Java GroovyShell不解析GString中占位符的花括号

我一直在处理Groovy应用程序的AST分析和检测，我注意到在编译的

解析
阶段之后，GString占位符中的花括号被完全忽略了

比如说,

log.debug "Found ${recentEvents?.size() ?: 0} events in the last $deltaSeconds seconds"

变成

log.debug("Found $(recentEvents?.size()) ? recentEvents?.size() : 0 events in the last $deltaSeconds seconds")

因此，占位符中的语句会与字符串的其他部分混淆，并在检测后编译时导致错误

GroovyShell
类的设置如下：

STAnalysisAST stal = new STAnalysisAST()
CompilerConfiguration cc = new CompilerConfiguration(CompilerConfiguration.DEFAULT)
cc.addCompilationCustomizers(stal) 
GroovyShell gshell = new GroovyShell(cc)

这是
STAnalysisAST
课程的摘录：

@GroovyASTTransformation(phase = CompilePhase.SEMANTIC_ANALYSIS)
public class STAnalysisAST extends CompilationCustomizer{

    public STAnalysisAST(Logger logger){
        super(CompilePhase.SEMANTIC_ANALYSIS)
        nodes = new ArrayList<ICFGNode>()
    }

    @Override
    void call(SourceUnit source, GeneratorContext context, ClassNode classNode) {
        def _code = Helper.getSourceFromNode(classNode)
    }
}

AstNodeToScriptVisitor
类随Groovy 2.4.6提供

请帮助一个兄弟

class Helper {
    public static String getSourceFromNode(ClassNode classNode){
        java.io.StringWriter writer = new java.io.StringWriter();
        AstNodeToScriptVisitor visitor = new AstNodeToScriptVisitor(writer);
        visitor.visitClass(classNode);
        return writer.toString();
    }
}