594 lines
15 KiB
Ruby
594 lines
15 KiB
Ruby
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#--
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# Copyright (C) 2006 Andrea Censi <andrea (at) rubyforge.org>
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#
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# This file is part of Maruku.
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#
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# Maruku 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 2 of the License, or
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# (at your option) any later version.
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#
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# Maruku 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 Maruku; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#++
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module MaRuKu; module In; module Markdown; module BlockLevelParser
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include Helpers
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include MaRuKu::Strings
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include MaRuKu::In::Markdown::SpanLevelParser
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class BlockContext < Array
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def describe
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n = 5
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desc = size > n ? self[-n,n] : self
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"Last #{n} elements: "+
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desc.map{|x| "\n -" + x.inspect}.join
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end
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end
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# Splits the string and calls parse_lines_as_markdown
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def parse_text_as_markdown(text)
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lines = split_lines(text)
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src = LineSource.new(lines)
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return parse_blocks(src)
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end
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# Input is a LineSource
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def parse_blocks(src)
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output = BlockContext.new
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# run state machine
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while src.cur_line
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next if check_block_extensions(src, output, src.cur_line)
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# Prints detected type (useful for debugging)
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# puts "#{src.cur_line.md_type}|#{src.cur_line}"
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case src.cur_line.md_type
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when :empty;
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output.push :empty
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src.ignore_line
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when :ial
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m = InlineAttributeList.match src.shift_line
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content = m[1] || ""
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src2 = CharSource.new(content, src)
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interpret_extension(src2, output, [nil])
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when :ald
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output.push read_ald(src)
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when :text
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if src.cur_line =~ MightBeTableHeader and
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(src.next_line && src.next_line =~ TableSeparator)
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output.push read_table(src)
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elsif [:header1,:header2].include? src.next_line.md_type
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output.push read_header12(src)
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elsif eventually_comes_a_def_list(src)
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definition = read_definition(src)
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if output.last.kind_of?(MDElement) &&
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output.last.node_type == :definition_list then
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output.last.children << definition
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else
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output.push md_el(:definition_list, [definition])
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end
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else # Start of a paragraph
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output.push read_paragraph(src)
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end
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when :header2, :hrule
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# hrule
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src.shift_line
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output.push md_hrule()
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when :header3
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output.push read_header3(src)
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when :ulist, :olist
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list_type = src.cur_line.md_type == :ulist ? :ul : :ol
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li = read_list_item(src)
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# append to current list if we have one
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if output.last.kind_of?(MDElement) &&
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output.last.node_type == list_type then
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output.last.children << li
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else
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output.push md_el(list_type, [li])
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end
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when :quote; output.push read_quote(src)
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when :code; e = read_code(src); output << e if e
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when :raw_html; e = read_raw_html(src); output << e if e
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when :footnote_text; output.push read_footnote_text(src)
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when :ref_definition; output.push read_ref_definition(src)
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when :abbreviation; output.push read_abbreviation(src)
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when :xml_instr; read_xml_instruction(src, output)
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when :metadata;
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maruku_error "Please use the new meta-data syntax: \n"+
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" http://maruku.rubyforge.org/proposal.html\n", src
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src.ignore_line
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else # warn if we forgot something
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md_type = src.cur_line.md_type
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line = src.cur_line
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maruku_error "Ignoring line '#{line}' type = #{md_type}", src
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src.shift_line
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end
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end
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merge_ial(output, src, output)
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output.delete_if {|x| x.kind_of?(MDElement) &&
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x.node_type == :ial}
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# get rid of empty line markers
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output.delete_if {|x| x == :empty}
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# See for each list if we can omit the paragraphs and use li_span
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# TODO: do this after
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output.each do |c|
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# Remove paragraphs that we can get rid of
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if [:ul,:ol].include? c.node_type
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if c.children.all? {|li| !li.want_my_paragraph} then
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c.children.each do |d|
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d.node_type = :li_span
