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Maven plugin for ANTLR 4 grammars
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/*
* Copyright (c) 2012 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD-3-Clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.mojo.antlr4;
import org.antlr.v4.Tool;
import org.antlr.v4.codegen.CodeGenerator;
import org.antlr.v4.runtime.misc.MultiMap;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Utils;
import org.antlr.v4.tool.Grammar;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.plugins.annotations.Component;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.annotations.ResolutionScope;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.compiler.util.scan.InclusionScanException;
import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
import org.codehaus.plexus.compiler.util.scan.mapping.SourceMapping;
import org.codehaus.plexus.compiler.util.scan.mapping.SuffixMapping;
import org.sonatype.plexus.build.incremental.BuildContext;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Parses ANTLR 4 grammar files {@code *.g4} and transforms them into Java
* source files.
*
* @author Sam Harwell
*/
@Mojo(
name = "antlr4",
defaultPhase = LifecyclePhase.GENERATE_SOURCES,
requiresDependencyResolution = ResolutionScope.COMPILE,
requiresProject = true)
public class Antlr4Mojo extends AbstractMojo {
// First, let's deal with the options that the ANTLR tool itself
// can be configured by.
//
/**
* If set to true then the ANTLR tool will generate a description of the ATN
* for each rule in Dot format.
*/
@Parameter(property = "antlr4.atn", defaultValue = "false")
protected boolean atn;
/**
* specify grammar file encoding; e.g., euc-jp
*/
@Parameter(property = "project.build.sourceEncoding")
protected String inputEncoding;
/**
* specify output file encoding; defaults to source encoding
*/
@Parameter(property = "project.build.sourceEncoding")
protected String outputEncoding;
/**
* Generate parse tree listener interface and base class.
*/
@Parameter(property = "antlr4.listener", defaultValue = "true")
protected boolean listener;
/**
* Generate parse tree visitor interface and base class.
*/
@Parameter(property = "antlr4.visitor", defaultValue = "false")
protected boolean visitor;
/**
* Treat warnings as errors.
*/
@Parameter(property = "antlr4.treatWarningsAsErrors", defaultValue = "false")
protected boolean treatWarningsAsErrors;
/**
* Use the ATN simulator for all predictions.
*/
@Parameter(property = "antlr4.forceATN", defaultValue = "false")
protected boolean forceATN;
/**
* A list of grammar options to explicitly specify to the tool. These
* options are passed to the tool using the
* -D<option>=<value> syntax.
*/
@Parameter
protected Map options;
/**
* A list of additional command line arguments to pass to the ANTLR tool.
*/
@Parameter
protected List arguments;
/* --------------------------------------------------------------------
* The following are Maven specific parameters, rather than specific
* options that the ANTLR tool can use.
*/
/**
* Provides an explicit list of all the grammars that should be included in
* the generate phase of the plugin. Note that the plugin is smart enough to
* realize that imported grammars should be included but not acted upon
* directly by the ANTLR Tool.
*
* A set of Ant-like inclusion patterns used to select files from the source
* directory for processing. By default, the pattern
* **/*.g4 is used to select grammar files.
*
*/
@Parameter
protected Set includes = new HashSet();
/**
* A set of Ant-like exclusion patterns used to prevent certain files from
* being processed. By default, this set is empty such that no files are
* excluded.
*/
@Parameter
protected Set excludes = new HashSet();
/**
* The current Maven project.
*/
@Parameter(property = "project", required = true, readonly = true)
protected MavenProject project;
/**
* Specifies whether sources are added to the {@code compile} or
* {@code test} scope.
*/
@Parameter(property = "antlr4.generateTestSources", defaultValue = "false")
private boolean generateTestSources;
/**
* The directory where the ANTLR grammar files ({@code *.g4}) are located.
*/
@Parameter(defaultValue = "${basedir}/src/main/antlr4")
private File sourceDirectory;
/**
* Specify output directory where the Java files are generated.
*/
@Parameter(defaultValue = "${project.build.directory}/generated-sources/antlr4")
private File outputDirectory;
/**
* Specify location of imported grammars and tokens files.
*/
@Parameter(defaultValue = "${basedir}/src/main/antlr4/imports")
private File libDirectory;
/**
* The directory where build status information is located.
*/
@Parameter(defaultValue = "${project.build.directory}/maven-status/antlr4", readonly=true)
private File statusDirectory;
@Component
private BuildContext buildContext;
public File getSourceDirectory() {
return sourceDirectory;
}
public File getOutputDirectory() {
return outputDirectory;
}
public File getLibDirectory() {
return libDirectory;
}
void addSourceRoot(File outputDir) {
if (generateTestSources) {
project.addTestCompileSourceRoot(outputDir.getPath());
}
else {
project.addCompileSourceRoot(outputDir.getPath());
}
}
/**
* An instance of the ANTLR tool build
*/
protected Tool tool;
/**
* The main entry point for this Mojo, it is responsible for converting
* ANTLR 4.x grammars into the target language specified by the grammar.
