Class: KPeg::Multiple

Inherits:

Operator

• Object
• Operator
• KPeg::Multiple

show all

Defined in:

lib/kpeg/grammar.rb

Instance Attribute Summary (collapse)

• - (Object) max readonly

  Returns the value of attribute max.

• - (Object) min readonly

  Returns the value of attribute min.

• - (Object) op readonly

  Returns the value of attribute op.

• - (Object) save_values readonly

  Returns the value of attribute save_values.

Attributes inherited from Operator

#action

Instance Method Summary (collapse)

• - (Object) ==(obj)
• - (Multiple) initialize(op, min, max) constructor

  A new instance of Multiple.

• - (Object) inspect
• - (Object) match(x)
• - (Object) save_values!

Methods inherited from Operator

#detect_tags, #inspect_type, #prune_values, #set_action, #|

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# File 'lib/kpeg/grammar.rb', line 238

def initialize(op, min, max)
  super()
  @op = op
  @min = min
  @max = max
  @save_values = nil
end

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# File 'lib/kpeg/grammar.rb', line 246

def max
  @max
end

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# File 'lib/kpeg/grammar.rb', line 246

def min
  @min
end

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# File 'lib/kpeg/grammar.rb', line 246

def op
  @op
end

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# File 'lib/kpeg/grammar.rb', line 246

def save_values
  @save_values
end

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# File 'lib/kpeg/grammar.rb', line 281

def ==(obj)
  case obj
  when Multiple
    @op == obj.op and @min == obj.min and @max == obj.max
  else
    super
  end
end

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# File 'lib/kpeg/grammar.rb', line 290

def inspect
  inspect_type "multi", "#{@min} #{@max ? @max : "*"} #{@op.inspect}"
end

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# File 'lib/kpeg/grammar.rb', line 252

def match(x)
  n = 0
  matches = []

  start = x.pos

  while true
    if m = @op.match(x)
      matches << m
    else
      break
    end

    n += 1

    if @max and n > @max
      x.pos = start
      return nil
    end
  end

  if n >= @min
    return MatchComposition.new(self, matches)
  end

  x.pos = start
  return nil
end

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# File 'lib/kpeg/grammar.rb', line 248

def save_values!
  @save_values = true
end