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d.children = d.children[0].children
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end
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end
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end
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if c.node_type == :definition_list
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if c.children.all?{|defi| !defi.want_my_paragraph} then
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c.children.each do |definition|
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definition.definitions.each do |dd|
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dd.children = dd.children[0].children
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end
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end
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end
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end
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end
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output
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end
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def read_ald(src)
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if (l=src.shift_line) =~ AttributeDefinitionList
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id = $1; al=$2;
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al = read_attribute_list(CharSource.new(al,src), context=nil, break_on=[nil])
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self.ald[id] = al;
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return md_ald(id, al)
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else
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maruku_error "Bug Bug:\n#{l.inspect}"
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return nil
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end
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end
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# reads a header (with ----- or ========)
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def read_header12(src)
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line = src.shift_line.strip
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al = nil
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# Check if there is an IAL
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if new_meta_data? and line =~ /^(.*)\{(.*)\}\s*$/
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line = $1.strip
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ial = $2
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al = read_attribute_list(CharSource.new(ial,src), context=nil, break_on=[nil])
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end
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text = parse_lines_as_span [ line ]
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level = src.cur_line.md_type == :header2 ? 2 : 1;
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src.shift_line
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return md_header(level, text, al)
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end
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# reads a header like '#### header ####'
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def read_header3(src)
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line = src.shift_line.strip
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al = nil
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# Check if there is an IAL
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if new_meta_data? and line =~ /^(.*)\{(.*)\}\s*$/
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line = $1.strip
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ial = $2
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al = read_attribute_list(CharSource.new(ial,src), context=nil, break_on=[nil])
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end
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level = num_leading_hashes(line)
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text = parse_lines_as_span [strip_hashes(line)]
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return md_header(level, text, al)
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end
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def read_xml_instruction(src, output)
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m = /^\s*<\?((\w+)\s*)?(.*)$/.match src.shift_line
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raise "BugBug" if not m
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target = m[2] || ''
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code = m[3]
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until code =~ /\?>/
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code += "\n"+src.shift_line
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end
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if not code =~ (/\?>\s*$/)
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garbage = (/\?>(.*)$/.match(code))[1]
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maruku_error "Trailing garbage on last line: #{garbage.inspect}:\n"+
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add_tabs(code, 1, '|'), src
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end
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code.gsub!(/\?>\s*$/, '')
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if target == 'mrk' && MaRuKu::Globals[:unsafe_features]
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result = safe_execute_code(self, code)
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if result
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if result.kind_of? String
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raise "Not expected"
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else
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output.push *result
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end
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end
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else
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output.push md_xml_instr(target, code)
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end
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end
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def read_raw_html(src)
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h = HTMLHelper.new
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begin
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h.eat_this(l=src.shift_line)
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# puts "\nBLOCK:\nhtml -> #{l.inspect}"
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while src.cur_line and not h.is_finished?
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l=src.shift_line
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# puts "html -> #{l.inspect}"
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h.eat_this "\n"+l
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end
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rescue Exception => e
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ex = e.inspect + e.backtrace.join("\n")
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maruku_error "Bad block-level HTML:\n#{add_tabs(ex,1,'|')}\n", src
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end
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raw_html = h.stuff_you_read
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return md_html(raw_html)
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end
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def read_paragraph(src)
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lines = []
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while src.cur_line
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# :olist does not break
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case t = src.cur_line.md_type
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when :quote,:header3,:empty,:raw_html,:ref_definition,:ial,:xml_instr
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break
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when :olist,:ulist
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break if src.next_line.md_type == t
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end
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break if src.cur_line.strip.size == 0
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break if [:header1,:header2].include? src.next_line.md_type
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break if any_matching_block_extension?(src.cur_line)
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lines << src.shift_line
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end
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# dbg_describe_ary(lines, 'PAR')
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children = parse_lines_as_span(lines, src)
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return md_par(children)
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end
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# Reads one list item, either ordered or unordered.
