Module: Prawn::Font::Wrapping

Included in:
Metrics
Defined in:
lib/prawn/font/wrapping.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#naive_wrap(string, line_width, font_size, options = {}) ⇒ Object

TODO: Replace with TeX optimal algorithm



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# File 'lib/prawn/font/wrapping.rb', line 14

def naive_wrap(string, line_width, font_size, options = {})
  accumulated_width = 0
  scan_pattern = options[:mode] == :character ? /./ : /\S+|\s+/                                    
  
  output = ""                
  string.lines.each do |line|         
    segments = line.scan(scan_pattern)
                                  
    segments.each do |segment|    
      segment_width = string_width(segment, font_size, 
        :kerning => options[:kerning]) 

      if (accumulated_width + segment_width).round > line_width.round
        output = "#{output.sub(/[ \t]*\n?(\n*)\z/, "\n\\1")}"
        
        if segment =~ /\s/           
          accumulated_width = 0
        else
          output << segment
          accumulated_width = segment_width
        end
      else                           
        output << segment
        accumulated_width += segment_width
      end
    end    
  end
  
  output
end