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org.jetbrains.kotlin.js.translate.expression.ExpressionVisitor 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.js.translate.expression;
import com.google.dart.compiler.backend.js.ast.*;
import com.google.dart.compiler.backend.js.ast.metadata.MetadataProperties;
import com.google.dart.compiler.backend.js.ast.metadata.MetadataProperty;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
import org.jetbrains.kotlin.descriptors.VariableDescriptor;
import org.jetbrains.kotlin.js.translate.context.Namer;
import org.jetbrains.kotlin.js.translate.context.TranslationContext;
import org.jetbrains.kotlin.js.translate.declaration.ClassTranslator;
import org.jetbrains.kotlin.js.translate.expression.loopTranslator.LoopTranslator;
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.JsAstUtils;
import org.jetbrains.kotlin.js.translate.utils.TranslationUtils;
import org.jetbrains.kotlin.lexer.JetTokens;
import org.jetbrains.kotlin.psi.*;
import org.jetbrains.kotlin.resolve.BindingContext;
import org.jetbrains.kotlin.resolve.BindingContextUtils;
import org.jetbrains.kotlin.resolve.bindingContextUtil.BindingContextUtilPackage;
import org.jetbrains.kotlin.resolve.constants.CompileTimeConstant;
import org.jetbrains.kotlin.resolve.constants.ConstantValue;
import org.jetbrains.kotlin.resolve.constants.NullValue;
import org.jetbrains.kotlin.resolve.constants.evaluate.ConstantExpressionEvaluator;
import org.jetbrains.kotlin.resolve.inline.InlineUtil;
import org.jetbrains.kotlin.types.JetType;
import org.jetbrains.kotlin.types.TypeUtils;
import java.util.List;
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.reference.ReferenceTranslator.translateAsFQReference;
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.convertToStatement;
import static org.jetbrains.kotlin.js.translate.utils.JsAstUtils.newVar;
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.BindingContextUtils.isVarCapturedInClosure;
public final class ExpressionVisitor extends TranslatorVisitor {
@Override
protected JsNode emptyResult(@NotNull TranslationContext context) {
return context.getEmptyExpression();
}
@Override
@NotNull
public JsNode visitConstantExpression(@NotNull JetConstantExpression expression, @NotNull TranslationContext context) {
return translateConstantExpression(expression, context).source(expression);
}
@NotNull
private static JsNode translateConstantExpression(@NotNull JetConstantExpression expression, @NotNull TranslationContext context) {
CompileTimeConstant compileTimeValue = ConstantExpressionEvaluator.getConstant(expression, context.bindingContext());
assert compileTimeValue != null : message(expression, "Expression is not compile time value: " + expression.getText() + " ");
JetType expectedType = context.bindingContext().getType(expression);
ConstantValue constant = compileTimeValue.toConstantValue(expectedType != null ? expectedType : TypeUtils.NO_EXPECTED_TYPE);
if (constant instanceof NullValue) {
return JsLiteral.NULL;
}
Object value = constant.getValue();
if (value instanceof Integer || value instanceof Short || value instanceof Byte) {
return context.program().getNumberLiteral(((Number) value).intValue());
}
else if (value instanceof Long) {
return JsAstUtils.newLong((Long) value, context);
}
else if (value instanceof Number) {
return context.program().getNumberLiteral(((Number) value).doubleValue());
}
else if (value instanceof Boolean) {
return JsLiteral.getBoolean((Boolean) value);
}
//TODO: test
if (value instanceof String) {
return context.program().getStringLiteral((String) value);
}
if (value instanceof Character) {
return context.program().getStringLiteral(value.toString());
}
throw new AssertionError(message(expression, "Unsupported constant expression: " + expression.getText() + " "));
}
@Override
@NotNull
public JsNode visitBlockExpression(@NotNull JetBlockExpression jetBlock, @NotNull TranslationContext context) {
List statements = jetBlock.getStatements();
JsBlock jsBlock = new JsBlock();
for (JetExpression statement : statements) {
