getText() + " ");
JsNode result = Translation.translateConstant(compileTimeValue, expression, context);
if (result == null) {
throw new AssertionError(message(expression, "Unsupported constant expression: " + expression.getText() + " "));
}
return result;
}
@Override
@NotNull
public JsNode visitBlockExpression(@NotNull KtBlockExpression jetBlock, @NotNull TranslationContext context) {
List statements = jetBlock.getStatements();
JsBlock jsBlock = new JsBlock();
for (KtExpression statement : statements) {
JsNode jsNode = Translation.translateExpression(statement, context, jsBlock);
JsStatement jsStatement = convertToStatement(jsNode);
if (!JsAstUtils.isEmptyStatement(jsStatement)) {
jsBlock.getStatements().add(jsStatement);
}
}
if (statements.isEmpty()) {
ClassDescriptor unitClass = context.getCurrentModule().getBuiltIns().getUnit();
jsBlock.getStatements().add(JsAstUtils.asSyntheticStatement(
ReferenceTranslator.translateAsValueReference(unitClass, context)));
}
return jsBlock;
}
@Override
public JsNode visitDestructuringDeclaration(@NotNull KtDestructuringDeclaration multiDeclaration, @NotNull TranslationContext context) {
KtExpression jetInitializer = multiDeclaration.getInitializer();
assert jetInitializer != null : "Initializer for multi declaration must be not null";
JsExpression initializer = Translation.translateAsExpression(jetInitializer, context);
JsName parameterName = JsScope.declareTemporary();
JsVars tempVarDeclaration = JsAstUtils.newVar(parameterName, initializer);
MetadataProperties.setSynthetic(tempVarDeclaration, true);
context.addStatementToCurrentBlock(tempVarDeclaration);
return DestructuringDeclarationTranslator.translate(multiDeclaration, JsAstUtils.pureFqn(parameterName, null), context);
}
@Override
@NotNull
public JsNode visitReturnExpression(@NotNull KtReturnExpression jetReturnExpression, @NotNull TranslationContext context) {
KtExpression returned = jetReturnExpression.getReturnedExpression();
// TODO: add related descriptor to context and use it here
KtDeclarationWithBody parent = PsiTreeUtil.getParentOfType(jetReturnExpression, KtDeclarationWithBody.class);
if (parent instanceof KtSecondaryConstructor) {
ClassDescriptor classDescriptor = context.getClassDescriptor();
assert classDescriptor != null : "Missing class descriptor in context while translating constructor: " +
PsiUtilsKt.getTextWithLocation(jetReturnExpression);
JsExpression ref = ReferenceTranslator.translateAsValueReference(classDescriptor.getThisAsReceiverParameter(), context);
return new JsReturn(ref.source(jetReturnExpression));
}
FunctionDescriptor returnTarget = getNonLocalReturnTarget(jetReturnExpression, context);
JsReturn jsReturn;
if (returned == null) {
jsReturn = new JsReturn(null);
}
else {
JsExpression jsReturnExpression = translateAsExpression(returned, context);
KotlinType returnedType = context.bindingContext().getType(returned);
assert returnedType != null : "Resolved return expression is expected to have type: " +
PsiUtilsKt.getTextWithLocation(jetReturnExpression);
CallableDescriptor returnTargetOrCurrentFunction = returnTarget;
if (returnTargetOrCurrentFunction == null) {
returnTargetOrCurrentFunction = (CallableDescriptor) context.getDeclarationDescriptor();
}
if (returnTargetOrCurrentFunction != null) {
jsReturnExpression = TranslationUtils.coerce(context, jsReturnExpression,
TranslationUtils.getReturnTypeForCoercion(returnTargetOrCurrentFunction));
}
jsReturn = new JsReturn(jsReturnExpression);
}
MetadataProperties.setReturnTarget(jsReturn, returnTarget);
return jsReturn.source(jetReturnExpression);
}
@Nullable
private static FunctionDescriptor getNonLocalReturnTarget(
@NotNull KtReturnExpression expression,
@NotNull TranslationContext context
) {
DeclarationDescriptor descriptor = context.getDeclarationDescriptor();
assert descriptor instanceof CallableMemberDescriptor : "Return expression can only be inside callable declaration: " +
PsiUtilsKt.getTextWithLocation(expression);
KtSimpleNameExpression target = expression.getTargetLabel();
