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✏️ Editing: ri_formatter.rb

module RI
  class TextFormatter

attr_reader :indent
    
    def initialize(options, indent)
      @options = options
      @width   = options.width
      @indent  = indent
    end
    
    
    ######################################################################
    
    def draw_line(label=nil)
      len = @width
      len -= (label.size+1) if label
      print "-"*len
      if label
        print(" ")
        bold_print(label) 
      end
      puts
    end
    
    ######################################################################
    
    def wrap(txt,  prefix=@indent, linelen=@width)
      return unless txt && !txt.empty?
      work = conv_markup(txt)
      textLen = linelen - prefix.length
      patt = Regexp.new("^(.{0,#{textLen}})[ \n]")
      next_prefix = prefix.tr("^ ", " ")

res = []

while work.length > textLen
 if work =~ patt
 res << $1
 work.slice!(0, $&.length)
 else
 res << work.slice!(0, textLen)
 end
 end
 res << work if work.length.nonzero?
 puts(prefix + res.join("\n" + next_prefix))
 end

######################################################################

def blankline
      puts
    end
    
    ######################################################################

# called when we want to ensure a nbew 'wrap' starts on a newline
    # Only needed for HtmlFormatter, because the rest do their
    # own line breaking

def break_to_newline
    end
    
    ######################################################################

def bold_print(txt)
      print txt
    end

######################################################################

def raw_print_line(txt)
      puts txt
    end

######################################################################

# convert HTML entities back to ASCII
 def conv_html(txt)
 txt.
 gsub(/&gt;/, '>').
 gsub(/&lt;/, '<').
 gsub(/&quot;/, '"').
 gsub(/&amp;/, '&')
 
 end

# convert markup into display form
 def conv_markup(txt)
 txt.
 gsub(%r{<tt>(.*?)</tt>}) { "+#$1+" } .
 gsub(%r{<code>(.*?)</code>}) { "+#$1+" } .
 gsub(%r{(.*?)}) { "*#$1*" } .
 gsub(%r{(.*?)}) { "_#$1_" }
 end

######################################################################

def display_list(list)
      case list.type

when SM::ListBase::BULLET 
        prefixer = proc { |ignored| @indent + "*   " }

when SM::ListBase::NUMBER,
      SM::ListBase::UPPERALPHA,
      SM::ListBase::LOWERALPHA

start = case list.type
                when SM::ListBase::NUMBER      then 1
                when  SM::ListBase::UPPERALPHA then 'A'
                when SM::ListBase::LOWERALPHA  then 'a'
                end
        prefixer = proc do |ignored|
          res = @indent + "#{start}.".ljust(4)
          start = start.succ
          res
        end
        
      when SM::ListBase::LABELED
        prefixer = proc do |li|
          li.label
        end

when SM::ListBase::NOTE
        longest = 0
        list.contents.each do |item|
          if item.kind_of?(SM::Flow::LI) && item.label.length > longest
            longest = item.label.length
          end
        end

prefixer = proc do |li|
          @indent + li.label.ljust(longest+1)
        end

else
        fail "unknown list type"

end

list.contents.each do |item|
        if item.kind_of? SM::Flow::LI
          prefix = prefixer.call(item)
          display_flow_item(item, prefix)
        else
          display_flow_item(item)
        end
       end
    end

######################################################################

def display_flow_item(item, prefix=@indent)
      case item
      when SM::Flow::P, SM::Flow::LI
        wrap(conv_html(item.body), prefix)
        blankline
        
      when SM::Flow::LIST
        display_list(item)

when SM::Flow::VERB
        display_verbatim_flow_item(item, @indent)

when SM::Flow::H
        display_heading(conv_html(item.text), item.level, @indent)

when SM::Flow::RULE
        draw_line

else
        fail "Unknown flow element: #{item.class}"
      end
    end

######################################################################

def display_verbatim_flow_item(item, prefix=@indent)
        item.body.split(/\n/).each do |line|
          print @indent, conv_html(line), "\n"
        end
        blankline
    end

