Class: ValuesReader

Inherits:
Object
  • Object
show all
Defined in:
lib/worlddb/readers/values_reader.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(logger, path, more_values = {}) ⇒ ValuesReader

Returns a new instance of ValuesReader.



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# File 'lib/worlddb/readers/values_reader.rb', line 5

def initialize( logger, path, more_values={} )
  ## todo: check - can we make logger=nil a default arg too?
  if logger.nil?
    @logger = Logger.new(STDOUT)
    @logger.level = Logger::INFO
  else
    @logger = logger
  end
  
  @path = path

  @more_values = more_values

  @data = File.read_utf8( @path )
end

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/worlddb/readers/values_reader.rb', line 21

def logger
  @logger
end

Instance Method Details

#each_line ⇒ Object 



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# File 'lib/worlddb/readers/values_reader.rb', line 23

def each_line
 
  @data.each_line do |line|

    if 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

    # remove leading and trailing whitespace
    line = line.strip

    puts "line: >>#{line}<<"

    values = line.split(',')
    
    # pass 1) remove leading and trailing whitespace for values

    values = values.map { |value| value.strip }

    # pass 2) remove comment columns
    
    values = values.select do |value|
      if value =~ /^#/  ## start with # treat it as a comment column; e.g. remove it
        puts "   removing column with value >>#{value}<<"
        false
      else
        true
      end
    end

    # pass 3) remove comments inside columns

    values = values.map do |value|
      value = value.sub( /\s+#.+$/, '' )
      value
    end
    
    
    puts "  values: >>#{values.join('<< >>')}<<"
          
    attribs = {
      key: values[0]
    }
    
    ## title (split of optional synonyms)
    # e.g. FC Bayern Muenchen|Bayern Muenchen|Bayern
    titles = values[1].split('|')
    
    attribs[ :title ]    =  titles[0]
    ## add optional synonyms
    attribs[ :synonyms ] =  titles[1..-1].join('|')  if titles.size > 1
    
    attribs = attribs.merge( @more_values )  # e.g. merge country_id and other defaults if present
                      
    yield( attribs, values[2..-1] )

  end # each lines

end