HtmlCompressorDirective.java
- /*
- * Copyright 2009-2022 the original author or authors.
- *
- * 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.googlecode.htmlcompressor.velocity;
- import com.google.javascript.jscomp.CompilationLevel;
- import com.googlecode.htmlcompressor.compressor.ClosureJavaScriptCompressor;
- import com.googlecode.htmlcompressor.compressor.HtmlCompressor;
- import java.io.IOException;
- import java.io.StringWriter;
- import java.io.Writer;
- import org.apache.velocity.context.InternalContextAdapter;
- import org.apache.velocity.exception.MethodInvocationException;
- import org.apache.velocity.exception.TemplateInitException;
- import org.apache.velocity.runtime.RuntimeServices;
- import org.apache.velocity.runtime.directive.Directive;
- import org.apache.velocity.runtime.parser.node.Node;
- /**
- * Velocity directive that compresses an HTML content within #compressHtml ... #end block. Compression parameters are
- * set by default (no JavaScript and CSS compression).
- *
- * @author <a href="mailto:serg472@gmail.com">Sergiy Kovalchuk</a>
- *
- * @see HtmlCompressor
- */
- public class HtmlCompressorDirective extends Directive {
- /** The Constant htmlCompressor. */
- private static final HtmlCompressor htmlCompressor = new HtmlCompressor();
- @Override
- public String getName() {
- return "compressHtml";
- }
- @Override
- public int getType() {
- return BLOCK;
- }
- @Override
- public void init(RuntimeServices rs, InternalContextAdapter context, Node node) throws TemplateInitException {
- super.init(rs, context, node);
- log = rs.getLog();
- boolean compressJavaScript = rs.getBoolean("userdirective.compressHtml.compressJavaScript", false);
- // set compressor properties
- htmlCompressor.setEnabled(rs.getBoolean("userdirective.compressHtml.enabled", true));
- htmlCompressor.setRemoveComments(rs.getBoolean("userdirective.compressHtml.removeComments", true));
- htmlCompressor.setRemoveMultiSpaces(rs.getBoolean("userdirective.compressHtml.removeMultiSpaces", true));
- htmlCompressor.setRemoveIntertagSpaces(rs.getBoolean("userdirective.compressHtml.removeIntertagSpaces", false));
- htmlCompressor.setRemoveQuotes(rs.getBoolean("userdirective.compressHtml.removeQuotes", false));
- htmlCompressor.setPreserveLineBreaks(rs.getBoolean("userdirective.compressHtml.preserveLineBreaks", false));
- htmlCompressor.setCompressJavaScript(compressJavaScript);
- htmlCompressor.setCompressCss(rs.getBoolean("userdirective.compressHtml.compressCss", false));
- htmlCompressor.setYuiJsNoMunge(rs.getBoolean("userdirective.compressHtml.yuiJsNoMunge", false));
- htmlCompressor.setYuiJsPreserveAllSemiColons(
- rs.getBoolean("userdirective.compressHtml.yuiJsPreserveAllSemiColons", false));
- htmlCompressor.setYuiJsLineBreak(rs.getInt("userdirective.compressHtml.yuiJsLineBreak", -1));
- htmlCompressor.setYuiCssLineBreak(rs.getInt("userdirective.compressHtml.yuiCssLineBreak", -1));
- htmlCompressor.setSimpleDoctype(rs.getBoolean("userdirective.compressHtml.simpleDoctype", false));
- htmlCompressor
- .setRemoveScriptAttributes(rs.getBoolean("userdirective.compressHtml.removeScriptAttributes", false));
- htmlCompressor
- .setRemoveStyleAttributes(rs.getBoolean("userdirective.compressHtml.removeStyleAttributes", false));
- htmlCompressor.setRemoveLinkAttributes(rs.getBoolean("userdirective.compressHtml.removeLinkAttributes", false));
- htmlCompressor.setRemoveFormAttributes(rs.getBoolean("userdirective.compressHtml.removeFormAttributes", false));
- htmlCompressor
- .setRemoveInputAttributes(rs.getBoolean("userdirective.compressHtml.removeInputAttributes", false));
- htmlCompressor
- .setSimpleBooleanAttributes(rs.getBoolean("userdirective.compressHtml.simpleBooleanAttributes", false));
- htmlCompressor.setRemoveJavaScriptProtocol(
- rs.getBoolean("userdirective.compressHtml.removeJavaScriptProtocol", false));
- htmlCompressor.setRemoveHttpProtocol(rs.getBoolean("userdirective.compressHtml.removeHttpProtocol", false));
- htmlCompressor.setRemoveHttpsProtocol(rs.getBoolean("userdirective.compressHtml.removeHttpsProtocol", false));
- if (compressJavaScript
- && rs.getString("userdirective.compressHtml.jsCompressor", HtmlCompressor.JS_COMPRESSOR_YUI)
- .equalsIgnoreCase(HtmlCompressor.JS_COMPRESSOR_CLOSURE)) {
- String closureOptLevel = rs.getString("userdirective.compressHtml.closureOptLevel",
- ClosureJavaScriptCompressor.COMPILATION_LEVEL_SIMPLE);
- ClosureJavaScriptCompressor closureCompressor = new ClosureJavaScriptCompressor();
- if (closureOptLevel.equalsIgnoreCase(ClosureJavaScriptCompressor.COMPILATION_LEVEL_ADVANCED)) {
- closureCompressor.setCompilationLevel(CompilationLevel.ADVANCED_OPTIMIZATIONS);
- } else if (closureOptLevel.equalsIgnoreCase(ClosureJavaScriptCompressor.COMPILATION_LEVEL_WHITESPACE)) {
- closureCompressor.setCompilationLevel(CompilationLevel.WHITESPACE_ONLY);
- } else {
- closureCompressor.setCompilationLevel(CompilationLevel.SIMPLE_OPTIMIZATIONS);
- }
- htmlCompressor.setJavaScriptCompressor(closureCompressor);
- }
- }
- @Override
- public boolean render(InternalContextAdapter context, Writer writer, Node node)
- throws IOException, MethodInvocationException {
- // render content
- StringWriter content = new StringWriter();
- node.jjtGetChild(0).render(context, content);
- // compress
- try {
- writer.write(htmlCompressor.compress(content.toString()));
- } catch (Exception e) {
- writer.write(content.toString());
- String msg = "Failed to compress content: " + content.toString();
- log.error(msg, e);
- throw new RuntimeException(msg, e);
- }
- return true;
- }
- }