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< li class = "sidebarTitle" > PMD 7.8.0-SNAPSHOT< / li >
< div class = "sidebarTitleDate" > Release date: 29-November-2024< / div >
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< li > < a href = "pmd_languages_python.html" > Python< / a > < / li >
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< li > < a href = "pmd_languages_tsql.html" > T-SQL< / a > < / li >
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» How to add a new CPD language
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< div class = "summary" > How to add a new language module with CPD support.< / div >
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< details id = "inline-toc-details" >
< summary > Table of Contents< / summary >
< div id = "inline-toc" > <!-- empty, move TOC here when screen size too small --> < / div >
< / details >
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< h2 id = "adding-support-for-a-cpd-language" > Adding support for a CPD language< / h2 >
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< p > CPD works generically on the tokens produced by a < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/CpdLexer.html#" > < code > CpdLexer< / code > < / a > .
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To add support for a new language, the crucial piece is writing a CpdLexer that
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splits the source file into the tokens specific to your language. Thankfully you
can use a stock < a href = "https://github.com/antlr/grammars-v4" > Antlr grammar< / a > or JavaCC
grammar to generate a lexer for you. If you cannot use a lexer generator, for
instance because you are wrapping a lexer from another library, it is still relatively
easy to implement the Tokenizer interface.< / p >
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< p > Use the following guide to set up a new language module that supports CPD.< / p >
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< ol >
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< li > Create a new Maven module for your language. You can take < a href = "https://github.com/pmd/pmd/tree/main/pmd-go/pom.xml" > the Golang module< / a > as an example.
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< ul >
< li > Make sure to add your new module to the parent pom as < code class = "language-plaintext highlighter-rouge" > < module> < / code > entry, so that it is built alongside the
other languages.< / li >
< li > Also add your new module to the dependencies list in “pmd-languages-deps/pom.xml”, so that the new language
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is automatically available in the binary distribution (pmd-dist).< / li >
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< / ul >
< / li >
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< li > Implement a < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/CpdLexer.html#" > < code > CpdLexer< / code > < / a > .
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< ul >
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< li >
< p > For Antlr grammars you can take the grammar from < a href = "https://github.com/antlr/grammars-v4" > antlr/grammars-v4< / a > and place it in < code class = "language-plaintext highlighter-rouge" > src/main/antlr4< / code > followed by the package name of the language. You then need to call the appropriate ant wrapper to generate
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the lexer from the grammar. To do so, edit < code class = "language-plaintext highlighter-rouge" > pom.xml< / code > (eg like < a href = "https://github.com/pmd/pmd/tree/main/pmd-go/pom.xml" > the Golang module< / a > ).
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Once that is done, < code class = "language-plaintext highlighter-rouge" > mvn generate-sources< / code > should generate the lexer sources for you.< / p >
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< p > You can now implement a CpdLexer, for instance by extending < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/impl/AntlrCpdLexer.html#" > < code > AntlrCpdLexer< / code > < / a > . The following reproduces the Go implementation:
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```java
// mind the package convention if you are going to make a PR
package net.sourceforge.pmd.lang.go.cpd;< / p >
< / li >
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< / ul >
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< p > public class GoCpdLexer extends AntlrCpdLexer {< / p >
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< div class = "language-plaintext highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > @Override
protected Lexer getLexerForSource(CharStream charStream) {
return new GolangLexer(charStream);
} } ```
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< / code > < / pre > < / div > < / div >
< ul >
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< li > If your language is case-insensitive, then you might want to overwrite < code class = "language-plaintext highlighter-rouge" > getImage(AntlrToken)< / code > . There you can
change each token e.g. into uppercase, so that CPD sees the same strings and can find duplicates even when
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the casing differs. See < a href = "https://docs.pmd-code.org/apidocs/pmd-tsql/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/tsql/cpd/TSqlCpdLexer.html#" > < code > TSqlCpdLexer< / code > < / a > for an example. You will also need a
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“CaseChangingCharStream”, so that antlr itself is case-insensitive.< / li >
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< li > For JavaCC grammars, place your grammar in < code class = "language-plaintext highlighter-rouge" > etc/grammar< / code > and edit the < code class = "language-plaintext highlighter-rouge" > pom.xml< / code > like the < a href = "https://github.com/pmd/pmd/blob/main/pmd-python/pom.xml" > Python implementation< / a > does.
