Class: KPeg::Rule

Inherits:

Object

• Object
• KPeg::Rule

show all

Defined in:

lib/vendor/kpeg/lib/kpeg.rb

Instance Attribute Summary (collapse)

• - (Object) action

  Returns the value of attribute action.

• - (Object) name

  Returns the value of attribute name.

Instance Method Summary (collapse)

• - (Object) detect_tags(rules)
• - (Rule) initialize constructor

  A new instance of Rule.

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

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# File 'lib/vendor/kpeg/lib/kpeg.rb', line 257

def initialize
  @name = nil
  @action = nil
  @has_tags = false
end

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# File 'lib/vendor/kpeg/lib/kpeg.rb', line 263

def action
  @action
end

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# File 'lib/vendor/kpeg/lib/kpeg.rb', line 263

def name
  @name
end

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# File 'lib/vendor/kpeg/lib/kpeg.rb', line 269

def detect_tags(rules)
  tags = []
  rules.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/vendor/kpeg/lib/kpeg.rb', line 286

def inspect_type(tag, body)
  return "#<#{tag} #{body}>" unless @name
  "#<#{tag}:#{@name} #{body}>"
end

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

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

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# File 'lib/vendor/kpeg/lib/kpeg.rb', line 265

def set_action(act)
  @action = act
end

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# File 'lib/vendor/kpeg/lib/kpeg.rb', line 291

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