class RBS::Substitution

Attributes

instance_type[RW]

mapping[R]

Public Class Methods

build(variables, types, instance_type: nil) { |t| ... } click to toggle source

# File rbs-1.4.0/lib/rbs/substitution.rb, line 18
def self.build(variables, types, instance_type: nil, &block)
  unless variables.size == types.size
    raise "Broken substitution: variables=#{variables}, types=#{types}"
  end

  mapping = variables.zip(types).to_h

  self.new.tap do |subst|
    mapping.each do |v, t|
      type = block_given? ? yield(t) : t
      subst.add(from: v, to: type)
    end

    subst.instance_type = instance_type
  end
end

new() click to toggle source

# File rbs-1.4.0/lib/rbs/substitution.rb, line 10
def initialize()
  @mapping = {}
end

Public Instance Methods

add(from:, to:) click to toggle source

# File rbs-1.4.0/lib/rbs/substitution.rb, line 14
def add(from:, to:)
  mapping[from] = to
end

apply(ty) click to toggle source

# File rbs-1.4.0/lib/rbs/substitution.rb, line 35
def apply(ty)
  case ty
  when Types::Variable
    # @type var ty: Types::Variable
    mapping[ty.name] || ty
  when Types::Bases::Instance
    if t = instance_type
      t
    else
      ty
    end
  else
    ty
  end
end

empty?() click to toggle source

# File rbs-1.4.0/lib/rbs/substitution.rb, line 6
def empty?
  mapping.empty? && instance_type.nil?
end

without(*vars) click to toggle source

# File rbs-1.4.0/lib/rbs/substitution.rb, line 51
def without(*vars)
  Substitution.new.tap do |subst|
    subst.mapping.merge!(mapping)
    vars.each do |var|
      subst.mapping.delete(var)
    end

    subst.instance_type = self.instance_type
  end
end