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def read_list_item(src)
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parent_offset = src.cur_index
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item_type = src.cur_line.md_type
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first = src.shift_line
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# Ugly things going on inside `read_indented_content`
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indentation = spaces_before_first_char(first)
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break_list = [:ulist, :olist, :ial]
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lines, want_my_paragraph =
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read_indented_content(src,indentation, break_list, item_type)
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# add first line
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# Strip first '*', '-', '+' from first line
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stripped = first[indentation, first.size-1]
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lines.unshift stripped
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#dbg_describe_ary(lines, 'LIST ITEM ')
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src2 = LineSource.new(lines, src, parent_offset)
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children = parse_blocks(src2)
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with_par = want_my_paragraph || (children.size>1)
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return md_li(children, with_par)
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end
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def read_abbreviation(src)
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if not (l=src.shift_line) =~ Abbreviation
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maruku_error "Bug: it's Andrea's fault. Tell him.\n#{l.inspect}"
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end
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abbr = $1
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desc = $2
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if (not abbr) or (abbr.size==0)
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maruku_error "Bad abbrev. abbr=#{abbr.inspect} desc=#{desc.inspect}"
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end
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self.abbreviations[abbr] = desc
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return md_abbr_def(abbr, desc)
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end
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def read_footnote_text(src)
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parent_offset = src.cur_index
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first = src.shift_line
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if not first =~ FootnoteText
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maruku_error "Bug (it's Andrea's fault)"
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end
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id = $1
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text = $2
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# Ugly things going on inside `read_indented_content`
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indentation = 4 #first.size-text.size
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# puts "id =_#{id}_; text=_#{text}_ indent=#{indentation}"
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break_list = [:footnote_text]
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item_type = :footnote_text
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lines, want_my_paragraph =
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read_indented_content(src,indentation, break_list, item_type)
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# add first line
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if text && text.strip != "" then lines.unshift text end
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# dbg_describe_ary(lines, 'FOOTNOTE')
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src2 = LineSource.new(lines, src, parent_offset)
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children = parse_blocks(src2)
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e = md_footnote(id, children)
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self.footnotes[id] = e
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return e
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end
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# This is the only ugly function in the code base.
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# It is used to read list items, descriptions, footnote text
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def read_indented_content(src, indentation, break_list, item_type)
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lines =[]
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# collect all indented lines
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saw_empty = false; saw_anything_after = false
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while src.cur_line
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#puts "#{src.cur_line.md_type} #{src.cur_line.inspect}"
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if src.cur_line.md_type == :empty
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saw_empty = true
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lines << src.shift_line
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next
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end
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# after a white line
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if saw_empty
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# we expect things to be properly aligned
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if (ns=number_of_leading_spaces(src.cur_line)) < indentation
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#puts "breaking for spaces, only #{ns}: #{src.cur_line}"
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break
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end
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saw_anything_after = true
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else
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break if break_list.include? src.cur_line.md_type
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# break if src.cur_line.md_type != :text
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end
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stripped = strip_indent(src.shift_line, indentation)
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lines << stripped
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|
#puts "Accepted as #{stripped.inspect}"
|
||
|
|
|
||
|
|
# You are only required to indent the first line of
|
||
|
|
# a child paragraph.
|
||
|
|
if stripped.md_type == :text
|
||
|
|
while src.cur_line && (src.cur_line.md_type == :text)
|
||
|
|
lines << strip_indent(src.shift_line, indentation)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
want_my_paragraph = saw_anything_after ||
|
||
|
|
(saw_empty && (src.cur_line && (src.cur_line.md_type == item_type)))
|
||
|
|
|
||
|
|
# dbg_describe_ary(lines, 'LI')
|
||
|
|
# create a new context
|
||
|
|
|
||
|
|
while lines.last && (lines.last.md_type == :empty)
|
||
|
|
lines.pop
|
||
|
|
end
|
||
|
|
|
||
|
|
return lines, want_my_paragraph
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
def read_quote(src)
|
||
|
|
parent_offset = src.cur_index
|
||
|
|
|
||
|
|
lines = []
|
||
|
|
# collect all indented lines
|
||
|
|
while src.cur_line && src.cur_line.md_type == :quote
|
||
|
|
lines << unquote(src.shift_line)
|
||
|
|
end
|
||
|
|
# dbg_describe_ary(lines, 'QUOTE')
|
||
|
|
|
||
|
|
src2 = LineSource.new(lines, src, parent_offset)
|
||
|
|
children = parse_blocks(src2)
|
||
|
|
return md_quote(children)
|
||
|
|
end
|
||
|
|
|
||
|
|
def read_code(src)
|
||
|
|
# collect all indented lines
|
||
|
|
lines = []
|
||
|
|
while src.cur_line && ([:code, :empty].include? src.cur_line.md_type)
|
||
|
|
lines << strip_indent(src.shift_line, 4)
|
||
|
|
end
|
||
|
|
|
||
|
|
#while lines.last && (lines.last.md_type == :empty )
|
||
|
|
while lines.last && lines.last.strip.size == 0
|
||
|
|
lines.pop
|
||
|
|
end
|
||
|
|
|
||
|
|
while lines.first && lines.first.strip.size == 0
|
||
|
|
lines.shift
|
||
|
|
end
|
||
|
|
|
||
|
|
return nil if lines.empty?
