Class: TorqueBox::VFS::GlobTranslator

Inherits:
Object
  • Object
show all
Defined in:
lib/torquebox/vfs/glob_translator.rb

Constant Summary collapse

ESCAPED_CHARS = 
[ '.', '?', '(', ')', '[', ']' ]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ GlobTranslator

Returns a new instance of GlobTranslator.



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# File 'lib/torquebox/vfs/glob_translator.rb', line 24

def initialize(input)
  @input      = input
  @cur        = 0
  @alternation_depth = 0
end

Class Method Details

.to_regexp(glob_str) ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 38

def self.to_regexp(glob_str)
  regexp_str = translate( glob_str )
  ##puts "regexp_str: #{regexp_str}"
  Regexp.new( regexp_str )
end

.translate(glob_str) ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 31

def self.translate(glob_str)
  translator = GlobTranslator.new( glob_str )
  regexp_str = translator.glob()
  # puts "#{glob_str} ==> #{regexp_str}"
  regexp_str
end

Instance Method Details

#alternation ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 108

def alternation()
  #puts "enter alternation()"
  @alternation_depth += 1
  
  result = '('
  
  match_empty = false
  
  consume('{')
  if ( la() == ',' )
    consume(',')
    match_empty = true
  end
  
  result += '(' + glob() +')' 
  
  while ( la() == ',' )
    consume(',')
    if ( la() == '}' )
      match_empty = true
      break
    end
    result += '|(' + glob() + ')'
  end
  
  if ( match_empty )
    result += '|'
  end
  result += ')'
  consume( '}' )
  @alternation_depth -= 1
  #puts "exit alternation()"
  result
end

#char ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 156

def char()
  #puts "enter char()"
  c = consume() 
  if ( c == '\\' )
    c = consume()
  end
  if ( ESCAPED_CHARS.include?( c  ) )
    c = '\\' + c
  end
  #puts "exit char() #{c}"
  c
end

#char_class ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 143

def char_class()
  consume( '[' )
  result = '['

  while( la() != ']' )
    result += consume();
  end

  consume( ']' )
  result += ']'
  result
end

#double_splat ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 86

def double_splat()
  #puts "enter double_splat()"
  if la(2) == '/'
  	# result = '([^.][^/]+/){0,}'
  	result = '([^/.][^/]*/)*'
  else
  	result = '([^/.][^/]*)'
  end
  consume('*')
  consume('*')
  consume('/') if ( la() == '/' )
  #puts "exit double_splat()"
  result
end

#glob ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 44

def glob()
  result = ''
  while ( ! complete? )
    c = la()
    case( c )
    when '*'
      result += splat()
    when '?'
      result += question()
    when '{'
      result += alternation()
    when '['
      result += char_class()
    else
      if ( la_is_char? )
        result += char();
      else
        break
      end
    end
  end
  result
end

#la_is_char? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/torquebox/vfs/glob_translator.rb', line 169

def la_is_char?()
  ( return true ) if ( @alternation_depth == 0 )
  case ( la() )
  when '}'
    return false
  when ','
    return false
  else
    return true
  end
end

#question ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 101

def question()
  #puts "enter question()"
  consume('?')
  #puts "exit question()"
  '[^/]'
end

#splat ⇒ Object 



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# File 'lib/torquebox/vfs/glob_translator.rb', line 68

def splat()
  #puts "enter splat()"
  if ( la(1) == '*' )
    result = double_splat()
  else
    if ( cur() == 0 || lb() == '/' )
      result = '((?<=/|^)[^.][^/]*)*'
      # result = '[^/.][^/]*'
    else
      result = '[^/]*'
    end
    
    consume('*')
  end
  #puts "exit splat()"
  result
end