Class: TDParser::IterationParser

Inherits:
CompositeParser show all
Defined in:
lib/tdp.rb

Instance Attribute Summary collapse

Attributes inherited from CompositeParser

#parsers

Instance Method Summary collapse

Methods inherited from CompositeParser

#optimize, #same?

Methods inherited from Parser

#%, #*, #+, #-, #/, #>, #>>, #do, #optimize, #parse, #peek, #same?, #to_proc, #|, #~@

Methods included from TDParser

#any_rule, #backref, #chainl, #chainr, #condition_rule, define, #empty_rule, #fail_rule, #leftrec, #none_rule, #rightrec, #rule, #stackref, #state, #token

Methods included from BufferUtils

#prepare, #recover

Constructor Details

#initialize(parser, n, range) ⇒ IterationParser

Returns a new instance of IterationParser.



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# File 'lib/tdp.rb', line 512

def initialize(parser, n, range)
  @min = n
  @range = range
  super(parser)
end

Instance Attribute Details

#min ⇒ Object (readonly)

Returns the value of attribute min.



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# File 'lib/tdp.rb', line 511

def min
  @min
end

#range ⇒ Object (readonly)

Returns the value of attribute range.



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# File 'lib/tdp.rb', line 511

def range
  @range
end

Instance Method Details

#==(r) ⇒ Object 



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# File 'lib/tdp.rb', line 574

def ==(r)
  super(r) &&
  (@min == r.min) &&
  (@range == r.range)
end

#call(ts, buff) ⇒ Object 



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# File 'lib/tdp.rb', line 518

def call(ts, buff)
  r = @parsers[0]
  n = @min
  x  = true
  xs = []
  while( n > 0 )
    n -= 1
    b = prepare(buff)
    if( (x = r.call(ts, b)).nil? )
      recover(b, ts)
      break
    else
      buff.insert(0, *b)
      xs.push(x)
    end
  end
  if ( x.nil? )
    nil
  else
    if( range )
      range.each{
        while( true )
          y = x
          b = prepare(buff)
          if( (x = r.call(ts, b)).nil? )
            recover(b, ts)
            x = y
            break
          else
            buff.insert(0, *b)
            xs.push(x)
          end
        end
      }
    else
      while( true )
        y = x
        b = prepare(buff)
        if( (x = r.call(ts, b)).nil? )
          recover(b, ts)
          x = y
          break
        else
          buff.insert(0, *b)
          xs.push(x)
        end
      end
    end
    Sequence[xs]
  end
end

#to_s ⇒ Object 



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# File 'lib/tdp.rb', line 570

def to_s()
  "(#{@parsers[0].to_s()})*#{@range ? @range.to_s : @min.to_s}"
end