groovy/groovy-core/src/main/org/codehaus/groovy/ant/Groovyc.java

/*
 $Id$

 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.

 Redistribution and use of this software and associated documentation
 ("Software"), with or without modification, are permitted provided
 that the following conditions are met:

 1. Redistributions of source code must retain copyright
    statements and notices.  Redistributions must also contain a
    copy of this document.

 2. Redistributions in binary form must reproduce the
    above copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.

 3. The name "groovy" must not be used to endorse or promote
    products derived from this Software without prior written
    permission of The Codehaus.  For written permission,
    please contact info@codehaus.org.

 4. Products derived from this Software may not be called "groovy"
    nor may "groovy" appear in their names without prior written
    permission of The Codehaus. "groovy" is a registered
    trademark of The Codehaus.

 5. Due credit should be given to The Codehaus -
    http://groovy.codehaus.org/

 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 OF THE POSSIBILITY OF SUCH DAMAGE.

 */
package org.codehaus.groovy.ant;

import groovy.lang.GroovyClassLoader;

import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.List;

import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.listener.AnsiColorLogger;
import org.apache.tools.ant.taskdefs.MatchingTask;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.util.GlobPatternMapper;
import org.apache.tools.ant.util.SourceFileScanner;
import org.codehaus.groovy.control.CompilationUnit;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.tools.ErrorReporter;


/**
 * Compiles Groovy source files. This task can take the following
 * arguments:
 * <ul>
 * <li>sourcedir
 * <li>destdir
 * <li>classpath
 * <li>stacktrace
 * </ul>
 * Of these arguments, the <b>sourcedir</b> and <b>destdir</b> are required.
 * <p>
 * When this task executes, it will recursively scan the sourcedir and
 * destdir looking for Groovy source files to compile. This task makes its
 * compile decision based on timestamp.
 * 
 * Based heavily on the Javac implementation in Ant
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
 * @author Hein Meling
 * @version $Revision$ 
 */
public class Groovyc extends MatchingTask {

    private CompilerConfiguration configuration = new CompilerConfiguration();
    private Path src;
    private File destDir;
    private Path compileClasspath;
    private Path compileSourcepath;
    private String encoding;

    protected boolean failOnError = true;
    protected boolean listFiles = false;
    protected File[] compileList = new File[0];

    public static void main(String[] args) {
        String dest = ".";
        String src = ".";
        boolean listFiles = false;
        if (args.length > 0) {
            dest = args[0];
        }
        if (args.length > 1) {
            src = args[1];
        }
        if (args.length > 2) {
            String flag = args[2];
            if (flag.equalsIgnoreCase("true")) {
                listFiles = true;
            }
        }

        Project project = new Project();
        project.addBuildListener(new AnsiColorLogger());

        Groovyc compiler = new Groovyc();
        compiler.setProject(project);
        compiler.setSrcdir(new Path(project, src));
        compiler.setDestdir(project.resolveFile(dest));
        compiler.setListfiles(listFiles);
        compiler.execute();
    }

    public Groovyc() {
    }

    /**
     * Adds a path for source compilation.
     *
     * @return a nested src element.
     */
    public Path createSrc() {
        if (src == null) {
            src = new Path(getProject());
        }
        return src.createPath();
    }

    /**
     * Recreate src.
     *
     * @return a nested src element.
     */
    protected Path recreateSrc() {
        src = null;
        return createSrc();
    }

    /**
     * Set the source directories to find the source Java files.
     * @param srcDir the source directories as a path
     */
    public void setSrcdir(Path srcDir) {
        if (src == null) {
            src = srcDir;
        }
        else {
            src.append(srcDir);
        }
    }

    /**
     * Gets the source dirs to find the source java files.
     * @return the source directorys as a path
     */
    public Path getSrcdir() {
        return src;
    }

    /**
     * Set the destination directory into which the Java source
     * files should be compiled.
     * @param destDir the destination director
     */
    public void setDestdir(File destDir) {
        this.destDir = destDir;
    }

    /**
     * Enable verbose compiling which will display which files
     * are being compiled
     * @param verbose
     */
    public void setVerbose(boolean verbose) {
        configuration.setVerbose( verbose );
    }

