Class: ABNF::Compiler::Rule::Repetition

Inherits:
Object
  • Object
show all
Includes:
ABNF::Compiler::Rule
Defined in:
lib/abnf/compiler/rule/repetition.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ABNF::Compiler::Rule

#parse?

Constructor Details

#initialize(range, element) ⇒ Repetition

Returns a new instance of Repetition.



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# File 'lib/abnf/compiler/rule/repetition.rb', line 10

def initialize range, element
  @element = element
  @range = range
end

Instance Attribute Details

#element ⇒ Object (readonly)

Returns the value of attribute element.



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# File 'lib/abnf/compiler/rule/repetition.rb', line 7

def element
  @element
end

#range ⇒ Object (readonly)

Returns the value of attribute range.



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# File 'lib/abnf/compiler/rule/repetition.rb', line 8

def range
  @range
end

Instance Method Details

#maximum ⇒ Object 



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# File 'lib/abnf/compiler/rule/repetition.rb', line 15

def maximum
  range.last
end

#minimum ⇒ Object 



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# File 'lib/abnf/compiler/rule/repetition.rb', line 19

def minimum
  range.first
end

#parse(stream) ⇒ Object 



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# File 'lib/abnf/compiler/rule/repetition.rb', line 23

def parse stream
  matches = false
  nodes = []

  stream.branch do
    until nodes.size == maximum
      node = element.parse stream
      break unless node
      nodes << node
    end
    matches = true if nodes.size >= minimum
  end

  AST.repetition *nodes if matches
end