NotBlankString members as extensions

[LVMVRQUXL]

Description

The problem

Extending the NotBlankString type with an operator like plus is impossible because this operator is shadowed by its function member plus(Any?).

The solution

Declare the operators of the NotBlankString type as extension functions for allowing to extend it with new operators.

Code example

import kotools.types.NotBlankString

val csvExtension = FileExtension.Csv

sealed class FileExtension(private val value: NotBlankString) {
    fun toNotBlankString(): NotBlankString = toString()
    	.toNotBlankString()

    override fun toString(): String = ".$value"
    
    object Csv : FileExtension("csv".toNotBlankString())
}

// This function is shadowed by the NotBlankString.plus(Any?) function.
/** Returns this string suffixed by the [extension]. */
operator fun NotBlankString.plus(extension: FileExtension): NotBlankString = TODO()

fun main(): Unit = println(NotBlankString("file") + csvExtension) // file.csv

Checklist

• Convert query operations members to extensions.
• Convert positional access operations to extensions.
• Convert binary operations to extensions.
• Test.
• Refactor.
• Update Work in progress section in changelog.