/* Copyright 2013 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 cn.dreampie.common.plugin.lesscss.compiler;
import org.lesscss.LessException;
import org.lesscss.LessSource;
import org.lesscss.deps.org.apache.commons.io.FileUtils;
import org.lesscss.deps.org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.util.Arrays;
import java.util.List;
public class NodeJsLessCssCompiler {
private static final List<String> resources = Arrays.asList(
"lessc.js",
"less/visitor.js",
"less/tree.js",
"less/to-css-visitor.js",
"less/source-map-output.js",
"less/rhino.js",
"less/parser.js",
"less/lessc_helper.js",
"less/join-selector-visitor.js",
"less/index.js",
"less/import-visitor.js",
"less/functions.js",
"less/extend-visitor.js",
"less/env.js",
"less/colors.js",
"less/browser.js",
"less/tree/variable.js",
"less/tree/value.js",
"less/tree/url.js",
"less/tree/unicode-descriptor.js",
"less/tree/selector.js",
"less/tree/ruleset.js",
"less/tree/rule.js",
"less/tree/ratio.js",
"less/tree/quoted.js",
"less/tree/paren.js",
"less/tree/operation.js",
"less/tree/negative.js",
"less/tree/mixin.js",
"less/tree/media.js",
"less/tree/keyword.js",
"less/tree/javascript.js",
"less/tree/import.js",
"less/tree/extend.js",
"less/tree/expression.js",
"less/tree/element.js",
"less/tree/directive.js",
"less/tree/dimension.js",
"less/tree/condition.js",
"less/tree/comment.js",
"less/tree/color.js",
"less/tree/call.js",
"less/tree/assignment.js",
"less/tree/anonymous.js",
"less/tree/alpha.js");
private Logger logger = LoggerFactory.getLogger(getClass());
private final boolean compress;
private final String encoding;
private final File tempDir;
private final String nodeExecutablePath;
public NodeJsLessCssCompiler(boolean compress, String encoding, Logger logger) throws IOException {
this("node", compress, encoding, logger);
}
public NodeJsLessCssCompiler(String nodeExecutablePath, boolean compress,
String encoding, Logger logger) throws IOException {
this.compress = compress;
this.encoding = encoding;
this.logger = logger;
this.nodeExecutablePath = nodeExecutablePath;
tempDir = createTempDir("lessc");
new File(tempDir, "less/tree").mkdirs();
for (String resource : resources) {
InputStream in = NodeJsLessCssCompiler.class.getClassLoader()
.getResourceAsStream("org/lesscss/mojo/js/" + resource);
FileOutputStream out = new FileOutputStream(new File(tempDir, resource));
IOUtils.copy(in, out);
in.close();
out.close();
}
}
public void close() {
for (String resource : resources) {
File tempFile = new File(tempDir, resource);
if (!tempFile.delete()) {
logger.warn("Could not delete temp file: " + tempFile.getAbsolutePath());
}
}
File lessSubdir = new File(tempDir, "less");
File treeSubdir = new File(lessSubdir, "tree");
if (!treeSubdir.delete()) {
logger.warn("Could not delete temp dir: " + treeSubdir.getAbsolutePath());
}
if (!lessSubdir.delete()) {
logger.warn("Could not delete temp dir: " + lessSubdir.getAbsolutePath());
}
if (!tempDir.delete()) {
logger.warn("Could not delete temp dir: " + tempDir.getAbsolutePath());
}
}
public void compile(LessSource input, File output, boolean force)
throws IOException, LessException, InterruptedException {
if (force || !output.exists() || output.lastModified() < input.getLastModifiedIncludingImports()) {
String data = compile(input.getNormalizedContent());
FileUtils.writeStringToFile(output, data, encoding);
}
}
private String compile(String input) throws LessException, IOException, InterruptedException {
long start = System.currentTimeMillis();
File inputFile = File.createTempFile("lessc-input-", ".less");
FileOutputStream out = new FileOutputStream(inputFile);
IOUtils.write(input, out);
out.close();
File outputFile = File.createTempFile("lessc-output-", ".css");
File lesscJsFile = new File(tempDir, "lessc.js");
ProcessBuilder pb = new ProcessBuilder(nodeExecutablePath, lesscJsFile.getAbsolutePath(),
inputFile.getAbsolutePath(), outputFile.getAbsolutePath(), String.valueOf(compress));
pb.redirectErrorStream(true);
Process process = pb.start();
IOUtils.copy(process.getInputStream(), System.out);
int exitStatus = process.waitFor();
FileInputStream in = new FileInputStream(outputFile);
String result = IOUtils.toString(in);
in.close();
if (!inputFile.delete()) {
logger.warn("Could not delete temp file: " + inputFile.getAbsolutePath());
}
if (!outputFile.delete()) {
logger.warn("Could not delete temp file: " + outputFile.getAbsolutePath());
}
if (exitStatus != 0) {
throw new LessException(result, null);
}
logger.debug("Finished compilation of LESS source in " + (System.currentTimeMillis() - start) + " ms.");
return result;
}
// copied from guava's Files.createTempDir, with added prefix
private static File createTempDir(String prefix) {
final int tempDirAttempts = 10000;
File baseDir = new File(System.getProperty("java.io.tmpdir"));
String baseName = prefix + "-" + System.currentTimeMillis() + "-";
for (int counter = 0; counter < tempDirAttempts; counter++) {
File tempDir = new File(baseDir, baseName + counter);
if (tempDir.mkdir()) {
return tempDir;
}
}
throw new IllegalStateException("Failed to create directory within " + tempDirAttempts
+ " attempts (tried " + baseName + "0 to " + baseName + (tempDirAttempts - 1) + ')');
}
}