    /**
     * Enable compiler to report stack trace information if a problem occurs
     * during compilation.
     * @param stacktrace
     */
    public void setStacktrace(boolean stacktrace) {
        configuration.setDebug(stacktrace);
    }

    /**
     * Gets the destination directory into which the java source files
     * should be compiled.
     * @return the destination directory
     */
    public File getDestdir() {
        return destDir;
    }

    /**
     * Set the sourcepath to be used for this compilation.
     * @param sourcepath the source path
     */
    public void setSourcepath(Path sourcepath) {
        if (compileSourcepath == null) {
            compileSourcepath = sourcepath;
        }
        else {
            compileSourcepath.append(sourcepath);
        }
    }

    /**
     * Gets the sourcepath to be used for this compilation.
     * @return the source path
     */
    public Path getSourcepath() {
        return compileSourcepath;
    }

    /**
     * Adds a path to sourcepath.
     * @return a sourcepath to be configured
     */
    public Path createSourcepath() {
        if (compileSourcepath == null) {
            compileSourcepath = new Path(getProject());
        }
        return compileSourcepath.createPath();
    }

    /**
     * Adds a reference to a source path defined elsewhere.
     * @param r a reference to a source path
     */
    public void setSourcepathRef(Reference r) {
        createSourcepath().setRefid(r);
    }

    /**
     * Set the classpath to be used for this compilation.
     *
     * @param classpath an Ant Path object containing the compilation classpath.
     */
    public void setClasspath(Path classpath) {
        if (compileClasspath == null) {
            compileClasspath = classpath;
        }
        else {
            compileClasspath.append(classpath);
        }
    }

    /**
     * Gets the classpath to be used for this compilation.
     * @return the class path
     */
    public Path getClasspath() {
        return compileClasspath;
    }

    /**
     * Adds a path to the classpath.
     * @return a class path to be configured
     */
    public Path createClasspath() {
        if (compileClasspath == null) {
            compileClasspath = new Path(getProject());
        }
        return compileClasspath.createPath();
    }

    /**
     * Adds a reference to a classpath defined elsewhere.
     * @param r a reference to a classpath
     */
    public void setClasspathRef(Reference r) {
        createClasspath().setRefid(r);
    }

    public String createEncoding() {
        if (encoding == null) {
            encoding = System.getProperty("file.encoding");
        }
        return encoding;
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    public String getEncoding() {
        return encoding;
    }

    /**
     * If true, list the source files being handed off to the compiler.
     * @param list if true list the source files
     */
    public void setListfiles(boolean list) {
        listFiles = list;
    }

    /**
     * Get the listfiles flag.
     * @return the listfiles flag
     */
    public boolean getListfiles() {
        return listFiles;
    }

    /**
     * Indicates whether the build will continue
     * even if there are compilation errors; defaults to true.
     * @param fail if true halt the build on failure
     */
    public void setFailonerror(boolean fail) {
        failOnError = fail;
    }

    /**
     * @ant.attribute ignore="true"
     * @param proceed inverse of failoferror
     */
    public void setProceed(boolean proceed) {
        failOnError = !proceed;
    }

    /**
     * Gets the failonerror flag.
     * @return the failonerror flag
     */
    public boolean getFailonerror() {
        return failOnError;
    }

    /**
     * Executes the task.
     * @exception BuildException if an error occurs
     */
    public void execute() throws BuildException {
        checkParameters();
        resetFileLists();

        // scan source directories and dest directory to build up
        // compile lists
        String[] list = src.list();
        for (int i = 0; i < list.length; i++) {
            File srcDir = getProject().resolveFile(list[i]);
            if (!srcDir.exists()) {
                throw new BuildException("srcdir \"" + srcDir.getPath() + "\" does not exist!", getLocation());
            }

            DirectoryScanner ds = this.getDirectoryScanner(srcDir);
            String[] files = ds.getIncludedFiles();

            scanDir(srcDir, destDir != null ? destDir : srcDir, files);
        }

        compile();
    }

    /**
     * Clear the list of files to be compiled and copied..
     */
    protected void resetFileLists() {
        compileList = new File[0];
    }

