从字符串中删除注释 [英] Removing the comments from a string

问题描述

我想做一个获取字符串的函数，如果它有内联注释，它会删除它。

I'd like to do a function which gets a string and in case it has inline comments it removes it.

public class sample {

    public static void main(String[] args) {
        String code = "/**THIS IS SAMPLE CODE */ public class TestFormatter{public static void main(String[] args){int i =2; String s= \"name\";\\u give give change the values System.out.println(\"Hello World\");//sample}}";

        CodeFormatter codeFormatter = ToolFactory.createCodeFormatter(null);

        TextEdit textEdit = codeFormatter.format(
                CodeFormatter.K_COMPILATION_UNIT, code1, 0, code1.length(), 0,
                null);
        IDocument doc = new Document(code1);
        try {
            textEdit.apply(doc);
            System.out.println(doc.get());
        } catch (MalformedTreeException e) {
            e.printStackTrace();
        } catch (BadLocationException e) {
            e.printStackTrace();
        }
    }
}

我得到空指针异常在 textEdit.apply（doc）。这是因为它不接受评论。

I am getting null pointer exception at textEdit.apply(doc). This is because it is not accepting the comments.

你能告诉我从字符串中删除评论的最佳方法是什么？ （请不要建议太高级的解决方案。）

Can you tell me what's the best way to remove the comments from the string? (please don't advice too advanced solutions).

推荐答案

尝试

replaceAll("(?s)/\\*.*?\\*/", "")

示例：

String code = "/**THIS IS SAMPLE CODE */ public class TestFormatter{public static void main(String[] args){int i =2; String s= \"name\";\\\\u give give change the values System.out.println(\"Hello World\");//sample}}";
System.out.println(code.replaceAll("(?s)/\\*.*?\\*/", ""));

输出：

public class TestFormatter{public static void main(String[] args){int i =2; String s= "name";\\u give give change the values System.out.println("Hello World");//sample}}

---

PS。

如果你还想删除最后的评论 // sample}}

if you also want to remove last comments //sample}}

然后使用 split（）

System.out.println(code.replaceAll("(?s)/\\*.*?\\*/", "").split("//")[0]);
// keep in Mind it will also Remove  }} from //sample}} 

输出：

 public class TestFormatter{public static void main(String[] args){int i =2; String s= "name";\u give give change the values System.out.println("Hello World");

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