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erl_to_ruby.rb
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erl_to_ruby.rb
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require 'pp'
CLOSE_STRS = {"["=>"]", "{"=>"}", '"'=>'"', "'"=>"'", '<<'=>'>>', "#Ref<"=>">", "<"=>">"}
def pos_close_str(str, open_str)
close_str = CLOSE_STRS[open_str]
if open_str == close_str
return str.index(close_str,1)
else
open_count = 1
for i in ((str.index(open_str)+1)..(str.length))
opened = (str[i,open_str.length ] == open_str)
open_count += 1 if opened
closed = (str[i,close_str.length] == close_str)
open_count -= 1 if closed
return i if (closed && open_count==0)
end
raise "Parse error, not found matching close of #{open_str} in #{str}"
end
end
def erl_term(str)
str.strip!
term_open_str = str[/^(\[|\{|\"|\'|<<|#Ref|<)/,1]
if term_open_str.nil? # integer,float, or, atom
matches = /^(([-0-9\.]+)|([a-z][a-z0-9_]*))/.match(str)
term = case
when (matches[2] && str[/\./]) then str.to_f
when matches[2] then str.to_i
when matches[3] then str.to_sym
end
else
term_close_str = CLOSE_STRS[term_open_str]
re_ends_with_close_str = Regexp.new(Regexp.escape("#{term_close_str}")+"$")
raise "Parse error, Invalid erlang term #{str}" unless re_ends_with_close_str.match(str)
term = case term_open_str
when '[' then ErlList.new(str)
when '{' then ErlTuple.new(str)
when '"' then ErlString.new(str)
when "'" then ErlAtom.new(str)
when "<<" then ErlBinary.new(str)
when "#Ref" then ErlRef.new(str)
when "<" then ErlPid.new(str)
else raise "Parse error with #{term_open_str}"
end
end
term
end
def parse_first_term(str_to_parse)
open_str = str_to_parse[/^(\[|\{|\"|\'|<<|#Ref|<)/,1]
if open_str
close_str = CLOSE_STRS[open_str]
pos_open_str = str_to_parse.index(open_str)
pos_close_str = pos_close_str(str_to_parse,open_str)
term_str = str_to_parse[pos_open_str..(pos_close_str+close_str.length-1)]
new_str_to_parse = str_to_parse[(pos_close_str+close_str.length), str.length]
else
pos_open_str = 0
pos_close_str = str_to_parse.index(",") || str_to_parse.length
term_str = str_to_parse[pos_open_str..(pos_close_str-1)]
new_str_to_parse = str_to_parse[pos_close_str+1, str.length]
end
new_str_to_parse = "" if new_str_to_parse.nil?
[term_str, new_str_to_parse.gsub(/^[,\s]+/,"")]
end
class ErlTerm
attr_accessor :str
def initialize(str)
@str = str
end
end
class ErlEnumeration
attr_accessor :str, :elements
def initialize(str)
@str = str
@elements = []
end
def parse
strs = get_element_strs
@elements = parse_element_strs(strs)
end
#parse @str to elements to the end of @str, and each elements must be separated by ","
def get_element_strs
element_strs=[]
str_to_parse = @str[1,@str.length-2].strip # between [ and ], or { and }
until str_to_parse == ""
term_str, new_str_to_parse = parse_first_term(str_to_parse)
element_strs << term_str
str_to_parse = new_str_to_parse
end
element_strs
end
def parse_element_strs(strs)
strs.map {|term_str|
term = erl_term(term_str)
if term.is_a?(ErlTuple) or term.is_a?(ErlList)
term_strs = term.get_element_strs
term.elements = term.parse_element_strs(term_strs)
end
term
}
end
end
class ErlAtom < ErlTerm
def to_ruby
self.str.gsub(/'/,"")
end
end
class ErlBinary < ErlTerm
def to_ruby
self.str.gsub!(/[<>]/,"")
bin_els = self.str.split(",")
els = bin_els.map { |el|
if el[/^[0-9]+$/]
el.to_i
elsif el[/^"/]
el.gsub(/"/,"")
end
}
els.length > 1 ? els : els[0]
end
end
class ErlPid < ErlTerm
def to_ruby
self.str.gsub!(/<>/,"")
bin_els = self.str.split(".")
end
end
class ErlRef < ErlTerm
def to_ruby
self.str.gsub!(/#Ref<|>/,"")
bin_els = self.str.split(".")
end
end
class ErlString < ErlTerm
def to_ruby
self.str.gsub(/"/,"")
end
end
class ErlList < ErlEnumeration
def to_ruby
@elements.map {|el|
(el.is_a?(ErlTerm) || el.is_a?(ErlEnumeration))? el.to_ruby : el
}
end
end
class ErlTuple < ErlEnumeration
def to_ruby
arr = @elements.map {|el|
(el.is_a?(ErlTerm) || el.is_a?(ErlEnumeration))? el.to_ruby : el
}
key = arr.delete_at(0)
hash = {key => ( arr.length>1 ? arr: arr[0])}
end
end
def erl_to_ruby(str)
str.gsub!(/[\n\r]/,"")
erl_obj = erl_term(str)
erl_obj.parse if erl_obj.is_a?(ErlEnumeration)
erl_obj.to_ruby
end
#
#example
#
#pp erl_to_ruby("[{a,[{a_foo,'ABCDE',\"ABCDE\",<<\"ABCDE\">>},{a_bar,1,2,3}]},{b,[{b_foo,1,2,3},{b_bar,1,2,3}]}]")
#pp erl_to_ruby(" {a,[{a_foo,'ABCDE',\"ABCDE\",<<\"ABCDE\">>}]} ")
#pp erl_to_ruby(" <<12,13,14,15,16,17,18,\"abcdefg\">> ")
#pp erl_to_ruby("{true,<<\"o_e-13885-2\">>,expiry, {63487411200,63519123599,[{offer,9434},{offer_url,none}]}}")
#pp erl_to_ruby( "[{sub,<<\"JCT\">>}, {sub2,none}]")