forked from jasder/antlr
Updated Mojo documentation
This commit is contained in:
Sam Harwell
parent
8e738dad52
commit
502f0802fa
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@ -66,10 +66,9 @@ import java.util.Map;
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import java.util.Set;
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/**
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* Goal that picks up all the ANTLR grammars in a project and moves those that
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* are required for generation of the compilable sources into the location
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* that we use to compile them, such as {@code target/generated-sources/antlr4}.
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*
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* Parses ANTLR 4 grammar files {@code *.g4} and transforms them into Java
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* source files.
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*
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* @author Sam Harwell
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*/
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@Mojo(
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@ -84,8 +83,8 @@ public class Antlr4Mojo extends AbstractMojo {
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//
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/**
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* If set to true then the ANTLR tool will generate a description of the atn
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* for each rule in <a href="http://www.graphviz.org">Dot format</a>
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* If set to true then the ANTLR tool will generate a description of the ATN
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* for each rule in <a href="http://www.graphviz.org">Dot format</a>.
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*/
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@Parameter(property = "antlr4.atn", defaultValue = "false")
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protected boolean atn;
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@ -97,25 +96,25 @@ public class Antlr4Mojo extends AbstractMojo {
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protected String encoding;
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/**
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* generate parse tree listener (default)
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* Generate parse tree listener interface and base class.
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*/
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@Parameter(property = "antlr4.listener", defaultValue = "true")
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protected boolean listener;
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/**
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* generate parse tree visitor
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* Generate parse tree visitor interface and base class.
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*/
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@Parameter(property = "antlr4.visitor", defaultValue = "false")
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protected boolean visitor;
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/**
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* treat warnings as errors
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* Treat warnings as errors.
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*/
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@Parameter(property = "antlr4.treatWarningsAsErrors", defaultValue = "false")
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protected boolean treatWarningsAsErrors;
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/**
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* use the ATN simulator for all predictions
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* Use the ATN simulator for all predictions.
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*/
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@Parameter(property = "antlr4.forceATN", defaultValue = "false")
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protected boolean forceATN;
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@ -135,38 +134,37 @@ public class Antlr4Mojo extends AbstractMojo {
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protected List<String> arguments;
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/* --------------------------------------------------------------------
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* The following are Maven specific parameters, rather than specificlly
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* The following are Maven specific parameters, rather than specific
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* options that the ANTLR tool can use.
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*/
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/**
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* Provides an explicit list of all the grammars that should
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* be included in the generate phase of the plugin. Note that the plugin
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* is smart enough to realize that imported grammars should be included but
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* not acted upon directly by the ANTLR Tool.
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*
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* Unless otherwise specified, the include list scans for and includes all
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* files that end in ".g" in any directory beneath src/main/antlr4. Note that
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* this version of the plugin looks for the directory antlr4 and not the directory
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* antlr, so as to avoid clashes and confusion for projects that use both v3 and v4 grammars
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* such as ANTLR itself.
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*/
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/**
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* Provides an explicit list of all the grammars that should be included in
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* the generate phase of the plugin. Note that the plugin is smart enough to
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* realize that imported grammars should be included but not acted upon
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* directly by the ANTLR Tool.
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* <p/>
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* A set of Ant-like inclusion patterns used to select files from the source
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* directory for processing. By default, the pattern
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* <code>**/*.g4</code> is used to select grammar files.
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*/
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@Parameter
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protected Set<String> includes = new HashSet<String>();
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/**
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* Provides an explicit list of any grammars that should be excluded from
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* the generate phase of the plugin. Files listed here will not be sent for
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* processing by the ANTLR tool.
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* A set of Ant-like exclusion patterns used to prevent certain files from
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* being processed. By default, this set is empty such that no files are
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* excluded.
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*/
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@Parameter
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protected Set<String> excludes = new HashSet<String>();
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/**
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* The current Maven project.
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*/
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@Parameter(property = "project", required = true, readonly = true)
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protected MavenProject project;
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/**
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* Specifies the ANTLR directory containing grammar files.
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* The directory where the ANTLR grammar files ({@code *.g4}) are located.
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*/
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@Parameter(defaultValue = "${basedir}/src/main/antlr4")
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private File sourceDirectory;
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@ -178,7 +176,7 @@ public class Antlr4Mojo extends AbstractMojo {
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private File outputDirectory;
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/**
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* Specify location of grammars and tokens files.
