Module: Swak::Table

Defined in:
lib/swak/table.rb

Defined Under Namespace

Classes: SmartRow

Class Method Summary collapse

Class Method Details

.column(table, col) ⇒ Object 



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# File 'lib/swak/table.rb', line 143

def Table.column(table, col)
  table.map {|row| row[col]}
end

.read(io_or_fn, opts = {:has_header => false, :type => String, :delim => "\t", :smart => false}) ⇒ Object 



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# File 'lib/swak/table.rb', line 42

def Table.read(io_or_fn, opts={:has_header => false, :type => String, :delim => "\t", :smart => false})
  if io_or_fn.is_a?(String)
    io = File.new(io_or_fn)
  else
    io = io_or_fn
  end

  table = []
  delim = opts[:delim] || "\t"

  if opts[:has_header] || opts[:smart]
    header = io.gets.chomp 
    opts[:header] = header
    header_as_fields = header.split(delim)
    if header_as_fields.size > 0 && header_as_fields[0][0] == '#'
      header_as_fields[0][0] = ""
    end
  end

  case opts[:type].to_s
  when "Integer"
    ele_proc = Proc.new{|ele| ele.to_i_strict}
  when "Float"
    ele_proc = Proc.new{|ele| ele.to_f_strict}
  else
    ele_proc = Proc.new{|ele| ele} # By default, don't format
  end

  if opts[:smart]
    row_proc = Proc.new{|row| SmartRow.new(header_as_fields, row) }
  else
    row_proc = Proc.new{|row| row}
  end

  for line in io
    line.chomp!
    f = line.split(delim)
    table << row_proc.call(f.map(&ele_proc))
  end

  return table
end

.transpose(table) ⇒ Object 



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# File 'lib/swak/table.rb', line 115

def Table.transpose(table)
  raise "Error in Swak::Table.transpose(): Cannot transpose nil table" if table.nil?
  raise "Error in Swak::Table.transpose(): Cannot transpose a SmartRow table (yet)" if table.size > 0 && table[0].is_a?(SmartRow)
  return [] if table.size == 0

  num_rows = table.size
  num_cols = table[0].size

  out_mat = Array.new(num_cols)

  for row in table
    raise "Error in Swak::Table.transpose(): Doesn't support jagged table" if row.size != num_cols
  end

  c = 0
  while c < num_cols
    out_mat[c] = Array.new(num_rows)
    r = 0
    while r < num_rows
      out_mat[c][r] = table[r][c]
      r += 1
    end
    c += 1
  end

  return out_mat
end

.write(table, io_or_fn, opts = {:header => nil, :fmt => nil, :delim => "\t"}) ⇒ Object 



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# File 'lib/swak/table.rb', line 85

def Table.write(table, io_or_fn, opts={:header => nil, :fmt => nil, :delim => "\t"})
  raise "Illegal fmt in Swak::Table.write: #{opts.inspect}" if !opts[:fmt].nil? && !opts[:fmt].is_a?(String)

  delim = opts[:delim] || "\t"

  header = opts[:header]
  header = header.join(delim) if header.is_a?(Array) && header.size > 0

  if io_or_fn.is_a?(String)
    io = File.new(io_or_fn, "w")
  else
    io = io_or_fn
  end

  io.puts header if !header.nil?

  if opts[:fmt]
    fmt = opts[:fmt]
    for row in table
      io.puts row.map{|str| fmt % str }.join(delim)
    end
  else
    for row in table
      io.puts row.join(delim)
    end
  end

  io.close if io_or_fn.is_a?(String)
end