How to Normalize Non-ASCII Text Input to ASCII Using the strings.Map Function?

Normalizing Text Input to ASCII

Handling non-ASCII characters in text input can be a challenge, especially when the goal is to normalize them to ASCII equivalents. A common issue arises when encountering curly quotes instead of straight quotes. While custom string replacements can address this issue, the standard library offers a more comprehensive solution.

The strings.Map function provides a mechanism for mapping runes (Unicode characters) to other runes. This approach offers a customizable and generic method for converting non-ASCII characters to ASCII equivalents.

In this case, the following code demonstrates how to use Map to normalize curly quotes to straight quotes:

<code class="go">package main

import (
    "fmt"
    "strings"
)

func main() {
    data := "Hello “Frank” or ‹François› as you like to be ‘called’"
    fmt.Printf("Original: %s\n", data)
    cleanedData := strings.Map(normalize, data)
    fmt.Printf("Cleaned: %s\n", cleanedData)
}

func normalize(in rune) rune {
    switch in {
    case '“', '‹', '”', '›':
        return '"'
    case '‘', '’':
        return '\''
    }
    return in
}</code>

Output

Original: Hello “Frank” or ‹François› as you like to be ‘called’
Cleaned: Hello "Frank" or "François" as you like to be 'called'

By utilizing the strings.Map function, it is possible to define custom mapping rules that handle various non-ASCII characters, ensuring that all input text is normalized to ASCII equivalents as needed.

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