在Go中将Unicode代码点转换为文字字符

Question

Let's say I have a text file like this.

\u0053
\u0075
\u006E

Is there a way I can convert that to this?

S
u
n

Currently, I'm using ioutil.ReadFile("data.txt"), but when I print the data, I get the unicode code points instead of the string literals. I realize this is the correct behavior for ReadFile, it's just not want I want.

I'm aiming for a substitution of the code points with their literal characters.

Answer 1

You can use the strconv.Unquote() and strconv.UnquoteChar() functions to do the conversion.

One thing you should be aware of is that strconv.Unquote() can only unquote strings that are in quotes (e.g. start and end with a quote char " or a back quote char `), so we have to manually append that.

See this example:

lines := []string{
    `\u0053`,
    `\u0075`,
    `\u006E`,
}
fmt.Println(lines)

for i, v := range lines {
    var err error
    lines[i], err = strconv.Unquote(`"` + v + `"`)
    if err != nil {
        fmt.Println(err)
    }
}
fmt.Println(lines)

fmt.Println(strconv.Unquote(`"Go\u0070\x68\x65\x72"`))

Output (try it on the Go Playground):

[\u0053 \u0075 \u006E]
[S u n]
Gopher <nil>