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ðŸ“ ..
ðŸ“„ English.rb(5.59 KB)
ðŸ“„ abbrev.rb(2.57 KB)
ðŸ“„ base64.rb(2.63 KB)
ðŸ“„ benchmark.rb(18 KB)
ðŸ“ cgi
ðŸ“„ cgi.rb(9.3 KB)
ðŸ“„ cmath.rb(7.22 KB)
ðŸ“„ complex.rb(380 B)
ðŸ“„ csv.rb(82.66 KB)
ðŸ“ date
ðŸ“„ date.rb(946 B)
ðŸ“„ debug.rb(23.23 KB)
ðŸ“„ delegate.rb(9.74 KB)
ðŸ“ digest
ðŸ“„ digest.rb(2.24 KB)
ðŸ“ dl
ðŸ“„ dl.rb(176 B)
ðŸ“ drb
ðŸ“„ drb.rb(19 B)
ðŸ“„ e2mmap.rb(3.8 KB)
ðŸ“„ erb.rb(25.72 KB)
ðŸ“„ expect.rb(1.33 KB)
ðŸ“ fiddle
ðŸ“„ fiddle.rb(928 B)
ðŸ“„ fileutils.rb(45.32 KB)
ðŸ“„ find.rb(2.03 KB)
ðŸ“„ forwardable.rb(7.64 KB)
ðŸ“„ getoptlong.rb(15.38 KB)
ðŸ“„ gserver.rb(8.83 KB)
ðŸ“„ ipaddr.rb(24.92 KB)
ðŸ“ irb
ðŸ“„ irb.rb(8.34 KB)
ðŸ“ json
ðŸ“„ json.rb(1.74 KB)
ðŸ“„ kconv.rb(5.74 KB)
ðŸ“„ logger.rb(20.85 KB)
ðŸ“„ mathn.rb(6.52 KB)
ðŸ“ matrix
ðŸ“„ matrix.rb(47.65 KB)
ðŸ“„ mkmf.rb(68.9 KB)
ðŸ“„ monitor.rb(6.94 KB)
ðŸ“„ mutex_m.rb(1.61 KB)
ðŸ“ net
ðŸ“„ observer.rb(5.69 KB)
ðŸ“„ open-uri.rb(25.84 KB)
ðŸ“„ open3.rb(20.64 KB)
ðŸ“ openssl
ðŸ“„ openssl.rb(547 B)
ðŸ“ optparse
ðŸ“„ optparse.rb(51.13 KB)
ðŸ“„ ostruct.rb(6.49 KB)
ðŸ“„ pathname.rb(14.21 KB)
ðŸ“„ pp.rb(13.31 KB)
ðŸ“„ prettyprint.rb(9.63 KB)
ðŸ“„ prime.rb(13.98 KB)
ðŸ“„ profile.rb(205 B)
ðŸ“„ profiler.rb(1.59 KB)
ðŸ“„ pstore.rb(15.81 KB)
ðŸ“ psych
ðŸ“„ psych.rb(9.82 KB)
ðŸ“ racc
ðŸ“ rake
ðŸ“„ rake.rb(2.02 KB)
ðŸ“„ rational.rb(308 B)
ðŸ“ rbconfig
ðŸ“ rdoc
ðŸ“„ rdoc.rb(4.29 KB)
ðŸ“„ resolv-replace.rb(1.74 KB)
ðŸ“„ resolv.rb(59.91 KB)
ðŸ“ rexml
ðŸ“ rinda
ðŸ“ ripper
ðŸ“„ ripper.rb(91 B)
ðŸ“ rss
ðŸ“„ rss.rb(2.84 KB)
ðŸ“ rubygems
ðŸ“„ rubygems.rb(34.13 KB)
ðŸ“„ scanf.rb(23.53 KB)
ðŸ“„ securerandom.rb(8.46 KB)
ðŸ“„ set.rb(29.91 KB)
ðŸ“ shell
ðŸ“„ shell.rb(5.9 KB)
ðŸ“„ shellwords.rb(3.88 KB)
ðŸ“„ singleton.rb(4.02 KB)
ðŸ“„ socket.rb(23.22 KB)
ðŸ“ syck
ðŸ“„ syck.rb(13.91 KB)
ðŸ“„ sync.rb(6.87 KB)
ðŸ“„ tempfile.rb(10.42 KB)
ðŸ“ test
ðŸ“„ thread.rb(6.59 KB)
ðŸ“„ thwait.rb(3.38 KB)
ðŸ“„ time.rb(17.03 KB)
ðŸ“„ timeout.rb(3.26 KB)
ðŸ“„ tmpdir.rb(3.72 KB)
ðŸ“„ tracer.rb(6.63 KB)
ðŸ“„ tsort.rb(6.79 KB)
ðŸ“„ ubygems.rb(268 B)
ðŸ“„ un.rb(8.32 KB)
ðŸ“ uri
ðŸ“„ uri.rb(3.07 KB)
ðŸ“„ weakref.rb(2.29 KB)
ðŸ“ webrick
ðŸ“„ webrick.rb(6.8 KB)
ðŸ“ x86_64-linux
ðŸ“ xmlrpc
ðŸ“ yaml
ðŸ“„ yaml.rb(2.58 KB)

