`java.lang.IndexOutOfBoundsException` indexing `com.fasterxml.jackson.module__jackson-module-kotlin__2.11.4`

[olafurpg]

[info] Caused by: java.lang.IndexOutOfBoundsException: start -1, end -1, length 0
[info] 	at java.base/java.lang.AbstractStringBuilder.checkRange(AbstractStringBuilder.java:1802)
[info] 	at java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:680)
[info] 	at java.base/java.lang.StringBuilder.append(StringBuilder.java:218)
[info] 	at com.sourcegraph.semanticdb_kotlinc.SemanticdbTextDocumentBuilder.stripKDocAsterisks(SemanticdbTextDocumentBuilder.kt:160)

[marcleblanc2]

Customer 8682 has reported this in support ticket 13497, and suggests a fix:

"Not sure where the best place the to send this is, but there’s a bug in the precise code indexer for Kotlin which is preventing me from indexing any of our code.

The bug seems to be here: sourcegraph/lsif-kotlin/-/blob/semanticdb-kotlinc/src/main/kotlin/com/sourcegraph/semanticdb_kotlinc/SemanticdbTextDocumentBuilder.kt?L136

Somebody needs to add a check for 0 length lines e.g.

    private fun stripKDocAsterisks(kdoc: String): String {
        if (kdoc.isEmpty()) return kdoc
        val out = StringBuilder().append("\n\n").append("----").append("\n")
        kdoc.lineSequence().forEach { line ->
            if (line.length <= 0) { continue } // Suggested adding this check
            var start = 0
            while (start < line.length && line[start].isWhitespace()) {
                start++
            }
            if (start < line.length && line[start] == '/') {
                start++
            }
            while (start < line.length && line[start] == '*') {
                start++
            }
            var end = line.length - 1
            if (end > start && line[end] == '/') {
                end--
            }
            while (end > start && line[end] == '*') {
                end--
            }
            while (end > start && line[end].isWhitespace()) {
                end--
            }
            start = minOf(start, line.length - 1)
            if (end > start) {
                end++
            }
            out.append("\n").append(line, start, end)
        }
        return out.toString()
    }