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Adds Nashorn support. Fixes #55 
1 parent b2f9de9 commit 6b57d7d

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4 files changed

+146
-2
lines changed

4 files changed

+146
-2
lines changed

‎src/main/java/com/asual/lesscss/LessEngine.java

+8-1
Original file line numberDiff line numberDiff line change
@@ -25,6 +25,7 @@
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import org.apache.commons.logging.LogFactory;
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import com.asual.lesscss.compiler.LessCompiler;
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import com.asual.lesscss.compiler.NashornCompiler;
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import com.asual.lesscss.compiler.RhinoCompiler;
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import com.asual.lesscss.loader.ChainedResourceLoader;
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import com.asual.lesscss.loader.ClasspathResourceLoader;
@@ -80,7 +81,13 @@ public LessEngine(LessOptions options, ResourceLoader loader) {
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URL engine = classLoader.getResource("META-INF/engine.js");
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URL cssmin = classLoader.getResource("META-INF/cssmin.js");
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URL sourceMap = classLoader.getResource("META-INF/source-map.js");
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compiler = new RhinoCompiler(options, loader, less, env, engine, cssmin, sourceMap);
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double version = Double.parseDouble(Runtime.class.getPackage()
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.getImplementationVersion().replaceFirst("^(\\d\\.\\d).*", "$1"));
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if (version < 1.8) {
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compiler = new RhinoCompiler(options, loader, less, env, engine, cssmin, sourceMap);
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} else {
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compiler = new NashornCompiler(options, loader, less, env, engine, cssmin, sourceMap);
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}
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} catch (Exception e) {
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logger.error("LESS Engine intialization failed.", e);
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}

‎src/main/java/com/asual/lesscss/compiler/NashornCompiler.java

+127
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@@ -0,0 +1,127 @@
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 com.asual.lesscss.compiler;
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import com.asual.lesscss.LessException;
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import com.asual.lesscss.LessOptions;
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import com.asual.lesscss.loader.ResourceLoader;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.List;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import jdk.nashorn.api.scripting.ScriptObjectMirror;
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import jdk.nashorn.internal.objects.NativeArray;
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import jdk.nashorn.internal.runtime.ScriptObject;
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import jdk.nashorn.internal.runtime.ECMAException;
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@SuppressWarnings("restriction")
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public class NashornCompiler implements LessCompiler {
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private final Log logger = LogFactory.getLog(getClass());
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private ScriptObjectMirror compile;
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public NashornCompiler(LessOptions options, ResourceLoader loader, URL less, URL env, URL engine, URL cssmin, URL sourceMap) throws IOException {
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ScriptEngineManager factory = new ScriptEngineManager();
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ScriptEngine scriptEngine = factory.getEngineByName("nashorn");
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try {
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scriptEngine.eval(new InputStreamReader(sourceMap
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.openConnection().getInputStream()));
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scriptEngine.eval(new InputStreamReader(env.openConnection()
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.getInputStream()));
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ScriptObjectMirror lessenv = (ScriptObjectMirror) scriptEngine.get("lessenv");
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lessenv.put("charset", options.getCharset());
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lessenv.put("css", options.isCss());
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lessenv.put("lineNumbers", options.getLineNumbers());
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lessenv.put("optimization", options.getOptimization());
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lessenv.put("sourceMap", options.isSourceMap());
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lessenv.put("sourceMapRootpath", options.getSourceMapRootpath());
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lessenv.put("sourceMapBasepath", options.getSourceMapBasepath());
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lessenv.put("sourceMapURL", options.getSourceMapUrl());
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lessenv.put("loader", loader);
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lessenv.put("paths", options.getPaths());
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scriptEngine.eval(new InputStreamReader(less
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.openConnection().getInputStream()));
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scriptEngine.eval(new InputStreamReader(cssmin.openConnection()
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.getInputStream()));
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scriptEngine.eval(new InputStreamReader(engine.openConnection()
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.getInputStream()));
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compile = (ScriptObjectMirror) scriptEngine.get("compile");
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} catch (ScriptException e) {
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logger.error(e.getMessage(), e);
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}
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}
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@Override
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public String compile(String input, String location, boolean compress) throws LessException {
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try {
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return (String) compile.call(null, input, location, compress);
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} catch (Exception e) {
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throw new LessException(parseLessException(e));
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}
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}
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private Exception parseLessException(Exception root) {
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logger.debug("Parsing LESS Exception", root);
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if (root instanceof ECMAException) {
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ECMAException e = (ECMAException) root;
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Object thrown = e.getThrown();
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String type = null;
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String message = null;
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String filename = null;
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int line = -1;
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int column = -1;
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List<String> extractList = new ArrayList<String>();
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if (thrown instanceof ScriptObject) {
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ScriptObject so = (ScriptObject) e.getThrown();
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type = so.get("type").toString() + " Error";
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message = so.get("message").toString();
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filename = "";
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if (so.has("filename")) {
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filename = so.get("filename").toString();
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}
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if (so.has("line")) {
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line = ((Long) so.get("line")).intValue();
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}
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if (so.has("column")) {
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column = ((Double) so.get("column")).intValue();
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}
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if (so.has("extract")) {
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NativeArray extract = (NativeArray) so.get("extract");
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for (int i = 0; i < extract.size(); i++) {
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if (extract.get(i) instanceof String) {
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extractList.add(((String) extract.get(i))
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.replace("\t", " "));
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}
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}
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}
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} else {
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type = thrown.getClass().getSimpleName() + " Error";
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message = e.getMessage().replaceFirst("[^:]+: ", "");
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}
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return new LessException(message, type, filename, line, column,
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extractList);
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}
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return root;
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}
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}

‎src/main/resources/META-INF/engine.js

+1
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
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print = lessenv.print;
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quit = lessenv.quit;
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readFile = lessenv.readFile;
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readUrl = lessenv.readUrl;
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delete arguments;
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var basePath = function(path) {

‎src/main/resources/META-INF/env.js

+10-1
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,12 @@
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if (typeof readFile === "undefined") {
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var readFile = function(path) {
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return new String(java.nio.file.Files.readAllBytes(java.nio.file.Paths.get(path)));
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};
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var readUrl = function(url) {
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return new String(java.nio.file.Files.readAllBytes(java.nio.file.Paths.get(new java.net.URL(url).getAbsoluteFile())));
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};
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}
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var lessenv = {
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print : print,
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quit : quit,
@@ -20,7 +29,7 @@ var lessenv = {
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return javax.xml.bind.DatatypeConverter.printBase64Binary(
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new java.lang.String(str).getBytes());
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}
23-
},location = {
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}, location = {
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port : 0
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}, document = {
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getElementsByTagName : function(name) {

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