Class: Multiline::String

Inherits:
Object
  • Object
show all
Defined in:
lib/multiline/string.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str = "", buf_row = nil) ⇒ String

Returns a new instance of String.



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# File 'lib/multiline/string.rb', line 4

def initialize(str = "", buf_row = nil)
  @buf = str.split(/\n/)
  @row = [@buf.length, buf_row].compact.max rescue binding.irb
  @col = @buf.map{|line| Unicode::DisplayWidth.of(line,
                                                  Multiline.config.display_width_ambiguous,
                                                  Multiline.config.display_width_overwrite) }.max || 0
  @buf = @buf.map{|line| line + " " * (@col - Unicode::DisplayWidth.of(line,
                                                                       Multiline.config.display_width_ambiguous,
                                                                       Multiline.config.display_width_overwrite)) }
end

Instance Attribute Details

#buf ⇒ Object (readonly)

Returns the value of attribute buf.



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# File 'lib/multiline/string.rb', line 3

def buf
  @buf
end

#col ⇒ Object (readonly)

Returns the value of attribute col.



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# File 'lib/multiline/string.rb', line 3

def col
  @col
end

#row ⇒ Object (readonly)

Returns the value of attribute row.



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# File 'lib/multiline/string.rb', line 3

def row
  @row
end

Instance Method Details

#+(other) ⇒ Object 



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# File 'lib/multiline/string.rb', line 15

def +(other)
  buf = Multiline::String.new
  buf.concat(self, other)
  buf
end

#concat(*arguments, align: :center) ⇒ Object 



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# File 'lib/multiline/string.rb', line 21

def concat(*arguments, align: :center)
  arguments.each do |arg|
    org_col = @col
    org_row = @row
    @col += arg.col
    @row = [@row, arg.row].max

    case arg
    when ::String
    when ::Multiline::String
      case align
      when :top
        start_row = 0
        end_row = arg.row
      when :center
        start_row = (@row - arg.row) / 2
        end_row = (@row + arg.row) / 2
      when :bottom
        start_row = @row - arg.row
        end_row = @row
      end

      for index in 0...row do
        buf[index] ||= " " * org_col
        line = buf[index]
        if index >= start_row && index < end_row
          line.concat(arg.buf[index - start_row])
        else
          line.concat(' ' * arg.col)
        end
      end
    else
      raise ArgumentError, "Invalid string"
    end
  end
  self.to_s
end

#to_s ⇒ Object 



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# File 'lib/multiline/string.rb', line 59

def to_s
  @buf.join("\n") + "\n"
end