Java tutorial
/* * JSweet transpiler - http://www.jsweet.org * Copyright (C) 2015 CINCHEO SAS <renaud.pawlak@cincheo.fr> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ package org.jsweet.transpiler.candy; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.Map; import java.util.function.Predicate; import java.util.jar.JarEntry; import java.util.jar.JarFile; import org.apache.commons.io.FileUtils; import org.apache.commons.io.FilenameUtils; import org.apache.commons.lang3.ArrayUtils; import org.apache.commons.lang3.StringUtils; import org.apache.log4j.Logger; import org.jsweet.JSweetConfig; import org.jsweet.transpiler.JSweetProblem; import org.jsweet.transpiler.TranspilationHandler; import com.google.gson.Gson; import com.google.gson.GsonBuilder; /** * The candy processor extracts and processes what is required from the candy * jars. It can include: * * <ul> * <li>embedded TypeScript definition files (*.d.ts)</li> * <li>embedded JavaScript</li> * </ul> * * @author Louis Grignon */ public class CandyProcessor { private static final Logger logger = Logger.getLogger(CandyProcessor.class); private final static Gson gson = new GsonBuilder().setPrettyPrinting().create(); private String classPath; /** * The name of the directory that will contain the candies. */ public static final String CANDIES_DIR_NAME = "candies"; /** * This directory will contain the sources. */ public static final String CANDIES_SOURCES_DIR_NAME = CANDIES_DIR_NAME + File.separator + "src"; /** * The name of the file that stores processed candies info. */ public static final String CANDIES_STORE_FILE_NAME = CANDIES_DIR_NAME + File.separator + CandyStore.class.getSimpleName() + ".json"; /** * The name of the directory that contains the TypeScript source files. */ public static final String CANDIES_TSDEFS_DIR_NAME = CANDIES_DIR_NAME + File.separator + JSweetConfig.TS_LIBS_DIR_NAME; /** * Default directory for extracted candies' javascript. */ private static final String CANDIES_DEFAULT_JS_DIR_NAME = CANDIES_DIR_NAME + File.separator + "js"; private File candiesSourceDir; private File candiesStoreFile; private File candiesTsdefsDir; private File candiesJavascriptOutDir; private File workingDir; /** * Create a candies processor. * * @param workingDir * the directory where the processor will save all cache and * temporary data for processing * @param classPath * the classpath where the processor will seek for JSweet candies * @param extractedCandiesJavascriptDir * see JSweetTranspiler.extractedCandyJavascriptDir */ public CandyProcessor(File workingDir, String classPath, File extractedCandiesJavascriptDir) { this.workingDir = workingDir; this.classPath = (classPath == null ? System.getProperty("java.class.path") : classPath); String[] cp = this.classPath.split(File.pathSeparator); int[] indices = new int[0]; for (int i = 0; i < cp.length; i++) { if (cp[i].replace('\\', '/').matches(".*org/jsweet/lib/.*-testbundle/.*/.*-testbundle-.*\\.jar")) { logger.warn("candies processor ignores classpath entry: " + cp[i]); indices = ArrayUtils.add(indices, i); } } cp = ArrayUtils.removeAll(cp, indices); this.classPath = StringUtils.join(cp, File.pathSeparator); logger.info("candies processor classpath: " + this.classPath); candiesSourceDir = new File(workingDir, CANDIES_SOURCES_DIR_NAME); candiesStoreFile = new File(workingDir, CANDIES_STORE_FILE_NAME); candiesTsdefsDir = new File(workingDir, CANDIES_TSDEFS_DIR_NAME); setCandiesJavascriptOutDir(extractedCandiesJavascriptDir); } private void setCandiesJavascriptOutDir(File extractedCandiesJavascriptDir) { this.candiesJavascriptOutDir = extractedCandiesJavascriptDir; if (this.candiesJavascriptOutDir == null) { logger.info("extracted candies directory is set to default"); this.candiesJavascriptOutDir = new File(workingDir, CANDIES_DEFAULT_JS_DIR_NAME); } logger.info("extracted candies directory: " + extractedCandiesJavascriptDir); this.candiesJavascriptOutDir.mkdirs(); } /** * Returns the directory that contains the orginal TypeScript source code of * the processed (merged) candies. */ public File getCandiesTsdefsDir() { return candiesTsdefsDir; } /** * Does the processing for the candies jars found in the classpath. */ public void processCandies(TranspilationHandler transpilationHandler) throws IOException { CandyStore candiesStore = getCandiesStore(); LinkedHashMap<File, CandyDescriptor> newCandiesDescriptors = getCandiesDescriptorsFromClassPath( transpilationHandler); CandyStore newStore = new CandyStore(new ArrayList<>(newCandiesDescriptors.values())); if (newStore.equals(candiesStore)) { logger.info("candies are up to date"); return; } this.candiesStore = newStore; logger.info("candies changed, processing candies: " + this.candiesStore); try { extractCandies(newCandiesDescriptors); writeCandiesStore(); } catch (Throwable t) { logger.error("cannot generate candies bundle", t); // exit with fatal if no jar ? } } /** * Returns true if the candy store contains the J4TS candy. */ public boolean isUsingJavaRuntime() { if (candiesStore == null) { return false; } else { for (CandyDescriptor c : candiesStore.getCandies()) { if (c.name != null && c.name.equals("j4ts")) { logger.info("found j4ts Java runtime in classpath"); return true; } } return false; } } private LinkedHashMap<File, CandyDescriptor> getCandiesDescriptorsFromClassPath( TranspilationHandler transpilationHandler) throws IOException { LinkedHashMap<File, CandyDescriptor> jarFilesCollector = new LinkedHashMap<>(); for (String classPathEntry : classPath.split("[" + System.getProperty("path.separator") + "]")) { if (classPathEntry.endsWith(".jar")) { File jarFile = new File(classPathEntry); try (JarFile jarFileHandle = new JarFile(jarFile)) { JarEntry candySpecificEntry = jarFileHandle .getJarEntry("META-INF/maven/" + JSweetConfig.MAVEN_CANDIES_GROUP); JarEntry candySpecificEntry2 = jarFileHandle.getJarEntry("META-INF/candy-metadata.json"); boolean isCandy = candySpecificEntry != null || candySpecificEntry2 != null; if (isCandy) { CandyDescriptor descriptor = CandyDescriptor.fromCandyJar(jarFileHandle, candiesJavascriptOutDir.getAbsolutePath()); checkCandyVersion(descriptor, transpilationHandler); jarFilesCollector.put(jarFile, descriptor); } } } } logger.info(jarFilesCollector.keySet().size() + " candies found in classpath"); return jarFilesCollector; } private void checkCandyVersion(CandyDescriptor candy, TranspilationHandler transpilationHandler) { String actualTranspilerVersion = JSweetConfig.getVersionNumber().split("-")[0]; String candyTranspilerVersion = candy.transpilerVersion == null ? null : candy.transpilerVersion.split("-")[0]; if (candyTranspilerVersion == null || !candyTranspilerVersion.equals(actualTranspilerVersion)) { transpilationHandler.report(JSweetProblem.CANDY_VERSION_DISCREPANCY, null, JSweetProblem.CANDY_VERSION_DISCREPANCY.getMessage(candy.name, candy.version, actualTranspilerVersion, candyTranspilerVersion)); } } private void extractCandies(Map<File, CandyDescriptor> candies) throws IOException { File extractedSourcesDir = candiesSourceDir; File extractedTsDefsDir = candiesTsdefsDir; FileUtils.deleteQuietly(extractedSourcesDir); FileUtils.deleteQuietly(extractedTsDefsDir); extractedSourcesDir.mkdirs(); extractedTsDefsDir.mkdirs(); for (Map.Entry<File, CandyDescriptor> candy : candies.entrySet()) { CandyDescriptor candyDescriptor = candy.getValue(); File jarFile = candy.getKey(); String candyName = candyDescriptor.name; boolean isCore = "jsweet-core".equals(candyName); try (JarFile jarFileHandle = new JarFile(jarFile)) { String candyJarName = FilenameUtils.getBaseName(jarFile.getName()); File candyExtractedSourcesDir = new File(extractedSourcesDir, candyJarName); File candyExtractedJsDir = new File(candiesJavascriptOutDir, candyJarName); extractCandy( // candyDescriptor, // jarFileHandle, // candyExtractedSourcesDir, // extractedTsDefsDir, // candyExtractedJsDir, // isCore ? tsDefName -> false : null); } } } private void extractCandy( // CandyDescriptor descriptor, // JarFile jarFile, // File javaOutputDirectory, // File tsDefOutputDirectory, // File jsOutputDirectory, // Predicate<String> isTsDefToBeExtracted) { logger.info("extract candy: " + jarFile.getName() + " javaOutputDirectory=" + javaOutputDirectory + " tsDefOutputDirectory=" + tsDefOutputDirectory + " jsOutputDir=" + jsOutputDirectory); jarFile.stream().filter(entry -> entry.getName().endsWith(".d.ts") && (entry.getName().startsWith("src/") || entry.getName().startsWith("META-INF/resources/"))) // .forEach(entry -> { File out; if (entry.getName().endsWith(".java")) { // RP: this looks like dead code... out = new File(javaOutputDirectory + "/" + entry.getName().substring(4)); } else if (entry.getName().endsWith(".d.ts")) { if (isTsDefToBeExtracted != null && !isTsDefToBeExtracted.test(entry.getName())) { return; } out = new File(tsDefOutputDirectory + "/" + entry.getName()); } else { out = null; } extractEntry(jarFile, entry, out); }); for (String jsFilePath : descriptor.jsFilesPaths) { JarEntry entry = jarFile.getJarEntry(jsFilePath); String relativeJsPath = jsFilePath.substring(descriptor.jsDirPath.length()); File out = new File(jsOutputDirectory, relativeJsPath); extractEntry(jarFile, entry, out); } } private void extractEntry(JarFile jarFile, JarEntry entry, File out) { if (out == null) { return; } out.getParentFile().mkdirs(); try { FileUtils.copyInputStreamToFile(jarFile.getInputStream(entry), out); } catch (Exception e) { throw new RuntimeException(e); } } private CandyStore candiesStore; /** * Cleans the candies store so that it will be read from file next time. */ public void touch() { candiesStore = null; } private CandyStore getCandiesStore() { if (candiesStore == null) { if (candiesStoreFile.exists()) { try { candiesStore = gson.fromJson(FileUtils.readFileToString(candiesStoreFile), CandyStore.class); } catch (Exception e) { logger.error("cannot read candies index", e); } } if (candiesStore == null) { candiesStore = new CandyStore(); } } return candiesStore; } private void writeCandiesStore() { if (candiesStore != null) { try { FileUtils.write(candiesStoreFile, gson.toJson(candiesStore)); } catch (Exception e) { logger.error("cannot read candies index", e); } } } }