import org.codehaus.groovy.ast.CodeVisitorSupport; //导入依赖的package包/类
private static void visit(Closure closure, CodeVisitorSupport visitor) {
    if (closure != null) {
        ClassNode classNode = closure.getMetaClass().getClassNode();
        if (classNode == null) {
            throw new GroovyRuntimeException(
                    "DataSet unable to evaluate expression. AST not available for closure: " + closure.getMetaClass().getTheClass().getName() +
                            ". Is the source code on the classpath?");
        }
        List methods = classNode.getDeclaredMethods("doCall");
        if (!methods.isEmpty()) {
            MethodNode method = (MethodNode) methods.get(0);
            if (method != null) {
                Statement statement = method.getCode();
                if (statement != null) {
                    statement.visit(visitor);
                }
            }
        }
    }
}
 

import org.codehaus.groovy.ast.CodeVisitorSupport; //导入依赖的package包/类
private static void correctAccessedVariable(final InnerClassNode closureClass, ClosureExpression ce) {
    CodeVisitorSupport visitor = new CodeVisitorSupport() {
        @Override
        public void visitVariableExpression(VariableExpression expression) {
            Variable v = expression.getAccessedVariable(); 
            if (v==null) return;
            if (!(v instanceof FieldNode)) return;
            String name = expression.getName();
            FieldNode fn = closureClass.getDeclaredField(name);
            if (fn != null) { // only overwrite if we find something more specific
                expression.setAccessedVariable(fn);
            }
        }  
    };
    visitor.visitClosureExpression(ce);
}
 

import org.codehaus.groovy.ast.CodeVisitorSupport; //导入依赖的package包/类
private String getUniqueVariableName(final String name, Statement code) {
    if (code == null) return name;
    final Object[] found = new Object[1];
    CodeVisitorSupport cv = new CodeVisitorSupport() {
        public void visitVariableExpression(VariableExpression expression) {
            if (expression.getName().equals(name)) found[0] = Boolean.TRUE;
        }
    };
    code.visit(cv);
    if (found[0] != null) return getUniqueVariableName("_" + name, code);
    return name;
}
 

import org.codehaus.groovy.ast.CodeVisitorSupport; //导入依赖的package包/类
private static void checkReturnInObjectInitializer(List<Statement> init) {
    CodeVisitorSupport cvs = new CodeVisitorSupport() {
        @Override
        public void visitClosureExpression(ClosureExpression expression) {
            // return is OK in closures in object initializers
        }

        public void visitReturnStatement(ReturnStatement statement) {
            throw new RuntimeParserException("'return' is not allowed in object initializer", statement);
        }
    };
    for (Statement stm : init) {
        stm.visit(cvs);
    }
}