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* Specify location of imported grammars and tokens files.
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*/
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@Parameter(defaultValue = "${basedir}/src/main/antlr4/imports")
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private File libDirectory;
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@ -207,42 +205,28 @@ public class Antlr4Mojo extends AbstractMojo {
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/**
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* The main entry point for this Mojo, it is responsible for converting
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* ANTLR 4.x grammars into the target language specified by the grammar.
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*
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* @throws MojoExecutionException When something is discovered such as a missing source
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* @throws MojoFailureException When something really bad happens such as not being able to create the ANTLR Tool
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*
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* @throws MojoExecutionException if a configuration or grammar error causes
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* the code generation process to fail
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* @throws MojoFailureException if an instance of the ANTLR 4 {@link Tool}
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* cannot be created
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*/
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@Override
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public void execute() throws MojoExecutionException, MojoFailureException {
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Log log = getLog();
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// Check to see if the user asked for debug information, then dump all the
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// parameters we have picked up if they did.
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//
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if (log.isDebugEnabled()) {
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// Excludes
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//
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for (String e : excludes) {
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log.debug("ANTLR: Exclude: " + e);
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}
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// Includes
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//
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for (String e : includes) {
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log.debug("ANTLR: Include: " + e);
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}
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// Output location
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//
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log.debug("ANTLR: Output: " + outputDirectory);
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// Library directory
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//
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log.debug("ANTLR: Library: " + libDirectory);
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// Flags
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//
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}
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if (!sourceDirectory.isDirectory()) {
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@ -363,7 +347,7 @@ public class Antlr4Mojo extends AbstractMojo {
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/**
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*
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* @param sourceDirectory
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* @throws org.codehaus.plexus.compiler.util.scan.InclusionScanException
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* @throws InclusionScanException
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*/
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@NotNull
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private List<List<String>> processGrammarFiles(List<String> args, File sourceDirectory) throws InclusionScanException {
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@ -445,7 +429,7 @@ public class Antlr4Mojo extends AbstractMojo {
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* relative to the base of the output directory and reflect the input
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* organization of the grammar files.
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*
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* @param sourceDirectory The source directory File object
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* @param sourceDirectory The source directory {@link File} object
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* @param grammarFileName The full path to the input grammar file
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* @return The path to the grammar file relative to the source directory
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*/
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@ -1,8 +1,8 @@
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Imported Grammar Files
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In order to have the ANTLR plugin automatically locate and use grammars used
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as imports in your main .g4 files, you need to place the imported grammar
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files in the imports directory beneath the root directory of your grammar
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as imports in your main <<<.g4>>> files, you need to place the imported grammar
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files in the <<<imports>>> directory beneath the root directory of your grammar
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files (which is <<<src/main/antlr4>>> by default of course).
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For a default layout, place your import grammars in the directory: <<<src/main/antlr4/imports>>>
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@ -2,23 +2,23 @@ Libraries
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The introduction of the import directive in a grammar allows reuse of common grammar files
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as well as the ability to divide up functional components of large grammars. However it has
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caused some confusion in regard to the fact that generated vocab files (<<<xxx.tokens>>>) can also
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caused some confusion in regard to the fact that generated vocabulary files (<<<*.tokens>>>) can also
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be searched for with the <<<<libDirectory>>>> directive.
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This has confused two separate functions and imposes a structure upon the layout of
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your grammar files in certain cases. If you have grammars that both use the import
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directive and also require the use of a vocab file then you will need to locate
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the grammar that generates the .tokens file alongside the grammar that uses it. This
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directive and also require the use of a vocabulary file then you will need to locate
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the grammar that generates the <<<.tokens>>> file alongside the grammar that uses it. This
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is because you will need to use the <<<<libDirectory>>>> directive to specify the
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location of your imported grammars and ANTLR will not find any vocab files in
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location of your imported grammars and ANTLR will not find any vocabulary files in
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this directory.
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The .tokens files for any grammars are generated within the same output directory structure
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as the .java files. So, whereever the .java files are generated, you will also find the .tokens
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files. ANTLR looks for .tokens files in both the <<<<libDirectory>>>> and the output directory
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where it is placing the geenrated .java files. Hence when you locate the grammars that generate
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.tokens files in the same source directory as the ones that use the .tokens files, then
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the Maven plugin will find the expected .tokens files.