######################################################################

def display_heading(text, level, indent)
      text = strip_attributes(text)
      case level
      when 1
        ul = "=" * text.length
        puts
        puts text.upcase
        puts ul
#        puts
        
      when 2
        ul = "-" * text.length
        puts
        puts text
        puts ul
#        puts
      else
        print indent, text, "\n"
      end
    end

def display_flow(flow)
      flow.each do |f|
        display_flow_item(f)
      end
    end

def strip_attributes(txt)
 tokens = txt.split(%r{(</?(?:b|code|em|i|tt)>)})
 text = [] 
 attributes = 0
 tokens.each do |tok|
 case tok
 when %r{^</(\w+)>$}, %r{^<(\w+)>$}
 ;
 else
 text << tok
 end
 end
 text.join
 end

end
 
 
 ######################################################################
 # Handle text with attributes. We're a base class: there are
 # different presentation classes (one, for example, uses overstrikes
 # to handle bold and underlining, while another using ANSI escape
 # sequences
 
 class AttributeFormatter < TextFormatter
 
 BOLD = 1
 ITALIC = 2
 CODE = 4

ATTR_MAP = {
      "b"    => BOLD,
      "code" => CODE,
      "em"   => ITALIC,
      "i"    => ITALIC,
      "tt"   => CODE
    }

# TODO: struct?
    class AttrChar
      attr_reader :char
      attr_reader :attr

def initialize(char, attr)
        @char = char
        @attr = attr
      end
    end

class AttributeString
      attr_reader :txt

def initialize
        @txt = []
        @optr = 0
      end

def <<(char)
 @txt << char
 end

def empty?
        @optr >= @txt.length
      end

# accept non space, then all following spaces
      def next_word
        start = @optr
        len = @txt.length

while @optr < len && @txt[@optr].char != " "
 @optr += 1
 end

while @optr < len && @txt[@optr].char == " "
 @optr += 1
 end

@txt[start...@optr]
      end
    end

######################################################################
 # overrides base class. Looks for <tt>...</tt> etc sequences
 # and generates an array of AttrChars. This array is then used
 # as the basis for the split

def wrap(txt,  prefix=@indent, linelen=@width)
      return unless txt && !txt.empty?

txt = add_attributes_to(txt)
      next_prefix = prefix.tr("^ ", " ")
      linelen -= prefix.size

line = []

until txt.empty?
        word = txt.next_word
        if word.size + line.size > linelen
          write_attribute_text(prefix, line)
          prefix = next_prefix
          line = []
        end
        line.concat(word)
      end

write_attribute_text(prefix, line) if line.length > 0
    end

protected

# overridden in specific formatters

def write_attribute_text(prefix, line)
      print prefix
      line.each do |achar|
        print achar.char
      end
      puts
    end

# again, overridden

def bold_print(txt)
      print txt
    end

private

def add_attributes_to(txt)
 tokens = txt.split(%r{(</?(?:b|code|em|i|tt)>)})
 text = AttributeString.new
 attributes = 0
 tokens.each do |tok|
 case tok
 when %r{^</(\w+)>$} then attributes &= ~(ATTR_MAP[$1]||0)
 when %r{^<(\w+)>$} then attributes |= (ATTR_MAP[$1]||0)
 else
 tok.split(//).each {|ch| text << AttrChar.new(ch, attributes)}
 end
 end
 text
 end

end

##################################################
  
  # This formatter generates overstrike-style formatting, which
  # works with pagers such as man and less.

class OverstrikeFormatter < AttributeFormatter

BS = "\C-h"

def write_attribute_text(prefix, line)
      print prefix
      line.each do |achar|
        attr = achar.attr
        if (attr & (ITALIC+CODE)) != 0
          print "_", BS
        end
        if (attr & BOLD) != 0
          print achar.char, BS
        end
        print achar.char
      end
      puts
    end

# draw a string in bold
    def bold_print(text)
      text.split(//).each do |ch|
        print ch, BS, ch
      end
    end
  end

##################################################
  
  # This formatter uses ANSI escape sequences
  # to colorize stuff
  # works with pages such as man and less.

class AnsiFormatter < AttributeFormatter

def initialize(*args)
      print "\033[0m"
      super
    end

def write_attribute_text(prefix, line)
      print prefix
      curr_attr = 0
      line.each do |achar|
        attr = achar.attr
        if achar.attr != curr_attr
          update_attributes(achar.attr)
          curr_attr = achar.attr
        end
        print achar.char
      end
      update_attributes(0) unless curr_attr.zero?
      puts
    end

def bold_print(txt)
      print "\033[1m#{txt}\033[m"
    end

HEADINGS = {
      1 => [ "\033[1;32m", "\033[m" ] ,
      2 => ["\033[4;32m", "\033[m" ],
      3 => ["\033[32m", "\033[m" ]
    }

def display_heading(text, level, indent)
      level = 3 if level > 3
      heading = HEADINGS[level]
      print indent
      print heading[0]
      print strip_attributes(text)
      puts heading[1]
    end
    
    private

ATTR_MAP = {
      BOLD   => "1",
      ITALIC => "33",
      CODE   => "36"
    }

def update_attributes(attr)
 str = "\033["
 for quality in [ BOLD, ITALIC, CODE]
 unless (attr & quality).zero?
 str << ATTR_MAP[quality]
 end
 end
 print str, "m"
 end
 end