*
* @exception MojoExecutionException if a configuration or grammar error causes
* the code generation process to fail
* @exception MojoFailureException if an instance of the ANTLR 4 {@link Tool}
* cannot be created
*/
@Override
public void execute() throws MojoExecutionException, MojoFailureException {
Log log = getLog();
outputEncoding = validateEncoding(outputEncoding);
if (log.isDebugEnabled()) {
for (String e : excludes) {
log.debug("ANTLR: Exclude: " + e);
}
for (String e : includes) {
log.debug("ANTLR: Include: " + e);
}
log.debug("ANTLR: Output: " + outputDirectory);
log.debug("ANTLR: Library: " + libDirectory);
}
if (!sourceDirectory.isDirectory()) {
log.info("No ANTLR 4 grammars to compile in " + sourceDirectory.getAbsolutePath());
return;
}
// Ensure that the output directory path is all in tact so that
// ANTLR can just write into it.
//
File outputDir = getOutputDirectory();
if (!outputDir.exists()) {
outputDir.mkdirs();
}
GrammarDependencies dependencies = new GrammarDependencies(sourceDirectory, libDirectory, arguments, getDependenciesStatusFile(), getLog());
// Now pick up all the files and process them with the Tool
//
List> argumentSets;
Set grammarFiles;
Set importGrammarFiles;
try {
List args = getCommandArguments();
grammarFiles = getGrammarFiles(sourceDirectory);
importGrammarFiles = getImportFiles(sourceDirectory);
argumentSets = processGrammarFiles(args, grammarFiles, dependencies, sourceDirectory);
} catch (Exception e) {
log.error(e);
throw new MojoExecutionException("Fatal error occured while evaluating the names of the grammar files to analyze", e);
}
log.debug("Output directory base will be " + outputDirectory.getAbsolutePath());
log.info("ANTLR 4: Processing source directory " + sourceDirectory.getAbsolutePath());
for (List args : argumentSets) {
try {
// Create an instance of the ANTLR 4 build tool
tool = new CustomTool(args.toArray(new String[args.size()]));
} catch (Exception e) {
log.error("The attempt to create the ANTLR 4 build tool failed, see exception report for details", e);
throw new MojoFailureException("Error creating an instanceof the ANTLR tool.", e);
}
try {
dependencies.analyze(grammarFiles, importGrammarFiles, tool);
} catch (Exception e) {
log.error("Dependency analysis failed, see exception report for details",
e);
throw new MojoFailureException("Dependency analysis failed.", e);
}
// Set working directory for ANTLR to be the base source directory
tool.inputDirectory = sourceDirectory;
tool.processGrammarsOnCommandLine();
// If any of the grammar files caused errors but did nto throw exceptions
// then we should have accumulated errors in the counts
if (tool.getNumErrors() > 0) {
throw new MojoExecutionException("ANTLR 4 caught " + tool.getNumErrors() + " build errors.");
}
}
if (project != null) {
// Tell Maven that there are some new source files underneath the output directory.
addSourceRoot(this.getOutputDirectory());
}
try {
dependencies.save();
} catch (IOException ex) {
log.warn("Could not save grammar dependency status", ex);
}
}
private List getCommandArguments() {
List args = new ArrayList();
if (getOutputDirectory() != null) {
args.add("-o");
args.add(outputDirectory.getAbsolutePath());
}
// Where do we want ANTLR to look for .tokens and import grammars?
if (getLibDirectory() != null && getLibDirectory().isDirectory()) {
args.add("-lib");
args.add(libDirectory.getAbsolutePath());
}
// Next we need to set the options given to us in the pom into the
// tool instance we have created.
if (atn) {
args.add("-atn");
}
if ( inputEncoding!=null && !inputEncoding.isEmpty()) {
args.add("-encoding");
outputEncoding = inputEncoding;
args.add(inputEncoding);
}
if (listener) {
args.add("-listener");
}
else {
args.add("-no-listener");
}
if (visitor) {
args.add("-visitor");
}
else {
args.add("-no-visitor");
}
if (treatWarningsAsErrors) {
args.add("-Werror");
}
if (forceATN) {
args.add("-Xforce-atn");
}
if (options != null) {
for (Map.Entry option : options.entrySet()) {
args.add(String.format("-D%s=%s", option.getKey(), option.getValue()));
}
}
if (arguments != null) {
args.addAll(arguments);
}
return args;
}
/**
*
* @param sourceDirectory
* @exception InclusionScanException
*/
@NotNull
private List> processGrammarFiles(
List args,
Set grammarFiles,
GrammarDependencies dependencies,
File sourceDirectory) throws InclusionScanException, IOException {
// We don't want the plugin to run for every grammar, regardless of whether
// it's changed since the last compilation. Check the mtime of the tokens vs
// the grammar file mtime to determine whether we even need to execute.
