Eclipse中的CDT解析C++/C的简单使用

最近在做实验室里的一个项目，需要用到CDT解析C++/C语言文件，网上这类方法太少，在此记录一下使用到的一些与CDT有关的函数与流程。

package com.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import org.eclipse.cdt.core.dom.ast.IASTComment;
import org.eclipse.cdt.core.dom.ast.IASTDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
import org.eclipse.cdt.core.dom.ast.IASTFunctionDefinition;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorStatement;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.gnu.c.GCCLanguage;
import org.eclipse.cdt.core.dom.ast.gnu.cpp.GPPLanguage;
import org.eclipse.cdt.core.model.ILanguage;
import org.eclipse.cdt.core.parser.DefaultLogService;
import org.eclipse.cdt.core.parser.FileContent;
import org.eclipse.cdt.core.parser.IncludeFileContentProvider;
import org.eclipse.cdt.core.parser.ScannerInfo;




public class CDTTest {

    public static void main(String[] args) throws Exception {
        IASTTranslationUnit u = getTranslationUnit(new File("G:\\temp\\minpath.cpp"));
        //输出的是文件的所有内容
        System.out.println("simpleDeclaration.getRawSignature():"+u.getRawSignature());

        
        /**
         * 获取注释
         */
        IASTComment[]  com = u.getComments();
        for (IASTComment iastComment : com) {
			System.out.println("IASTComment:"+iastComment);
		}
               
      
        
        /**
         * 得到预处理语句
         * #include 
		 * #define maxnum 120   这一类
         */
        IASTPreprocessorStatement[] ps = u.getAllPreprocessorStatements();
        for (IASTPreprocessorStatement iastPreprocessorStatement : ps) {
			System.out.println(iastPreprocessorStatement.getRawSignature());
		}

		
        //得到文件中定义的声明
        IASTDeclaration[] decs = u.getDeclarations();
        for ( IASTDeclaration child : decs)
		{
        	//方法声明
			if (child instanceof IASTFunctionDefinition)
			{
				
				
				//获得函数说明符,例void
				System.out.println(((IASTFunctionDefinition)child).getDeclSpecifier().getRawSignature());
				//获得函数的函数声明符 ,例Dijkstra(ALGraph g, int v0, int n)
				System.out.println(((IASTFunctionDefinition)child).getDeclarator().getRawSignature());
				//获得函数体的内容 {}之间的内容
				System.out.println(((IASTFunctionDefinition)child).getBody().getRawSignature());
				
				//输出函数的全部内容
				System.out.println(child.getRawSignature());
				
				//与函数的起始位置有关
				IASTFileLocation  FileLocation = ((IASTFunctionDefinition)child).getFileLocation();
				int startLine = FileLocation.getStartingLineNumber();
				int endLine = FileLocation.getEndingLineNumber();
				System.out.println("length:"+ (endLine-startLine));
			}
		}    
	        
    }

    /**
     * 创建解析单元
     * @param source
     * @return
     * @throws Exception
     */
    static IASTTranslationUnit getTranslationUnit(File source) throws Exception{
        FileContent reader = FileContent.create(
                source.getAbsolutePath(), 
                getContentFile(source).toCharArray());

    	
        //C++用GPPLanguage解析，C用GCCLanguage解析
        return GPPLanguage.getDefault().getASTTranslationUnit(
                reader, 
                new ScannerInfo(), 
                IncludeFileContentProvider.getSavedFilesProvider(), 
                null, 
                ILanguage.OPTION_IS_SOURCE_UNIT, 
                new DefaultLogService());
               
        
//        return GCCLanguage.getDefault().getASTTranslationUnit(
//                reader, 
//                new ScannerInfo(), 
//                IncludeFileContentProvider.getSavedFilesProvider(), 
//                null, 
//                ILanguage.OPTION_IS_SOURCE_UNIT, 
//                new DefaultLogService());
    }

    /**
     * 获得文件中的内容
     * @param file
     * @return
     * @throws IOException
     */
    static String getContentFile(File file) throws IOException {
        StringBuilder content = new StringBuilder();
        String line;

        try (BufferedReader br = new BufferedReader(
                new InputStreamReader(new FileInputStream(file)))) {
            while ((line = br.readLine()) != null)
                content.append(line).append('\n');
        }

        return content.toString();
    }
}

部分参考资料
[1]: https://blog.csdn.net/luanfengxia/article/details/4619350
[2]: https://help.eclipse.org/2019-06/index.jsp