How to insert double quotes into String with interpolation in scala

Question

Having trouble escaping all the quotes in my function

(basic usage of it -> if i find a string do nothing, if its not a string add \" in the begin and end)

Answer 1

How about

s"This is ${"\"" + variable + "\""}" inserted in string with quotes

Answer 2

This is a bug in Scala:

escape does not work with string interpolation

but maybe you can use:

scala> import org.apache.commons.lang.StringEscapeUtils.escapeJava
import org.apache.commons.lang.StringEscapeUtils.escapeJava

scala> escapeJava("this is a string\nover two lines")
res1: java.lang.String = this is a string\nover two lines

Answer 3

It's heavily used in my case, therefore I created this version:

object StringUtil{
    implicit class StringImprovements(s: String) {
        def quoted = "\""+s+"\""
    }
}

val myStatement = s"INSERT INTO ${tableName.quoted} ..."

Answer 4

An example:

scala> val username="admin"
> username: String = admin

scala> val pass="xyz"
> pass: String = xyz

scala> println(s"""{"username":"$username", "pass":"$pass"}""")
> {"username":"admin", "pass":"xyz"}

Answer 5

Another solution (also mentioned in the Scala tracker) is to use

case _ => s"${'"'}$value${'"'}"

Still ugly, but sometimes perhaps may be preferred over triple quotes.

It seems an escape sequence $" was suggested as a part of SIP-24 for 2.12:

case _ => s"$"$value$""

This SIP was never accepted, as it contained other more controversial suggestions. Currently there is an effort to get escape sequence $" implemented in 2.13 as Pre SIP/mini SIP $” escapes in interpolations.