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# -*- coding: utf-8 -*- #
# frozen_string_literal: true
module Rouge
module Lexers
class LiterateHaskell < RegexLexer
title "Literate Haskell"
desc 'Literate haskell'
tag 'literate_haskell'
aliases 'lithaskell', 'lhaskell', 'lhs'
filenames '*.lhs'
mimetypes 'text/x-literate-haskell'
def haskell
@haskell ||= Haskell.new(options)
end
start { haskell.reset! }
# TODO: support TeX versions as well.
state :root do
rule %r/\s*?\n(?=>)/, Text, :code
rule %r/.*?\n/, Text
rule %r/.+\z/, Text
end
state :code do
rule %r/(>)( .*?(\n|\z))/ do |m|
token Name::Label, m[1]
delegate haskell, m[2]
end
rule %r/\s*\n(?=\s*[^>])/, Text, :pop!
end
end
end
end
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