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EDIT :: state.rb

# frozen_string_literal: true

module JSON
  module Ext
    module Generator
      class State
        # call-seq: new(opts = {})
        #
        # Instantiates a new State object, configured by _opts_.
        #
        # _opts_ can have the following keys:
        #
        # * *indent*: a string used to indent levels (default: ''),
        # * *space*: a string that is put after, a : or , delimiter (default: ''),
        # * *space_before*: a string that is put before a : pair delimiter (default: ''),
        # * *object_nl*: a string that is put at the end of a JSON object (default: ''),
        # * *array_nl*: a string that is put at the end of a JSON array (default: ''),
        # * *allow_nan*: true if NaN, Infinity, and -Infinity should be
        #   generated, otherwise an exception is thrown, if these values are
        #   encountered. This options defaults to false.
        # * *ascii_only*: true if only ASCII characters should be generated. This
        #   option defaults to false.
        # * *buffer_initial_length*: sets the initial length of the generator's
        #   internal buffer.
        def initialize(opts = nil)
          if opts && !opts.empty?
            configure(opts)
          end
        end

# call-seq: configure(opts)
        #
        # Configure this State instance with the Hash _opts_, and return
        # itself.
        def configure(opts)
          unless opts.is_a?(Hash)
            if opts.respond_to?(:to_hash)
              opts = opts.to_hash
            elsif opts.respond_to?(:to_h)
              opts = opts.to_h
            else
              raise TypeError, "can't convert #{opts.class} into Hash"
            end
          end
          _configure(opts)
        end

alias_method :merge, :configure

# call-seq:
        #   generate(obj) -> String
        #   generate(obj, anIO) -> anIO
        #
        # Generates a valid JSON document from object +obj+ and returns the
        # result. If no valid JSON document can be created this method raises a
        # GeneratorError exception.
        def generate(obj, io = nil)
          _generate(obj, io)
        end

# call-seq: to_h
        #
        # Returns the configuration instance variables as a hash, that can be
        # passed to the configure method.
        def to_h
          result = {
            indent: indent,
            space: space,
            space_before: space_before,
            object_nl: object_nl,
            array_nl: array_nl,
            allow_nan: allow_nan?,
            ascii_only: ascii_only?,
            max_nesting: max_nesting,
            script_safe: script_safe?,
            strict: strict?,
            depth: depth,
            buffer_initial_length: buffer_initial_length,
          }

instance_variables.each do |iv|
            iv = iv.to_s[1..-1]
            result[iv.to_sym] = self[iv]
          end

result
        end

alias_method :to_hash, :to_h

# call-seq: [](name)
        #
        # Returns the value returned by method +name+.
        def [](name)
          if respond_to?(name)
            __send__(name)
          else
            instance_variable_get("@#{name}") if
              instance_variables.include?("@#{name}".to_sym) # avoid warning
          end
        end

# call-seq: []=(name, value)
        #
        # Sets the attribute name to value.
        def []=(name, value)
          if respond_to?(name_writer = "#{name}=")
            __send__ name_writer, value
          else
            instance_variable_set "@#{name}", value
          end
        end
      end
    end
  end
end

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EDIT :: state.rb