Convert Ruby data to formatted Lua code

to_lua.rb

# Convert Ruby data to formatted Lua code
# irb(main):001:0> load 'to_lua.rb'; puts ToLua.format(['what', "she's", nil, false, true, ['yep'], [], {}, {foo: 'foo'}, {'bar' => 'bar'}, {0 => 'zero'}])
# {'what', 'she\'s', nil, false, true, {'yep'}, {}, {}, {foo = 'foo'}, {['bar'] = 'bar'}, {[0] = 'zero'}}
module ToLua
  extend self

  # Format value
  def format(v)
    if v.kind_of?(Array)
      format_array(v)
    elsif v.kind_of?(Hash)
      format_hash(v)
    else
      format_scalar(v)
    end
  end

  def format_array(a)
    '{' + a.map { |v| format(v) }.join(', ') + '}'
  end

  def format_hash(h)
    '{' + h.map { |k, v| format_key(k) + ' = ' + format(v) }.join(', ') + '}'
  end

  def format_scalar(s)
    if s == nil
      "nil"
    elsif s.kind_of?(Fixnum) || s.kind_of?(Float) || s.kind_of?(Symbol) || s == false || s == true
      s.to_s
    else
      format_string(s)
    end
  end

  def format_string(s)
    "'" + s.to_s.gsub(/([\\'])/, '\\\\\1') + "'"
  end

  def format_key(k)
    if k.kind_of?(Symbol)
      k.to_s
    else
      '[' + format_scalar(k) + ']'
    end
  end
end

Agh, sorry. Key value tables aren't delimited with :. The syntax is

local t = {key = 123, key2 = 1234}
t.key -- will return 123

For string keys, you'd do

local t = {['key'] = 123, ['key2'] = 1234}
t['key'] -- will return 123

In this case, I think string keys might be the safest bet.

Ah, interesting. Will adjust...