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You can then subclass < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/impl/JavaccCpdLexer.html#" > < code > JavaccCpdLexer< / code > < / a > instead of AntlrCpdLexer.< / li >
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< li > If your JavaCC based language is case-insensitive (option < code class = "language-plaintext highlighter-rouge" > IGNORE_CASE=true< / code > ), then you need to implement
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< a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/ast/impl/javacc/JavaccTokenDocument.TokenDocumentBehavior.html#" > < code > JavaccTokenDocument.TokenDocumentBehavior< / code > < / a > , which can change each token
e.g. into uppercase. See < a href = "https://docs.pmd-code.org/apidocs/pmd-plsql/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/plsql/ast/PLSQLParser.html#" > < code > PLSQLParser< / code > < / a > for an example.< / li >
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< li > For any other scenario just implement the interface however you can. Look at the Scala or Apex module for existing implementations.< / li >
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< / ul >
< / li >
< li >
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< p > Create a < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/Language.html#" > < code > Language< / code > < / a > implementation, and make it implement < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/CpdCapableLanguage.html#" > < code > CpdCapableLanguage< / code > < / a > .
If your language only supports CPD, then you can subclass < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/impl/CpdOnlyLanguageModuleBase.html#" > < code > CpdOnlyLanguageModuleBase< / code > < / a > to get going:< / p >
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< div class = "language-java highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "c1" > // mind the package convention if you are going to make a PR< / span >
< span class = "kn" > package< / span > < span class = "nn" > net.sourceforge.pmd.lang.go< / span > < span class = "o" > ;< / span >
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< span class = "kd" > public< / span > < span class = "kd" > class< / span > < span class = "nc" > GoLanguageModule< / span > < span class = "kd" > extends< / span > < span class = "nc" > CpdOnlyLanguageModuleBase< / span > < span class = "o" > {< / span >
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< span class = "c1" > // A public noarg constructor is required.< / span >
< span class = "kd" > public< / span > < span class = "nf" > GoLanguageModule< / span > < span class = "o" > ()< / span > < span class = "o" > {< / span >
< span class = "kd" > super< / span > < span class = "o" > (< / span > < span class = "nc" > LanguageMetadata< / span > < span class = "o" > .< / span > < span class = "na" > withId< / span > < span class = "o" > (< / span > < span class = "s" > "go"< / span > < span class = "o" > ).< / span > < span class = "na" > name< / span > < span class = "o" > (< / span > < span class = "s" > "Go"< / span > < span class = "o" > ).< / span > < span class = "na" > extensions< / span > < span class = "o" > (< / span > < span class = "s" > "go"< / span > < span class = "o" > ));< / span >
< span class = "o" > }< / span >
< span class = "nd" > @Override< / span >
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< span class = "kd" > public< / span > < span class = "nc" > Tokenizer< / span > < span class = "nf" > createCpdLexer< / span > < span class = "o" > (< / span > < span class = "nc" > LanguagePropertyBundle< / span > < span class = "n" > bundle< / span > < span class = "o" > )< / span > < span class = "o" > {< / span >
< span class = "c1" > // This method should return an instance of the CpdLexer you created.< / span >
< span class = "k" > return< / span > < span class = "k" > new< / span > < span class = "nf" > GoCpdLexer< / span > < span class = "o" > ();< / span >
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< span class = "o" > }< / span >
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< span class = "o" > }< / span >
< / code > < / pre > < / div > < / div >
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< p > To make PMD find the language module at runtime, write the fully-qualified name of your language class into the file < code class = "language-plaintext highlighter-rouge" > src/main/resources/META-INF/services/net.sourceforge.pmd.lang.Language< / code > .< / p >
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< p > At this point the new language module should be available in < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/LanguageRegistry.html#CPD" > < code > CPD< / code > < / a > and usable by CPD like any other language.< / p >
