2014-06-15 15 views
2

在我的Eclipse插件中,我想分析CompilationUnit中的註釋。我的其他訪問者(例如ForVisitor,VariableDeclarationVisitor等)工作得很好 - 但我的CommentVisitor不返回任何內容。ASTVisitor在Eclipse插件中不返回任何評論

AST和創造的ASTVisitor(適用於所有其他遊客)

void createAST(ICompilationUnit unit) throws JavaModelException { 
    CompilationUnit parse = parse(unit); 

    // return all comments 
    CommentVisitor visitor = new CommentVisitor(); 
    parse.accept(visitor); 
    System.out.println(parse.getCommentList().toString()); 
    for(LineComment lineComment : visitor.getLineComments()) { 
     lineComment.accept(visitor); // a try to make it work 
     System.out.println("Line Comment: " + lineComment.getLength()); 
    } 
    System.out.println("---------------------------------"); 
    for(BlockComment blockComment : visitor.getBlockComments()) { 
     System.out.println("Block Comment: " + blockComment.getLength()); 
    } 
} 

CompilationUnit parse(ICompilationUnit unit) { 
    ASTParser parser = ASTParser.newParser(AST.JLS4); 
    parser.setKind(ASTParser.K_COMPILATION_UNIT); 
    parser.setSource(unit); 
    parser.setResolveBindings(true); 
    return (CompilationUnit) parser.createAST(null); // parse 
} 

CommentVisitor.java(大致相同的語法,因爲所有其他訪問者)

import java.util.ArrayList; 
import java.util.List; 

import org.eclipse.jdt.core.dom.ASTVisitor; 
import org.eclipse.jdt.core.dom.BlockComment; 
import org.eclipse.jdt.core.dom.LineComment; 

public class CommentVisitor extends ASTVisitor { 
    List<LineComment> lineComments = new ArrayList<LineComment>(); 
    List<BlockComment> blockComments = new ArrayList<BlockComment>(); 

    @Override 
    public boolean visit(LineComment node) { 
      lineComments.add(node); 
      return super.visit(node); 
    } 

    @Override 
    public boolean visit(BlockComment node) { 
      blockComments.add(node); 
      return super.visit(node); 
    } 

    public List<LineComment> getLineComments() { 
      return lineComments; 
    } 

    public List<BlockComment> getBlockComments() { 
      return blockComments; 
    } 
} 

爲了澄清我問題再次出現:我沒有從上面的代碼中得到任何反應 - 甚至沒有空字符串,這是這裏關於SO的其他幾個問題的主題。

回答

0

請參考此page找到答案。

public boolean visit(LineComment node) { 
     int start = node.getStartPosition(); 
     int end = start + node.getLength(); 
     // source is a string representing your source code 
     String comment = source.substring(start, end); 
     System.out.println(comment); 
     return true; 
    } 
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