Contents

module Anyway
  # Parses environment variables and provides
  # method-like access
  class Env
    # Regexp to detect array values
    # Array value is a values that contains at least one comma
    # and doesn't start/end with quote
    ARRAY_RXP = /\A[^'"].*\s*,\s*.*[^'"]\z/

    def initialize
      @data = {}
      load
    end

    def reload
      clear
      load
      self
    end

    def clear
      @data.clear
      self
    end

    def method_missing(method_name, *args, &_block)
      method_name = method_name.to_s.gsub(/\_/, '')
      return @data[method_name] if args.empty? && @data.key?(method_name)
    end

    private

    def load
      ENV.each_pair do |key, val|
        if config_key?(key)
          mod, path = extract_module_path(key)
          set_by_path(get_hash(@data, mod), path, serialize_val(val))
        end
      end
    end

    def config_key?(key)
      key =~ /^[A-Z\d]+\_[A-Z\d\_]+/
    end

    def extract_module_path(key)
      _, mod, path = key.split(/^([^\_]+)/)
      path.sub!(/^[\_]+/, '')
      [mod.downcase, path.downcase]
    end

    def set_by_path(to, path, val)
      parts = path.split("__")

      to = get_hash(to, parts.shift) while parts.length > 1

      to[parts.first] = val
    end

    def get_hash(from, name)
      (from[name] ||= {})
    end

    def serialize_val(value)
      case value
      when ARRAY_RXP
        value.split(/\s*,\s*/).map(&method(:serialize_val))
      when /\A(true|t|yes|y)\z/i
        true
      when /\A(false|f|no|n)\z/i
        false
      when /\A(nil|null)\z/i
        nil
      when /\A\d+\z/
        value.to_i
      when /\A\d*\.\d+\z/
        value.to_f
      when /\A['"].*['"]\z/
        value.gsub(/(\A['"]|['"]\z)/, '')
      else
        value
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
anyway_config-0.5.1	lib/anyway/env.rb