Showing content from https://github.com/pmd/pmd/issues/4120 below:
[core] Explicitly name all language versions · Issue #4120 · pmd/pmd · GitHub
Is your feature request related to a problem? Please describe.
Some languages have a single language version with the empty string as a name. This is not a problem today but #4059 aims to make --use-version more useful by allowing to explicitly state a version to use for all languages. The goal of this is to have a failsafe in case the version is changed or removed, and to document versions better. This is not possible if versions have empty names.
Describe the solution you'd like
Give an explicit name for all language versions.
Describe alternatives you've considered
#4048 was an alternative to this but doesn't help with the --use-version use case described above, indeed making it worse.
Additional context
See full thread in #4059 (comment)
PMD Language and version mappings Language Id=Terse Name (Name) Extensions Rules Version(s) in PMD 6 (*default) Proposed Version(s) in PMD 7 apex (Apex) cls, trigger ✔️ 54* 52, 53, 54, 55, 56, 57* ecmascript (Ecmascript) js ✔️ 3* 3, 5, 6 (alias: ES6, ES2015), 7 (ES2016), 8 (ES2017), 9* (ES2018) html (HTML) html, htm, xhtml, xht, shtml ✔️ ""* 4, 5* java (Java) java ✔️ 1.3, 1.4, 1.5, 5, 1.6, 6, 1.7, 7, 1.8, 8, 9, 1.9, 10, 1.10, 11, 12, 13, 14, 15, 16, 17, 18, 18-preview, 19*, 19-preview same jsp (Java Server Pages) jsp, jspx, jspf, tag ✔️ ""* 2, *3 kotlin (Kotlin) kt, ktm ✔️ n/a - only PMD 7 1.6, 1.7* modelica (Modelica) mo ✔️ ""* 3.4, 3.5* plsql (PLSQL) sql, trg, prc, fnc, pld, pls, plh, plb, pck, pks, pkh, pkb, typ, tyb, tps, tpb ✔️ ""* 11g, 12c Release 1 (alias: 12.1), 12c Release 2 (alias 12.2), 18c, 19c, 21c* text (Plain text) plain-text-file-goo-extension ❌ default* ❓ pom (Maven POM) pom ✔️ ""* 4.0.0* scala (Scala) scala ❌ 2.13*, 2.12, 2.11, 2.10 same swift (Swift) swift (:x:) :heavy_check_mark: n/a (only CPD) 4.2, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7* vf (Salesforce VisualForce) page, component ✔️ ""* 52, 53, 54, 55, 56, 57* vm (VM) (=Velocity Template Language) vm ✔️ ""* 2.0, 2.1, 2.2, 2.3* wsdl (WSDL) wsdl ❌ ""* 1.1, 2.0* xml (XML) xml ✔️ ""* 1.0, 1.1* xsl (XSL) xsl, xslt ✔️ ""* 1.0, 2.0, 3.0* PMD Languages that only support CPD
all except "go" are deprecated on PMD 6, as they don't support PMD
They will be/have been deleted in PMD 7
Language Id=Terse Name (Name) Extensions cpp (C++) h, c, cpp, cxx, cc, C cs (C#) cs fortran (Fortran) for, f, f66, f77, f90 go (Golang) go groovy (Groovy) groovy matlab (Matlab) m objectivec (Objective-C) h, m php (PHP: Hypertext Preprocessor) php, class python (Python) py ruby (Ruby) rb, cgi, class swift (Swift) swift CPD Languages Language Id=Terse Name (Name) Extensions any (Any Language) n/a apex (Apex) .cls cpp (C++) .h, .hpp, .hxx, .c, .cpp, .cxx, .cc, .C cs (C#) .cs dart (Dart) .dart ecmascript (JavaScript) .js fortran (Fortran) .for, .f, .f66, .f77, .f90 gherkin (Gherkin) .feature go (Go) .go groovy (Groovy) .groovy html (HTML) .html jsp (JSP) .jsp, .jspx, .jspf, .tag java (Java) .java kotlin (Kotlin) .kt lua (Lua) .lua matlab (Matlab) .m modelica (Modelica) .mo objectivec (Objective-C) .h, .m php (PHP) .php, .class plsql (PL/SQL) .sql, .trg, .prc, .fnc, .pld, .pls, .plh, .plb, .pck, .pks, .pkh, .pkb, .typ, .tyb, .tps, .tpb perl (Perl) .pm, .pl, .t python (Python) .py ruby (Ruby) .rb, .cgi, .class scala (Scala) .scala swift (Swift) .swift vf (VisualForce) .page, .component xml (XML) .xml
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