##################################################
  
  # This formatter uses HTML.

class HtmlFormatter < AttributeFormatter

def initialize(*args)
      super
    end

def write_attribute_text(prefix, line)
      curr_attr = 0
      line.each do |achar|
        attr = achar.attr
        if achar.attr != curr_attr
          update_attributes(curr_attr, achar.attr)
          curr_attr = achar.attr
        end
        print(escape(achar.char))
      end
      update_attributes(curr_attr, 0) unless curr_attr.zero?
    end

def draw_line(label=nil)
 if label != nil
 bold_print(label)
 end
 puts("<hr>")
 end

def bold_print(txt)
      tag("b") { txt }
    end

def blankline()
 puts("")
 end

def break_to_newline
 puts(" ")
 end

def display_heading(text, level, indent)
      level = 4 if level > 4
      tag("h#{level}") { text }
      puts
    end
    
    ######################################################################

def display_list(list)

case list.type
 when SM::ListBase::BULLET 
 list_type = "ul"
 prefixer = proc { |ignored| "<li>" }

when SM::ListBase::NUMBER,
 SM::ListBase::UPPERALPHA,
 SM::ListBase::LOWERALPHA
 list_type = "ol"
 prefixer = proc { |ignored| "<li>" }
 
 when SM::ListBase::LABELED
 list_type = "dl"
 prefixer = proc do |li|
 "<dt>" + escape(li.label) + "<dd>"
 end

when SM::ListBase::NOTE
 list_type = "table"
 prefixer = proc do |li|
 %{<tr valign="top"><td>#{li.label.gsub(/ /, '&nbsp;')}</td><td>}
 end
 else
 fail "unknown list type"
 end

print "<#{list_type}>"
 list.contents.each do |item|
 if item.kind_of? SM::Flow::LI
 prefix = prefixer.call(item)
 print prefix
 display_flow_item(item, prefix)
 else
 display_flow_item(item)
 end
 end
 print "</#{list_type}>"
 end

def display_verbatim_flow_item(item, prefix=@indent)
 print("<pre>")
 puts item.body
 puts("</pre>")
 end

private

ATTR_MAP = {
      BOLD   => "b>",
      ITALIC => "i>",
      CODE   => "tt>"
    }

def update_attributes(current, wanted)
 str = ""
 # first turn off unwanted ones
 off = current & ~wanted
 for quality in [ BOLD, ITALIC, CODE]
 if (off & quality) > 0
 str << "</" + ATTR_MAP[quality]
 end
 end

# now turn on wanted
 for quality in [ BOLD, ITALIC, CODE]
 unless (wanted & quality).zero?
 str << "<" << ATTR_MAP[quality]
 end
 end
 print str
 end

def tag(code)
 print("<#{code}>")
 print(yield)
 print("</#{code}>")
 end

def escape(str)
 str.
 gsub(/&/n, '&amp;').
 gsub(/\"/n, '&quot;').
 gsub(/>/n, '&gt;').
 gsub(/</n, '&lt;')
 end

end

##################################################
  
  # This formatter reduces extra lines for a simpler output.
  # It improves way output looks for tools like IRC bots.

class SimpleFormatter < TextFormatter

######################################################################

# No extra blank lines

def blankline
    end

######################################################################

# Display labels only, no lines

def draw_line(label=nil)
      unless label.nil? then
        bold_print(label) 
        puts
      end
    end

######################################################################

# Place heading level indicators inline with heading.

def display_heading(text, level, indent)
      text = strip_attributes(text)
      case level
      when 1
        puts "= " + text.upcase
      when 2
        puts "-- " + text
      else
        print indent, text, "\n"
      end
    end

end

# Finally, fill in the list of known formatters

class TextFormatter

FORMATTERS = {
      "ansi"   => AnsiFormatter,
      "bs"     => OverstrikeFormatter,
      "html"   => HtmlFormatter,
      "plain"  => TextFormatter,
      "simple" => SimpleFormatter,
    }
      
    def TextFormatter.list
      FORMATTERS.keys.sort.join(", ")
    end

def TextFormatter.for(name)
      FORMATTERS[name.downcase]
    end

end

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