In the multi-language sample declaration，we can write the code：
.Customizing what Gradle logs
====
include::sample[dir="snippets/initScripts/customLogger/groovy",files="init.gradle[]"]
include::sample[dir="snippets/initScripts/customLogger/kotlin",files="customLogger.init.gradle.kts[]"]
====
how is it parsed into html？
this is the official explanation：
include::sample: invokes the SampleIncludeProcessor asciidoctor extension, with a dir relative to src/snippets/, and a list of files separated by ; (only 1 in this example), each with optional tags=... (like Asciidoctor’s tags mechanism). We write this once for each DSL dialect. This notes to our front-end code to group these 2 samples and show them with selector tabs.
but i didn’t find SampleIncludeProcessor in the project and dependency library。
What is his parsing mechanism?