Class: HashReader

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(logger = nil, path) ⇒ HashReader

Returns a new instance of HashReader.



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# File 'lib/worlddb/readers/hash_reader.rb', line 6

def initialize( logger=nil, path )
  if logger.nil?
    @logger = Logger.new(STDOUT)
    @logger.level = Logger::INFO
  else
    @logger = logger
  end
  
  @path = path

  ## nb: assume/enfore utf-8 encoding (with or without BOM - byte order mark)
  ## - see worlddb/utils.rb
  
  text = File.read_utf8( @path )
 
  ### hack for syck yaml parser (e.g.ruby 1.9.2) (cannot handle !!null)
  ##   change it to !null to get plain nil
  ##   w/ both syck and psych/libyml

  text = text.gsub( '!!null', '!null' )
 
  ### hacks for yaml
  
  ### see yaml gotschas
  ##  - http://www.perlmonks.org/?node_id=738671
  ##  - 

  ## replace all tabs w/ two spaces and issue a warning
  ## nb: yaml does NOT support tabs see why here -> yaml.org/faq.html
  
  text = text.gsub( "\t" ) do |_|
    puts "*** warn: hash reader - found tab (\t) replacing w/ two spaces; yaml forbids tabs; see yaml.org/faq.html"
    '  '  # replace w/ two spaces
  end

  ## quote implicit boolean types on,no,n,y
  
  text = text.gsub( /\b(ON|On|on|NO|No|no|N|n|Y|y)\b/ ) do |value|
    puts "*** warn: hash reader - found implicit bool (#{$1}); adding quotes to turn into string; see yaml.org/refcard.html"
    "'#{$1}'"  # add quotes to turn it into a string (not bool e.g. true|false)
  end
  
  @hash = YAML.load( text )
end

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/worlddb/readers/hash_reader.rb', line 51

def logger
  @logger
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/worlddb/readers/hash_reader.rb', line 53

def each
  @hash.each do |key_wild, value_wild|
    # normalize
    # - key n value as string (not symbols, bool? int? array?)
    # - remove leading and trailing whitespace
    key   = key_wild.to_s.strip
    value = value_wild.to_s.strip
    
    puts ">>#{key}<< >>#{value}<<"
  
    yield( key, value )
  end
end