JsNode jsNode = Translation.translateExpression(statement, context, jsBlock);
JsStatement jsStatement = convertToStatement(jsNode);
if (!JsAstUtils.isEmptyStatement(jsStatement)) {
jsBlock.getStatements().add(jsStatement);
}
}
return jsBlock;
}
@Override
public JsNode visitMultiDeclaration(@NotNull JetMultiDeclaration multiDeclaration, @NotNull TranslationContext context) {
JetExpression jetInitializer = multiDeclaration.getInitializer();
assert jetInitializer != null : "Initializer for multi declaration must be not null";
JsExpression initializer = Translation.translateAsExpression(jetInitializer, context);
return MultiDeclarationTranslator.translate(multiDeclaration, context.scope().declareTemporary(), initializer, context);
}
@Override
@NotNull
public JsNode visitReturnExpression(@NotNull JetReturnExpression jetReturnExpression,
@NotNull TranslationContext context) {
JetExpression returned = jetReturnExpression.getReturnedExpression();
// TODO: add related descriptor to context and use it here
JetDeclarationWithBody parent = PsiTreeUtil.getParentOfType(jetReturnExpression, JetDeclarationWithBody.class);
if (parent instanceof JetSecondaryConstructor) {
return new JsReturn(new JsNameRef(Namer.ANOTHER_THIS_PARAMETER_NAME)).source(jetReturnExpression);
}
if (returned == null) {
return new JsReturn(null).source(jetReturnExpression);
}
JsExpression jsReturnExpression = translateAsExpression(returned, context);
if (JsAstUtils.isEmptyExpression(jsReturnExpression)) {
return context.getEmptyExpression();
}
return new JsReturn(jsReturnExpression).source(jetReturnExpression);
}
@Override
@NotNull
public JsNode visitParenthesizedExpression(@NotNull JetParenthesizedExpression expression,
@NotNull TranslationContext context) {
JetExpression expressionInside = expression.getExpression();
if (expressionInside != null) {
return Translation.translateExpression(expressionInside, context);
}
return JsEmpty.INSTANCE$;
}
@Override
@NotNull
public JsNode visitBinaryExpression(@NotNull JetBinaryExpression expression,
@NotNull TranslationContext context) {
return BinaryOperationTranslator.translate(expression, context);
}
@Override
@NotNull
// assume it is a local variable declaration
public JsNode visitProperty(@NotNull JetProperty expression, @NotNull TranslationContext context) {
VariableDescriptor descriptor = BindingContextUtils.getNotNull(context.bindingContext(), BindingContext.VARIABLE, expression);
JsExpression initializer = translateInitializerForProperty(expression, context);
if (initializer != null && JsAstUtils.isEmptyExpression(initializer)) {
return context.getEmptyExpression();
}
JsName name = context.getNameForDescriptor(descriptor);
if (isVarCapturedInClosure(context.bindingContext(), descriptor)) {
JsNameRef alias = getCapturedVarAccessor(name.makeRef());
initializer = JsAstUtils.wrapValue(alias, initializer == null ? JsLiteral.NULL : initializer);
}
return newVar(name, initializer).source(expression);
}
@Override
@NotNull
public JsNode visitCallableReferenceExpression(@NotNull JetCallableReferenceExpression expression, @NotNull TranslationContext context) {
return CallableReferenceTranslator.INSTANCE$.translate(expression, context);
}
@Override
@NotNull
public JsNode visitCallExpression(
@NotNull JetCallExpression expression,
@NotNull TranslationContext context
) {
return CallExpressionTranslator.translate(expression, null, context).source(expression);
}
@Override
@NotNull
public JsNode visitIfExpression(@NotNull JetIfExpression expression, @NotNull TranslationContext context) {
assert expression.getCondition() != null : "condition should not ne null: " + expression.getText();
JsExpression testExpression = Translation.translateAsExpression(expression.getCondition(), context);
if (JsAstUtils.isEmptyExpression(testExpression)) {
return testExpression;
}
boolean isKotlinExpression = BindingContextUtilPackage.isUsedAsExpression(expression, context.bindingContext());
JetExpression thenExpression = expression.getThen();
JetExpression elseExpression = expression.getElse();