|
||
|
|
|
||
|
|
source = lines.join("\n")
|
||
|
|
|
||
|
|
# dbg_describe_ary(lines, 'CODE')
|
||
|
|
|
||
|
|
return md_codeblock(source)
|
||
|
|
end
|
||
|
|
|
||
|
|
# Reads a series of metadata lines with empty lines in between
|
||
|
|
def read_metadata(src)
|
||
|
|
hash = {}
|
||
|
|
while src.cur_line
|
||
|
|
case src.cur_line.md_type
|
||
|
|
when :empty; src.shift_line
|
||
|
|
when :metadata; hash.merge! parse_metadata(src.shift_line)
|
||
|
|
else break
|
||
|
|
end
|
||
|
|
end
|
||
|
|
hash
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
def read_ref_definition(src)
|
||
|
|
line = src.shift_line
|
||
|
|
|
||
|
|
# if link is incomplete, shift next line
|
||
|
|
if src.cur_line && (src.cur_line.md_type != :ref_definition) &&
|
||
|
|
([1,2,3].include? number_of_leading_spaces(src.cur_line) )
|
||
|
|
line += " "+ src.shift_line
|
||
|
|
end
|
||
|
|
|
||
|
|
# puts "total= #{line}"
|
||
|
|
|
||
|
|
match = LinkRegex.match(line)
|
||
|
|
if not match
|
||
|
|
error "Link does not respect format: '#{line}'"
|
||
|
|
end
|
||
|
|
|
||
|
|
id = match[1]; url = match[2]; title = match[3];
|
||
|
|
id = id.strip.downcase
|
||
|
|
|
||
|
|
hash = self.refs[id] = {:url=>url,:title=>title}
|
||
|
|
|
||
|
|
stuff=match[4]
|
||
|
|
|
||
|
|
if stuff
|
||
|
|
stuff.split.each do |couple|
|
||
|
|
# puts "found #{couple}"
|
||
|
|
k, v = couple.split('=')
|
||
|
|
v ||= ""
|
||
|
|
if v[0,1]=='"' then v = v[1, v.size-2] end
|
||
|
|
# puts "key:_#{k}_ value=_#{v}_"
|
||
|
|
hash[k.to_sym] = v
|
||
|
|
end
|
||
|
|
end
|
||
|
|
# puts hash.inspect
|
||
|
|
|
||
|
|
return md_ref_def(id, url, meta={:title=>title})
|
||
|
|
end
|
||
|
|
|
||
|
|
def read_table(src)
|
||
|
|
|
||
|
|
def split_cells(s)
|
||
|
|
s.strip.split('|').select{|x|x.strip.size>0}.map{|x|x.strip}
|
||
|
|
end
|
||
|
|
|
||
|
|
head = split_cells(src.shift_line).map{|s| md_el(:head_cell, parse_lines_as_span([s])) }
|
||
|
|
|
||
|
|
separator=split_cells(src.shift_line)
|
||
|
|
|
||
|
|
align = separator.map { |s| s =~ Sep
|
||
|
|
if $1 and $2 then :center elsif $2 then :right else :left end }
|
||
|
|
|
||
|
|
num_columns = align.size
|
||
|
|
|
||
|
|
if head.size != num_columns
|
||
|
|
maruku_error "Table head does not have #{num_columns} columns: \n#{head.inspect}"
|
||
|
|
tell_user "I will ignore this table."
