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= Block Processor Extension Example
:navtitle: Block Processor
Purpose::
Register a custom block style named `shout` that uppercases all the words and converts periods to exclamation points.
== sample-with-shout-block.adoc
[source,asciidoc]
----
[shout]
The time is now. Get a move on.
----
== ShoutBlock
[source,ruby]
----
require 'asciidoctor'
require 'asciidoctor/extensions'
class ShoutBlock < Asciidoctor::Extensions::BlockProcessor
PeriodRx = /\.(?= |$)/
use_dsl
named :shout
on_context :paragraph
name_positional_attributes 'vol'
parse_content_as :simple
def process parent, reader, attrs
volume = ((attrs.delete 'vol') || 1).to_i
create_paragraph parent, (reader.lines.map {|l| l.upcase.gsub PeriodRx, '!' * volume }), attrs
end
end
----
== Usage
[source,ruby]
----
Asciidoctor::Extensions.register do
block ShoutBlock
end
Asciidoctor.convert_file 'sample-with-shout-block.adoc', safe: :safe
----
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