Class: Interscript::Node::Rule::Sub

Inherits:
Interscript::Node::Rule show all
Defined in:
lib/interscript/node/rule/sub.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(from, to, before: nil, not_before: nil, after: nil, not_after: nil, priority: nil, reverse_run: nil) ⇒ Sub

Returns a new instance of Sub.



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# File 'lib/interscript/node/rule/sub.rb', line 8

def initialize (from, to,
                before: nil, not_before: nil,
                after: nil, not_after: nil,
                priority: nil, reverse_run: nil)
  self.from = Interscript::Node::Item.try_convert from
  if to == :upcase
    self.to = :upcase
  elsif to == :downcase
    self.to = :downcase
  else
    self.to = Interscript::Node::Item.try_convert to
  end

  self.priority = priority

  #raise TypeError, "Can't supply both before and not_before" if before && not_before
  #raise TypeError, "Can't supply both after and not_after" if after && not_after

  self.reverse_run = reverse_run

  self.before = Interscript::Node::Item.try_convert(before) if before
  self.after = Interscript::Node::Item.try_convert(after) if after
  self.not_before = Interscript::Node::Item.try_convert(not_before) if not_before
  self.not_after = Interscript::Node::Item.try_convert(not_after) if not_after
end

Instance Attribute Details

#after ⇒ Object

Returns the value of attribute after.



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# File 'lib/interscript/node/rule/sub.rb', line 3

def after
  @after
end

#before ⇒ Object

Returns the value of attribute before.



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# File 'lib/interscript/node/rule/sub.rb', line 3

def before
  @before
end

#from ⇒ Object

Returns the value of attribute from.



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# File 'lib/interscript/node/rule/sub.rb', line 2

def from
  @from
end

#not_after ⇒ Object

Returns the value of attribute not_after.



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# File 'lib/interscript/node/rule/sub.rb', line 3

def not_after
  @not_after
end

#not_before ⇒ Object

Returns the value of attribute not_before.



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# File 'lib/interscript/node/rule/sub.rb', line 3

def not_before
  @not_before
end

#priority ⇒ Object

Returns the value of attribute priority.



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# File 'lib/interscript/node/rule/sub.rb', line 6

def priority
  @priority
end

#reverse_after ⇒ Object

Returns the value of attribute reverse_after.



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# File 'lib/interscript/node/rule/sub.rb', line 4

def reverse_after
  @reverse_after
end

#reverse_before ⇒ Object

Returns the value of attribute reverse_before.



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# File 'lib/interscript/node/rule/sub.rb', line 4

def reverse_before
  @reverse_before
end

#reverse_not_after ⇒ Object

Returns the value of attribute reverse_not_after.



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# File 'lib/interscript/node/rule/sub.rb', line 4

def reverse_not_after
  @reverse_not_after
end

#reverse_not_before ⇒ Object

Returns the value of attribute reverse_not_before.



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# File 'lib/interscript/node/rule/sub.rb', line 4

def reverse_not_before
  @reverse_not_before
end

#reverse_run ⇒ Object

Returns the value of attribute reverse_run.



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# File 'lib/interscript/node/rule/sub.rb', line 5

def reverse_run
  @reverse_run
end

#to ⇒ Object

Returns the value of attribute to.



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# File 'lib/interscript/node/rule/sub.rb', line 2

def to
  @to
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/interscript/node/rule/sub.rb', line 199

def ==(other)
  super &&
  self.from == other.from &&
  self.to == other.to &&
  self.before == other.before &&
  self.after == other.after &&
  self.not_before == other.not_before &&
  self.not_after == other.not_after &&
  self.priority == other.priority
end

#has_assertions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/interscript/node/rule/sub.rb', line 99

def has_assertions?
  !!(before || not_before || not_after || after)
end

#inspect ⇒ Object 



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# File 'lib/interscript/node/rule/sub.rb', line 210

def inspect
  out = "sub "
  params = []
  params << @from.inspect
  if Symbol === @to
    params << @to.to_s
  else
    params << @to.inspect
  end
  params << "reverse_run: #{@reverse_run.inspect}" unless @reverse_run.nil?

