Vulkan-Docs/config/tilde_open_block.rb

66 lines
2.2 KiB
Ruby

require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal'
include ::Asciidoctor
module Asciidoctor
# This addition to the parser class overrides the "is_delimited_block?"
# method of the core parser, adding a new block delimiter of "~~~~" for open
# blocks, which can be extended to an arbitrary number of braces to allow
# nesting them, which is a limitation of the existing "only two dashes"
# delimiter: https://github.com/asciidoctor/asciidoctor/issues/1121
# The choice of tildes is based on comments in that bug.
class Parser
# Storing the original method so we can still call it from the overriding
# version
@OLD_is_delimited_block = method(:is_delimited_block?)
# Logic here matches the original Parser#is_delimited_block? method, see
# there for details of base implementation.
def self.is_delimited_block? line, return_match_data = false
# Quick check for a single brace character before forwarding to the
# original parser method.
if line[0] != '~'
return @OLD_is_delimited_block.(line, return_match_data)
else
line_len = line.length
if line_len <= 4
tip = line
tl = line_len
else
tip = line[0..3]
tl = 4
end
# Hardcoded tilde delimiter, since that's the only thing this
# function deals with.
if tip == '~~~~'
# tip is the full line when delimiter is minimum length
if tl < 4 || tl == line_len
if return_match_data
context = :open
masq = ['comment', 'example', 'literal', 'listing', 'pass', 'quote', 'sidebar', 'source', 'verse', 'admonition', 'abstract', 'partintro'].to_set
BlockMatchData.new(context, masq, tip, tip)
else
true
end
elsif %(#{tip}#{tip[-1..-1] * (line_len - tl)}) == line
if return_match_data
context = :open
masq = ['comment', 'example', 'literal', 'listing', 'pass', 'quote', 'sidebar', 'source', 'verse', 'admonition', 'abstract', 'partintro'].to_set
BlockMatchData.new(context, masq, tip, line)
else
true
end
else
nil
end
else
nil
end
end
end
end
end