我有一个java项目,我在项目中的各种java文件中的许多位置使用了注释。现在我需要删除所有类型的注释:单行,多行注释。 请提供自动删除评论。使用工具或在日食等。
目前我手动尝试删除所有公告
答案 0 :(得分:4)
您可以通过在项目/文件中搜索以下正则表达式并使用{{替换//
来删除所有单行或多行块注释(但不能删除行注释$1
) 1}}:
^([^"\r\n]*?(?:(?<=')"[^"\r\n]*?|(?<!')"[^"\r\n]*?"[^"\r\n]*?)*?)(?<!/)/\*[^\*]*(?:\*+[^/][^\*]*)*?\*+/
您可能不得不多次执行它。
这个正则表达式避免了以下陷阱:
两条评论之间的代码/* Comment 1 */ foo(); /* Comment 2 */
以星号开头的评论://***NOTE***
在字符串文字中注释分隔符:stringbuilder.append("/*");
;如果在评论
要删除所有单行注释,请在项目/文件中搜索以下正则表达式并替换为$1
:
^([^"\r\n]*?(?:(?<=')"[^"\r\n]*?|(?<!')"[^"\r\n]*?"[^"\r\n]*?)*?)\s*//[^\r\n]*
此正则表达式还避免使用双引号内的注释分隔符,但不会检查多行注释,因此会错误地删除/* // */
。
答案 1 :(得分:3)
public static String removeComments(String code) {
StringBuilder newCode = new StringBuilder();
try (StringReader sr = new StringReader(code)) {
boolean inBlockComment = false;
boolean inLineComment = false;
boolean out = true;
int prev = sr.read();
int cur;
for(cur = sr.read(); cur != -1; cur = sr.read()) {
if(inBlockComment) {
if (prev == '*' && cur == '/') {
inBlockComment = false;
out = false;
}
} else if (inLineComment) {
if (cur == '\r') { // start untested block
sr.mark(1);
int next = sr.read();
if (next != '\n') {
sr.reset();
}
inLineComment = false;
out = false; // end untested block
} else if (cur == '\n') {
inLineComment = false;
out = false;
}
} else {
if (prev == '/' && cur == '*') {
sr.mark(1); // start untested block
int next = sr.read();
if (next != '*') {
inBlockComment = true; // tested line (without rest of block)
}
sr.reset(); // end untested block
} else if (prev == '/' && cur == '/') {
inLineComment = true;
} else if (out){
newCode.append((char)prev);
} else {
out = true;
}
}
prev = cur;
}
if (prev != -1 && out && !inLineComment) {
newCode.append((char)prev);
}
} catch (IOException e) {
e.printStackTrace();
}
return newCode.toString();
}
答案 2 :(得分:2)
您可以使用java-comment-preprocessor尝试:
java -jar ./jcp-6.0.0.jar --i:/sourceFolder --o:/resultFolder -ef:none --r
答案 3 :(得分:1)
除非您对评论的撰写有更多了解,否则处理源代码很难。 在更一般的情况下,您可以在文本常量中使用//或/ *。所以你的真的需要在语法层面解析文件,而不仅仅是词汇。恕我直言,唯一的防弹解决方案就是从openjdk开始使用java解析器。
如果你知道你的评论从未与代码混在一起(在我的例句中必须是完整的行),python脚本可以提供帮助
multiple = False
for line in text:
stripped = line.strip()
if multiple:
if stripped.endswith('*/'):
multiple = False
continue
elif stripped.startswith('/*'):
multiple = True
elif stripped.startswith('//'):
pass
else:
print(line)
答案 4 :(得分:1)
这是一篇旧帖子,但这可能有助于喜欢像我一样在命令行上工作的人:
下面的perl
单行将删除所有评论:
perl -0pe 's|//.*?\n|\n|g; s#/\*(.|\n)*?\*/##g;' test.java
示例:
cat test.java
this is a test
/**
*This should be removed
*This should be removed
*/
this should not be removed
//this should be removed
this should not be removed
this should not be removed //this should be removed
输出:
perl -0pe 's#/\*\*(.|\n)*?\*/##g; s|//.*?\n|\n|g' test.java
this is a test
this should not be removed
this should not be removed
this should not be removed
如果你想摆脱多个空白行:
perl -0pe 's|//.*?\n|\n|g; s#/\*(.|\n)*?\*/##g; s/\n\n+/\n\n/g' test.java
this is a test
this should not be removed
this should not be removed
this should not be removed
编辑:更正了正则表达式
答案 5 :(得分:1)
如果您使用的是Eclipse IDE,那么可以让正则表达式为您完成工作。
打开搜索窗口(Ctrl + F),然后选中“正则表达式”。
将表达式提供为
/\*\*(?s:(?!\*/).)*\*/
Prasanth Bhate在Tool to remove JavaDoc comments?
中对此进行了解释答案 6 :(得分:1)
我创建了一个开源library并上传到github,它名为CommentRemover,你可以删除单行和多行Java注释。
它支持删除或不删除TODO&#39; s 它也支持JavaScript,HTML,CSS,属性,JSP和XML注释。
有一些代码片段如何使用它(有2种类型用法):
第一种方式是InternalPath
public static void main(String[] args) throws CommentRemoverException {
// root dir is: /Users/user/Projects/MyProject
// example for startInternalPath
CommentRemover commentRemover = new CommentRemover.CommentRemoverBuilder()
.removeJava(true) // Remove Java file Comments....
.removeJavaScript(true) // Remove JavaScript file Comments....