JsStatement thenStatement =
thenExpression != null ? Translation.translateAsStatementAndMergeInBlockIfNeeded(thenExpression, context) : null;
JsStatement elseStatement =
elseExpression != null ? Translation.translateAsStatementAndMergeInBlockIfNeeded(elseExpression, context) : null;
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);
}
}
JsIf ifStatement = new JsIf(testExpression, thenStatement, elseStatement);
return ifStatement.source(expression);
}
@Override
@NotNull
public JsExpression visitSimpleNameExpression(@NotNull JetSimpleNameExpression expression,
@NotNull TranslationContext context) {
return ReferenceTranslator.translateSimpleNameWithQualifier(expression, null, context).source(expression);
}
@Override
@NotNull
public JsNode visitWhileExpression(@NotNull JetWhileExpression expression, @NotNull TranslationContext context) {
return LoopTranslator.createWhile(false, expression, context);
}
@Override
@NotNull
public JsNode visitDoWhileExpression(@NotNull JetDoWhileExpression expression, @NotNull TranslationContext context) {
return LoopTranslator.createWhile(true, expression, context);
}
@Override
@NotNull
public JsNode visitStringTemplateExpression(@NotNull JetStringTemplateExpression expression,
@NotNull TranslationContext context) {
JsStringLiteral stringLiteral = resolveAsStringConstant(expression, context);
if (stringLiteral != null) {
return stringLiteral;
}
return resolveAsTemplate(expression, context).source(expression);
}
@NotNull
private static JsNode resolveAsTemplate(@NotNull JetStringTemplateExpression expression,
@NotNull TranslationContext context) {
return StringTemplateTranslator.translate(expression, context);
}
@Nullable
private static JsStringLiteral resolveAsStringConstant(@NotNull JetExpression 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 context.program().getStringLiteral(constantString);
}
@Override
@NotNull
public JsNode visitDotQualifiedExpression(@NotNull JetDotQualifiedExpression expression,
@NotNull TranslationContext context) {
return QualifiedExpressionTranslator.translateQualifiedExpression(expression, context);
}
@Override
public JsNode visitLabeledExpression(
@NotNull JetLabeledExpression expression, TranslationContext context
) {
JetExpression baseExpression = expression.getBaseExpression();
assert baseExpression != null;
if (BindingContextUtilPackage.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);
JsStatement baseStatement = Translation.translateAsStatement(baseExpression, context);
functionScope.exitLabel();
return new JsLabel(labelName, baseStatement).source(expression);
}
@Override
@NotNull
public JsNode visitPrefixExpression(
@NotNull JetPrefixExpression expression,
@NotNull TranslationContext context
) {
return UnaryOperationTranslator.translate(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitPostfixExpression(@NotNull JetPostfixExpression expression,
@NotNull TranslationContext context) {
return UnaryOperationTranslator.translate(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitIsExpression(@NotNull JetIsExpression expression,
@NotNull TranslationContext context) {
return Translation.patternTranslator(context).translateIsExpression(expression);
}
@Override
@NotNull
public JsNode visitSafeQualifiedExpression(@NotNull JetSafeQualifiedExpression expression,
@NotNull TranslationContext context) {
return QualifiedExpressionTranslator.translateQualifiedExpression(expression, context).source(expression);
}
@Override
@Nullable
public JsNode visitWhenExpression(@NotNull JetWhenExpression expression,
@NotNull TranslationContext context) {
return WhenTranslator.translate(expression, context);
}
@Override
@NotNull
public JsNode visitBinaryWithTypeRHSExpression(@NotNull JetBinaryExpressionWithTypeRHS expression,
@NotNull TranslationContext context) {
JsExpression jsExpression = Translation.translateAsExpression(expression.getLeft(), context);
if (expression.getOperationReference().getReferencedNameElementType() != JetTokens.AS_KEYWORD)
return jsExpression.source(expression);
