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require 'rdoc/markup/simple_markup/lines.rb'
#require 'rdoc/markup/simple_markup/to_flow.rb'
module SM
##
# A Fragment is a chunk of text, subclassed as a paragraph, a list
# entry, or verbatim text
class Fragment
attr_reader :level, :param, :txt
attr_accessor :type
def initialize(level, param, type, txt)
@level = level
@param = param
@type = type
@txt = ""
add_text(txt) if txt
end
def add_text(txt)
@txt << " " if @txt.length > 0
@txt << txt.tr_s("\n ", " ").strip
end
def to_s
"L#@level: #{self.class.name.split('::')[-1]}\n#@txt"
end
######
# This is a simple factory system that lets us associate fragement
# types (a string) with a subclass of fragment
TYPE_MAP = {}
def Fragment.type_name(name)
TYPE_MAP[name] = self
end
def Fragment.for(line)
klass = TYPE_MAP[line.type] ||
raise("Unknown line type: '#{line.type.inspect}:' '#{line.text}'")
return klass.new(line.level, line.param, line.flag, line.text)
end
end
##
# A paragraph is a fragment which gets wrapped to fit. We remove all
# newlines when we're created, and have them put back on output
class Paragraph < Fragment
type_name Line::PARAGRAPH
end
class BlankLine < Paragraph
type_name Line::BLANK
end
class Heading < Paragraph
type_name Line::HEADING
def head_level
@param.to_i
end
end
##
# A List is a fragment with some kind of label
#
class ListBase < Paragraph
# List types
BULLET = :BULLET
NUMBER = :NUMBER
UPPERALPHA = :UPPERALPHA
LOWERALPHA = :LOWERALPHA
LABELED = :LABELED
NOTE = :NOTE
end
class ListItem < ListBase
type_name Line::LIST
# def label
# am = AttributeManager.new(@param)
# am.flow
# end
end
class ListStart < ListBase
def initialize(level, param, type)
super(level, param, type, nil)
end
end
class ListEnd < ListBase
def initialize(level, type)
super(level, "", type, nil)
end
end
##
# Verbatim code contains lines that don't get wrapped.
class Verbatim < Fragment
type_name Line::VERBATIM
def add_text(txt)
@txt << txt.chomp << "\n"
end
end
##
# A horizontal rule
class Rule < Fragment
type_name Line::RULE
end
# Collect groups of lines together. Each group
# will end up containing a flow of text
class LineCollection
def initialize
@fragments = []
end
def add(fragment)
@fragments << fragment
end
def each(&b)
@fragments.each(&b)
end
# For testing
def to_a
@fragments.map {|fragment| fragment.to_s}
end
# Factory for different fragment types
def fragment_for(*args)
Fragment.for(*args)
end
# tidy up at the end
def normalize
change_verbatim_blank_lines
add_list_start_and_ends
add_list_breaks
tidy_blank_lines
end
def to_s
@fragments.join("\n----\n")
end
def accept(am, visitor)
visitor.start_accepting
@fragments.each do |fragment|
case fragment
when Verbatim
visitor.accept_verbatim(am, fragment)
when Rule
visitor.accept_rule(am, fragment)
when ListStart
visitor.accept_list_start(am, fragment)
when ListEnd
visitor.accept_list_end(am, fragment)
when ListItem
visitor.accept_list_item(am, fragment)
when BlankLine
visitor.accept_blank_line(am, fragment)
when Heading
visitor.accept_heading(am, fragment)
when Paragraph
visitor.accept_paragraph(am, fragment)
end
end
visitor.end_accepting
end
#######
private
#######
# If you have:
#
# normal paragraph text.
#
# this is code
#
# and more code
#
# You'll end up with the fragments Paragraph, BlankLine,
# Verbatim, BlankLine, Verbatim, BlankLine, etc
#
# The BlankLine in the middle of the verbatim chunk needs to
# be changed to a real verbatim newline, and the two
# verbatim blocks merged
#
#
def change_verbatim_blank_lines
frag_block = nil
blank_count = 0
@fragments.each_with_index do |frag, i|
if frag_block.nil?
frag_block = frag if Verbatim === frag
else
case frag
when Verbatim
blank_count.times { frag_block.add_text("\n") }
blank_count = 0
frag_block.add_text(frag.txt)
@fragments[i] = nil # remove out current fragment
when BlankLine
if frag_block
blank_count += 1
@fragments[i] = nil
end
else
frag_block = nil
blank_count = 0
end
end
end
@fragments.compact!
end
# List nesting is implicit given the level of
# Make it explicit, just to make life a tad
# easier for the output processors
def add_list_start_and_ends
level = 0
res = []
type_stack = []
@fragments.each do |fragment|
# $stderr.puts "#{level} : #{fragment.class.name} : #{fragment.level}"
new_level = fragment.level
while (level < new_level)
level += 1
type = fragment.type
res << ListStart.new(level, fragment.param, type) if type
type_stack.push type
# $stderr.puts "Start: #{level}"
end
while level > new_level
type = type_stack.pop
res << ListEnd.new(level, type) if type
level -= 1
# $stderr.puts "End: #{level}, #{type}"
end
res << fragment
level = fragment.level
end
level.downto(1) do |i|
type = type_stack.pop
res << ListEnd.new(i, type) if type
end
@fragments = res
end
# now insert start/ends between list entries at the
# same level that have different element types
def add_list_breaks
res = @fragments
@fragments = []
list_stack = []
res.each do |fragment|
case fragment
when ListStart
list_stack.push fragment
when ListEnd
start = list_stack.pop
fragment.type = start.type
when ListItem
l = list_stack.last
if fragment.type != l.type
@fragments << ListEnd.new(l.level, l.type)
start = ListStart.new(l.level, fragment.param, fragment.type)
@fragments << start
list_stack.pop
list_stack.push start
end
else
;
end
@fragments << fragment
end
end
# Finally tidy up the blank lines:
# * change Blank/ListEnd into ListEnd/Blank
# * remove blank lines at the front
def tidy_blank_lines
(@fragments.size - 1).times do |i|
if @fragments[i].kind_of?(BlankLine) and
@fragments[i+1].kind_of?(ListEnd)
@fragments[i], @fragments[i+1] = @fragments[i+1], @fragments[i]
end
end
# remove leading blanks
@fragments.each_with_index do |f, i|
break unless f.kind_of? BlankLine
@fragments[i] = nil
end
@fragments.compact!
end
end
end