ValidCodeBlocks.yml

---
extends: script
level: error
message: "Unterminated listing block found in file."
link: https://docs.asciidoctor.org/asciidoc/latest/verbatim/listing-blocks/
scope: raw
script: |
  text := import("text")
  matches := []

  // clean out multi-line comments
  scope = text.re_replace("(?s) *(\n////.*?////\n)", scope, "")
  //add a newline, it might be missing
  scope += "\n"

  listingblock_delim_regex := "^-{4}$"
  count := 0

  for line in text.split(scope, "\n") {
    // trim trailing whitespace
    line = text.trim_space(line)
    if text.re_match(listingblock_delim_regex, line) {
      count += 1
      start := text.index(scope, line)
      matches = append(matches, {begin: start, end: start + len(line)})
    } else if count > 1 {
      count = 0 // listing block is closed, reset the count
      matches = []
    }
  }