我想遍历 ast 然后输出方法、变量、用户定义类型等。有人可以给我一些示例代码或建议吗？顺便说一句，我只想在遍历叶子节点（没有子节点）时输出，我该怎么办？这是我的代码，希望得到一些建议~^-^
public class test1 {
/**
* @param args
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
IParserLogService log = new DefaultLogService();
String code = FileToString.readFile("C:/Users/badboy/Desktop/程序/A.cpp");
System.out.println(code);
CodeReader reader = new CodeReader(code.toCharArray());
Map definedSymbols = new HashMap();
String[] includePaths = new String[0];
IScannerInfo info = new ScannerInfo(definedSymbols, includePaths);
ICodeReaderFactory readerFactory = FileCodeReaderFactory.getInstance();
IASTTranslationUnit translationUnit = GPPLanguage.getDefault()
.getASTTranslationUnit(reader, info, readerFactory, null, log);
ASTVisitor visitor = new ASTVisitor() {
public int visit(IASTName name) {
String prtName = name.toString();
if (prtName.length() == 0)
prtName = name.getRawSignature(); // use pre pre-processor
// value
System.out.println("Visiting name: " + prtName);
return PROCESS_CONTINUE;
}
public int visit(IASTStatement stmt) { // lots more
String sig = stmt.getRawSignature();
if (sig.length() > 0)
System.out.println("Visiting stmt: "
+ stmt.getRawSignature());
else if (stmt instanceof IASTCompoundStatement) {
IASTCompoundStatement cstmt = (IASTCompoundStatement) stmt;
IASTStatement[] stmts = cstmt.getStatements();
System.out.println("Visiting compound stmt with stmts: "
+ stmts.length);
for (IASTStatement st : stmts) {
String rawSig = st.getRawSignature();
if (rawSig.length() == 0) {
System.out.println(" ->" + st);
if (st instanceof CASTExpressionStatement) {
CASTExpressionStatement es = (CASTExpressionStatement) st;
IASTExpression exp = es.getExpression();
if (exp instanceof IASTBinaryExpression) {
IASTBinaryExpression bexp = (IASTBinaryExpression) exp;
System.out.println(" binary exp: "
+ bexp.getOperand1() + " "
+ bexp.getOperator() + " "
+ bexp.getOperand2());
}
String expStr = exp.getRawSignature();
IType type = exp.getExpressionType();
}
} else {
System.out.println(" ->" + rawSig);
}
}
}
return PROCESS_CONTINUE;
}
public int visit(IASTDeclaration decl) {
System.out.println("Visiting decl: " + decl.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTComment comm) {
System.out.println("Visiting comm: " + comm.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTDeclarator dtor) {
System.out.println("Visiting dtor: " + dtor.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTDeclSpecifier dspe) {
System.out.println("Visiting dspe: " + dspe.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTEnumerator enmt) {
System.out.println("Visiting enmt: " + enmt.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTExpression expr) {
System.out.println("Visiting expr: " + expr.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTInitializer init) {
System.out.println("Visiting init: " + init.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTParameterDeclaration para) {
System.out.println("Visiting para: " + para.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTProblem prob) {
System.out.println("Visiting prob: " + prob.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTTranslationUnit tran) {
System.out.println("Visiting tran: " + tran.getRawSignature());
return PROCESS_CONTINUE;
}
public int visit(IASTTypeId type) {
System.out.println("Visiting type: " + type.getRawSignature());
return PROCESS_CONTINUE;
}
/* public int leave(IASTName name) {
System.out.println("Leaving name " + name.getRawSignature());
return ASTVisitor.PROCESS_CONTINUE;
}
public int leave(IASTStatement stmt) {
System.out.println(" Leaving stmt: " + stmt.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTDeclaration decl) {
System.out.println("Leaving decl: " + decl.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTComment comm) {
System.out.println("Leaving comm: " + comm.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTDeclarator dtor) {
System.out.println("Leaving dtor: " + dtor.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTDeclSpecifier dspe) {
System.out.println("Leaving dspe: " + dspe.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTEnumerator enmt) {
System.out.println("Leaving enmt: " + enmt.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTExpression expr) {
System.out.println("Leaving expr: " + expr.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTInitializer init) {
System.out.println("Leaving init: " + init.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTParameterDeclaration para) {
System.out.println("Leaving para: " + para.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTProblem prob) {
System.out.println("Leaving prob: " + prob.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTTranslationUnit tran) {
System.out.println("Leaving tran: " + tran.getRawSignature());
return PROCESS_CONTINUE;
}
public int leave(IASTTypeId type) {
System.out.println("Leaving type: " + type.getRawSignature());
return PROCESS_CONTINUE;
}*/
};
visitor.shouldVisitNames = true;
visitor.shouldVisitDeclarations = true;
visitor.shouldVisitStatements = true;
visitor.shouldVisitComments = true;
visitor.shouldVisitDeclarators = true;
visitor.shouldVisitDeclSpecifiers = true;
visitor.shouldVisitEnumerators = true;
visitor.shouldVisitExpressions = true;
visitor.shouldVisitInitializers = true;
visitor.shouldVisitParameterDeclarations = true;
visitor.shouldVisitProblems = true;
visitor.shouldVisitTranslationUnit = true;
visitor.shouldVisitTypeIds = true;
translationUnit.accept(visitor);
}
}