How to reset parser status?

[hiroyuki-sato]

Hello

I would like to parse multiple JSON string. I referenced JSON::Stream::Builder class.
And I create reset_state method for parse multiple JSON string in JSON::Stream::Parser class.

Do you have any idea to reset status?

Best regards.

---

Hiroyuki Sato.

  module Stream
    class Parser
      def reset_state
        @state = :start_document
      end
    end
  end
end

reset status in Builder class

  def end_document
    #....
    @parser.reset_state
    #....
  end

complete code is below.

require 'json/stream'
require 'pp'


class Builder
  METHODS = %w[start_document end_document start_object end_object start_array end_array key value]

  attr_reader :result

  def initialize(parser)
    @parser = parser
    METHODS.each do |name|
      parser.send(name, &method(name))
    end
    @callbacks = []
  end

  def register_callback(&block)
    @callbacks.push block
  end

  def start_document
    @stack = []
    @keys = []
    @result = nil
  end

  def end_document
    @result = @stack.pop
    @callbacks.each{ |c| c.call @result }
    @parser.reset_state
    @result
  end

  def start_object
    @stack.push({})
  end

  def end_object
    return if @stack.size == 1

    node = @stack.pop
    top = @stack[-1]

    case top
    when Hash
      top[@keys.pop] = node
    when Array
      top << node
    end
  end
  alias :end_array :end_object

  def start_array
    @stack.push([])
  end

  def key(key)
    @keys << key
  end

  def value(value)
    top = @stack[-1]
    case top
    when Hash
      top[@keys.pop] = value
    when Array
      top << value
    else
      @stack << value
    end
  end
end

module JSON
  module Stream
    class Parser
      def reset_state
        @state = :start_document
      end
    end
  end
end


parser = JSON::Stream::Parser.new
builder = Builder.new(parser)

builder.register_callback do |object|
  puts '-----'
  pp object
end

TEST=<<-EOS
{"test":[1,2,3]}
{"test":[1,2,3]}
EOS

TEST2=<<-EOS
{"test":[1,2,3]
EOS

TEST3='}'
parser << TEST
parser << TEST2
parser << TEST3

[dgraham]

The Parser class is designed to parse a single document right now. The reset_state method you added needs to perform the same steps as the constructor.