JetTypeReference right = expression.getRight();
assert right != null;
JetType rightType = BindingContextUtils.getNotNull(context.bindingContext(), BindingContext.TYPE, right);
JetType leftType = BindingContextUtils.getTypeNotNull(context.bindingContext(), expression.getLeft());
if (TypeUtils.isNullableType(rightType) || !TypeUtils.isNullableType(leftType)) {
return jsExpression.source(expression);
}
// KT-2670
// we actually do not care for types in js
return TranslationUtils.sure(jsExpression, context).source(expression);
}
private static String getReferencedName(JetSimpleNameExpression expression) {
return expression.getReferencedName()
.replaceAll("^@", "")
.replaceAll("(?:^`(.*)`$)", "$1");
}
private static JsNameRef getTargetLabel(JetExpressionWithLabel expression, TranslationContext context) {
JetSimpleNameExpression 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 JetBreakExpression expression,
@NotNull TranslationContext context) {
return new JsBreak(getTargetLabel(expression, context)).source(expression);
}
@Override
@NotNull
public JsNode visitContinueExpression(@NotNull JetContinueExpression expression,
@NotNull TranslationContext context) {
return new JsContinue(getTargetLabel(expression, context)).source(expression);
}
@Override
@NotNull
public JsNode visitFunctionLiteralExpression(@NotNull JetFunctionLiteralExpression expression, @NotNull TranslationContext context) {
return new LiteralFunctionTranslator(context).translate(expression.getFunctionLiteral());
}
@Override
@NotNull
public JsNode visitNamedFunction(@NotNull JetNamedFunction expression, @NotNull TranslationContext context) {
JsExpression alias = new LiteralFunctionTranslator(context).translate(expression);
FunctionDescriptor descriptor = getFunctionDescriptor(context.bindingContext(), expression);
JsName name = context.getNameForDescriptor(descriptor);
if (InlineUtil.isInline(descriptor)) {
MetadataProperties.setStaticRef(name, alias);
}
boolean isExpression = BindingContextUtilPackage.isUsedAsExpression(expression, context.bindingContext());
JsNode result = isExpression ? alias : JsAstUtils.newVar(name, alias);
return result.source(expression);
}
@Override
@NotNull
public JsNode visitThisExpression(@NotNull JetThisExpression 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 JetArrayAccessExpression expression,
@NotNull TranslationContext context) {
return AccessTranslationUtils.translateAsGet(expression, context);
}
@Override
@NotNull
public JsNode visitSuperExpression(@NotNull JetSuperExpression expression, @NotNull TranslationContext context) {
DeclarationDescriptor superClassDescriptor = context.bindingContext().get(BindingContext.REFERENCE_TARGET, expression.getInstanceReference());
assert superClassDescriptor != null: message(expression);
return translateAsFQReference(superClassDescriptor, context);
}
@Override
@NotNull
public JsNode visitForExpression(@NotNull JetForExpression expression,
@NotNull TranslationContext context) {
return LoopTranslator.translateForExpression(expression, context).source(expression);
}
@Override
@NotNull
public JsNode visitTryExpression(
@NotNull JetTryExpression expression,
@NotNull TranslationContext context
) {
return new TryTranslator(expression, context).translate();
}
@Override
@NotNull
public JsNode visitThrowExpression(@NotNull JetThrowExpression expression,
@NotNull TranslationContext context) {
JetExpression 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 JetObjectLiteralExpression expression,
@NotNull TranslationContext context) {
return ClassTranslator.generateObjectLiteral(expression.getObjectDeclaration(), context);
}
@Override
@NotNull
public JsNode visitObjectDeclaration(@NotNull JetObjectDeclaration expression,
@NotNull TranslationContext context) {
DeclarationDescriptor descriptor = getDescriptorForElement(context.bindingContext(), expression);
JsName name = context.getNameForDescriptor(descriptor);
JsExpression value = ClassTranslator.generateClassCreation(expression, context);
return newVar(name, value).source(expression);
}
}
