Module: ITRANS

Defined in:
lib/lyrics/utils/itrans.rb

Constant Summary collapse

@@itrans_dir = 
File.dirname( File.expand_path(__FILE__) ) + "/../itrans"
@@null_dev = 
"/dev/null"
@@devanagari2itrans = 
{
  ITRANS.unicode( 0x0901 ) => "",
  # vowels:
  ITRANS.unicode( 0x0905 ) => "a",
  ITRANS.unicode( 0x0906 ) => "aa", # /A
  ITRANS.unicode( 0x093E ) => "aa", # /A
  ITRANS.unicode( 0x0907 ) => "i",
  ITRANS.unicode( 0x093F ) => "i",
  ITRANS.unicode( 0x0908 ) => "ii", # /I
  ITRANS.unicode( 0x0940 ) => "ii", # /I
  ITRANS.unicode( 0x0909 ) => "u",
  ITRANS.unicode( 0x0941 ) => "u",
  ITRANS.unicode( 0x090A ) => "uu", # /U
  ITRANS.unicode( 0x0942 ) => "uu", # /U
  ITRANS.unicode( 0x090B ) => "RRi", # R^i
  ITRANS.unicode( 0x0943 ) => "RRi", # R^i
  ITRANS.unicode( 0x090C ) => "LLi", # L^i
  ITRANS.unicode( 0x0944 ) => "LLi", # L^i
  ITRANS.unicode( 0x090F ) => "e",
  ITRANS.unicode( 0x0947 ) => "e",
  ITRANS.unicode( 0x0910 ) => "ai",
  ITRANS.unicode( 0x0948 ) => "ai",
  ITRANS.unicode( 0x0913 ) => "o",
  ITRANS.unicode( 0x094B ) => "o",
  ITRANS.unicode( 0x0914 ) => "au",
  ITRANS.unicode( 0x094C ) => "au",
  # itrans irregular
  "क्ष"=> "kSh", # x / kS
  "त्र"=> "tr",
  "ज्ञ"=> "j~n", # GY / dny
  "श्र"=> "shr",
}
@@devanagari2itrans_consonants = 
{
  # gutturals:
  ITRANS.unicode( 0x0915 ) => "k",
  ITRANS.unicode( 0x0916 ) => "kh",
#   ITRANS.unicode( 0x0916 ) => ".Nkh",
  ITRANS.unicode( 0x0917 ) => "g",
  ITRANS.unicode( 0x0918 ) => "gh",
  ITRANS.unicode( 0x0918 ) => "~N",
  # palatals:
  ITRANS.unicode( 0x091A ) => "ch",
  ITRANS.unicode( 0x091B ) => "Ch",
  ITRANS.unicode( 0x091C ) => "j",
  ITRANS.unicode( 0x091D ) => "jh",
  ITRANS.unicode( 0x091E ) => "~n", # JN
  # retroflexes:
  ITRANS.unicode( 0x091F ) => "T",
  ITRANS.unicode( 0x0920 ) => "Th",
  ITRANS.unicode( 0x0921 ) => "D",
  ITRANS.unicode( 0x0922 ) => "Dh",
#   ITRANS.unicode( 0x0922 ) => ".Dh", # Rh (valid?)
  ITRANS.unicode( 0x0923 ) => "N",
  # dentals:
  ITRANS.unicode( 0x0924 ) => "t",
  ITRANS.unicode( 0x0925 ) => "th",
  ITRANS.unicode( 0x0926 ) => "d",
  ITRANS.unicode( 0x0927 ) => "dh",
  ITRANS.unicode( 0x0928 ) => "n",
  # labials:
  ITRANS.unicode( 0x092A ) => "p",
  ITRANS.unicode( 0x092B ) => "ph",
  ITRANS.unicode( 0x092C ) => "b",
  ITRANS.unicode( 0x092D ) => "bh",
  ITRANS.unicode( 0x092E ) => "m",
  # semi-vowels:
  ITRANS.unicode( 0x092F ) => "y",
  ITRANS.unicode( 0x0930 ) => "r",
  ITRANS.unicode( 0x0932 ) => "l",
  ITRANS.unicode( 0x0935 ) => "v", # w
  # sibilants:
  ITRANS.unicode( 0x0936 ) => "sh",
  ITRANS.unicode( 0x0937 ) => "Sh", # shh
  ITRANS.unicode( 0x0938 ) => "s",
  # miscellaneous:
  ITRANS.unicode( 0x0939 ) => "h",
  ITRANS.unicode( 0x0902 ) => ".n", # M / .m
  ITRANS.unicode( 0x0903 ) => "H", # .h
  ITRANS.unicode( 0x0950 ) => "OM", # AUM
  # other consonants:
  "क़" => "q",
  ITRANS.unicode( 0x0958 ) => "q",
  "ख़" => "Kh",
  "ग़" => "G",
  "ज़" => "z",
  ITRANS.unicode( 0x095B ) => "z",
  "फ़" => "f",
  "ड़" => ".D", # R
  ITRANS.unicode( 0x095C ) => ".D", # R (valid?)
  "ढ़" => ".Dh", # Rh
}

Class Method Summary collapse

Class Method Details

.from_devanagari(text) ⇒ Object 



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# File 'lib/lyrics/utils/itrans.rb', line 58

def ITRANS.from_devanagari( text )
  return ITRANS.from_devanagari!( String.new( text ) )
end

.from_devanagari!(text) ⇒ Object 



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# File 'lib/lyrics/utils/itrans.rb', line 44

def ITRANS.from_devanagari!( text )
  @@devanagari2itrans.each() do |devana, itrans|
    text.gsub!( devana, itrans )
  end
  @@devanagari2itrans_consonants.each() do |devana, itrans|
    # is the only symbol in the 'word' --> add an 'a' at the end:
    text.gsub!( /(^|[ ""\.:;\(\[])#{devana}([,;:?!\)\]\s]|$)/, "\\1#{itrans}a\\2" )
    # is not followed by a vocal --> add an 'a' at the end:
    text.gsub!( /#{devana}([^aeiouAEIOU,;:?!\)\]\s])/, "#{itrans}a\\1" )
    text.gsub!( devana, itrans )
  end
  return text
end

.normalize(text) ⇒ Object 



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# File 'lib/lyrics/utils/itrans.rb', line 26

def ITRANS.normalize( text )
  return ITRANS.from_devanagari!( ITRANS.to_devanagari( text ) )
end

.to_devanagari(text) ⇒ Object 



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# File 'lib/lyrics/utils/itrans.rb', line 34

def ITRANS.to_devanagari( text )
  orig_pwd = Dir.pwd()
  Dir.chdir( @@itrans_dir )
  trans = `echo #{Strings.shell_quote( "#indianifm=udvng.ifm\n #indian\n#{text}\n#endindian" )} | #{@@itrans_dir}/itrans -U 2>#{@@null_dev}`
  Dir.chdir( orig_pwd )
  trans.gsub!( /%[^\n]*/, "" ) # TODO search line
  trans.strip!()
  return trans
end

.to_devanagari!(text) ⇒ Object 



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# File 'lib/lyrics/utils/itrans.rb', line 30

def ITRANS.to_devanagari!( text )
  text.replace( to_devanagari( text ) )
end

.unicode(codepoint) ⇒ Object 



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# File 'lib/lyrics/utils/itrans.rb', line 62

def ITRANS.unicode( codepoint )
  [codepoint].pack( "U*" )
end