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unicode.go
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unicode.go
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// Copyright (c) 2021 Shivaram Lingamneni
// Released under the MIT License
package ircutils
import (
"strings"
"unicode"
"unicode/utf8"
"github.com/ergochat/irc-go/ircmsg"
)
var TruncateUTF8Safe = ircmsg.TruncateUTF8Safe
// Sanitizes human-readable text to make it safe for IRC;
// assumes UTF-8 and uses the replacement character where
// applicable.
func SanitizeText(message string, byteLimit int) (result string) {
var buf strings.Builder
for _, r := range message {
if r == '\x00' || r == '\r' {
continue
} else if r == '\n' {
if buf.Len()+2 <= byteLimit {
buf.WriteString(" ")
continue
} else {
break
}
} else if unicode.IsSpace(r) {
if buf.Len()+1 <= byteLimit {
buf.WriteString(" ")
} else {
break
}
} else {
rLen := utf8.RuneLen(r)
if buf.Len()+rLen <= byteLimit {
buf.WriteRune(r)
} else {
break
}
}
}
return buf.String()
}