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# Copyright (c) 2004-2008 David Heinemeier Hansson
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

require 'yaml'
require 'strscan'

module HTTParty
  module Parsers #:nodoc:
    module JSON #:nodoc:
      class ParseError < StandardError #:nodoc:
      end

      def self.decode(json)
        YAML.load(convert_json_to_yaml(json))
      rescue ArgumentError => e
        raise ParseError, "Invalid JSON string"
      end

      protected
        # matches YAML-formatted dates
        DATE_REGEX = /^\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[ \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?$/

        # Ensure that ":" and "," are always followed by a space
        def self.convert_json_to_yaml(json) #:nodoc:
          scanner, quoting, marks, pos, times = StringScanner.new(json), false, [], nil, []
          while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
            case char = scanner[1]
            when '"', "'"
              if !quoting
                quoting = char
                pos = scanner.pos
              elsif quoting == char
                if json[pos..scanner.pos-2] =~ DATE_REGEX
                  # found a date, track the exact positions of the quotes so we can remove them later.
                  # oh, and increment them for each current mark, each one is an extra padded space that bumps
                  # the position in the final YAML output
                  total_marks = marks.size
                  times << pos+total_marks << scanner.pos+total_marks
                end
                quoting = false
              end
            when ":",","
              marks << scanner.pos - 1 unless quoting
            end
          end

          if marks.empty?
            json.gsub(/\\\//, '/')
          else
            left_pos = [-1].push(*marks)
            right_pos = marks << json.length
            output = []
            left_pos.each_with_index do |left, i|
              output << json[left.succ..right_pos[i]]
            end
            output = output * " "

            times.each { |i| output[i-1] = ' ' }
            output.gsub!(/\\\//, '/')
            output
          end
        end
    end
  end
end
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