001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.jet.lang.psi;
018    
019    import com.intellij.lang.ASTNode;
020    import com.intellij.psi.ElementManipulators;
021    import com.intellij.psi.LiteralTextEscaper;
022    import com.intellij.psi.PsiLanguageInjectionHost;
023    import com.intellij.psi.tree.TokenSet;
024    import org.jetbrains.annotations.NotNull;
025    import org.jetbrains.jet.JetNodeTypes;
026    import org.jetbrains.jet.lexer.JetTokens;
027    
028    
029    public class JetStringTemplateExpression extends JetExpressionImpl implements PsiLanguageInjectionHost {
030        private static final TokenSet TOKENS_SUITABLE_FOR_INJECTION = TokenSet.create(JetNodeTypes.LITERAL_STRING_TEMPLATE_ENTRY, JetNodeTypes.ESCAPE_STRING_TEMPLATE_ENTRY);
031    
032        public JetStringTemplateExpression(@NotNull ASTNode node) {
033            super(node);
034        }
035    
036        @Override
037        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
038            return visitor.visitStringTemplateExpression(this, data);
039        }
040    
041        @NotNull
042        public JetStringTemplateEntry[] getEntries() {
043            return findChildrenByClass(JetStringTemplateEntry.class);
044        }
045    
046        @Override
047        public boolean isValidHost() {
048            ASTNode node = getNode();
049            ASTNode child = node.getFirstChildNode().getTreeNext();
050            while (child != null) {
051                if (child.getElementType() == JetTokens.CLOSING_QUOTE) return true;
052                if (!TOKENS_SUITABLE_FOR_INJECTION.contains(child.getElementType())) return false;
053                child = child.getTreeNext();
054            }
055            return false;
056        }
057    
058        @Override
059        public PsiLanguageInjectionHost updateText(@NotNull String text) {
060            return ElementManipulators.handleContentChange(this, text);
061        }
062    
063        @NotNull
064        @Override
065        public LiteralTextEscaper<? extends PsiLanguageInjectionHost> createLiteralTextEscaper() {
066            return new KotlinStringLiteralTextEscaper(this);
067        }
068    }