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package org.javacc.mojo;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.cli.StreamConsumer;
/**
* Provides a facade for the mojos to invoke JTB.
*
* @author Benjamin Bentmann
* @version $Id$
* @see Java Tree Builder
*/
class JTB
extends ToolFacade
{
/**
* The default package name for syntax tree files.
*/
private static final String SYNTAX_TREE = "syntaxtree";
/**
* The default package name for visitor files.
*/
private static final String VISITOR = "visitor";
/**
* The input grammar.
*/
private File inputFile;
/**
* The base directory for the option "-o".
*/
private File outputDirectory;
/**
* The output directory for the syntax tree files.
*/
private File nodeDirectory;
/**
* The output directory for the visitor files.
*/
private File visitorDirectory;
/**
* The option "-p".
*/
private String packageName;
/**
* The option "-np".
*/
private String nodePackageName;
/**
* The option "-vp".
*/
private String visitorPackageName;
/**
* The option "-e".
*/
private Boolean supressErrorChecking;
/**
* The option "-jd".
*/
private Boolean javadocFriendlyComments;
/**
* The option "-f".
*/
private Boolean descriptiveFieldNames;
/**
* The option "-ns".
*/
private String nodeParentClass;
/**
* The option "-pp".
*/
private Boolean parentPointers;
/**
* The option "-tk".
*/
private Boolean specialTokens;
/**
* The toolkit option "-scheme".
*/
private Boolean scheme;
/**
* The toolkit option "-printer".
*/
private Boolean printer;
/**
* Sets the absolute path to the grammar file to pass into JTB for preprocessing.
*
* @param value The absolute path to the grammar file to pass into JTB for preprocessing.
*/
public void setInputFile( File value )
{
if ( value != null && !value.isAbsolute() )
{
throw new IllegalArgumentException( "path is not absolute: " + value );
}
this.inputFile = value;
}
/**
* Sets the absolute path to the output directory for the generated grammar file.
*
* @param value The absolute path to the output directory for the generated grammar file. If this directory does not
* exist yet, it is created. Note that this path should already include the desired package hierarchy
* because JTB will not append the required sub directories automatically.
*/
public void setOutputDirectory( File value )
{
if ( value != null && !value.isAbsolute() )
{
throw new IllegalArgumentException( "path is not absolute: " + value );
}
this.outputDirectory = value;
}
/**
* Gets the absolute path to the enhanced grammar file generated by JTB.
*
* @return The absolute path to the enhanced grammar file generated by JTB or null if either the
* input file or the output directory have not been set.
*/
public File getOutputFile()
{
File outputFile = null;
if ( this.outputDirectory != null && this.inputFile != null )
{
String fileName = FileUtils.removeExtension( this.inputFile.getName() ) + ".jj";
outputFile = new File( this.outputDirectory, fileName );
}
return outputFile;
}
/**
* Sets the absolute path to the output directory for the syntax tree files.
*
* @param value The absolute path to the output directory for the generated syntax tree files, may be
* null to use a sub directory in the output directory of the grammar file. If this
* directory does not exist yet, it is created. Note that this path should already include the desired
* package hierarchy because JTB will not append the required sub directories automatically.
*/
public void setNodeDirectory( File value )
{
if ( value != null && !value.isAbsolute() )
{
throw new IllegalArgumentException( "path is not absolute: " + value );
}
this.nodeDirectory = value;
}
/**
* Gets the absolute path to the output directory for the syntax tree files.
*
* @return The absolute path to the output directory for the syntax tree files, only null if neither
* {@link #outputDirectory} nor {@link #nodeDirectory} have been set.
*/
private File getEffectiveNodeDirectory()
{
if ( this.nodeDirectory != null )
{
return this.nodeDirectory;
}
else if ( this.outputDirectory != null )
{
return new File( this.outputDirectory, getLastPackageName( getEffectiveNodePackageName() ) );
}
return null;
}
/**
* Sets the absolute path to the output directory for the visitor files.
*
* @param value The absolute path to the output directory for the generated visitor files, may be null
* to use a sub directory in the output directory of the grammar file. If this directory does not exist
* yet, it is created. Note that this path should already include the desired package hierarchy because
* JTB will not append the required sub directories automatically.
*/
public void setVisitorDirectory( File value )
{
if ( value != null && !value.isAbsolute() )
{
throw new IllegalArgumentException( "path is not absolute: " + value );
}
this.visitorDirectory = value;
}
/**
* Gets the absolute path to the output directory for the visitor files.
*
* @return The absolute path to the output directory for the visitor, only null if neither
* {@link #outputDirectory} nor {@link #visitorDirectory} have been set.
