英文:
Adding a new method to an existing (standard) type
问题
我正在编写一些代码，需要使用bufio包中的ReadBytes方法提供的功能。具体来说，该方法从Reader中读取，直到遇到特定的字节。我需要的是读取到遇到其中一个字节（主要是空格、换行和制表符）为止。
我查看了该库的源代码，如果我可以访问bufio结构体使用的内部缓冲区，我知道该怎么做。是否有办法“猴子补丁”该包并添加另一个或两个方法？或者有其他方法可以获得我所需的功能？
英文:
I'm writing some code that needs functionality that is almost satisfied by the ReadBytes method in the bufio package. Specifically, that method reads from a Reader until it encounters a particular byte. I need something that reads till it encounters one out of couple of bytes (space, newline and tab mainly).
I looked at the source for the library and I know what to do if I have access to the internal buffer used by bufio structs. Is there any way I could "monkey patch" the package and add another method or two to it? Or another way to get the functionality I need?
答案1
得分: 5
type reader struct{
*bufio.Reader // 'reader'继承了所有bufio.Reader的方法
}
func newReader(rd io.Reader) reader {
return reader{bufio.NewReader(rd)}
}
// 重写bufio.Reader.ReadBytes
func (r reader) ReadBytes(delim byte) (line []byte, err error) {
// 这里是猴子补丁
}
// 或者
// 给bufio.Reader添加一个新的方法
func (r reader) ReadBytesEx(delims []byte) (line []byte, err error) {
// 这里是新的代码
}
编辑：我应该注意到这个方法不能访问原始包的内部（非导出实体）。感谢Abhay在评论中指出这一点。
英文:
Something along this approach (caution: untested code):
type reader struct{
*bufio.Reader // 'reader' inherits all bufio.Reader methods
}
func newReader(rd io.Reader) reader {
return reader{bufio.NewReader(rd)}
}
// Override bufio.Reader.ReadBytes
func (r reader) ReadBytes(delim byte) (line []byte, err error) {
// here goes the monkey patch
}
// Or
// Add a new method to bufio.Reader
func (r reader) ReadBytesEx(delims []byte) (line []byte, err error) {
// here goes the new code
}
EDIT: I should have noted that this doesn't help to access the original package internals (non exported entities). Thanks Abhay for pointing that out in your comment.
答案2
得分: 1
通常最好使用软件包API来解决问题。但如果你有充分的理由需要访问未导出的功能，可以复制软件包源代码并进行修改。BSD风格的许可证非常自由。
英文:
It's usually best to solve problems using the package API. If you have a compelling reason to access unexported features though, copy the package source and hack it up. The BSD-style license as about as liberal as they come.
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