diff options
Diffstat (limited to 'velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTIfStatement.java')
| -rw-r--r-- | velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTIfStatement.java | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTIfStatement.java b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTIfStatement.java new file mode 100644 index 00000000..b1b1bb66 --- /dev/null +++ b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTIfStatement.java @@ -0,0 +1,216 @@ +package org.apache.velocity.runtime.parser.node; + +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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. + */ + + +import org.apache.velocity.context.InternalContextAdapter; +import org.apache.velocity.exception.MethodInvocationException; +import org.apache.velocity.exception.ParseErrorException; +import org.apache.velocity.exception.ResourceNotFoundException; +import org.apache.velocity.exception.TemplateInitException; +import org.apache.velocity.runtime.RuntimeConstants.SpaceGobbling; +import org.apache.velocity.runtime.parser.Parser; +import org.apache.velocity.runtime.parser.Token; + +import java.io.IOException; +import java.io.Writer; + + +/** + * Please look at the Parser.jjt file which is + * what controls the generation of this class. + * + * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> + * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> + * @version $Id$ + */ +public class ASTIfStatement extends SimpleNode +{ + private String prefix = ""; + private String postfix = ""; + + /* + * '#' and '$' prefix characters eaten by javacc MORE mode + */ + private String morePrefix = ""; + + /** + * @param id + */ + public ASTIfStatement(int id) + { + super(id); + } + + /** + * @param p + * @param id + */ + public ASTIfStatement(Parser p, int id) + { + super(p, id); + } + + /** + * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object) + */ + @Override + public Object jjtAccept(ParserVisitor visitor, Object data) + { + return visitor.visit(this, data); + } + + /** + * @throws TemplateInitException + * @see org.apache.velocity.runtime.parser.node.Node#init(org.apache.velocity.context.InternalContextAdapter, java.lang.Object) + */ + @Override + public Object init(InternalContextAdapter context, Object data) throws TemplateInitException + { + Object obj = super.init(context, data); + + /* + * handle '$' and '#' chars prefix + */ + Token t = getFirstToken(); + int pos = -1; + while (t != null && (pos = t.image.lastIndexOf(rsvc.getParserConfiguration().getHashChar())) == -1) + { + t = t.next; + } + if (t != null && pos > 0) + { + morePrefix = t.image.substring(0, pos); + } + + /* handle structured space gobbling */ + if (rsvc.getSpaceGobbling() == SpaceGobbling.STRUCTURED && postfix.length() > 0) + { + NodeUtils.fixIndentation(this, prefix); + } + + cleanupParserAndTokens(); // drop reference to Parser and all JavaCC Tokens + return obj; + } + + /** + * set indentation prefix + * @param prefix + */ + public void setPrefix(String prefix) + { + this.prefix = prefix; + } + + /** + * get indentation prefix + * @return prefix + */ + public String getPrefix() + { + return prefix; + } + + /** + * set indentation postfix + * @param postfix + */ + public void setPostfix(String postfix) + { + this.postfix = postfix; + } + + /** + * get indentation postfix + * @return postfix + */ + public String getPostfix() + { + return postfix; + } + + /** + * @see org.apache.velocity.runtime.parser.node.SimpleNode#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer) + */ + @Override + public boolean render(InternalContextAdapter context, Writer writer) + throws IOException,MethodInvocationException, + ResourceNotFoundException, ParseErrorException + { + SpaceGobbling spaceGobbling = rsvc.getSpaceGobbling(); + + if (morePrefix.length() > 0 || spaceGobbling.compareTo(SpaceGobbling.LINES) < 0) + { + writer.write(prefix); + } + + writer.write(morePrefix); + + /* + * Check if the #if(expression) construct evaluates to true: + */ + if (jjtGetChild(0).evaluate(context)) + { + jjtGetChild(1).render(context, writer); + } + else + { + int totalNodes = jjtGetNumChildren(); + + /* + * Now check the remaining nodes left in the + * if construct. The nodes are either elseif + * nodes or else nodes. Each of these node + * types knows how to evaluate themselves. If + * a node evaluates to true then the node will + * render itself and this method will return + * as there is nothing left to do. + */ + for (int i = 2; i < totalNodes; i++) + { + if (jjtGetChild(i).evaluate(context)) + { + jjtGetChild(i).render(context, writer); + break; + } + } + } + + if (morePrefix.length() > 0 || spaceGobbling == SpaceGobbling.NONE) + { + writer.write(postfix); + } + + /* + * This is reached without rendering anything (other than potential suffix/prefix) when an ASTIfStatement + * consists of an if/elseif sequence where none of the nodes evaluate to true. + */ + + return true; + } + + /** + * @param context + * @param visitor + */ + public void process( InternalContextAdapter context, ParserVisitor visitor) + { + } +} |