class KeyValueParser

# File lib/key_value_parser.rb, line 3
def initialize defaults={}, options={}
  @defaults = defaults
  @options = {
    separator: /\s*[=:]\s*/,
    normalize_keys: true,
    typecast_values: true,
    array_values: true
  }.merge(options)
end

# File lib/key_value_parser.rb, line 13
def parse kvs
  @defaults.merge(
    Hash[
      kvs.map do |a| 
        k, *v = a.split(@options[:separator], @options[:array_values] ? 0 : 2)
        if v.size==1
          v = v[0]
        elsif v.size==0
          v = nil
        end
        [
          @options[:normalize_keys] ? normalize_key(k) : k, 
          @options[:typecast_values] ? typecast(v) : v
        ]
      end
    ]
  )
end

# File lib/key_value_parser.rb, line 34
def normalize_key k
  k.sub(/^--/,'').gsub(/[\s\-]+/, '_').to_sym
end

# File lib/key_value_parser.rb, line 38
def typecast v
  if v.is_a? Array
    return v.map{|item| typecast(item)}
  end
  if v=='true' or v.nil?
    v = true
  elsif v=='false'
    v = false
  elsif v=~/^-?\d*\.\d+$/
    v = v.to_f
  elsif v=~/^-?\d+$/
    v = v.to_i
  else
    v
  end
end