prettyPrint.kt

fun Any.prettyPrint(): String {
        val sb = StringBuilder()
        val chars = toString().toCharArray()
        var level = 0
        var inString = false
        var inArray = false
        for (char in chars) {
            when (char) {
                '(' -> {
                    if (!inString) {
                        level++
                        sb.append(char)
                        sb.append('\n')
                        sb.append("\t".repeat(level))
                    }
                }
                ')' -> {
                    if (!inString) {
                        level--
                        sb.append('\n')
                        sb.append("\t".repeat(level))
                        sb.append(char)
                    }
                }
                '{' -> {
                    if (!inString) {
                        level++
                        sb.append(char)
                        sb.append('\n')
                        sb.append("\t".repeat(level))
                    }
                }
                '}' -> {
                    if (!inString) {
                        level--
                        sb.append('\n')
                        sb.append("\t".repeat(level))
                        sb.append(char)
                    }
                }
                '=' -> {
                    if (!inString) {
                        sb.append(" = ")
                    }
                }
                ',' -> {
                    if (!inString && !inArray) {
                        sb.append(char)
                        sb.append('\n')
                        sb.append("\t".repeat(level))
                    }
                    else {
                        sb.append(char)
                    }
                }
                ' ' -> {
                    if (!inString && !inArray && sb.lastOrNull() == ',') {
                        // no-op
                    }
                }
                '[' -> {
                    if (!inString) inArray = true
                    sb.append(char)
                }
                ']' -> {
                    if (!inString) inArray = false
                }
                '"' -> {
                    inString = !inString
                    sb.append(char)
                }
                else -> {
                    sb.append(char)
                }
            }
        }
        return sb.toString()
    }