Set grammarFilesToProcess = new HashSet();
for (File grammarFile : grammarFiles) {
String tokensFileName = grammarFile.getName().split("\\.")[0] + ".tokens";
File outputFile = new File(outputDirectory, tokensFileName);
if ( (! outputFile.exists()) ||
outputFile.lastModified() <= grammarFile.lastModified() ||
dependencies.isDependencyChanged(grammarFile)) {
grammarFilesToProcess.add(grammarFile);
}
}
grammarFiles = grammarFilesToProcess;
if (grammarFiles.isEmpty()) {
getLog().info("No grammars to process");
return Collections.emptyList();
}
MultiMap grammarFileByFolder = new MultiMap();
// Iterate each grammar file we were given and add it into the tool's list of
// grammars to process.
for (File grammarFile : grammarFiles) {
buildContext.refresh(grammarFile);
buildContext.removeMessages(grammarFile);
getLog().debug("Grammar file '" + grammarFile.getPath() + "' detected.");
String relPathBase = MojoUtils.findSourceSubdir(sourceDirectory, grammarFile);
String relPath = relPathBase + grammarFile.getName();
getLog().debug(" ... relative path is: " + relPath);
grammarFileByFolder.map(relPathBase, grammarFile);
}
List> result = new ArrayList>();
for (Map.Entry> entry : grammarFileByFolder.entrySet()) {
List folderArgs = new ArrayList(args);
if (!folderArgs.contains("-package") && !entry.getKey().isEmpty()) {
folderArgs.add("-package");
folderArgs.add(getPackageName(entry.getKey()));
}
for (File file : entry.getValue()) {
folderArgs.add(entry.getKey() + file.getName());
}
result.add(folderArgs);
}
return result;
}
private Set getImportFiles(File sourceDirectory) throws InclusionScanException {
if (!libDirectory.exists()) return Collections.emptySet();
Set includes = new HashSet();
includes.add("*.g4");
includes.add("*.tokens");
SourceInclusionScanner scan = new SimpleSourceInclusionScanner(includes,
Collections.emptySet());
scan.addSourceMapping(new SuffixMapping("G4", "g4"));
return scan.getIncludedSources(libDirectory, null);
}
private Set getGrammarFiles(File sourceDirectory) throws InclusionScanException
{
// Which files under the source set should we be looking for as grammar files
SourceMapping mapping = new SuffixMapping("g4", Collections.emptySet());
// What are the sets of includes (defaulted or otherwise).
Set includes = getIncludesPatterns();
// Now, to the excludes, we need to add the imports directory
// as this is autoscanned for imported grammars and so is auto-excluded from the
// set of grammar fields we should be analyzing.
excludes.add("imports/**");
SourceInclusionScanner scan = new SimpleSourceInclusionScanner(includes, excludes);
scan.addSourceMapping(mapping);
return scan.getIncludedSources(sourceDirectory, null);
}
private static String getPackageName(String relativeFolderPath) {
if (relativeFolderPath.contains("..")) {
throw new UnsupportedOperationException("Cannot handle relative paths containing '..'");
}
List parts = new ArrayList(Arrays.asList(relativeFolderPath.split("[/\\\\\\.]+")));
while (parts.remove("")) {
// intentionally blank
}
return Utils.join(parts.iterator(), ".");
}
public Set getIncludesPatterns() {
if (includes == null || includes.isEmpty()) {
return Collections.singleton("**/*.g4");
}
return includes;
}
private File getDependenciesStatusFile() {
File statusFile = new File(statusDirectory, "dependencies.ser");
if (!statusFile.getParentFile().exists()) {
statusFile.getParentFile().mkdirs();
}
return statusFile;
}
private final class CustomTool extends Tool {
public CustomTool(String[] args) {
super(args);
addListener(new Antlr4ErrorLog(this, buildContext, getLog()));
}
@Override
public void process(Grammar g, boolean gencode) {
getLog().info("Processing grammar: " + g.fileName);
super.process(g, gencode);
}
@Override
public Writer getOutputFileWriter(Grammar g, String fileName) throws IOException {
if (outputDirectory == null) {
return new StringWriter();
}
// output directory is a function of where the grammar file lives
// for subdir/T.g4, you get subdir here. Well, depends on -o etc...
// But, if this is a .tokens file, then we force the output to
// be the base output directory (or current directory if there is not a -o)
//
File outputDir;
if ( fileName.endsWith(CodeGenerator.VOCAB_FILE_EXTENSION) ) {
outputDir = new File(outputDirectory);
}
else {
outputDir = getOutputDirectory(g.fileName);
}
File outputFile = new File(outputDir, fileName);
if (!outputDir.exists()) {
outputDir.mkdirs();
}
URI relativePath = project.getBasedir().toURI().relativize(outputFile.toURI());
getLog().debug(" Writing file: " + relativePath);
OutputStream outputStream = buildContext.newFileOutputStream(outputFile);
if ( outputEncoding!=null && !outputEncoding.isEmpty()) {
return new BufferedWriter(new OutputStreamWriter(outputStream, outputEncoding));
}
else {
return new BufferedWriter(new OutputStreamWriter(outputStream));
}
}
}
/**
* Validates the given encoding.
*
* @return the validated encoding. If {@code null} was provided, returns the platform default encoding.
*/
private String validateEncoding(String encoding) {
return (encoding == null) ? Charset.defaultCharset().name() : Charset.forName(encoding.trim()).name();
}
}
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