/*
* Copyright 2011 Jon S Akhtar (Sylvanaar)
*
* 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 com.sylvanaar.idea.Lua.editor.inspections.unassignedVariable;
import com.intellij.codeHighlighting.HighlightDisplayLevel;
import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiElementVisitor;
import com.intellij.psi.PsiFile;
import com.sylvanaar.idea.Lua.editor.inspections.AbstractInspection;
import com.sylvanaar.idea.Lua.lang.psi.LuaControlFlowOwner;
import com.sylvanaar.idea.Lua.lang.psi.LuaPsiFile;
import com.sylvanaar.idea.Lua.lang.psi.LuaReferenceElement;
import com.sylvanaar.idea.Lua.lang.psi.controlFlow.ControlFlowUtil;
import com.sylvanaar.idea.Lua.lang.psi.controlFlow.Instruction;
import com.sylvanaar.idea.Lua.lang.psi.controlFlow.ReadWriteVariableInstruction;
import com.sylvanaar.idea.Lua.lang.psi.symbols.LuaGlobal;
import com.sylvanaar.idea.Lua.lang.psi.visitor.LuaElementVisitor;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;
/**
* @author ven
*/
public class UnassignedVariableAccessInspection extends AbstractInspection {
@Nls
@NotNull
@Override
public String getDisplayName() {
return "Variable not assigned";
}
@Override
public String getStaticDescription() {
return "Variable is read from without being assigned to.";
}
@NotNull
@Override
public String getGroupDisplayName() {
return PROBABLE_BUGS;
}
@NotNull
@Override
public HighlightDisplayLevel getDefaultLevel() {
return HighlightDisplayLevel.WARNING;
}
@Override
public boolean isEnabledByDefault() {
return false;
}
@NotNull
@Override
public PsiElementVisitor buildVisitor(@NotNull final ProblemsHolder holder, boolean isOnTheFly) {
return new LuaElementVisitor() {
// @Override
// public void visitBlock(LuaBlock e) {
// super.visitBlock(e);
//
// check(e, holder);
// }
@Override
public void visitFile(PsiFile file) {
super.visitFile(file);
if (! (file instanceof LuaPsiFile))
return;
check((LuaControlFlowOwner) file, holder);
}
};
}
protected void check(LuaControlFlowOwner owner, ProblemsHolder problemsHolder) {
Instruction[] flow = owner.getControlFlow();
ReadWriteVariableInstruction[] reads = ControlFlowUtil.getReadsWithoutPriorWrites(flow);
for (ReadWriteVariableInstruction read : reads) {
PsiElement element = read.getElement();
if (element instanceof LuaReferenceElement) {
if (((LuaReferenceElement) element).getElement() instanceof LuaGlobal)
if (((LuaReferenceElement) element).multiResolve(false).length == 0) {
problemsHolder.registerProblem(element, "Unassigned variable usage",
ProblemHighlightType.GENERIC_ERROR_OR_WARNING);
}
}
}
}
}