//call inside lambda
if (isFunctionLiteral(descriptor) || isFunctionExpression(descriptor)) {
if (target == null) {
if (isFunctionLiteral(descriptor)) {
return BindingContextUtils.getContainingFunctionSkipFunctionLiterals(descriptor, true).getFirst();
}
}
else {
PsiElement element = context.bindingContext().get(LABEL_TARGET, target);
descriptor = context.bindingContext().get(DECLARATION_TO_DESCRIPTOR, element);
}
}
assert descriptor == null || descriptor instanceof FunctionDescriptor :
"Function descriptor expected to be target of return label: " + PsiUtilsKt.getTextWithLocation(expression);
return (FunctionDescriptor) descriptor;
}
@Override
@NotNull
public JsNode visitParenthesizedExpression(@NotNull KtParenthesizedExpression expression,
@NotNull TranslationContext context) {
KtExpression expressionInside = expression.getExpression();
if (expressionInside != null) {
return Translation.translateExpression(expressionInside, context);
}
return JsEmpty.INSTANCE;
}
@Override
@NotNull
public JsNode visitBinaryExpression(@NotNull KtBinaryExpression expression,
@NotNull TranslationContext context) {
return BinaryOperationTranslator.translate(expression, context);
}
@Override
@NotNull
// assume it is a local variable declaration
public JsNode visitProperty(@NotNull KtProperty expression, @NotNull TranslationContext context) {
VariableDescriptor descriptor = BindingContextUtils.getNotNull(context.bindingContext(), BindingContext.VARIABLE, expression);
JsExpression initializer = translateInitializerForProperty(expression, context);
KtExpression delegateExpression = expression.getDelegateExpression();
JsName name = context.getNameForDescriptor(descriptor);
if (delegateExpression != null) {
initializer = PropertyTranslatorKt.translateDelegateOrInitializerExpression(context, expression);
assert initializer != null : "Initializer must be non-null for property with delegate";
}
else if (context.isBoxedLocalCapturedInClosure(descriptor)) {
JsNameRef alias = getCapturedVarAccessor(name.makeRef());
initializer = JsAstUtils.wrapValue(alias, initializer == null ? new JsNullLiteral() : initializer);
}
return newVar(name, initializer).source(expression);
}
@Override
@NotNull
public JsNode visitCallableReferenceExpression(@NotNull KtCallableReferenceExpression expression, @NotNull TranslationContext context) {
return CallableReferenceTranslator.INSTANCE.translate(expression, context);
}
@Override
public JsNode visitClassLiteralExpression(
@NotNull KtClassLiteralExpression expression, TranslationContext context
) {
KtExpression receiverExpression = expression.getReceiverExpression();
assert receiverExpression != null : "Class literal expression should have a left-hand side";
DoubleColonLHS lhs = context.bindingContext().get(DOUBLE_COLON_LHS, receiverExpression);
assert lhs != null : "Class literal expression should have LHS resolved";
ClassifierDescriptor descriptor = lhs.getType().getConstructor().getDeclarationDescriptor();
if (lhs instanceof DoubleColonLHS.Expression && !((DoubleColonLHS.Expression) lhs).isObjectQualifier()) {
JsExpression receiver = translateAsExpression(receiverExpression, context);
receiver = TranslationUtils.coerce(context, receiver, context.getCurrentModule().getBuiltIns().getAnyType());
if (isPrimitiveClassLiteral(lhs.getType())) {
JsExpression primitiveExpression = getPrimitiveClass(context, descriptor);
if (primitiveExpression != null) {
return JsAstUtils.newSequence(Arrays.asList(receiver, primitiveExpression));
}
}
return new JsInvocation(context.namer().kotlin(GET_KCLASS_FROM_EXPRESSION), receiver);
}
return getObjectKClass(context, descriptor);
}
@NotNull
public static JsExpression getObjectKClass(@NotNull TranslationContext context, @Nullable ClassifierDescriptor descriptor) {
JsExpression primitiveExpression = getPrimitiveClass(context, descriptor);
if (primitiveExpression != null) return primitiveExpression;
// getKClass should be imported as intrinsic when used outside of inline context, otherwise bootstrap fails.
