class Journey::Path::Pattern

# File lib/journey/path/pattern.rb, line 6
def initialize strexp
  parser = Journey::Parser.new

  @anchored = true

  case strexp
  when String
    @spec         = parser.parse strexp
    @requirements = {}
    @separators   = "/.?"
  when Router::Strexp
    @spec         = parser.parse strexp.path
    @requirements = strexp.requirements
    @separators   = strexp.separators.join
    @anchored     = strexp.anchor
  else
    raise "wtf bro: #{strexp}"
  end

  @names          = nil
  @optional_names = nil
  @required_names = nil
  @re             = nil
  @offsets        = nil
end

# File lib/journey/path/pattern.rb, line 32
def ast
  @spec.grep(Nodes::Symbol).each do |node|
    re = @requirements[node.to_sym]
    node.regexp = re if re
  end

  @spec.grep(Nodes::Star).each do |node|
    node = node.left
    node.regexp = @requirements[node.to_sym] || /(.+)/
  end

  @spec
end

# File lib/journey/path/pattern.rb, line 166
def match other
  return unless match = to_regexp.match(other)
  MatchData.new names, offsets, match
end

# File lib/journey/path/pattern.rb, line 46
def names
  @names ||= spec.grep(Nodes::Symbol).map { |n| n.name }
end

# File lib/journey/path/pattern.rb, line 54
def optional_names
  @optional_names ||= spec.grep(Nodes::Group).map { |group|
    group.grep(Nodes::Symbol)
  }.flatten.map { |n| n.name }.uniq
end

# File lib/journey/path/pattern.rb, line 50
def required_names
  @required_names ||= names - optional_names
end

# File lib/journey/path/pattern.rb, line 172
def source
  to_regexp.source
end

# File lib/journey/path/pattern.rb, line 176
def to_regexp
  @re ||= regexp_visitor.new(@separators, @requirements).accept spec
end