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✏️ Editing: lines.rb

##########################################################################
#
# We store the lines we're working on as objects of class Line.
# These contain the text of the line, along with a flag indicating the
# line type, and an indentation level

module SM

class Line
    INFINITY = 9999

BLANK     = :BLANK
    HEADING   = :HEADING
    LIST      = :LIST
    RULE      = :RULE
    PARAGRAPH = :PARAGRAPH
    VERBATIM  = :VERBATIM
    
    # line type
    attr_accessor :type

# The indentation nesting level
    attr_accessor :level

# The contents
    attr_accessor :text

# A prefix or parameter. For LIST lines, this is
    # the text that introduced the list item (the label)
    attr_accessor  :param

# A flag. For list lines, this is the type of the list
    attr_accessor :flag

# the number of leading spaces
    attr_accessor :leading_spaces

# true if this line has been deleted from the list of lines
    attr_accessor :deleted

def initialize(text)
      @text    = text.dup
      @deleted = false

# expand tabs
      1 while @text.gsub!(/\t+/) { ' ' * (8*$&.length - $`.length % 8)}  && $~ #`

# Strip trailing whitespace
      @text.sub!(/\s+$/, '')

# and look for leading whitespace
      if @text.length > 0
        @text =~ /^(\s*)/
        @leading_spaces = $1.length
      else
        @leading_spaces = INFINITY
      end
    end

# Return true if this line is blank
    def isBlank?
      @text.length.zero?
    end

# stamp a line with a type, a level, a prefix, and a flag
    def stamp(type, level, param="", flag=nil)
      @type, @level, @param, @flag = type, level, param, flag
    end

##
    # Strip off the leading margin
    #

def strip_leading(size)
      if @text.size > size
        @text[0,size] = ""
      else
        @text = ""
      end
    end

def to_s
      "#@type#@level: #@text"
    end
  end

###############################################################################
  #
  # A container for all the lines
  #

class Lines
    include Enumerable

attr_reader :lines   # for debugging

def initialize(lines)
      @lines = lines
      rewind
    end

def empty?
      @lines.size.zero?
    end

def each
      @lines.each do |line|
        yield line unless line.deleted
      end
    end

#    def [](index)
#      @lines[index]
#    end

def rewind
      @nextline = 0
    end

def next
      begin
        res = @lines[@nextline]
        @nextline += 1 if @nextline < @lines.size
      end while res and res.deleted and @nextline < @lines.size
      res
    end

def unget
      @nextline -= 1
    end

def delete(a_line)
      a_line.deleted = true
    end

def normalize
      margin = @lines.collect{|l| l.leading_spaces}.min
      margin = 0 if margin == Line::INFINITY
      @lines.each {|line| line.strip_leading(margin) } if margin > 0
    end

def as_text
      @lines.map {|l| l.text}.join("\n")
    end

def line_types
      @lines.map {|l| l.type }
    end
  end
end

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