Editing: prettyprint.rb

# This class implements a pretty printing algorithm. It finds line breaks and
# nice indentations for grouped structure.
#
# By default, the class assumes that primitive elements are strings and each
# byte in the strings have single column in width. But it can be used for
# other situations by giving suitable arguments for some methods:
# * newline object and space generation block for PrettyPrint.new
# * optional width argument for PrettyPrint#text
# * PrettyPrint#breakable
#
# There are several candidate uses:
# * text formatting using proportional fonts
# * multibyte characters which has columns different to number of bytes
# * non-string formatting
#
# == Bugs
# * Box based formatting?
# * Other (better) model/algorithm?
#
# == References
# Christian Lindig, Strictly Pretty, March 2000,
# http://www.st.cs.uni-sb.de/~lindig/papers/#pretty
#
# Philip Wadler, A prettier printer, March 1998,
# http://homepages.inf.ed.ac.uk/wadler/topics/language-design.html#prettier
#
# == Author
# Tanaka Akira <akr@m17n.org>
#
class PrettyPrint

# This is a convenience method which is same as follows:
  #
  #   begin
  #     q = PrettyPrint.new(output, maxwidth, newline, &genspace)
  #     ...
  #     q.flush
  #     output
  #   end
  #
  def PrettyPrint.format(output='', maxwidth=79, newline="\n", genspace=lambda {|n| ' ' * n})
    q = PrettyPrint.new(output, maxwidth, newline, &genspace)
    yield q
    q.flush
    output
  end

# This is similar to PrettyPrint::format but the result has no breaks.
  #
  # +maxwidth+, +newline+ and +genspace+ are ignored.
  #
  # The invocation of +breakable+ in the block doesn't break a line and is
  # treated as just an invocation of +text+.
  #
  def PrettyPrint.singleline_format(output='', maxwidth=nil, newline=nil, genspace=nil)
    q = SingleLine.new(output)
    yield q
    output
  end

# Creates a buffer for pretty printing.
  #
  # +output+ is an output target. If it is not specified, '' is assumed. It
  # should have a << method which accepts the first argument +obj+ of
  # PrettyPrint#text, the first argument +sep+ of PrettyPrint#breakable, the
  # first argument +newline+ of PrettyPrint.new, and the result of a given
  # block for PrettyPrint.new.
  #
  # +maxwidth+ specifies maximum line length. If it is not specified, 79 is
  # assumed. However actual outputs may overflow +maxwidth+ if long
  # non-breakable texts are provided.
  #
  # +newline+ is used for line breaks. "\n" is used if it is not specified.
  #
  # The block is used to generate spaces. {|width| ' ' * width} is used if it
  # is not given.
  #
  def initialize(output='', maxwidth=79, newline="\n", &genspace)
    @output = output
    @maxwidth = maxwidth
    @newline = newline
    @genspace = genspace || lambda {|n| ' ' * n}

@output_width = 0
    @buffer_width = 0
    @buffer = []

root_group = Group.new(0)
    @group_stack = [root_group]
    @group_queue = GroupQueue.new(root_group)
    @indent = 0
  end
  attr_reader :output, :maxwidth, :newline, :genspace
  attr_reader :indent, :group_queue

# Returns the group most recently added to the stack.
  def current_group
    @group_stack.last
  end

# first? is a predicate to test the call is a first call to first? with
  # current group.
  #
  # It is useful to format comma separated values as:
  #
  #   q.group(1, '[', ']') {
  #     xxx.each {|yyy|
  #       unless q.first?
  #         q.text ','
  #         q.breakable
  #       end
  #       ... pretty printing yyy ...
  #     }
  #   }
  #
  # first? is obsoleted in 1.8.2.
  #
  def first?
    warn "PrettyPrint#first? is obsoleted at 1.8.2."
    current_group.first?
  end

# Breaks the buffer into lines that are shorter than #maxwidth
  def break_outmost_groups
    while @maxwidth < @output_width + @buffer_width
      return unless group = @group_queue.deq
      until group.breakables.empty?
        data = @buffer.shift
        @output_width = data.output(@output, @output_width)
        @buffer_width -= data.width
      end
      while !@buffer.empty? && Text === @buffer.first
        text = @buffer.shift
        @output_width = text.output(@output, @output_width)
        @buffer_width -= text.width
      end
    end
  end

# This adds +obj+ as a text of +width+ columns in width.
  #
  # If +width+ is not specified, obj.length is used.
  #
  def text(obj, width=obj.length)
    if @buffer.empty?
      @output << obj
      @output_width += width
    else
      text = @buffer.last
      unless Text === text
        text = Text.new
        @buffer << text
      end
      text.add(obj, width)
      @buffer_width += width
      break_outmost_groups
    end
  end