*/
private File getEffectiveVisitorDirectory()
{
if ( this.visitorDirectory != null )
{
return this.visitorDirectory;
}
else if ( this.outputDirectory != null )
{
return new File( this.outputDirectory, getLastPackageName( getEffectiveVisitorPackageName() ) );
}
return null;
}
/**
* Sets the option "-p". Will overwrite the options "-np" and "-vp" if specified.
*
* @param value The option value, may be null.
*/
public void setPackageName( String value )
{
this.packageName = value;
}
/**
* Sets the option "-np".
*
* @param value The option value, may be null.
*/
public void setNodePackageName( String value )
{
this.nodePackageName = value;
}
/**
* Gets the effective package name for the syntax tree files.
*
* @return The effective package name for the syntax tree files, never null.
*/
private String getEffectiveNodePackageName()
{
if ( this.packageName != null )
{
return ( this.packageName.length() <= 0 ) ? SYNTAX_TREE : this.packageName + '.' + SYNTAX_TREE;
}
else if ( this.nodePackageName != null )
{
return this.nodePackageName;
}
else
{
return SYNTAX_TREE;
}
}
/**
* Sets the option "-vp".
*
* @param value The option value, may be null.
*/
public void setVisitorPackageName( String value )
{
this.visitorPackageName = value;
}
/**
* Gets the effective package name for the visitor files.
*
* @return The effective package name for the visitor files, never null.
*/
private String getEffectiveVisitorPackageName()
{
if ( this.packageName != null )
{
return ( this.packageName.length() <= 0 ) ? VISITOR : this.packageName + '.' + VISITOR;
}
else if ( this.visitorPackageName != null )
{
return this.visitorPackageName;
}
else
{
return VISITOR;
}
}
/**
* Sets the option "-e".
*
* @param value The option value, may be null.
*/
public void setSupressErrorChecking( Boolean value )
{
this.supressErrorChecking = value;
}
/**
* Sets the option "-jd".
*
* @param value The option value, may be null.
*/
public void setJavadocFriendlyComments( Boolean value )
{
this.javadocFriendlyComments = value;
}
/**
* Sets the option "-f".
*
* @param value The option value, may be null.
*/
public void setDescriptiveFieldNames( Boolean value )
{
this.descriptiveFieldNames = value;
}
/**
* Sets the option "-ns".
*
* @param value The option value, may be null.
*/
public void setNodeParentClass( String value )
{
this.nodeParentClass = value;
}
/**
* Sets the option "-pp".
*
* @param value The option value, may be null.
*/
public void setParentPointers( Boolean value )
{
this.parentPointers = value;
}
/**
* Sets the option "-tk".
*
* @param value The option value, may be null.
*/
public void setSpecialTokens( Boolean value )
{
this.specialTokens = value;
}
/**
* Sets the toolkit option "-scheme".
*
* @param value The option value, may be null.
*/
public void setScheme( Boolean value )
{
this.scheme = value;
}
/**
* Sets the toolkit option "-printer".
*
* @param value The option value, may be null.
*/
public void setPrinter( Boolean value )
{
this.printer = value;
}
/**
* {@inheritDoc}
*/
protected int execute()
throws Exception
{
String[] args = generateArguments();
if ( this.outputDirectory != null && !this.outputDirectory.exists() )
{
this.outputDirectory.mkdirs();
}
// fork JTB because of its lack to re-initialize its static parser
ForkedJvm jvm = new ForkedJvm();
jvm.setMainClass( "EDU.purdue.jtb.JTB" );
jvm.addArguments( args );
jvm.setSystemOut( new MojoLogStreamConsumer( false ) );
jvm.setSystemErr( new MojoLogStreamConsumer( true ) );
if ( getLog().isDebugEnabled() )
{
getLog().debug( "Forking: " + jvm );
}
int exitcode = jvm.run();
moveJavaFiles();
return exitcode;
}
/**
* Assembles the command line arguments for the invocation of JTB according to the configuration.
*
* @return A string array that represents the command line arguments to use for JTB.
*/
private String[] generateArguments()
{
List argsList = new ArrayList();
argsList.add( "-np" );
argsList.add( getEffectiveNodePackageName() );
argsList.add( "-vp" );
argsList.add( getEffectiveVisitorPackageName() );
if ( this.supressErrorChecking != null && this.supressErrorChecking.booleanValue() )
{
argsList.add( "-e" );
}
if ( this.javadocFriendlyComments != null && this.javadocFriendlyComments.booleanValue() )
{
argsList.add( "-jd" );
}
if ( this.descriptiveFieldNames != null && this.descriptiveFieldNames.booleanValue() )
{
argsList.add( "-f" );
}
if ( this.nodeParentClass != null )
{
argsList.add( "-ns" );
argsList.add( this.nodeParentClass );
}
if ( this.parentPointers != null && this.parentPointers.booleanValue() )
{
argsList.add( "-pp" );
}
if ( this.specialTokens != null && this.specialTokens.booleanValue() )
{
argsList.add( "-tk" );
}
if ( this.scheme != null && this.scheme.booleanValue() )
{
argsList.add( "-scheme" );
}
if ( this.printer != null && this.printer.booleanValue() )
{
argsList.add( "-printer" );
}
File outputFile = getOutputFile();
if ( outputFile != null )
{
argsList.add( "-o" );
argsList.add( outputFile.getAbsolutePath() );
}
if ( this.inputFile != null )
{
argsList.add( this.inputFile.getAbsolutePath() );
}
return (String[]) argsList.toArray( new String[argsList.size()] );
}
/**
* Gets the last identifier from the specified package name. For example, returns "apache" upon input of
* "org.apache". JTB uses this approach to derive the output directories for the visitor and syntax tree files.