    /**
     * Scans the directory looking for source files to be compiled.
     * The results are returned in the class variable compileList
     *
     * @param srcDir   The source directory
     * @param destDir  The destination directory
     * @param files    An array of filenames
     */
    protected void scanDir(File srcDir, File destDir, String[] files) {
        GlobPatternMapper m = new GlobPatternMapper();
        m.setFrom("*.groovy");
        m.setTo("*.class");
        SourceFileScanner sfs = new SourceFileScanner(this);
        File[] newFiles = sfs.restrictAsFiles(files, srcDir, destDir, m);

        if (newFiles.length > 0) {
            File[] newCompileList = new File[compileList.length + newFiles.length];
            System.arraycopy(compileList, 0, newCompileList, 0, compileList.length);
            System.arraycopy(newFiles, 0, newCompileList, compileList.length, newFiles.length);
            compileList = newCompileList;
        }
    }

    /**
     * Gets the list of files to be compiled.
     * @return the list of files as an array
     */
    public File[] getFileList() {
        return compileList;
    }

    protected void checkParameters() throws BuildException {
        if (src == null) {
            throw new BuildException("srcdir attribute must be set!", getLocation());
        }
        if (src.size() == 0) {
            throw new BuildException("srcdir attribute must be set!", getLocation());
        }

        if (destDir != null && !destDir.isDirectory()) {
            throw new BuildException(
                "destination directory \"" + destDir + "\" does not exist " + "or is not a directory",
                getLocation());
        }

        if (encoding != null && !Charset.isSupported(encoding)) {
            throw new BuildException("encoding \"\" not supported");
        }
    }

    protected void compile() {

        if (compileList.length > 0) {
            log(
                "Compiling "
                    + compileList.length
                    + " source file"
                    + (compileList.length == 1 ? "" : "s")
                    + (destDir != null ? " to " + destDir : ""));

            if (listFiles) {
                for (int i = 0; i < compileList.length; i++) {
                    String filename = compileList[i].getAbsolutePath();

                    // TODO this logging does not seem to appear in the maven build??
                    // COMMENT Hein: This is not ant's problem;
                    // fix it in maven instead if you really need this from maven!
                    log(filename);
//                    System.out.println("compiling: " + filename);
                }
            }

            try {
                Path classpath = getClasspath();
                if (classpath != null) {
                    configuration.setClasspath(classpath.toString());
                }
                configuration.setTargetDirectory(destDir);

                if (encoding != null) {
                    configuration.setSourceEncoding(encoding);
                }

                CompilationUnit unit = new CompilationUnit(configuration, null, buildClassLoaderFor());
                unit.addSources(compileList);
                unit.compile();
            }
            catch (Exception e) {

                StringWriter writer = new StringWriter();
                new ErrorReporter( e, false ).write( new PrintWriter(writer) );
                String message = writer.toString();

                if (failOnError) {
                    throw new BuildException(message, e, getLocation());
                }
                else {
                    log(message, Project.MSG_ERR);
                }

            }
        }
    }

    private GroovyClassLoader buildClassLoaderFor() {
        ClassLoader parent = this.getClass().getClassLoader();
        if (parent instanceof AntClassLoader) {
            AntClassLoader antLoader = (AntClassLoader) parent;
            String[] pathElm = antLoader.getClasspath().split(File.pathSeparator);
            List classpath = configuration.getClasspath();
            /*
             * Iterate over the classpath provided to groovyc, and add any missing path
             * entries to the AntClassLoader.  This is a workaround, since for some reason
             * 'directory' classpath entries were not added to the AntClassLoader' classpath. 
             */
            for (Iterator iter = classpath.iterator(); iter.hasNext();) {
                String cpEntry = (String) iter.next();
                boolean found = false;
                for (int i = 0; i < pathElm.length; i++) {
                    if (cpEntry.equals(pathElm[i])) {
                        found = true;
                        break;
                    }
                }
                if (!found)
                    antLoader.addPathElement(cpEntry);
            }
        }
        return new GroovyClassLoader(parent, configuration);
    }

}