| /* |
| * 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.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.*; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * @author yole |
| */ |
| public class PySubscriptionExpressionImpl extends PyElementImpl implements PySubscriptionExpression { |
| public PySubscriptionExpressionImpl(ASTNode astNode) { |
| super(astNode); |
| } |
| |
| @NotNull |
| public PyExpression getOperand() { |
| return childToPsiNotNull(PythonDialectsTokenSetProvider.INSTANCE.getExpressionTokens(), 0); |
| } |
| |
| @NotNull |
| @Override |
| public PyExpression getRootOperand() { |
| PyExpression operand = getOperand(); |
| while (operand instanceof PySubscriptionExpression) { |
| operand = ((PySubscriptionExpression)operand).getOperand(); |
| } |
| return operand; |
| } |
| |
| @Nullable |
| public PyExpression getIndexExpression() { |
| return childToPsi(PythonDialectsTokenSetProvider.INSTANCE.getExpressionTokens(), 1); |
| } |
| |
| @Override |
| protected void acceptPyVisitor(final PyElementVisitor pyVisitor) { |
| pyVisitor.visitPySubscriptionExpression(this); |
| } |
| |
| @Nullable |
| @Override |
| public PyType getType(@NotNull TypeEvalContext context, @NotNull TypeEvalContext.Key key) { |
| PyType res = null; |
| final PsiReference ref = getReference(PyResolveContext.noImplicits().withTypeEvalContext(context)); |
| final PsiElement resolved = ref.resolve(); |
| if (resolved instanceof Callable) { |
| res = ((Callable)resolved).getCallType(context, this); |
| } |
| if (PyTypeChecker.isUnknown(res) || res instanceof PyNoneType) { |
| final PyExpression indexExpression = getIndexExpression(); |
| if (indexExpression != null) { |
| final PyType type = context.getType(getOperand()); |
| final PyClass cls = (type instanceof PyClassType) ? ((PyClassType)type).getPyClass() : null; |
| if (cls != null && PyABCUtil.isSubclass(cls, PyNames.MAPPING)) { |
| return res; |
| } |
| if (type instanceof PySubscriptableType) { |
| res = ((PySubscriptableType)type).getElementType(indexExpression, context); |
| } |
| else if (type instanceof PyCollectionType) { |
| res = ((PyCollectionType)type).getElementType(context); |
| } |
| } |
| } |
| return res; |
| } |
| |
| @Override |
| public PsiReference getReference() { |
| return getReference(PyResolveContext.noImplicits()); |
| } |
| |
| @NotNull |
| @Override |
| public PsiPolyVariantReference getReference(PyResolveContext context) { |
| return new PyOperatorReference(this, context); |
| } |
| |
| @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() { |
| String res = PyNames.GETITEM; |
| switch (AccessDirection.of(this)) { |
| case READ: |
| res = PyNames.GETITEM; |
| break; |
| case WRITE: |
| res = PyNames.SETITEM; |
| break; |
| case DELETE: |
| res = PyNames.DELITEM; |
| break; |
| } |
| return res; |
| } |
| |
| @Override |
| public ASTNode getNameElement() { |
| return getNode().findChildByType(PyTokenTypes.LBRACKET); |
| } |
| } |