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/*
* Copyright (C) 2010-2021 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.eclipse.handlers;
import static lombok.core.handlers.HandlerUtil.handleFlagUsage;
import static lombok.eclipse.handlers.EclipseHandlerUtil.typeMatches;
import lombok.ConfigurationKeys;
import lombok.val;
import lombok.var;
import lombok.core.HandlerPriority;
import lombok.eclipse.DeferUntilPostDiet;
import lombok.eclipse.EclipseASTAdapter;
import lombok.eclipse.EclipseASTVisitor;
import lombok.eclipse.EclipseNode;
import lombok.spi.Provides;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.ArrayInitializer;
import org.eclipse.jdt.internal.compiler.ast.ForStatement;
import org.eclipse.jdt.internal.compiler.ast.ForeachStatement;
import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
import org.eclipse.jdt.internal.compiler.ast.NullLiteral;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
/*
* This class just handles 3 basic error cases. The real meat of eclipse 'val' support is in {@code PatchVal} and {@code PatchValEclipse}
*/
@Provides(EclipseASTVisitor.class)
@DeferUntilPostDiet
@HandlerPriority(65536) // 2^16; resolution needs to work, so if the RHS expression is i.e. a call to a generated getter, we have to run after that getter has been generated.
public class HandleVal extends EclipseASTAdapter {
@Override public void visitLocal(EclipseNode localNode, LocalDeclaration local) {
TypeReference type = local.type;
boolean isVal = typeMatches(val.class, localNode, type);
boolean isVar = typeMatches(var.class, localNode, type);
if (!(isVal || isVar)) return;
if (isVal) handleFlagUsage(localNode, ConfigurationKeys.VAL_FLAG_USAGE, "val");
if (isVar) handleFlagUsage(localNode, ConfigurationKeys.VAR_FLAG_USAGE, "var");
boolean variableOfForEach = false;
if (localNode.directUp().get() instanceof ForeachStatement) {
ForeachStatement fs = (ForeachStatement) localNode.directUp().get();
variableOfForEach = fs.elementVariable == local;
}
String annotation = isVal ? "val" : "var";
if (local.initialization == null && !variableOfForEach) {
localNode.addError("'" + annotation + "' on a local variable requires an initializer expression");
return;
}
if (local.initialization instanceof ArrayInitializer) {
localNode.addError("'" + annotation + "' is not compatible with array initializer expressions. Use the full form (new int[] { ... } instead of just { ... })");
return;
}
ASTNode parentRaw = localNode.directUp().get();
if (isVal && parentRaw instanceof ForStatement) {
localNode.addError("'val' is not allowed in old-style for loops");
return;
}
if (parentRaw instanceof ForStatement && ((ForStatement) parentRaw).initializations != null && ((ForStatement) parentRaw).initializations.length > 1) {
localNode.addError("'var' is not allowed in old-style for loops if there is more than 1 initializer");
return;
}
if (local.initialization != null && local.initialization.getClass().getName().equals("org.eclipse.jdt.internal.compiler.ast.LambdaExpression")) {
localNode.addError("'" + annotation + "' is not allowed with lambda expressions.");
return;
}
if(isVar && local.initialization instanceof NullLiteral) {
localNode.addError("variable initializer is 'null'");
return;
}
}
}
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