// Inside an inline function it should however be marked as SpecialFunction to support T::class when T -> Int (KT-32215)
JsName kClassName = context.getNameForIntrinsic(SpecialFunction.GET_KCLASS.getSuggestedName());
MetadataProperties.setSpecialFunction(kClassName, SpecialFunction.GET_KCLASS);
return new JsInvocation(kClassName.makeRef(), UtilsKt.getReferenceToJsClass(descriptor, context));
}
@Nullable
public static JsExpression getPrimitiveClass(@NotNull TranslationContext context, @Nullable ClassifierDescriptor classifierDescriptor) {
if (!context.getConfig().isAtLeast(LanguageVersion.KOTLIN_1_2) || findPrimitiveClassesObject(context) == null) return null;
if (!(classifierDescriptor instanceof ClassDescriptor)) return null;
ClassDescriptor descriptor = (ClassDescriptor) classifierDescriptor;
FqName fqName = DescriptorUtilsKt.getFqNameSafe(descriptor);
switch (fqName.asString()) {
case "kotlin.Boolean":
case "kotlin.Byte":
case "kotlin.Short":
case "kotlin.Int":
case "kotlin.Float":
case "kotlin.Double":
case "kotlin.String":
case "kotlin.Array":
case "kotlin.Any":
case "kotlin.Throwable":
case "kotlin.Number":
case "kotlin.Nothing":
case "kotlin.BooleanArray":
case "kotlin.CharArray":
case "kotlin.ByteArray":
case "kotlin.ShortArray":
case "kotlin.IntArray":
case "kotlin.LongArray":
case "kotlin.FloatArray":
case "kotlin.DoubleArray":
return getKotlinPrimitiveClassRef(context, StringUtil.decapitalize(fqName.shortName().asString()) + "Class");
default: {
if (descriptor instanceof FunctionClassDescriptor) {
FunctionClassDescriptor functionClassDescriptor = (FunctionClassDescriptor) descriptor;
if (functionClassDescriptor.getFunctionKind() == FunctionClassKind.Function) {
ClassDescriptor primitivesObject = findPrimitiveClassesObject(context);
assert primitivesObject != null;
FunctionDescriptor function = DescriptorUtils.getFunctionByName(
primitivesObject.getUnsubstitutedMemberScope(), Name.identifier("functionClass"));
JsExpression functionRef = pureFqn(context.getInlineableInnerNameForDescriptor(function), null);
return new JsInvocation(functionRef, new JsIntLiteral(functionClassDescriptor.getArity()));
}
}
break;
}
}
return null;
}
@NotNull
private static JsExpression getKotlinPrimitiveClassRef(@NotNull TranslationContext context, @NotNull String name) {
ClassDescriptor primitivesObject = findPrimitiveClassesObject(context);
assert primitivesObject != null;
PropertyDescriptor property = DescriptorUtils.getPropertyByName(
primitivesObject.getUnsubstitutedMemberScope(), Name.identifier(name));
return pureFqn(context.getInlineableInnerNameForDescriptor(property), null);
}
private static boolean isPrimitiveClassLiteral(@NotNull KotlinType type) {
return KotlinBuiltIns.isPrimitiveType(type) || KotlinBuiltIns.isArray(type) || KotlinBuiltIns.isPrimitiveArray(type);
}
@Nullable
private static ClassDescriptor findPrimitiveClassesObject(@NotNull TranslationContext context) {
return findClassAcrossModuleDependencies(context.getCurrentModule(), ClassId.topLevel(primitiveClassesFqName));
}
@Override
@NotNull
public JsNode visitCallExpression(
@NotNull KtCallExpression expression,
@NotNull TranslationContext context
) {
return CallExpressionTranslator.translate(expression, null, context).source(expression);
}
@Override
@NotNull
public JsNode visitIfExpression(@NotNull KtIfExpression expression, @NotNull TranslationContext context) {
assert expression.getCondition() != null : "condition should not ne null: " + expression.getText();
JsExpression testExpression = Translation.translateAsExpression(expression.getCondition(), context);
KotlinType type = context.bindingContext().getType(expression);
boolean isKotlinExpression = BindingContextUtilsKt.isUsedAsExpression(expression, context.bindingContext());
KtExpression thenExpression = expression.getThen();
KtExpression elseExpression = expression.getElse();
JsStatement thenStatement =
thenExpression != null ? Translation.translateAsStatementAndMergeInBlockIfNeeded(thenExpression, context) : null;
JsStatement elseStatement =
elseExpression != null ? Translation.translateAsStatementAndMergeInBlockIfNeeded(elseExpression, context) : null;
if (type != null) {
if (thenStatement != null) {
