Class: Tabularize

Inherits:
Object
  • Object
show all
Defined in:
lib/tabularize.rb,
lib/tabularize/version.rb

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  :align     => :left,
  :valign    => :top,
  :pad       => ' ',
  :pad_left  => 0,
  :pad_right => 0,

  :hborder   => '-',
  :vborder   => '|',
  :iborder   => '+',

  :unicode   => true,
  :ansi      => true,

  :ellipsis     => '>',
  :screen_width => nil,
}
DEFAULT_OPTIONS_GENERATOR = 
{
  :pad_left  => 1,
  :pad_right => 1,
}
VERSION = 
"0.2.5"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Tabularize

Returns a new instance of Tabularize.

Since:

  • 0.2.0



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# File 'lib/tabularize.rb', line 30

def initialize options = {}
  @rows    = []
  @seps    = Hash.new { |h, k| h[k] = 0 }
  @options = DEFAULT_OPTIONS.
             merge(DEFAULT_OPTIONS_GENERATOR).
             merge(options)
  @cache   = {}
end

Class Method Details

.analyze(data, options = {}) ⇒ Object

Determines maximum widths of cells and maximum heights of rows



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# File 'lib/tabularize.rb', line 157

def self.analyze data, options = {}
  unicode     = options[:unicode]
  ansi        = options[:ansi]
  max_widths  = (options[:max_widths] || []).dup
  max_heights = (options[:max_heights] || []).dup
  rows        = []

  data.each_with_index do |row, ridx|
    rows << row = [*row].map(&:to_s)

    row.each_with_index do |cell, idx|
      nlines = 0
      cell.lines do |c|
        max_widths[idx] = [ Tabularize.cell_width(c.chomp, unicode, ansi), max_widths[idx] || 0 ].max
        nlines += 1
      end
      max_heights[ridx] = [ nlines, max_heights[ridx] || 1 ].max
    end
  end

  num_cells = max_widths.length
  rows.each do |row|
    [num_cells - row.length, 0].max.times do
      row << ''
    end
  end

  {
    :rows        => rows,
    :max_widths  => max_widths,
    :max_heights => max_heights,
  }
end

.cell_width(str, unicode, ansi) ⇒ Fixnum

Returns the display width of a String

Parameters:

  • str (String) —

    Input String

  • unicode (Boolean) —

    Set to true when the given String can include CJK wide characters

  • ansi (Boolean) —

    Set to true When the given String can include ANSI codes

Returns:

  • (Fixnum) —

    Display width of the given String

Since:

  • 0.2.0



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# File 'lib/tabularize.rb', line 151

def self.cell_width str, unicode, ansi
  str = str.gsub(/\e\[\d*(?:;\d+)*m/, '') if ansi
  str.send(unicode ? :display_width : :length)
end

.it(table_data, options = {}) ⇒ Array

Formats two-dimensional tabular data. One-dimensional data (e.g. Array of Strings) is treated as tabular data of which each row has only one column.

Parameters:

  • table_data (Enumerable)
  • options (Hash) (defaults to: {}) —

    Formatting options.

Returns:

  • (Array) —

    Two-dimensional Array of formatted cells.

Raises:

  • (ArgumentError) 


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# File 'lib/tabularize.rb', line 197

def self.it table_data, options = {}
  raise ArgumentError.new("Not enumerable") unless 
      table_data.respond_to?(:each)

  options = DEFAULT_OPTIONS.merge(options)
  pad     = options[:pad].to_s
  padl    = options[:pad_left]
  padr    = options[:pad_right]
  align   = [*options[:align]]
  valign  = [*options[:valign]]
  unicode = options[:unicode]
  ansi    = options[:ansi]
  screenw = options[:screen_width]

  unless pad.length == 1
    raise ArgumentError.new("Invalid padding") 
  end
  unless padl.is_a?(Fixnum) && padl >= 0
    raise ArgumentError.new(":pad_left must be a non-negative integer")
  end
  unless padr.is_a?(Fixnum) && padr >= 0
    raise ArgumentError.new(":pad_right must be a non-negative integer")
  end
  unless align.all? { |a| [:left, :right, :center].include?(a) }
    raise ArgumentError.new("Invalid alignment")
  end
  unless valign.all? { |a| [:top, :bottom, :middle].include?(a) }
    raise ArgumentError.new("Invalid vertical alignment")
  end
  unless screenw.nil? || (screenw.is_a?(Fixnum) && screenw > 0)
    raise ArgumentError.new(":screen_width must be a positive integer")
  end