  params << "before: #{@before.inspect}" if @before
  params << "after: #{@after.inspect}" if @after
  params << "not_before: #{@not_before.inspect}" if @not_before
  params << "not_after: #{@not_after.inspect}" if @not_after

  params << "priority: #{@priority.inspect}" if @priority
  out << params.join(", ")
end

#max_length ⇒ Object 



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# File 'lib/interscript/node/rule/sub.rb', line 34

def max_length
  len = self.from.max_length
  len += self.before.max_length if self.before
  len += self.after.max_length if self.after
  len += self.not_before.max_length if self.not_before
  len += self.not_after.max_length if self.not_after
  len += self.priority if self.priority
  len
end

#reverse ⇒ Object 



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# File 'lib/interscript/node/rule/sub.rb', line 67

def reverse
  if to == :upcase
    xfrom = from.downcase
    xto = :downcase
  elsif to == :downcase
    xfrom = from.upcase
    xto = :upcase
  else
    xto, xfrom = reverse_transfer(from, to)
  end

  # A special case: sub "a", "" shouldn't be present in a reverse map
  rrun = self.reverse_run.nil? ? nil : !self.reverse_run
  if rrun.nil? && !has_assertions? &&
    (xfrom == "" ||
      (Interscript::Node::Item::String === xfrom && xfrom.data == '') ||
      (Interscript::Node::Item::Alias === xfrom && xfrom.name == :none)
    )

    rrun = true
  end

  Interscript::Node::Rule::Sub.new(xfrom, xto,
    before: before, after: after,
    not_before: not_before, not_after: not_after,

    reverse_run: rrun,

    priority: priority ? -priority : nil
  )
end

#reverse_transfer(from, to) ⇒ Object

Attempt to transfer some references to boundary/line_begin around. Those in general should go into before/after clauses, but for now let’s try to get the best compatibility possible. Also, CaptureGroup, CaptureRef need to be shifted around



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# File 'lib/interscript/node/rule/sub.rb', line 107

def reverse_transfer from, to
  # This part is about moving initial and final boundary like aliases
  case from
  when Interscript::Node::Item::Group
    first = from.children.first
    last = from.children.last

    if Interscript::Node::Item::Alias === first && first.boundary_like?
      out = Interscript::Node::Item::Group.new + first + to
      to = out.compact

      from = from.dup.tap do |i|
        i.children = i.children[1..-1]
      end.compact
    end

    if Interscript::Node::Item::Alias === last && last.boundary_like?
      out = Interscript::Node::Item::Group.new + to + last
      to = out.compact

      from = from.dup.tap do |i|
        i.children = i.children[0..-2]
      end.compact
    end
  when Interscript::Node::Item::Alias
    if from.boundary_like?
      to = if from.name.to_s.end_with? "_end"
        Interscript::Node::Item::Group.new + to + from
      else
        Interscript::Node::Item::Group.new + from + to
      end
      from = Interscript::Node::Item::Alias.new(:none)
    end
  end

  # This part is about moving backreferences
  state = {left:[], right:[]}

  from  = reverse_transfer_visit(from, :from, state)
  to    = reverse_transfer_visit(to,   :to,   state)

  [from, to]
end

#to_hash ⇒ Object 



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# File 'lib/interscript/node/rule/sub.rb', line 44

def to_hash
  puts self.from.inspect if $DEBUG
  puts params.inspect if $DEBUG
  hash = { :class => self.class.to_s,
    :from => self.from.to_hash,
    :to => Symbol === self.to ? self.to : self.to.to_hash,
    :reverse_run => self.reverse_run,
    :before => self.before&.to_hash,
    :not_before => self.not_before&.to_hash,
    :after => self.after&.to_hash,
    :not_after => self.not_after&.to_hash,
    :priority => self.priority
  }

  hash[:before] = self.before&.to_hash if self.before
  hash[:not_before] = self.not_before&.to_hash if self.not_before
  hash[:after] = self.after&.to_hash if self.after
  hash[:not_after] = self.not_after&.to_hash if self.not_after
  hash[:priority] = self.priority if self.priority

  hash
end