thenStatement = LastExpressionMutator.mutateLastExpression(thenStatement, new CoercionMutator(type, context));
}
if (elseStatement != null) {
elseStatement = LastExpressionMutator.mutateLastExpression(elseStatement, new CoercionMutator(type, context));
}
}
if (isKotlinExpression) {
JsExpression jsThenExpression = JsAstUtils.extractExpressionFromStatement(thenStatement);
JsExpression jsElseExpression = JsAstUtils.extractExpressionFromStatement(elseStatement);
boolean canBeJsExpression = jsThenExpression != null && jsElseExpression != null;
if (canBeJsExpression) {
return new JsConditional(testExpression, jsThenExpression, jsElseExpression).source(expression);
}
}
if (thenStatement == null) {
thenStatement = JsEmpty.INSTANCE;
}
JsIf ifStatement = new JsIf(testExpression, thenStatement, elseStatement);
return ifStatement.source(expression);
}
@Override
@NotNull
public JsExpression visitSimpleNameExpression(@NotNull KtSimpleNameExpression expression,
@NotNull TranslationContext context) {
return ReferenceTranslator.translateSimpleName(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitWhileExpression(@NotNull KtWhileExpression expression, @NotNull TranslationContext context) {
return LoopTranslator.createWhile(false, expression, context);
}
@Override
@NotNull
public JsNode visitDoWhileExpression(@NotNull KtDoWhileExpression expression, @NotNull TranslationContext context) {
return LoopTranslator.createWhile(true, expression, context);
}
@Override
@NotNull
public JsNode visitStringTemplateExpression(@NotNull KtStringTemplateExpression expression, @NotNull TranslationContext context) {
JsStringLiteral stringLiteral = resolveAsStringConstant(expression, context);
if (stringLiteral != null) {
return stringLiteral.source(expression);
}
return resolveAsTemplate(expression, context).source(expression);
}
@NotNull
private static JsNode resolveAsTemplate(@NotNull KtStringTemplateExpression expression,
@NotNull TranslationContext context) {
return StringTemplateTranslator.translate(expression, context);
}
@Nullable
private static JsStringLiteral resolveAsStringConstant(@NotNull KtExpression expression,
@NotNull TranslationContext context) {
Object value = getCompileTimeValue(context.bindingContext(), expression);
if (value == null) {
return null;
}
assert value instanceof String : "Compile time constant template should be a String constant.";
String constantString = (String) value;
return new JsStringLiteral(constantString);
}
@Override
@NotNull
public JsNode visitDotQualifiedExpression(@NotNull KtDotQualifiedExpression expression, @NotNull TranslationContext context) {
return QualifiedExpressionTranslator.translateQualifiedExpression(expression, context);
}
@Override
public JsNode visitLabeledExpression(@NotNull KtLabeledExpression expression, @NotNull TranslationContext context) {
KtExpression baseExpression = expression.getBaseExpression();
assert baseExpression != null;
if (BindingContextUtilsKt.isUsedAsExpression(expression, context.bindingContext())) {
return Translation.translateAsExpression(baseExpression, context).source(expression);
}
JsScope scope = context.scope();
assert scope instanceof JsFunctionScope: "Labeled statement is unexpected outside of function scope";
JsFunctionScope functionScope = (JsFunctionScope) scope;
String labelIdent = getReferencedName(expression.getTargetLabel());
JsName labelName = functionScope.enterLabel(labelIdent, NameSuggestion.sanitizeName(labelIdent));
JsStatement baseStatement = Translation.translateAsStatement(baseExpression, context);
functionScope.exitLabel();
return new JsLabel(labelName, baseStatement).source(expression);
}
@Override
@NotNull
public JsNode visitPrefixExpression(
@NotNull KtPrefixExpression expression,
@NotNull TranslationContext context
) {
return UnaryOperationTranslator.translate(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitPostfixExpression(@NotNull KtPostfixExpression expression,
@NotNull TranslationContext context) {
return UnaryOperationTranslator.translate(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitIsExpression(@NotNull KtIsExpression expression,
@NotNull TranslationContext context) {
return Translation.patternTranslator(context).translateIsExpression(expression).source(expression);
