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/*
* Copyright © 2010 Reinier Zwitserloot and Roel Spilker.
*
* 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.javac.handlers;
import lombok.javac.JavacASTAdapter;
import lombok.javac.JavacASTVisitor;
import lombok.javac.JavacNode;
import lombok.javac.JavacResolution;
import org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCEnhancedForLoop;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCNewArray;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
@ProviderFor(JavacASTVisitor.class)
public class HandleVal extends JavacASTAdapter {
@Override public boolean isResolutionBased() {
return true;
}
@Override public void visitLocal(JavacNode localNode, JCVariableDecl local) {
if (local.vartype != null && local.vartype.toString().equals("val")) {
JCExpression rhsOfEnhancedForLoop = null;
if (local.init == null) {
JCTree parentRaw = localNode.directUp().get();
if (parentRaw instanceof JCEnhancedForLoop) {
JCEnhancedForLoop efl = (JCEnhancedForLoop) parentRaw;
if (efl.var == local) rhsOfEnhancedForLoop = efl.expr;
}
}
if (rhsOfEnhancedForLoop == null && local.init == null) {
localNode.addError("'val' on a local variable requires an initializer expression");
return;
}
if (local.init instanceof JCNewArray && ((JCNewArray)local.init).elemtype == null) {
localNode.addError("'val' is not compatible with array initializer expressions. Use the full form (new int[] { ... } instead of just { ... })");
return;
}
local.mods.flags |= Flags.FINAL;
JCExpression oldVarType = local.vartype;
local.vartype = JavacResolution.createJavaLangObject(localNode.getTreeMaker(), localNode.getAst());
Type type;
try {
if (rhsOfEnhancedForLoop == null) {
if (local.init.type == null) {
JavacResolution resolver = new JavacResolution(localNode.getContext());
type = ((JCExpression) resolver.resolve(localNode).get(local.init)).type;
} else {
type = local.init.type;
}
} else {
if (rhsOfEnhancedForLoop.type == null) {
JavacResolution resolver = new JavacResolution(localNode.getContext());
type = ((JCExpression) resolver.resolve(localNode.directUp()).get(rhsOfEnhancedForLoop)).type;
} else {
type = rhsOfEnhancedForLoop.type;
}
}
try {
JCExpression replacement;
if (rhsOfEnhancedForLoop != null) {
localNode.addError("For now 'val' cannot be used in enhanced for loops. Fixing this is a high priority lombok issue though!");
return;
// TODO: Fix enhanced for loops - then uncomment a bunch of lines in test/transform/resource/*/ValInFor.java
}
replacement = JavacResolution.typeToJCTree(type, localNode.getTreeMaker(), localNode.getAst());
if (replacement != null) {
local.vartype = replacement;
localNode.getAst().setChanged();
}
else local.vartype = oldVarType;
} catch (JavacResolution.TypeNotConvertibleException e) {
localNode.addError("Cannot use 'val' here because initializer expression does not have a representable type: " + e.getMessage());
local.vartype = oldVarType;
}
} catch (RuntimeException e) {
local.vartype = oldVarType;
throw e;
}
}
// TODO search for val decls in either kind of for.
}
}
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