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< / li >
< li >
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< p > Update the test that asserts the list of supported languages by updating the < code class = "language-plaintext highlighter-rouge" > SUPPORTED_LANGUAGES< / code > constant in < a href = "https://github.com/pmd/pmd/blob/main/pmd-dist/src/test/java/net/sourceforge/pmd/dist/BinaryDistributionIT.java" > BinaryDistributionIT< / a > .< / p >
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< / li >
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< li >
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< p > Add some tests for your CpdLexer by following the < a href = "#testing-your-implementation" > section below< / a > .< / p >
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< / li >
< li >
< p > Finishing up your new language module by adding a page in the documentation. Create a new markdown file
< code class = "language-plaintext highlighter-rouge" > < langId> .md< / code > in < code class = "language-plaintext highlighter-rouge" > docs/pages/pmd/languages/< / code > . This file should have the following frontmatter:< / p >
< div class = "language-plaintext highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > ---
title: < Language Name>
permalink: pmd_languages_< langId> .html
last_updated: < Month> < Year> (< PMD Version> )
tags: [languages, CpdCapableLanguage]
---
< / code > < / pre > < / div > < / div >
< p > On this page, language specifics can be documented, e.g. when the language was first supported by PMD.
There is also the following Jekyll Include, that creates summary box for the language:< / p >
< div class = "language-plaintext highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code >
{% include language_info.html name='< Language Name> ' id='< langId> ' implementation='< langId> ::lang.< langId> .< langId> LanguageModule' supports_cpd=true %}
< / code > < / pre > < / div > < / div >
< / li >
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< / ol >
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< h3 id = "declaring-cpdlexer-options" > Declaring CpdLexer options< / h3 >
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< p > To make the CpdLexer configurable, first define some property descriptors using
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< a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/properties/PropertyFactory.html#" > < code > PropertyFactory< / code > < / a > . Look at < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/CpdLanguageProperties.html#" > < code > CpdLanguageProperties< / code > < / a >
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for some predefined ones which you can reuse (prefer reusing property descriptors if you can).
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You need to override < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/Language.html#newPropertyBundle()" > < code > newPropertyBundle< / code > < / a >
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and call < code class = "language-plaintext highlighter-rouge" > definePropertyDescriptor< / code > to register the descriptors.
After that you can access the values of the properties from the parameter
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of < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/CpdCapableLanguage.html#createCpdTokenizer(net.sourceforge.pmd.lang.LanguagePropertyBundle)" > < code > createCpdTokenizer< / code > < / a > .< / p >
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< p > To implement simple token filtering, you can use < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/impl/BaseTokenFilter.html#" > < code > BaseTokenFilter< / code > < / a >
as a base class, or another base class in < a href = "https://docs.pmd-code.org/apidocs/pmd-core/7.8.0-SNAPSHOT/net/sourceforge/pmd/cpd/impl/package-summary.html#" > < code > net.sourceforge.pmd.cpd.impl< / code > < / a > .
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Take a look at the < a href = "https://github.com/pmd/pmd/blob/main/pmd-kotlin/src/main/java/net/sourceforge/pmd/lang/kotlin/cpd/KotlinCpdLexer.java" > Kotlin token filter implementation< / a > , or the < a href = "https://github.com/pmd/pmd/blob/master/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/cpd/JavaCpdLexer.java" > Java one< / a > .< / p >
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< h3 id = "testing-your-implementation" > Testing your implementation< / h3 >
< p > Add a Maven dependency on < code class = "language-plaintext highlighter-rouge" > pmd-lang-test< / code > (scope < code class = "language-plaintext highlighter-rouge" > test< / code > ) in your < code class = "language-plaintext highlighter-rouge" > pom.xml< / code > .