}
@Override
@NotNull
public JsNode visitSafeQualifiedExpression(@NotNull KtSafeQualifiedExpression expression,
@NotNull TranslationContext context) {
return QualifiedExpressionTranslator.translateQualifiedExpression(expression, context).source(expression);
}
@Override
@Nullable
public JsNode visitWhenExpression(@NotNull KtWhenExpression expression,
@NotNull TranslationContext context) {
return WhenTranslator.translate(expression, context);
}
@Override
@NotNull
public JsNode visitBinaryWithTypeRHSExpression(
@NotNull KtBinaryExpressionWithTypeRHS expression,
@NotNull TranslationContext context
) {
JsExpression jsExpression;
if (PatternTranslator.isCastExpression(expression)) {
jsExpression = PatternTranslator.newInstance(context).translateCastExpression(expression);
}
else {
jsExpression = Translation.translateAsExpression(expression.getLeft(), context);
}
return jsExpression.source(expression);
}
private static String getReferencedName(KtSimpleNameExpression expression) {
return expression.getReferencedName()
.replaceAll("^@", "")
.replaceAll("(?:^`(.*)`$)", "$1");
}
private static JsNameRef getTargetLabel(KtExpressionWithLabel expression, TranslationContext context) {
KtSimpleNameExpression labelElement = expression.getTargetLabel();
if (labelElement == null) {
return null;
}
String labelIdent = getReferencedName(labelElement);
JsScope scope = context.scope();
assert scope instanceof JsFunctionScope: "Labeled statement is unexpected outside of function scope";
JsName labelName = ((JsFunctionScope) scope).findLabel(labelIdent);
assert labelName != null;
return labelName.makeRef();
}
@Override
@NotNull
public JsNode visitBreakExpression(@NotNull KtBreakExpression expression, @NotNull TranslationContext context) {
return new JsBreak(getTargetLabel(expression, context)).source(expression);
}
@Override
@NotNull
public JsNode visitContinueExpression(@NotNull KtContinueExpression expression, @NotNull TranslationContext context) {
return new JsContinue(getTargetLabel(expression, context)).source(expression);
}
@Override
@NotNull
public JsNode visitLambdaExpression(@NotNull KtLambdaExpression expression, @NotNull TranslationContext context) {
return new LiteralFunctionTranslator(context).translate(expression.getFunctionLiteral()).source(expression);
}
@Override
@NotNull
public JsNode visitNamedFunction(@NotNull KtNamedFunction expression, @NotNull TranslationContext context) {
JsExpression alias = new LiteralFunctionTranslator(context).translate(expression);
FunctionDescriptor descriptor = getFunctionDescriptor(context.bindingContext(), expression);
JsNameRef nameRef = (JsNameRef) ReferenceTranslator.translateAsValueReference(descriptor, context);
assert nameRef.getName() != null;
if (InlineUtil.isInline(descriptor)) {
MetadataProperties.setStaticRef(nameRef.getName(), alias);
}
boolean isExpression = BindingContextUtilsKt.isUsedAsExpression(expression, context.bindingContext());
JsNode result = isExpression ? alias : JsAstUtils.newVar(nameRef.getName(), alias);
return result.source(expression);
}
@Override
@NotNull
public JsNode visitThisExpression(@NotNull KtThisExpression expression, @NotNull TranslationContext context) {
DeclarationDescriptor thisExpression =
getDescriptorForReferenceExpression(context.bindingContext(), expression.getInstanceReference());
assert thisExpression != null : "This expression must reference a descriptor: " + expression.getText();
return context.getDispatchReceiver(getReceiverParameterForDeclaration(thisExpression)).source(expression);
}
@Override
@NotNull
public JsNode visitArrayAccessExpression(@NotNull KtArrayAccessExpression expression,
@NotNull TranslationContext context) {
return AccessTranslationUtils.translateAsGet(expression, context);
}
@Override
@NotNull
public JsNode visitSuperExpression(@NotNull KtSuperExpression expression, @NotNull TranslationContext context) {
ResolvedCall resolvedCall = getResolvedCallWithAssert(expression, context.bindingContext());
return context.getDispatchReceiver((ReceiverParameterDescriptor) resolvedCall.getResultingDescriptor());
}
@Override
@NotNull
public JsNode visitForExpression(@NotNull KtForExpression expression,