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The <<<.tokens>>> files for any grammars are generated within the same output directory structure
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as the <<<.java>>> files. So, wherever the <<<.java>>> files are generated, you will also find the <<<.tokens>>>
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files. ANTLR looks for <<<.tokens>>> files in both the <<<<libDirectory>>>> and the output directory
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where it is placing the generated <<<.java>>> files. Hence when you locate the grammars that generate
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<<<.tokens>>> files in the same source directory as the ones that use the <<<.tokens>>> files, then
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the Maven plugin will find the expected <<<.tokens>>> files.
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The <<<<libDirectory>>>> is specified like any other directory parameter in Maven. Here is an
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example:
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@ -30,7 +30,6 @@ Libraries
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<version>4.0-SNAPSHOT</version>
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<executions>
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<execution>
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<configuration>
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<goals>
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@ -1,7 +1,7 @@
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Simple configuration
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If your grammar files are organized into the default locations as described in the {{{../index.html}introduction}},
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then configuring the pom.xml file for your project is as simple as adding this to it
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then configuring the <<<pom.xml>>> file for your project is as simple as adding this to it
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+--
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<plugins>
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@ -21,12 +21,12 @@ Simple configuration
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</plugins>
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+--
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When the mvn command is executed all grammar files under <<<src/main/antlr4>>>, except any
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When the <<<mvn>>> command is executed all grammar files under <<<src/main/antlr4>>>, except any
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import grammars under <<<src/main/antlr4/imports>>> will be analyzed and converted to
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java source code in the output directory <<<target/generated-sources/antlr4>>>.
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Java source code in the output directory <<<target/generated-sources/antlr4>>>.
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Your input files under <<<antlr4>>> should be stored in sub directories that
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reflect the package structure of your java parsers. If your grammar file parser.g4 contains:
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reflect the package structure of your java parsers. If your grammar file <<<parser.g4>>> contains:
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+---
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@header {
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@ -34,7 +34,7 @@ package org.jimi.themuss;
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}
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+---
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Then the .g4 file should be stored in: <<<src/main/antlr4/org/jimi/themuss/parser.g4>>>. THis way
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the generated .java files will correctly reflect the package structure in which they will
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Then the <<<.g4>>> file should be stored in: <<<src/main/antlr4/org/jimi/themuss/parser.g4>>>. This way
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the generated <<<.java>>> files will correctly reflect the package structure in which they will
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finally rest as classes.
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@ -0,0 +1 @@
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FAQ
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@ -28,7 +28,7 @@ ANTLR v4 Maven plugin
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use version 4.0 of the plugin, you will build your grammars using version 4.0 of the
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ANTLR tool, version 4.2 of the plugin will use version 4.2 of the ANTLR tool and so on.
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You may also find that there are patch versions of the plugin suchas 4.0-1 4.0-2 and
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You may also find that there are patch versions of the plugin such as 4.0-1 4.0-2 and
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so on. Use the latest patch release of the plugin.
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The current version of the plugin is shown at the top of this page after the <<Last Deployed>> date.
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@ -49,10 +49,10 @@ ANTLR v4 Maven plugin
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+--- imports/ .g4 files that are imported by other grammars.
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+--
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If your grammar is intended to be part of a package called org.foo.bar then you would
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If your grammar is intended to be part of a package called <<<org.foo.bar>>> then you would
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place it in the directory <<<src/main/antlr4/org/foo/bar>>>. The plugin will then produce
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.java and .tokens files in the output directory <<<target/generated-sources/antlr4/org/foo/bar>>>
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When the Java files are compiled they will be in the correct location for the javac
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<<<.java>>> and <<<.tokens>>> files in the output directory <<<target/generated-sources/antlr4/org/foo/bar>>>
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When the Java files are compiled they will be in the correct location for the Javac
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compiler without any special configuration. The generated java files are automatically
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submitted for compilation by the plugin.
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@ -60,4 +60,3 @@ ANTLR v4 Maven plugin
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any grammar files that are imported by other grammar files (do not make subdirectories here.)
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Such files are never built on their own, but the plugin will automatically tell the ANTLR
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tool to look in this directory for library files.
