[ecmascript] PMD CPD error parsing files with shebang · Issue #4580 · pmd/pmd

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Affects PMD Version: 7.0.0-rc2

Description:

PMD CPD throws an error when parsing ECMAScript files that start with a shebang. This is required for executable Node.js scripts (declared in the bin property of package.json , and detailed in this ESLint rule ).

As noted on the MDN page on JavaScript lexical grammar , the hashbang style comment is valid ECMAScript syntax, and should be treated as any other comment. This behavior is consistent in testing on Chrome, Edge, and Firefox on Windows.

Exception Stacktrace:

The following error is thrown:

# pmd cpd --dir . --minimum-tokens 15 --language ecmascript --debug
[main] INFO net.sourceforge.pmd.cli.commands.internal.AbstractPmdSubcommand - Log level is at TRACE
[main] DEBUG net.sourceforge.pmd.cpd.CPD - Searching directory . for files
[main] DEBUG net.sourceforge.pmd.cpd.CPD - Tokenizing /app/./bin/cli.js
net.sourceforge.pmd.lang.ast.TokenMgrError: Lexical error in file '/app/./bin/cli.js' at line 1, column 1: "#" (35), after : "" (in lexical state DEFAULT)
        at net.sourceforge.pmd.lang.ecmascript5.ast.Ecmascript5ParserImplTokenManager.getNextToken(Ecmascript5ParserImplTokenManager.java:5585)
        at net.sourceforge.pmd.lang.ecmascript5.ast.Ecmascript5ParserImplTokenManager.getNextToken(Ecmascript5ParserImplTokenManager.java:7)
        at net.sourceforge.pmd.cpd.token.internal.BaseTokenFilter.getNextToken(BaseTokenFilter.java:45)
        at net.sourceforge.pmd.cpd.impl.JavaCCTokenizer.tokenize(JavaCCTokenizer.java:53)
        at net.sourceforge.pmd.cpd.CPD.addAndThrowLexicalError(CPD.java:230)
        at net.sourceforge.pmd.cpd.CPD.add(CPD.java:224)
        at net.sourceforge.pmd.cpd.CPD.add(CPD.java:193)
        at net.sourceforge.pmd.cpd.CPD.add(CPD.java:155)
        at net.sourceforge.pmd.cpd.CPD.addDirectory(CPD.java:166)
        at net.sourceforge.pmd.cpd.CPD.addRecursively(CPD.java:150)
        at net.sourceforge.pmd.cpd.CPD.addSourcesFilesToCPD(CPD.java:87)
        at net.sourceforge.pmd.cpd.CPD.extractAllSources(CPD.java:65)
        at net.sourceforge.pmd.cpd.CPD.<init>(CPD.java:59)
        at net.sourceforge.pmd.cli.commands.internal.CpdCommand.execute(CpdCommand.java:135)
        at net.sourceforge.pmd.cli.commands.internal.AbstractPmdSubcommand.call(AbstractPmdSubcommand.java:35)
        at net.sourceforge.pmd.cli.commands.internal.AbstractPmdSubcommand.call(AbstractPmdSubcommand.java:20)
        at picocli.CommandLine.executeUserObject(CommandLine.java:2041)
        at picocli.CommandLine.access$1500(CommandLine.java:148)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
        at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
        at picocli.CommandLine.execute(CommandLine.java:2170)
        at net.sourceforge.pmd.cli.PmdCli.main(PmdCli.java:18)
Code Sample demonstrating the issue:
#!/usr/bin/env node
console.log('this is a test');
Steps to reproduce:
Please provide detailed steps for how we can reproduce the bug.
Run pmd cpd --dir . --minimum-tokens 15 --language ecmascript --debug with the above code sample in a file in the current working directory.
Running PMD through: CLI
          Digging a little further:
Hashbang comments were officially added to ECMAScript in the 2023 specification (the original proposal)
This is a duplicate of [javascript] Support files containing a shebang with CPD #1756
          @aarongoldenthal , many thanks for the research!
I'll keep then the original issue and close this one as duplicate.
Duplicate of #1756