125 lines
3.7 KiB
Java
125 lines
3.7 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.jasper.compiler;
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import org.apache.jasper.JasperException;
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import org.apache.jasper.Options;
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/**
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*/
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public class TextOptimizer {
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/**
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* A visitor to concatenate contiguous template texts.
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*/
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private static class TextCatVisitor extends Node.Visitor {
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private static final String EMPTY_TEXT = "";
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private final Options options;
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private final PageInfo pageInfo;
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private int textNodeCount = 0;
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private Node.TemplateText firstTextNode = null;
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private StringBuilder textBuffer;
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public TextCatVisitor(Compiler compiler) {
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options = compiler.getCompilationContext().getOptions();
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pageInfo = compiler.getPageInfo();
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}
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@Override
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public void doVisit(Node n) throws JasperException {
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collectText();
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}
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/*
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* The following directives are ignored in text concatenation
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*/
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@Override
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public void visit(Node.PageDirective n) throws JasperException {
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}
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@Override
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public void visit(Node.TagDirective n) throws JasperException {
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}
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@Override
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public void visit(Node.TaglibDirective n) throws JasperException {
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}
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@Override
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public void visit(Node.AttributeDirective n) throws JasperException {
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}
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@Override
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public void visit(Node.VariableDirective n) throws JasperException {
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}
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/*
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* Don't concatenate text across body boundaries
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*/
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@Override
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public void visitBody(Node n) throws JasperException {
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super.visitBody(n);
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collectText();
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}
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@Override
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public void visit(Node.TemplateText n) throws JasperException {
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if ((options.getTrimSpaces() || pageInfo.isTrimDirectiveWhitespaces())
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&& n.isAllSpace()) {
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n.setText(EMPTY_TEXT);
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return;
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}
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if (textNodeCount++ == 0) {
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firstTextNode = n;
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textBuffer = new StringBuilder(n.getText());
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} else {
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// Append text to text buffer
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textBuffer.append(n.getText());
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n.setText(EMPTY_TEXT);
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}
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}
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/**
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* This method breaks concatenation mode. As a side effect it copies
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* the concatenated string to the first text node
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*/
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private void collectText() {
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if (textNodeCount > 1) {
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// Copy the text in buffer into the first template text node.
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firstTextNode.setText(textBuffer.toString());
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}
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textNodeCount = 0;
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}
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}
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public static void concatenate(Compiler compiler, Node.Nodes page)
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throws JasperException {
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TextCatVisitor v = new TextCatVisitor(compiler);
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page.visit(v);
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// Cleanup, in case the page ends with a template text
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v.collectText();
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}
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}
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