块处理器扩展示例

目的: 注册一个名为`shout`的自定义块样式，将所有单词变为大写，并将句号转换为感叹号。

'''sample-with-shout-block.adoc'''

大声说：
现在就是时候了。快点行动起来。

ShoutBlock

class ShoutBlock < Asciidoctor::Extensions::BlockProcessor
  PeriodRx = /\.(?= |$)/

使用DSL

ruby
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

使用方法

Asciidoctor::Extensions.register do
  block ShoutBlock
end

Asciidoctor.convert_file 'sample-with-shout-block.adoc', safe: :safe