@NotNull TranslationContext context) {
return LoopTranslator.translateForExpression(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitTryExpression(
@NotNull KtTryExpression expression,
@NotNull TranslationContext context
) {
return new TryTranslator(expression, context).translate();
}
@Override
@NotNull
public JsNode visitThrowExpression(@NotNull KtThrowExpression expression,
@NotNull TranslationContext context) {
KtExpression thrownExpression = expression.getThrownExpression();
assert thrownExpression != null : "Thrown expression must not be null";
return new JsThrow(translateAsExpression(thrownExpression, context)).source(expression);
}
@Override
@NotNull
public JsNode visitObjectLiteralExpression(@NotNull KtObjectLiteralExpression expression, @NotNull TranslationContext context) {
ClassDescriptor descriptor = BindingUtils.getClassDescriptor(context.bindingContext(), expression.getObjectDeclaration());
translateClassOrObject(expression.getObjectDeclaration(), descriptor, context);
JsExpression constructor = ReferenceTranslator.translateAsTypeReference(descriptor, context);
List closure = context.getClassOrConstructorClosure(descriptor);
List closureArgs = new ArrayList<>();
if (closure != null) {
for (DeclarationDescriptor capturedValue : closure) {
closureArgs.add(context.getArgumentForClosureConstructor(capturedValue));
if (capturedValue instanceof TypeParameterDescriptor) {
closureArgs.add(context.getTypeArgumentForClosureConstructor((TypeParameterDescriptor) capturedValue));
}
}
}
// In case of object expressions like this:
// object : SuperClass(A, B, ...)
// we may capture local variables in expressions A, B, etc. We don't want to generate local fields for these variables.
// Our ClassTranslator is capable of such thing, but case of object expression is a little special.
// Consider the following:
//
// class A(val x: Int) {
// fun foo() { object : A(x) }
//
// By calling A(x) super constructor we capture `this` explicitly. However, we can't tell which `A::this` we are mentioning,
// either `this` of an object literal or `this` of enclosing `class A`.
// Frontend treats it as `this` of enclosing class declaration, therefore it expects backend to generate
// super call in scope of `fun foo()` rather than define inner scope for object's constructor.
// Thus we generate this call here rather than relying on ClassTranslator.
ResolvedCall superCall = BindingUtils.getSuperCall(context.bindingContext(),
expression.getObjectDeclaration());
if (superCall != null) {
closureArgs.addAll(CallArgumentTranslator.translate(superCall, null, context).getTranslateArguments());
}
return new JsNew(constructor, closureArgs);
}
@Override
public JsNode visitAnnotatedExpression(@NotNull KtAnnotatedExpression expression, TranslationContext context) {
for (KtAnnotationEntry entry : expression.getAnnotationEntries()) {
AnnotationDescriptor descriptor = context.bindingContext().get(BindingContext.ANNOTATION, entry);
if (descriptor == null) continue;
ClassifierDescriptor classifierDescriptor = getAnnotationClass(descriptor);
if (classifierDescriptor == null) continue;
KotlinRetention retention = DescriptorUtilsKt.getAnnotationRetention(classifierDescriptor);
if (retention == KotlinRetention.SOURCE) {
KtExpression baseExpression = expression.getBaseExpression();
if (baseExpression == null) continue;
return baseExpression.accept(this, context);
}
}
return super.visitAnnotatedExpression(expression, context);
}
@Override
public JsNode visitClass(@NotNull KtClass klass, TranslationContext context) {
ClassDescriptor descriptor = BindingUtils.getClassDescriptor(context.bindingContext(), klass);
translateClassOrObject(klass, descriptor, context);
return JsEmpty.INSTANCE;
}
@Override
public JsNode visitTypeAlias(@NotNull KtTypeAlias typeAlias, TranslationContext data) {
// Resolved by front-end, not used by backend
return JsEmpty.INSTANCE;
}
private static void translateClassOrObject(
@NotNull KtClassOrObject declaration,
@NotNull ClassDescriptor descriptor,
@NotNull TranslationContext context
) {
TranslationContext classContext = context.innerWithUsageTracker(descriptor);
ClassTranslator.translate(declaration, classContext);
}
}
