| /* |
| * 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.codeInsight.intentions; |
| |
| import com.intellij.codeInsight.intention.impl.BaseIntentionAction; |
| import com.intellij.openapi.editor.Editor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiFile; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import com.jetbrains.python.PyBundle; |
| import com.jetbrains.python.psi.*; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * @author vlan |
| */ |
| public class PyYieldFromIntention extends BaseIntentionAction { |
| @NotNull |
| @Override |
| public String getFamilyName() { |
| return PyBundle.message("INTN.yield.from"); |
| } |
| |
| @NotNull |
| @Override |
| public String getText() { |
| return PyBundle.message("INTN.yield.from"); |
| } |
| |
| @Override |
| public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file) { |
| if (LanguageLevel.forElement(file).isAtLeast(LanguageLevel.PYTHON33)) { |
| final PyForStatement forLoop = findForStatementAtCaret(editor, file); |
| if (forLoop != null) { |
| final PyTargetExpression forTarget = findSingleForLoopTarget(forLoop); |
| final PyReferenceExpression yieldValue = findSingleYieldValue(forLoop); |
| if (forTarget != null && yieldValue != null) { |
| final String targetName = forTarget.getName(); |
| if (targetName != null && targetName.equals(yieldValue.getName())) { |
| return true; |
| } |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void invoke(@NotNull Project project, Editor editor, PsiFile file) throws IncorrectOperationException { |
| final PyForStatement forLoop = findForStatementAtCaret(editor, file); |
| if (forLoop != null) { |
| final PyExpression source = forLoop.getForPart().getSource(); |
| if (source != null) { |
| final PyElementGenerator generator = PyElementGenerator.getInstance(project); |
| final String text = "yield from foo"; |
| final PyExpressionStatement exprStmt = generator.createFromText(LanguageLevel.forElement(file), PyExpressionStatement.class, text); |
| final PyExpression expr = exprStmt.getExpression(); |
| if (expr instanceof PyYieldExpression) { |
| final PyExpression yieldValue = ((PyYieldExpression)expr).getExpression(); |
| if (yieldValue != null) { |
| yieldValue.replace(source); |
| forLoop.replace(exprStmt); |
| } |
| } |
| } |
| } |
| } |
| |
| @Nullable |
| private static PyForStatement findForStatementAtCaret(@NotNull Editor editor, @NotNull PsiFile file) { |
| final PsiElement elementAtCaret = file.findElementAt(editor.getCaretModel().getOffset()); |
| return PsiTreeUtil.getParentOfType(elementAtCaret, PyForStatement.class); |
| } |
| |
| @Nullable |
| private static PyTargetExpression findSingleForLoopTarget(@NotNull PyForStatement forLoop) { |
| final PyForPart forPart = forLoop.getForPart(); |
| final PyExpression forTarget = forPart.getTarget(); |
| if (forTarget instanceof PyTargetExpression) { |
| return (PyTargetExpression)forTarget; |
| } |
| return null; |
| } |
| |
| @Nullable |
| private static PyReferenceExpression findSingleYieldValue(@NotNull PyForStatement forLoop) { |
| final PyForPart forPart = forLoop.getForPart(); |
| final PyStatementList stmtList = forPart.getStatementList(); |
| if (stmtList != null && forLoop.getElsePart() == null) { |
| final PyStatement[] statements = stmtList.getStatements(); |
| if (statements.length == 1) { |
| final PyStatement firstStmt = statements[0]; |
| if (firstStmt instanceof PyExpressionStatement) { |
| final PyExpression firstExpr = ((PyExpressionStatement)firstStmt).getExpression(); |
| if (firstExpr instanceof PyYieldExpression) { |
| final PyYieldExpression yieldExpr = (PyYieldExpression)firstExpr; |
| final PyExpression yieldValue = yieldExpr.getExpression(); |
| if (yieldValue instanceof PyReferenceExpression) { |
| return (PyReferenceExpression)yieldValue; |
| } |
| } |
| } |
| } |
| } |
| return null; |
| } |
| } |