|
||
|
|
# XXX try to recover
|
||
|
|
return md_br()
|
||
|
|
end
|
||
|
|
|
||
|
|
rows = []
|
||
|
|
|
||
|
|
while src.cur_line && src.cur_line =~ /\|/
|
||
|
|
row = split_cells(src.shift_line).map{|s|
|
||
|
|
md_el(:cell, parse_lines_as_span([s]))}
|
||
|
|
if head.size != num_columns
|
||
|
|
maruku_error "Row does not have #{num_columns} columns: \n#{row.inspect}"
|
||
|
|
tell_user "I will ignore this table."
|
||
|
|
# XXX try to recover
|
||
|
|
return md_br()
|
||
|
|
end
|
||
|
|
rows << row
|
||
|
|
end
|
||
|
|
|
||
|
|
children = (head+rows).flatten
|
||
|
|
return md_el(:table, children, {:align => align})
|
||
|
|
end
|
||
|
|
|
||
|
|
# If current line is text, a definition list is coming
|
||
|
|
# if 1) text,empty,[text,empty]*,definition
|
||
|
|
|
||
|
|
def eventually_comes_a_def_list(src)
|
||
|
|
future = src.tell_me_the_future
|
||
|
|
ok = future =~ %r{^t+e?d}x
|
||
|
|
# puts "future: #{future} - #{ok}"
|
||
|
|
ok
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
def read_definition(src)
|
||
|
|
# Read one or more terms
|
||
|
|
terms = []
|
||
|
|
while src.cur_line && src.cur_line.md_type == :text
|
||
|
|
terms << md_el(:definition_term, parse_lines_as_span([src.shift_line]))
|
||
|
|
end
|
||
|
|
# dbg_describe_ary(terms, 'DT')
|
||
|
|
|
||
|
|
want_my_paragraph = false
|
||
|
|
|
||
|
|
raise "Chunky Bacon!" if not src.cur_line
|
||
|
|
|
||
|
|
# one optional empty
|
||
|
|
if src.cur_line.md_type == :empty
|
||
|
|
want_my_paragraph = true
|
||
|
|
src.shift_line
|
||
|
|
end
|
||
|
|
|
||
|
|
raise "Chunky Bacon!" if src.cur_line.md_type != :definition
|
||
|
|
|
||
|
|
# Read one or more definitions
|
||
|
|
definitions = []
|
||
|
|
while src.cur_line && src.cur_line.md_type == :definition
|
||
|
|
parent_offset = src.cur_index
|
||
|
|
|
||
|
|
first = src.shift_line
|
||
|
|
first =~ Definition
|
||
|
|
first = $1
|
||
|
|
|
||
|
|
# I know, it's ugly!!!
|
||
|
|
|
||
|
|
lines, w_m_p =
|
||
|
|
read_indented_content(src,4, [:definition], :definition)
|
||
|
|
want_my_paragraph ||= w_m_p
|
||
|
|
|
||
|
|
lines.unshift first
|
||
|
|
|
||
|
|
# dbg_describe_ary(lines, 'DD')
|
||
|
|
src2 = LineSource.new(lines, src, parent_offset)
|
||
|
|
children = parse_blocks(src2)
|
||
|
|
definitions << md_el(:definition_data, children)
|
||
|
|
end
|
||
|
|
|
||
|
|
return md_el(:definition, terms+definitions, {
|
||
|
|
:terms => terms,
|
||
|
|
:definitions => definitions,
|
||
|
|
:want_my_paragraph => want_my_paragraph})
|
||
|
|
end
|
||
|
|
end # BlockLevelParser
|
||
|
|
end # MaRuKu
|
||
|
|
end
|
||
|
|
end
|