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This contains utilities to test your CpdLexer.< / p >
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< p > Create a test class extending from < a href = "https://docs.pmd-code.org/apidocs/pmd-lang-test/7.8.0-SNAPSHOT/net/sourceforge/pmd/lang/test/cpd/CpdTextComparisonTest.html#" > < code > CpdTextComparisonTest< / code > < / a > .
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To add tests, you need to write regular JUnit < code class = "language-plaintext highlighter-rouge" > @Test< / code > -annotated methods, and
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call the method < code class = "language-plaintext highlighter-rouge" > doTest< / code > with the name of the test file.< / p >
< p > For example, for the Dart language:< / p >
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< div class = "language-java highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "kn" > package< / span > < span class = "nn" > net.sourceforge.pmd.lang.dart.cpd< / span > < span class = "o" > ;< / span >
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< span class = "kd" > public< / span > < span class = "kd" > class< / span > < span class = "nc" > DartTokenizerTest< / span > < span class = "kd" > extends< / span > < span class = "nc" > CpdTextComparisonTest< / span > < span class = "o" > {< / span >
< span class = "cm" > /**********************************
Implementation of the superclass
***********************************/< / span >
< span class = "kd" > public< / span > < span class = "nf" > DartTokenizerTest< / span > < span class = "o" > ()< / span > < span class = "o" > {< / span >
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< span class = "kd" > super< / span > < span class = "o" > (< / span > < span class = "s" > "dart"< / span > < span class = "o" > ,< / span > < span class = "s" > ".dart"< / span > < span class = "o" > );< / span > < span class = "c1" > // the ID of the language, then the file extension used by test files< / span >
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< span class = "o" > }< / span >
< span class = "nd" > @Override< / span >
< span class = "kd" > protected< / span > < span class = "nc" > String< / span > < span class = "nf" > getResourcePrefix< / span > < span class = "o" > ()< / span > < span class = "o" > {< / span >
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< span class = "c1" > // "testdata" is the default value, you don't need to override.< / span >
< span class = "c1" > // This specifies that you should place the test files in< / span >
< span class = "c1" > // src/test/resources/net/sourceforge/pmd/lang/dart/cpd/testdata< / span >
< span class = "k" > return< / span > < span class = "s" > "testdata"< / span > < span class = "o" > ;< / span >
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< span class = "o" > }< / span >
< span class = "cm" > /**************
Test methods
***************/< / span >
< span class = "nd" > @Test< / span > < span class = "c1" > // don't forget the JUnit annotation< / span >
< span class = "kd" > public< / span > < span class = "kt" > void< / span > < span class = "nf" > testLiterals< / span > < span class = "o" > ()< / span > < span class = "o" > {< / span >
< span class = "c1" > // This will look for a file named literals.dart< / span >
< span class = "c1" > // in the directory identified by getResourcePrefix,< / span >
< span class = "c1" > // tokenize it, then compare the result against a baseline< / span >
< span class = "c1" > // literals.txt file in the same directory< / span >
< span class = "c1" > // If the baseline file does not exist, it is created automatically< / span >
< span class = "n" > doTest< / span > < span class = "o" > (< / span > < span class = "s" > "literals"< / span > < span class = "o" > );< / span >
< span class = "o" > }< / span >
< span class = "o" > }< / span >
< / code > < / pre > < / div > < / div >
< div class = "tags" >
< b > Tags: < / b >
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< a href = "tag_devdocs.html" class = "btn btn-outline-secondary navbar-btn cursorNorm" role = "button" > devdocs< / a >
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< a href = "tag_extending.html" class = "btn btn-outline-secondary navbar-btn cursorNorm" role = "button" > extending< / a >
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This documentation is written in markdown. < br / >
If there is something missing or can be improved, edit this page on
github and create a PR:
< a
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© 2024 PMD Open Source Project. All rights
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reserved. < br / >
< span > Page last updated:< / span >
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June 2024 (7.3.0)< br / > Site last generated: Nov 21, 2024 < br / >
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