.removeJSP(true) // etc.. goes like that
.removeTodos(false) // Do Not Touch Todos (leave them alone)
.removeSingleLines(true) // Remove single line type comments
.removeMultiLines(true) // Remove multiple type comments
.startInternalPath("src.main.app") // Starts from {rootDir}/src/main/app , leave it empty string when you want to start from root dir
.setExcludePackages(new String[]{"src.main.java.app.pattern"}) // Refers to {rootDir}/src/main/java/app/pattern and skips this directory
.build();
CommentProcessor commentProcessor = new CommentProcessor(commentRemover);
commentProcessor.start();
}
第二种方式ExternalPath
public static void main(String[] args) throws CommentRemoverException {
// example for externalInternalPath
CommentRemover commentRemover = new CommentRemover.CommentRemoverBuilder()
.removeJava(true) // Remove Java file Comments....
.removeJavaScript(true) // Remove JavaScript file Comments....
.removeJSP(true) // etc..
.removeTodos(true) // Remove todos
.removeSingleLines(false) // Do not remove single line type comments
.removeMultiLines(true) // Remove multiple type comments
.startExternalPath("/Users/user/Projects/MyOtherProject")// Give it full path for external directories
.setExcludePackages(new String[]{"src.main.java.model"}) // Refers to /Users/user/Projects/MyOtherProject/src/main/java/model and skips this directory.
.build();
CommentProcessor commentProcessor = new CommentProcessor(commentRemover);
commentProcessor.start();
}
答案 7 :(得分:0)
这就是我昨天想出来的。 这实际上是我从学校得到的作业,所以如果有人在我把它转入之前读到并发现了一个错误,请发表评论=)
PS。 &#39; FilterState&#39;是一个枚举类
public static String deleteComments(String javaCode) {
FilterState state = FilterState.IN_CODE;
StringBuilder strB = new StringBuilder();
char prevC=' ';
for(int i = 0; i<javaCode.length(); i++){
char c = javaCode.charAt(i);
switch(state){
case IN_CODE:
if(c=='/')
state = FilterState.CAN_BE_COMMENT_START;
else {
if (c == '"')
state = FilterState.INSIDE_STRING;
strB.append(c);
}
break;
case CAN_BE_COMMENT_START:
if(c=='*'){
state = FilterState.IN_COMMENT_BLOCK;
}
else if(c=='/'){
state = FilterState.ON_COMMENT_LINE;
}
else {
state = FilterState.IN_CODE;
strB.append(prevC+c);
}
break;
case ON_COMMENT_LINE:
if(c=='\n' || c=='\r') {
state = FilterState.IN_CODE;
strB.append(c);
}
break;
case IN_COMMENT_BLOCK:
if(c=='*')
state=FilterState.CAN_BE_COMMENT_END;
break;
case CAN_BE_COMMENT_END:
if(c=='/')
state = FilterState.IN_CODE;
else if(c!='*')
state = FilterState.IN_COMMENT_BLOCK;
break;
case INSIDE_STRING:
if(c == '"' && prevC!='\\')
state = FilterState.IN_CODE;
strB.append(c);
break;
default:
System.out.println("unknown case");
return null;
}
prevC = c;
}
return strB.toString();
}
答案 8 :(得分:0)
公共类TestForStrings {
/**
* The main method.
*
* @param args
* the arguments
* @throws Exception
* the exception
*/
public static void main(String args[]) throws Exception {
String[] imports = new String[100];
String fileName = "Menu.java";
// This will reference one API at a time
String line = null;
try {
FileReader fileReader = new FileReader(fileName);
// Always wrap FileReader in BufferedReader.
BufferedReader bufferedReader = new BufferedReader(fileReader);
int startingOffset = 0;
// This will reference one API at a time
List<String> lines = Files.readAllLines(Paths.get(fileName),
Charset.forName("ISO-8859-1"));
// remove single line comments
for (int count = 0; count < lines.size(); count++) {
String tempString = lines.get(count);
lines.set(count, removeSingleLineComment(tempString));
}
// remove multiple lines comment
for (int count = 0; count < lines.size(); count++) {
String tempString = lines.get(count);
removeMultipleLineComment(tempString, count, lines);
}
for (int count = 0; count < lines.size(); count++) {
System.out.println(lines.get(count));
}
} catch (FileNotFoundException ex) {
System.out.println("Unable to open file '" + fileName + "'");
} catch (IOException ex) {
System.out.println("Error reading file '" + fileName + "'");
} catch (Exception e) {
}
}
/**
* Removes the multiple line comment.
*
* @param tempString
* the temp string
* @param count
* the count
* @param lines
* the lines
* @return the string
*/
private static List<String> removeMultipleLineComment(String tempString,
int count, List<String> lines) {
try {
if (tempString.contains("/**") || (tempString.contains("/*"))) {
int StartIndex = count;
while (!(lines.get(count).contains("*/") || lines.get(count)
.contains("**/"))) {
count++;
}
int endIndex = ++count;
if (StartIndex != endIndex) {
while (StartIndex != endIndex) {
lines.set(StartIndex, "");
StartIndex++;
}
}
}
} catch (Exception e) {
// Do Nothing
}
return lines;
}
/**
* Remove single line comments .
*
* @param line
* the line
* @return the string
* @throws Exception
* the exception
*/
private static String removeSingleLineComment(String line) throws Exception {
try {
if (line.contains(("//"))) {
int startIndex = line.indexOf("//");
int endIndex = line.length();
String tempoString = line.substring(startIndex, endIndex);
line = line.replace(tempoString, "");
}
if ((line.contains("/*") || line.contains("/**"))
&& (line.contains("**/") || line.contains("*/"))) {
int startIndex = line.indexOf("/**");
int endIndex = line.length();
String tempoString = line.substring(startIndex, endIndex);
line = line.replace(tempoString, "");
}
} catch (Exception e) {
// Do Nothing
}
return line;
}
}