# This is similar to #breakable except
  # the decision to break or not is determined individually.
  #
  # Two #fill_breakable under a group may cause 4 results:
  # (break,break), (break,non-break), (non-break,break), (non-break,non-break).
  # This is different to #breakable because two #breakable under a group
  # may cause 2 results:
  # (break,break), (non-break,non-break).
  #
  # The text sep+ is inserted if a line is not broken at this point.
  #
  # If +sep+ is not specified, " " is used.
  #
  # If +width+ is not specified, +sep.length+ is used. You will have to
  # specify this when +sep+ is a multibyte character, for example.
  #
  def fill_breakable(sep=' ', width=sep.length)
    group { breakable sep, width }
  end

# This says "you can break a line here if necessary", and a +width+\-column
  # text +sep+ is inserted if a line is not broken at the point.
  #
  # If +sep+ is not specified, " " is used.
  #
  # If +width+ is not specified, +sep.length+ is used. You will have to
  # specify this when +sep+ is a multibyte character, for example.
  #
  def breakable(sep=' ', width=sep.length)
    group = @group_stack.last
    if group.break?
      flush
      @output << @newline
      @output << @genspace.call(@indent)
      @output_width = @indent
      @buffer_width = 0
    else
      @buffer << Breakable.new(sep, width, self)
      @buffer_width += width
      break_outmost_groups
    end
  end

# Groups line break hints added in the block. The line break hints are all
  # to be used or not.
  #
  # If +indent+ is specified, the method call is regarded as nested by
  # nest(indent) { ... }.
  #
  # If +open_obj+ is specified, <tt>text open_obj, open_width</tt> is called
  # before grouping. If +close_obj+ is specified, <tt>text close_obj,
  # close_width</tt> is called after grouping.
  #
  def group(indent=0, open_obj='', close_obj='', open_width=open_obj.length, close_width=close_obj.length)
    text open_obj, open_width
    group_sub {
      nest(indent) {
        yield
      }
    }
    text close_obj, close_width
  end

def group_sub
    group = Group.new(@group_stack.last.depth + 1)
    @group_stack.push group
    @group_queue.enq group
    begin
      yield
    ensure
      @group_stack.pop
      if group.breakables.empty?
        @group_queue.delete group
      end
    end
  end

# Increases left margin after newline with +indent+ for line breaks added in
  # the block.
  #
  def nest(indent)
    @indent += indent
    begin
      yield
    ensure
      @indent -= indent
    end
  end

# outputs buffered data.
  #
  def flush
    @buffer.each {|data|
      @output_width = data.output(@output, @output_width)
    }
    @buffer.clear
    @buffer_width = 0
  end

class Text
    def initialize
      @objs = []
      @width = 0
    end
    attr_reader :width

def output(out, output_width)
      @objs.each {|obj| out << obj}
      output_width + @width
    end

def add(obj, width)
      @objs << obj
      @width += width
    end
  end

class Breakable
    def initialize(sep, width, q)
      @obj = sep
      @width = width
      @pp = q
      @indent = q.indent
      @group = q.current_group
      @group.breakables.push self
    end
    attr_reader :obj, :width, :indent

def output(out, output_width)
      @group.breakables.shift
      if @group.break?
        out << @pp.newline
        out << @pp.genspace.call(@indent)
        @indent
      else
        @pp.group_queue.delete @group if @group.breakables.empty?
        out << @obj
        output_width + @width
      end
    end
  end

class Group
    def initialize(depth)
      @depth = depth
      @breakables = []
      @break = false
    end
    attr_reader :depth, :breakables

def break
      @break = true
    end

def break?
      @break
    end

def first?
      if defined? @first
        false
      else
        @first = false
        true
      end
    end
  end

class GroupQueue
    def initialize(*groups)
      @queue = []
      groups.each {|g| enq g}
    end

def enq(group)
      depth = group.depth
      @queue << [] until depth < @queue.length
      @queue[depth] << group
    end

def deq
      @queue.each {|gs|
        (gs.length-1).downto(0) {|i|
          unless gs[i].breakables.empty?
            group = gs.slice!(i, 1).first
            group.break
            return group
          end
        }
        gs.each {|group| group.break}
        gs.clear
      }
      return nil
    end

def delete(group)
      @queue[group.depth].delete(group)
    end
  end

class SingleLine
    def initialize(output, maxwidth=nil, newline=nil)
      @output = output
      @first = [true]
    end

def text(obj, width=nil)
      @output << obj
    end

def breakable(sep=' ', width=nil)
      @output << sep
    end

def nest(indent)
      yield
    end

def group(indent=nil, open_obj='', close_obj='', open_width=nil, close_width=nil)
      @first.push true
      @output << open_obj
      yield
      @output << close_obj
      @first.pop
    end

def flush
    end

def first?
      result = @first[-1]
      @first[-1] = false
      result
    end
  end
end

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Editing: prettyprint.rb

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