proposal: strconv: add QuoteWith or QuoteSingle

[KapJI]

Proposal Details

Add QuoteWith function to allow quoting string with single quotes (\'):

func QuoteWith(s string, quote byte) string {
	return quoteWith(s, quote, false, false)
}

Alternatively, add QuoteSingle with hardcoded argument:

func QuoteSingle(s string) string {
	return quoteWith(s, '\'', false, false)
}

Currently there is UnquoteChar which supports single-quoted strings but there is no easy way to quote strings with single quotes.

Another solution for this was proposed in #34145 but it was rejected because for their case 1 there is a simple alternative. I haven't found such alternative for case 2 though.

[gabyhelp]

Related Issues and Documentation

• proposal: strconv: add a version of QuoteToASCII that doesn't add quotes #34145 (closed)
• strconv: add QuotedPrefix #45033 (closed)
• strconv: update Unquote example to be more concise
• Package strconv > func Unquote ¶
• proposal: strconv: export unquote and appendQuotedWith #51887 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[KapJI]

I found possible workaround which reverts escaping for quote which is done in appendEscapedRune and does it again for single quote this time:

s = strconv.Quote(s)
s = s[1 : len(s)-1]
s = strings.ReplaceAll(s, "\\\"", "\"")
s = strings.ReplaceAll(s, "'", "\\'")

I think it produces correct result but it could definitely help if strconv provided easier way to do this.

[seankhliao]

I believe this is out of scope for strconv: The quoting and escaping rules are for Go, and Go doesn't have single quoted strings. Single quoted strings in different languages / formats have different escaping rules which may conflict, it wouldn't be right to support a particular kind.