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@ -1,193 +1,59 @@
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Usage
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The Maven plugin for antlr is simple to use but is at its simplest when you use the default
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layouts for your grammars, as so:
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The ANTLR 4 plugin for Maven can generate parsers for any number of grammars in
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your project.
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* Compiling Grammars into Parsers
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By default, the <<<{{{./antlr-mojo.html}antlr}}>>> goal will search for grammar
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files in the directory <<<$\{basedir\}/src/main/antlr4>>> and any additional
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<<<.tokens>>> files in the directory <<<$\{basedir\}/src/main/antlr4/imports>>>.
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This can be configured to search other directories using the plugin configuration
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parameters as described in the <<<{{{./antlr-mojo.html}antlr}}>>> goal
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documentation.
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The following figure shows the expected layout of files for the default
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configuration of this plugin.
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+--
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src/main/
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+--- antlr4/... .g4 files organized in the required package structure
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+--- antlr4/... .g4 files organized in the required package structure
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|
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+--- imports/ .g4 files that are imported by other grammars.
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+--- imports/ user-created .tokens files and .g4 files that are imported by other grammars
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+--
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However, if you are not able to use this structure for whatever reason, you
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can configure the locations of the grammar files, where library/import files
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are located and where the output files should be generated.
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* Plugin Descriptor
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The current version of the plugin is shown at the top of this page after the <<Last Deployed>> date.
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The full layout of the descriptor (at least, those parts that are not standard Maven things),
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showing the default values of the configuration options, is as follows:
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The next step is to configure your POM to call the plugin. The goals will
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normally run during the generate-sources phase of the build. Examples of how to
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configure your POM can be found on the various examples pages, reachable via
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the page menu. If you stick with the default values, the snippet below will
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suffice:
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+--
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<plugin>
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<groupId>org.antlr</groupId>
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<artifactId>antlr4-maven-plugin</artifactId>
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<version>4.0-SNAPSHOT</version>
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<executions>
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<execution>
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<configuration>
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<goals>
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<goal>antlr</goal>
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</goals>
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<conversionTimeout>10000</conversionTimeout>
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<debug>false</debug>
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<dfa>false</dfa>
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<nfa>false</nfa>
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<excludes><exclude/></excludes>
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<includes><include/></includes>
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<libDirectory>src/main/antlr4/imports</libDirectory>
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<messageFormat>antlr</messageFormat>
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<outputDirectory>target/generated-sources/antlr4</outputDirectory>
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<printGrammar>false</printGrammar>
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<profile>false</profile>
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<report>false</report>
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<sourceDirectory>src/main/antlr4</sourceDirectory>
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<trace>false</trace>
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<verbose>true</verbose>
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</configuration>
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</execution>
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</executions>
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</plugin>
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<project>
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...
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<build>
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<plugins>
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<plugin>
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<groupId>org.antlr</groupId>
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<artifactId>antlr4-maven-plugin</artifactId>
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<version>${project.version}</version>
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<executions>
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<execution>
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<id>antlr</id>
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<goals>
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<goal>antlr</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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...
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</build>
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...
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</project>
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+--
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Note that you can create multiple executions, and thus build some grammars with different
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options to others (such as setting the debug option for instance).
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** Configuration parameters
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*** report
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If set to true, then after the tool has processed an input grammar file
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it will report variaous statistics about the parser, such as information
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on cyclic DFAs, which rules may use backtracking, and so on.
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default-value="false"
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*** printGrammar
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If set to true, then the ANTLR tool will print a version of the input
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grammar which is devoid of any actions that may be present in the input file.
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default-value = "false"
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*** debug
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If set to true, then the code generated by the ANTLR code generator will
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be set to debug mode. This means that when run, the code will 'hang' and
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wait for a debug connection on a TCP port (49100 by default).
