| /* |
| * Copyright 2003-2006 Dave Griffith, Bas Leijdekkers |
| * |
| * 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.siyeh.ipp.chartostring; |
| |
| import com.intellij.openapi.util.text.StringUtil; |
| import com.intellij.psi.*; |
| import com.intellij.psi.tree.IElementType; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import org.jetbrains.annotations.NonNls; |
| |
| import static com.intellij.psi.CommonClassNames.JAVA_LANG_STRING; |
| |
| class CharToStringPredicate implements PsiElementPredicate { |
| |
| public boolean satisfiedBy(PsiElement element) { |
| if (!(element instanceof PsiLiteralExpression)) { |
| return false; |
| } |
| final PsiLiteralExpression expression = |
| (PsiLiteralExpression)element; |
| final PsiType type = expression.getType(); |
| if (!PsiType.CHAR.equals(type)) { |
| return false; |
| } |
| final String charLiteral = element.getText(); |
| if (charLiteral.length() < 2) return false; // Incomplete char literal probably without closing amp |
| |
| final String charText = |
| charLiteral.substring(1, charLiteral.length() - 1); |
| if (StringUtil.unescapeStringCharacters(charText).length() != 1) { |
| // not satisfied with character literals of more than one character |
| return false; |
| } |
| return isInConcatenationContext(expression); |
| } |
| |
| private static boolean isInConcatenationContext(PsiElement element) { |
| final PsiElement parent = element.getParent(); |
| if (parent instanceof PsiPolyadicExpression) { |
| final PsiPolyadicExpression parentExpression = |
| (PsiPolyadicExpression)parent; |
| final PsiType parentType = parentExpression.getType(); |
| if (parentType == null) { |
| return false; |
| } |
| final String parentTypeText = parentType.getCanonicalText(); |
| return JAVA_LANG_STRING.equals(parentTypeText); |
| } |
| else if (parent instanceof PsiAssignmentExpression) { |
| final PsiAssignmentExpression parentExpression = |
| (PsiAssignmentExpression)parent; |
| final IElementType tokenType = parentExpression.getOperationTokenType(); |
| if (!JavaTokenType.PLUSEQ.equals(tokenType)) { |
| return false; |
| } |
| final PsiType parentType = parentExpression.getType(); |
| if (parentType == null) { |
| return false; |
| } |
| final String parentTypeText = parentType.getCanonicalText(); |
| return JAVA_LANG_STRING.equals(parentTypeText); |
| } |
| else if (parent instanceof PsiExpressionList) { |
| final PsiElement grandParent = parent.getParent(); |
| if (!(grandParent instanceof PsiMethodCallExpression)) { |
| return false; |
| } |
| final PsiMethodCallExpression methodCall = |
| (PsiMethodCallExpression)grandParent; |
| final PsiReferenceExpression methodExpression = |
| methodCall.getMethodExpression(); |
| final PsiExpression qualifierExpression = |
| methodExpression.getQualifierExpression(); |
| final PsiType type; |
| if (qualifierExpression == null) { |
| // to use the intention inside the source of |
| // String and StringBuffer |
| type = methodExpression.getType(); |
| } |
| else { |
| type = qualifierExpression.getType(); |
| } |
| if (type == null) { |
| return false; |
| } |
| final String className = type.getCanonicalText(); |
| if (CommonClassNames.JAVA_LANG_STRING_BUFFER.equals(className) || |
| CommonClassNames.JAVA_LANG_STRING_BUILDER.equals(className)) { |
| @NonNls final String methodName = |
| methodExpression.getReferenceName(); |
| if (!"append".equals(methodName) && |
| !"insert".equals(methodName)) { |
| return false; |
| } |
| final PsiElement method = methodExpression.resolve(); |
| return method != null; |
| } |
| else if (JAVA_LANG_STRING.equals(className)) { |
| @NonNls final String methodName = |
| methodExpression.getReferenceName(); |
| if (!"indexOf".equals(methodName) && |
| !"lastIndexOf".equals(methodName) && |
| !"replace".equals(methodName)) { |
| return false; |
| } |
| final PsiElement method = methodExpression.resolve(); |
| return method != null; |
| } |
| } |
| return false; |
| } |
| } |