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https://issues.apache.org/jira/browse/GROOVY-7928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15465759#comment-15465759
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Juan Martín Sotuyo Dodero commented on GROOVY-7928:
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I've been tinkering with this a little bit, here are my findings:
{{"$var"}} -> fails with same error
{{"\$5"}} -> fails with same error
{{"$\{var\}"}} -> fails with same error
{{"$"}} -> fails with {{'illegal string body character after dollar sign;
solution: either escape a literal dollar sign "\$5" or bracket the value
expression "$\{5\}"'}} (this is actually correct!)
Uner no circunstances however, I get a GString containing a dollar sign to
actually parse without error.
> Groovy antlr syntax does not parse GStrings with variables
> ----------------------------------------------------------
>
> Key: GROOVY-7928
> URL: https://issues.apache.org/jira/browse/GROOVY-7928
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.7
> Reporter: Juan Martín Sotuyo Dodero
>
> I'm trying to add Groovy support to PMD's CPD (copy paste detector, see
> https://pmd.github.io/pmd-5.5.1/usage/cpd-usage.html). To do so, I'm
> attempting to use the GroovyLexer shipped in
> org.codehaus.groovy:groovy:2.4.7, which is generated from the groovy.g ANTLR
> syntax file.
> My code currently is:
> {code:java}
> GroovyLexer lexer = new
> GroovyLexer(IOUtils.toInputStream(buffer.toString()));
>
> try {
> Token token = lexer.nextToken();
> while (token.getType() != Token.EOF_TYPE) {
> // Redacted for simplicity...
> token = lexer.nextToken();
> }
> } catch (TokenStreamException err) {
> // Wrap exceptions of the Groovy tokenizer in a TokenMgrError, so
> they are correctly handled
> // when CPD is executed with the '--skipLexicalErrors' command
> line option
> throw new TokenMgrError(
> "Lexical error at line " + lexer.getLine() + ", column "
> + lexer.getColumn() + ". " + err.getMessage(),
> TokenMgrError.LEXICAL_ERROR);
> }
> {code}
> When parsing this simple snippet:
> {code:java}
> class BTree<K, V> extends BTreeNode<K> {
> def add(K key, V value) {
> throw new Exception("$key")
> }
> }
> {code}
> I get:
> {quote}
> Lexical error at line 5, column 34. expecting anything but ''\n''; got it
> anyway
> {quote}
> Changing *$key* for any constant string works just fine, the problem is with
> GStrings actually interpolating variables.
> Thanks in advance
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