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default-value="false"
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*** profile
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If set to true, then then the generated parser will compute and report on
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profile information at runtime.
|
||||
|
||||
default-value="false"
|
||||
|
||||
*** nfa
|
||||
|
||||
If set to true then the ANTLR tool will generate a description of the nfa
|
||||
for each rule in <a href="http://www.graphviz.org">Dot format</a>
|
||||
|
||||
default-value="false"
|
||||
|
||||
protected boolean nfa;
|
||||
|
||||
*** dfa
|
||||
|
||||
If set to true then the ANTLR tool will generate a description of the DFA
|
||||
for each decision in the grammar in <a href="http://www.graphviz.org">Dot format</a>
|
||||
|
||||
default-value="false"
|
||||
|
||||
*** trace
|
||||
|
||||
If set to true, the generated parser code will log rule entry and exit points
|
||||
to stdout as an aid to debugging.
|
||||
|
||||
default-value="false"
|
||||
|
||||
*** messageFormat
|
||||
|
||||
If this parameter is set, it indicates that any warning or error messages returned
|
||||
by ANLTR, shoould be formatted in the specified way. Currently, ANTLR supports the
|
||||
built-in formats of antlr, gnu and vs2005.
|
||||
|
||||
default-value="antlr"
|
||||
|
||||
*** verbose
|
||||
|
||||
If this parameter is set to true, then ANTLR will report all sorts of things
|
||||
about what it is doing such as the names of files and the version of ANTLR and so on.
|
||||
|
||||
default-value="true"
|
||||
|
||||
*** conversionTimeout
|
||||
|
||||
The number of milliseconds ANTLR will wait for analysis of each
|
||||
alternative in the grammar to complete before giving up. You may raise
|
||||
this value if ANTLR gives up on a complicated alt and tells you that
|
||||
there are lots of ambiguties, but you know that it just needed to spend
|
||||
more time on it. Note that this is an absolute time and not CPU time.
|
||||
|
||||
default-value="10000"
|
||||
|
||||
*** includes
|
||||
|
||||
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.
|
||||
|
||||
Unless otherwise specified, the include list scans for and includes all
|
||||
files that end in ".g4" in any directory beneath src/main/antlr4. Note that
|
||||
this version of the plugin looks for the directory antlr4 and not the directory
|
||||
antlr, so as to avoid clashes and confusion for projects that use both v3 and v4 grammars
|
||||
such as ANTLR itself.
|
||||
|
||||
*** excludes
|
||||
|
||||
Provides an explicit list of any grammars that should be excluded from
|
||||
the generate phase of the plugin. Files listed here will not be sent for
|
||||
processing by the ANTLR tool.
|
||||
|
||||
*** sourceDirectory
|
||||
|
||||
Specifies the Antlr directory containing grammar files. For
|
||||
antlr version 4.x we default this to a directory in the tree
|
||||
called antlr4 because the antlr directory is occupied by version
|
||||
2.x grammars.
|
||||
|
||||
<<NB>> Take careful note that the default location for antlr grammars
|
||||
is now <<antlr4>> and NOT <<antlr>>
|
||||
|
||||
default-value="<<<${basedir}/src/main/antlr4>>>"
|
||||
|
||||
*** outputDirectory
|
||||
|
||||
Location for generated Java files. For antlr version 4.x we default
|
||||
this to a directory in the tree called antlr4 because the antlr
|
||||
directory is occupied by version 2.x grammars.
|
||||
|
||||
default-value="<<<${project.build.directory}/generated-sources/antlr4>>>"
|
||||
|
||||
*** libDirectory
|
||||
|
||||
Location for imported token files, e.g. <code>.tokens</code> and imported grammars.
|
||||
Note that ANTLR will not try to process grammars that it finds in this directory, but
|
||||
will include this directory in the search for .tokens files and import grammars.
|
||||
|
||||
<<NB>> If you change the lib directory from the default but the directory is
|
||||
still under<<<${basedir}/src/main/antlr4>>>, then you will need to exclude
|
||||
the grammars from processing specifically, using the <<<<excludes>>>> option.
|
||||
|
||||
default-value="<<<${basedir}/src/main/antlr4/imports>>>"
|
||||
|
||||
Note that you can create multiple executions, and thus build some grammars with
|
||||
different options to others (such as setting the <<<debug>>> option for
|
||||
instance).
|
||||
|
|
|
|||
|
|
@ -17,7 +17,9 @@
|
|||
|
||||
<menu name="Overview">
|
||||
<item name="Introduction" href="index.html"/>
|
||||
<item name="Goals" href="plugin-info.html"/>
|
||||
<item name="Usage" href="usage.html"/>
|
||||
<item name="FAQ" href="faq.html"/>
|
||||
</menu>
|
||||
|
||||
<menu name="Examples">
|
||||
|
|
|
|||
Loading…
Reference in New Issue