Class: KPeg::Operator

Inherits:

Object

• Object
• KPeg::Operator

show all

Defined in:

lib/kpeg/grammar.rb

Instance Attribute Summary (collapse)

• - (Object) action

  Returns the value of attribute action.

Instance Method Summary (collapse)

• - (Object) detect_tags(ops)
• - (Operator) initialize constructor

  A new instance of Operator.

• - (Object) inspect_type(tag, body)
• - (Object) prune_values(values)
• - (Object) set_action(act)
• - (Object) |(other)

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# File 'lib/kpeg/grammar.rb', line 17

def initialize
  @action = nil
  @has_tags = false
end

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# File 'lib/kpeg/grammar.rb', line 22

def action
  @action
end

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# File 'lib/kpeg/grammar.rb', line 28

def detect_tags(ops)
  tags = []
  ops.each_with_index do |r,idx|
    if r.kind_of?(Tag)
      @has_tags = true
      tags << idx
    end
  end

  @tags = tags if @has_tags
end

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# File 'lib/kpeg/grammar.rb', line 45

def inspect_type(tag, body)
  "#<#{tag} #{body}>"
end

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# File 'lib/kpeg/grammar.rb', line 40

def prune_values(values)
  return values unless @has_tags
  return values.values_at(*@tags)
end

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# File 'lib/kpeg/grammar.rb', line 24

def set_action(act)
  @action = act
end

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# File 'lib/kpeg/grammar.rb', line 49

def |(other)
  Choice.new(self, Grammar.resolve(other))
end