require 'json'

def parse_geoff_node(expr)
  GeoffNodeMatcher.new(expr)
end

def parse_geoff_relation(expr)
  GeoffRelationshipMatcher.new(expr)
end

def strip_whitespace s
  s.gsub(/^\s*/, '').chomp
end

class GeoffNodeMatcher

  @@regex = /\((\w+)\) (.*)/

  def initialize(expression)
    @@regex.match expression

    @node_name = $1
    @attributes = JSON.parse($2, symbolize_names: true)
  rescue
    @attributes = {}
  end

  def named?(name)
    @node_name == name
  end

  def has_attribute?(name, value)
    @attributes[name.to_sym] == value
  end
end

class GeoffRelationshipMatcher
  @@regex = /\((.*)\)-\[\:(.*)\]->\((.*)\)/

  def initialize(expression)
    @@regex.match expression

    @source_name = $1
    @relationship_name = $2
    @dest_name = $3
  end

  def named?(name)
    @relationship_name == name
  end
end