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Kommons Test is a Kotlin Multiplatform Library to ease testing.

There is a newer version: 2.8.0

package com.bkahlert.kommons.test

import java.text.MessageFormat
import java.util.regex.Pattern

/** [SLF4J](https://www.slf4j.org/) related features. */
public object SLF4J {

    private const val SLF4J_ANCHOR = "{}"
    private val SLF4J_PATTERN = Pattern.compile(Pattern.quote(SLF4J_ANCHOR))
    private const val MESSAGE_FORMAT_REPLACEMENT = "{%d}"

    /**
     * Formats the specified [slf4jLogMessage] by replacing
     * `{}` placeholders with the specified [args] similar to the
     * way [SLF4J](https://www.slf4j.org/) loggers would do it.
     */
    public fun format(slf4jLogMessage: String, vararg args: Any?): String {
        var messageFormatPattern = slf4jLogMessage
        var index = 0

        var matcher = SLF4J_PATTERN.matcher(messageFormatPattern)
        while (matcher.find()) {
            messageFormatPattern = matcher.replaceFirst(String.format(MESSAGE_FORMAT_REPLACEMENT, index))
            matcher = SLF4J_PATTERN.matcher(messageFormatPattern)
            index++
        }
        val messageFormat = MessageFormat(messageFormatPattern)
        return messageFormat.format(args, StringBuffer(slf4jLogMessage.length shl 1), null).toString()
    }
}