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/*
* Copyright 2000-2013 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 com.jetbrains.python.psi.impl;
import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiPolyVariantReference;
import com.intellij.psi.PsiReference;
import com.intellij.psi.util.QualifiedName;
import com.jetbrains.python.PyElementTypes;
import com.jetbrains.python.PyNames;
import com.jetbrains.python.PyTokenTypes;
import com.jetbrains.python.PythonDialectsTokenSetProvider;
import com.jetbrains.python.psi.*;
import com.jetbrains.python.psi.impl.references.PyOperatorReference;
import com.jetbrains.python.psi.resolve.PyResolveContext;
import com.jetbrains.python.psi.types.PyType;
import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author yole
*/
public class PyPrefixExpressionImpl extends PyElementImpl implements PyPrefixExpression {
public PyPrefixExpressionImpl(ASTNode astNode) {
super(astNode);
}
@Override
public PyExpression getOperand() {
return (PyExpression)childToPsi(PythonDialectsTokenSetProvider.INSTANCE.getExpressionTokens(), 0);
}
@Nullable
public PsiElement getPsiOperator() {
final ASTNode node = getNode();
final ASTNode child = node.findChildByType(PyElementTypes.UNARY_OPS);
return child != null ? child.getPsi() : null;
}
@NotNull
@Override
public PyElementType getOperator() {
final PsiElement op = getPsiOperator();
assert op != null;
return (PyElementType)op.getNode().getElementType();
}
@Override
protected void acceptPyVisitor(PyElementVisitor pyVisitor) {
pyVisitor.visitPyPrefixExpression(this);
}
@Override
public PsiReference getReference() {
return getReference(PyResolveContext.noImplicits());
}
@Override
public PsiPolyVariantReference getReference(PyResolveContext context) {
final PyElementType t = getOperator();
if (t.getSpecialMethodName() != null) {
return new PyOperatorReference(this, context);
}
return null;
}
@Override
public PyType getType(@NotNull TypeEvalContext context, @NotNull TypeEvalContext.Key key) {
if (getOperator() == PyTokenTypes.NOT_KEYWORD) {
return PyBuiltinCache.getInstance(this).getBoolType();
}
final PsiReference ref = getReference(PyResolveContext.noImplicits().withTypeEvalContext(context));
if (ref != null) {
final PsiElement resolved = ref.resolve();
if (resolved instanceof Callable) {
return ((Callable)resolved).getCallType(context, this);
}
}
return null;
}
@Override
public PyExpression getQualifier() {
return getOperand();
}
@Nullable
@Override
public QualifiedName asQualifiedName() {
return PyPsiUtils.asQualifiedName(this);
}
@Override
public boolean isQualified() {
return getQualifier() != null;
}
@Override
public String getReferencedName() {
PyElementType t = getOperator();
if (t == PyTokenTypes.PLUS) {
return PyNames.POS;
}
else if (t == PyTokenTypes.MINUS) {
return PyNames.NEG;
}
return getOperator().getSpecialMethodName();
}
@Override
public ASTNode getNameElement() {
final PsiElement op = getPsiOperator();
return op != null ? op.getNode() : null;
}
}
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