*
* @param name The package name from which to retrieve the last sub package, may be null.
* @return The name of the last sub package or null if the input was null
*/
private String getLastPackageName( String name )
{
if ( name != null )
{
return name.substring( name.lastIndexOf( '.' ) + 1 );
}
return null;
}
/**
* Moves the previously generated Java files to their proper target directories. JTB simply assumes that the current
* working directory represents the parent package of the configured node/visitor packages which does not meet our
* needs.
*
* @throws IOException If the move failed.
*/
private void moveJavaFiles()
throws IOException
{
File nodeSrcDir = new File( getLastPackageName( getEffectiveNodePackageName() ) ).getAbsoluteFile();
File nodeDstDir = getEffectiveNodeDirectory();
moveDirectory( nodeSrcDir, nodeDstDir );
File visitorSrcDir = new File( getLastPackageName( getEffectiveVisitorPackageName() ) ).getAbsoluteFile();
File visitorDstDir = getEffectiveVisitorDirectory();
moveDirectory( visitorSrcDir, visitorDstDir );
}
/**
* Moves all Java files generated by JTB from the specified source directory to the given target directory. Existing
* files in the target directory will be overwritten. Note that this move assumes a flat source directory, i.e.
* copying of sub directories is not supported.
This method must be used instead of
* {@link java.io.File#renameTo(java.io.File)} which would fail if the target directory already existed (at least on
* Windows).
*
* @param sourceDir The absolute path to the source directory, must not be null.
* @param targetDir The absolute path to the target directory, must not be null.
* @throws IOException If the move failed.
*/
private void moveDirectory( File sourceDir, File targetDir )
throws IOException
{
getLog().debug( "Moving JTB output files: " + sourceDir + " -> " + targetDir );
/*
* NOTE: The source directory might be the current working directory if JTB was told to output into the default
* package. The current working directory might be quite anything and will likely contain sub directories not
* created by JTB. Therefore, we do a defensive move and only delete the expected Java source files.
*/
File[] sourceFiles = sourceDir.listFiles();
if ( sourceFiles == null )
{
return;
}
for ( int i = 0; i < sourceFiles.length; i++ )
{
File sourceFile = sourceFiles[i];
if ( sourceFile.isFile() && sourceFile.getName().endsWith( ".java" ) )
{
try
{
FileUtils.copyFileToDirectory( sourceFile, targetDir );
if ( !sourceFile.delete() )
{
getLog().error( "Failed to delete original JTB output file: " + sourceFile );
}
}
catch ( Exception e )
{
throw new IOException( "Failed to move JTB output file: " + sourceFile + " -> " + targetDir );
}
}
}
if ( sourceDir.list().length <= 0 )
{
if ( !sourceDir.delete() )
{
getLog().error( "Failed to delete original JTB output directory: " + sourceDir );
}
}
else
{
getLog().debug( "Keeping non empty JTB output directory: " + sourceDir );
}
}
/**
* Gets a string representation of the command line arguments.
*
* @return A string representation of the command line arguments.
*/
public String toString()
{
return Arrays.asList( generateArguments() ).toString();
}
/**
* Consume and log command line output from the JJDoc process.
*/
class MojoLogStreamConsumer
implements StreamConsumer
{
/**
* The line prefix used by JTB to report infos.
*/
private static final String INFO_PREFIX = "JTB: ";
/**
* Determines if the stream consumer is being used for System.out or System.err.
*/
private boolean err;
/**
* Single param constructor.
*
* @param error If set to true, all consumed lines will be logged at the error level.
*/
public MojoLogStreamConsumer( boolean error )
{
this.err = error;
}
/**
* Consume a line of text.
*
* @param line The line to consume.
*/
public void consumeLine( String line )
{
if ( line.startsWith( "JTB version" ) )
{
getLog().debug( line );
}
else if ( line.startsWith( INFO_PREFIX ) )
{
getLog().debug( line.substring( INFO_PREFIX.length() ) );
}
else if ( this.err && line.length() > 0 )
{
getLog().error( line );
}
else
{
getLog().debug( line );
}
}
}
}
