Class: LineReader

Inherits:
Object
  • Object
show all
Includes:
LogUtils::Logging
Defined in:
lib/textutils/reader/line_reader.rb

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ LineReader

Returns a new instance of LineReader.



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# File 'lib/textutils/reader/line_reader.rb', line 48

def initialize( path )
  @path = path

  ## nb: assume/enfore utf-8 encoding (with or without BOM - byte order mark)
  ## - see textutils/utils.rb
  @data = File.read_utf8( @path )
end

Instance Method Details

#each_line ⇒ Object 



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# File 'lib/textutils/reader/line_reader.rb', line 56

def each_line
  @data.each_line do |line|

    # comments allow:
    # 1) #####  (shell/ruby style)
    # 2) --  comment here (haskel/?? style)
    # 3) % comment here (tex/latex style)

    if line =~ /^\s*#/ || line =~ /^\s*--/ || line =~ /^\s*%/
      # skip komments and do NOT copy to result (keep comments secret!)
      logger.debug 'skipping comment line'
      next
    end
      
    if line =~ /^\s*$/ 
      # kommentar oder leerzeile überspringen 
      logger.debug 'skipping blank line'
      next
    end

    # pass 1) remove possible trailing eol comment
    ##  e.g    -> nyc, New York   # Sample EOL Comment Here (with or without commas,,,,)
    ## becomes -> nyc, New York

    line = line.sub( /\s+#.+$/, '' )

    # pass 2) remove leading and trailing whitespace
    
    line = line.strip
 
    yield( line )
  end # each lines
end