Class: Packcr::Node::AlternateNode

Inherits:
Packcr::Node show all
Defined in:
lib/packcr/node/alternate_node.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Packcr::Node

#seq, #setup_rule

Constructor Details

#initialize(*nodes) ⇒ AlternateNode

Returns a new instance of AlternateNode.



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# File 'lib/packcr/node/alternate_node.rb', line 6

def initialize(*nodes)
  super()
  self.nodes = nodes
end

Instance Attribute Details

#nodes ⇒ Object

Returns the value of attribute nodes.



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# File 'lib/packcr/node/alternate_node.rb', line 4

def nodes
  @nodes
end

Instance Method Details

#alt(node) ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 11

def alt(node)
  @nodes << node
  self
end

#debug_dump(indent = 0) ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 16

def debug_dump(indent = 0)
  $stdout.print "#{" " * indent}Alternate(max:#{max}, len:#{nodes.length}) {\n"
  nodes.each do |node|
    node.debug_dump(indent + 2)
  end
  $stdout.print "#{" " * indent}}\n"
end

#generate_code(gen, onfail, indent, bare) ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 30

def generate_code(gen, onfail, indent, bare)
  b = false
  m = gen.next_label

  reach = nil
  gen.write Packcr.template("node/alternate.#{gen.lang}.erb", binding, indent: indent - 4, unwrap: bare)

  reach || Packcr::CODE_REACH__ALWAYS_FAIL
end

#link_references(ctx) ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 69

def link_references(ctx)
  nodes.each do |node|
    node.link_references(ctx)
  end
end

#max ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 24

def max
  m = 1
  m <<= 1 while m < @nodes.length
  m
end

#verify_captures(ctx, capts) ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 57

def verify_captures(ctx, capts)
  m = capts.length
  v = capts.dup
  nodes.each do |node|
    v = v[0, m]
    node.verify_captures(ctx, v)
    v[m...-1].each do |added_node|
      capts.push(added_node)
    end
  end
end

#verify_variables(vars) ⇒ Object 



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# File 'lib/packcr/node/alternate_node.rb', line 40

def verify_variables(vars)
  m = vars.length
  v = vars.dup
  nodes.each do |node|
    v = v[0, m]
    node.verify_variables(v)
    v[m...-1].each do |added_node|
      found = vars[m...-1].any? do |added_var|
        added_node.index == added_var.index
      end
      if !found
        vars.push(added_node)
      end
    end
  end
end