71 lines
2.3 KiB
Ruby
Executable File
71 lines
2.3 KiB
Ruby
Executable File
# -*- coding: utf-8 -*-
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#
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#--
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# Copyright (C) 2009-2010 Thomas Leitner <t_leitner@gmx.at>
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#
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# This file is part of kramdown.
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#
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# kramdown is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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#
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module Kramdown
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module Parser
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class Kramdown
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EMPHASIS_START = /(?:\*\*?|__?)/
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# Parse the emphasis at the current location.
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def parse_emphasis
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result = @src.scan(EMPHASIS_START)
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element = (result.length == 2 ? :strong : :em)
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type = (result =~ /_/ ? '_' : '*')
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reset_pos = @src.pos
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if (type == '_' && @src.pre_match =~ /[[:alpha:]]\z/ && @src.check(/[[:alpha:]]/)) || @src.check(/\s/) ||
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@tree.type == element || @stack.any? {|el, _| el.type == element}
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add_text(result)
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return
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end
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sub_parse = lambda do |delim, elem|
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el = Element.new(elem)
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stop_re = /#{Regexp.escape(delim)}/
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found = parse_spans(el, stop_re) do
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(@src.pre_match[-1, 1] !~ /\s/) &&
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(elem != :em || !@src.match?(/#{Regexp.escape(delim*2)}(?!#{Regexp.escape(delim)})/)) &&
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(type != '_' || !@src.match?(/#{Regexp.escape(delim)}[[:alpha:]]/)) && el.children.size > 0
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end
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[found, el, stop_re]
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end
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found, el, stop_re = sub_parse.call(result, element)
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if !found && element == :strong && @tree.type != :em
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@src.pos = reset_pos - 1
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found, el, stop_re = sub_parse.call(type, :em)
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end
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if found
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@src.scan(stop_re)
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@tree.children << el
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else
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@src.pos = reset_pos
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add_text(result)
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end
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end
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define_parser(:emphasis, EMPHASIS_START, '\*|_')
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end
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end
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end
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