  # Analyze data
  ret = options[:analysis] || Tabularize.analyze(table_data, options)
  rows, max_widths, max_heights =
    [:rows, :max_widths, :max_heights].map { |k| ret[k] }

  ridx = -1
  rows.map { |row| 
    ridx += 1
    idx = -1
    max_height = max_heights[ridx]
    row.map { |cell|
      idx += 1
      lines = cell.to_s.lines.to_a
      offset =
        case valign[idx] || valign.last
        when :top
          0
        when :bottom
          max_height - lines.length
        when :middle
          (max_height - lines.length) / 2
        end

      (0...max_height).map { |ln|
        ln -= offset
        str = (ln >= 0 && lines[ln]) ? lines[ln].chomp : (pad * max_widths[idx])
        alen = 
          if ansi
            Tabularize.cell_width(str, false, false) -
              Tabularize.cell_width(str, false, true)
          else
            0
          end
        slen = str.length - alen

        w = max_widths[idx]
        w += str.length - str.display_width if unicode
        pad * padl + 
          case align[idx] || align.last
          when :left
            str.ljust(w + alen, pad)
          when :right
            str.rjust(w + alen, pad)
          when :center
            str.rjust((w - slen) / 2 + slen + alen, pad).ljust(w + alen, pad)
          end +
            pad * padr
      }.join($/)
    }
  }
end

Instance Method Details

#<<(row) ⇒ Object

Parameters:

  • row (Array)

Since:

  • 0.2.0



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# File 'lib/tabularize.rb', line 47

def << row
  @rows << row
  nil
end

#separator! ⇒ Object

Since:

  • 0.2.0



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# File 'lib/tabularize.rb', line 40

def separator!
  @seps[@rows.length] += 1
  nil
end

#to_s ⇒ String

Returns:

  • (String)

Since:

  • 0.2.0



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# File 'lib/tabularize.rb', line 54

def to_s
  return nil if @rows.empty?

  # Invalidate cache if needed
  num_cached_rows = @cache[:num_rows] || 0
  analysis = Tabularize.analyze(@rows[num_cached_rows..-1], @options.merge(@cache[:analysis] || {}))

  unless @cache.empty?
    cmw = @cache[:analysis][:max_widths]
    mw  = analysis[:max_widths]
    if mw.zip(cmw).any? { |pair| pair.first > (pair.last || 0) }
      @cache = {}
      num_cached_rows = 0
    else
      [@seps[@rows.length] - @cache[:last_seps], 0].max.times do
        @cache[:string_io].puts @cache[:separator]
      end
      @cache[:last_seps] = @seps[@rows.length]

      if num_cached_rows == @rows.length
        return @cache[:string_io].string + @cache[:separator]
      end
    end
  end
  
  rows = Tabularize.it(@rows[num_cached_rows..-1], @options.merge(analysis))

  h  = @options[:hborder]
  v  = @options[:vborder]
  i  = @options[:iborder]
  vl = @options[:vborder]
  il = @options[:iborder]
  u  = @options[:unicode]
  a  = @options[:ansi]
  sw = @options[:screen_width]
  el = Tabularize.cell_width(@options[:ellipsis], u, a)

  separator = @cache[:separator]
  col_count = @cache[:col_count]
  unless separator
    separator = ''
    rows[0].each_with_index do |c, idx|
      new_sep = separator + i + h * Tabularize.cell_width(c, u, a)

      if sw && Tabularize.cell_width(new_sep, u, a) > sw - el
        col_count = idx
        break
      else
        separator = new_sep
      end
    end
    separator += il
  end

  output = @cache[:string_io] || StringIO.new.tap { |io| io.puts separator }
  if col_count
    rows = rows.map { |line| line[0, col_count] }
    vl = il = @options[:ellipsis]
  end
  rows.each_with_index do |row, idx|
    row = row.map { |val| val.lines.to_a.map(&:chomp) }
    height = row[0] ? row[0].count : 1
    @seps[idx + num_cached_rows].times do
      output.puts separator
    end
    (0...height).each do |line|
      output.print v unless row.empty?
      output.puts row.map { |lines|
        lines[line] || @options[:pad] * Tabularize.cell_width(lines[0], u, a)
      }.join(v) + vl
    end
  end

  @seps[rows.length + num_cached_rows].times do
    output.puts separator
  end

  @cache = {
    :analysis  => analysis,
    :separator => separator,
    :col_count => col_count,
    :num_rows  => @rows.length,
    :string_io => output,
    :last_seps => @seps[rows.length]
  }
  output.string + separator
rescue Exception
  @cache = {}
  raise
end