英文:
What's a good way to parse a string based on position using golang?
问题
我正在使用Go语言设计一个简单的应用程序，用于读取几种表示客户文件格式的文件。我的第一个想法是逐行读取每个文件，然后将其解析为一个结构体。到目前为止还不错，但是我需要根据索引来分割每个字段。例如：
line := "1003450020170804890000000022344"
Id从位置1到位置4 = 1003
CustomerId从位置5到7，以及与该结构相关的所有其他字段。
我想知道是否有更高效的方法来读取格式并应用于这个文件行，我考虑为每个字段创建一些结构体，并具有起始和结束字段，但这对我来说听起来有些奇怪。
type Record struct {
Id int
Date time.Time
Value float64
ClientId int32
}
type RecordId struct {
Start int
Finish int
Value int
}
type ClientId struct {
Start int
Finish int
Value int32
}
我不知道我是否走对了方向，也许在这种情况下有更加优雅的方法可以更好地工作。
英文:
I'm designing an simple application using go to read a few file formats representing customers file formats. My first idea is to read each file line and then parse it to an struct. So far so good, but i need to split each field based on it's index. For example:
line := "1003450020170804890000000022344"
Id starts on position 1 to position 4 = 1003
CustomerId is position 5 to 7 and all other fields related to that structure.
I would like to know if there's something more efficient to read a format and apply to this file line, i thought to create some struct for each field and have the start and end fields, but it sounds weird to me.
type Record struct {
Id int
Date time.Time
Value float64
ClientId int32
}
type RecordId struct {
Start int
Finish int
Value int
}
type ClientId struct {
Start int
Finish int
Value int32
}
I don't know if i'm on the way, maybe there's something more elegant that will work better on this case.
答案1
得分: 5
var a, b int
n, err := fmt.Sscanf("1003450020170804890000000022344", "%4d%3d", &a, &b)
if err != nil {
// ...
}
fmt.Println(a) // 1003
fmt.Println(b) // 450
然后你可以使用这些创建一个结构体。
以上是给定的代码段的翻译。
英文:
var a, b int
n, err := fmt.Sscanf("1003450020170804890000000022344", "%4d%3d", &a, &b)
if err != nil {
// ...
}
fmt.Println(a) // 1003
fmt.Println(b) // 450
Then you could create a structure with these.
答案2
得分: 1
一个解析函数很简单，可能已经足够了，而不需要声明辅助数据结构。
例如，可以按照以下方式编写：
func NewRecord(line string) (*Record, error) {
if len(line) < 14 {
return nil, fmt.Errorf("line is too short: %d", len(line))
}
return &Record{
Id: line[0:4],
Name: line[4:14],
}, nil
}
英文:
A parse function is simple and probably sufficient, rather than declaring ancillary data structures.
Eg, something along the lines of:
func NewRecord(line string) (*Record, error) {
if len(line) < 14 {
return nil, fmt.Errorf("line is too short: %d", len(line))
}
return &Record{
Id: line[0:4],
Name: line[4:14],
}, nil
}
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