# -*- coding: utf-8; frozen_string_literal: true -*- # #-- # Copyright (C) 2009-2019 Thomas Leitner # # This file is part of kramdown which is licensed under the MIT. #++ # module Kramdown module Parser class Kramdown EMPHASIS_START = /(?:\*\*?|__?)/ # Parse the emphasis at the current location. def parse_emphasis start_line_number = @src.current_line_number saved_pos = @src.save_pos result = @src.scan(EMPHASIS_START) element = (result.length == 2 ? :strong : :em) type = result[0..0] if (type == '_' && @src.pre_match =~ /[[:alpha:]-]\z/) || @src.check(/\s/) || @tree.type == element || @stack.any? {|el, _| el.type == element } add_text(result) return end sub_parse = lambda do |delim, elem| el = Element.new(elem, nil, nil, location: start_line_number) stop_re = /#{Regexp.escape(delim)}/ found = parse_spans(el, stop_re) do (@src.pre_match[-1, 1] !~ /\s/) && (elem != :em || !@src.match?(/#{Regexp.escape(delim * 2)}(?!#{Regexp.escape(delim)})/)) && (type != '_' || !@src.match?(/#{Regexp.escape(delim)}[[:alnum:]]/)) && !el.children.empty? end [found, el, stop_re] end found, el, stop_re = sub_parse.call(result, element) if !found && element == :strong && @tree.type != :em @src.revert_pos(saved_pos) @src.pos += 1 found, el, stop_re = sub_parse.call(type, :em) end if found @src.scan(stop_re) @tree.children << el else @src.revert_pos(saved_pos) @src.pos += result.length add_text(result) end end define_parser(:emphasis, EMPHASIS_START, '\*|_') end end end