/*
* 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.asual.lesscss.compiler;
import com.asual.lesscss.LessException;
import com.asual.lesscss.LessOptions;
import com.asual.lesscss.loader.ResourceLoader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.JavaScriptException;
import org.mozilla.javascript.NativeArray;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.UniqueTag;
import org.mozilla.javascript.tools.shell.Global;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class RhinoCompiler implements LessCompiler {
private final Log logger = LogFactory.getLog(getClass());
private final Scriptable scope;
private final Function compile;
public RhinoCompiler(LessOptions options, ResourceLoader loader, URL less, URL env, URL engine, URL cssmin, URL sourceMap) throws IOException {
Context cx = Context.enter();
logger.debug("Using implementation version: "
+ cx.getImplementationVersion());
cx.setOptimizationLevel(-1);
Global global = new Global();
global.init(cx);
scope = cx.initStandardObjects(global);
cx.evaluateReader(scope, new InputStreamReader(sourceMap
.openConnection().getInputStream()), sourceMap.getFile(), 1,
null);
cx.evaluateReader(scope, new InputStreamReader(env.openConnection()
.getInputStream()), env.getFile(), 1, null);
Scriptable lessEnv = (Scriptable) scope.get("lessenv", scope);
lessEnv.put("charset", lessEnv, options.getCharset());
lessEnv.put("css", lessEnv, options.isCss());
lessEnv.put("lineNumbers", lessEnv, options.getLineNumbers());
lessEnv.put("optimization", lessEnv, options.getOptimization());
lessEnv.put("sourceMap", lessEnv, options.isSourceMap());
lessEnv.put("sourceMapRootpath", lessEnv, options.getSourceMapRootpath());
lessEnv.put("sourceMapBasepath", lessEnv, options.getSourceMapBasepath());
lessEnv.put("sourceMapURL", lessEnv, options.getSourceMapUrl());
lessEnv.put("loader", lessEnv, Context.javaToJS(loader, scope));
if(options.getPaths() != null) {
NativeArray nativeArray = new NativeArray(options.getPaths());
lessEnv.put("paths", lessEnv, nativeArray);
}
cx.evaluateReader(scope, new InputStreamReader(less
.openConnection().getInputStream()), less.getFile(), 1,
null);
cx.evaluateReader(scope, new InputStreamReader(cssmin
.openConnection().getInputStream()), cssmin.getFile(), 1,
null);
cx.evaluateReader(scope, new InputStreamReader(engine
.openConnection().getInputStream()), engine.getFile(), 1,
null);
compile = (Function) scope.get("compile", scope);
Context.exit();
}
@Override
public String compile(String input, String location, boolean compress) throws LessException {
try {
return (String) Context.call(null, compile, scope, scope,
new Object[]{input, location, compress});
} catch (Exception e) {
throw new LessException(parseLessException(e));
}
}
private boolean hasProperty(Scriptable value, String name) {
Object property = ScriptableObject.getProperty(value, name);
return property != null && !property.equals(UniqueTag.NOT_FOUND);
}
private Exception parseLessException(Exception root) {
logger.debug("Parsing LESS Exception", root);
if (root instanceof JavaScriptException) {
Scriptable value = (Scriptable) ((JavaScriptException) root)
.getValue();
String type = ScriptableObject.getProperty(value, "type")
.toString() + " Error";
String message = ScriptableObject.getProperty(value, "message")
.toString();
String filename = "";
if (hasProperty(value, "filename")) {
filename = ScriptableObject.getProperty(value, "filename")
.toString();
}
int line = -1;
if (hasProperty(value, "line")) {
line = ((Double) ScriptableObject.getProperty(value, "line"))
.intValue();
}
int column = -1;
if (hasProperty(value, "column")) {
column = ((Double) ScriptableObject
.getProperty(value, "column")).intValue();
}
List<String> extractList = new ArrayList<String>();
if (hasProperty(value, "extract")) {
NativeArray extract = (NativeArray) ScriptableObject
.getProperty(value, "extract");
for (int i = 0; i < extract.getLength(); i++) {
if (extract.get(i, extract) instanceof String) {
extractList.add(((String) extract.get(i, extract))
.replace("\t", " "));
}
}
}
return new LessException(message, type, filename, line, column,
extractList);
}
return root;
}
}