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Edit File : common.rb \| Size : 15.00 KB
#frozen_string_literal: false require 'json/version' require 'json/generic_object' module JSON class << self # If _object_ is string-like, parse the string and return the parsed # result as a Ruby data structure. Otherwise generate a JSON text from the # Ruby data structure object and return it. # # The _opts_ argument is passed through to generate/parse respectively. # See generate and parse for their documentation. def [](object, opts = {}) if object.respond_to? :to_str JSON.parse(object.to_str, opts) else JSON.generate(object, opts) end end # Returns the JSON parser class that is used by JSON. This is either # JSON::Ext::Parser or JSON::Pure::Parser. attr_reader :parser # Set the JSON parser class _parser_ to be used by JSON. def parser=(parser) # :nodoc: @parser = parser remove_const :Parser if const_defined?(:Parser, false) const_set :Parser, parser end # Return the constant located at _path_. The format of _path_ has to be # either ::A::B::C or A::B::C. In any case, A has to be located at the top # level (absolute namespace path?). If there doesn't exist a constant at # the given path, an ArgumentError is raised. def deep_const_get(path) # :nodoc: path.to_s.split(/::/).inject(Object) do \|p, c\| case when c.empty? then p when p.const_defined?(c, true) then p.const_get(c) else begin p.const_missing(c) rescue NameError => e raise ArgumentError, "can't get const #{path}: #{e}" end end end end # Set the module _generator_ to be used by JSON. def generator=(generator) # :nodoc: old, $VERBOSE = $VERBOSE, nil @generator = generator generator_methods = generator::GeneratorMethods for const in generator_methods.constants klass = deep_const_get(const) modul = generator_methods.const_get(const) klass.class_eval do instance_methods(false).each do \|m\| m.to_s == 'to_json' and remove_method m end include modul end end self.state = generator::State const_set :State, self.state const_set :SAFE_STATE_PROTOTYPE, State.new const_set :FAST_STATE_PROTOTYPE, State.new( :indent => '', :space => '', :object_nl => "", :array_nl => "", :max_nesting => false ) const_set :PRETTY_STATE_PROTOTYPE, State.new( :indent => ' ', :space => ' ', :object_nl => "\n", :array_nl => "\n" ) ensure $VERBOSE = old end # Returns the JSON generator module that is used by JSON. This is # either JSON::Ext::Generator or JSON::Pure::Generator. attr_reader :generator # Returns the JSON generator state class that is used by JSON. This is # either JSON::Ext::Generator::State or JSON::Pure::Generator::State. attr_accessor :state # This is create identifier, which is used to decide if the _json_create_ # hook of a class should be called. It defaults to 'json_class'. attr_accessor :create_id end self.create_id = 'json_class' NaN = 0.0/0 Infinity = 1.0/0 MinusInfinity = -Infinity # The base exception for JSON errors. class JSONError < StandardError def self.wrap(exception) obj = new("Wrapped(#{exception.class}): #{exception.message.inspect}") obj.set_backtrace exception.backtrace obj end end # This exception is raised if a parser error occurs. class ParserError < JSONError; end # This exception is raised if the nesting of parsed data structures is too # deep. class NestingError < ParserError; end # :stopdoc: class CircularDatastructure < NestingError; end # :startdoc: # This exception is raised if a generator or unparser error occurs. class GeneratorError < JSONError; end # For backwards compatibility UnparserError = GeneratorError # This exception is raised if the required unicode support is missing on the # system. Usually this means that the iconv library is not installed. class MissingUnicodeSupport < JSONError; end module_function # Parse the JSON document _source_ into a Ruby data structure and return it. # # _opts_ can have the following # keys: # * max_nesting: The maximum depth of nesting allowed in the parsed data # structures. Disable depth checking with :max_nesting => false. It # defaults to 100. # * allow_nan: If set to true, allow NaN, Infinity and -Infinity in # defiance of RFC 7159 to be parsed by the Parser. This option defaults # to false. # * symbolize_names: If set to true, returns symbols for the names # (keys) in a JSON object. Otherwise strings are returned. Strings are # the default. # * create_additions: If set to false, the Parser doesn't create # additions even if a matching class and create_id was found. This option # defaults to false. # * object_class: Defaults to Hash # * array_class: Defaults to Array def parse(source, opts = {}) Parser.new(source, *(opts\|\|{})).parse end # Parse the JSON document _source_ into a Ruby data structure and return it. # The bang version of the parse method defaults to the more dangerous values # for the _opts_ hash, so be sure only to parse trusted _source_ documents. # # _opts_ can have the following keys: # max_nesting: The maximum depth of nesting allowed in the parsed data # structures. Enable depth checking with :max_nesting => anInteger. The # parse! methods defaults to not doing max depth checking: This can be # dangerous if someone wants to fill up your stack. # * allow_nan: If set to true, allow NaN, Infinity, and -Infinity in # defiance of RFC 7159 to be parsed by the Parser. This option defaults # to true. # * create_additions: If set to false, the Parser doesn't create # additions even if a matching class and create_id was found. This option # defaults to false. def parse!(source, opts = {}) opts = { :max_nesting => false, :allow_nan => true }.merge(opts) Parser.new(source, *(opts\|\|{})).parse end # Generate a JSON document from the Ruby data structure _obj_ and return # it. _state_ is a JSON::State object, # * or a Hash like object (responding to to_hash), # * an object convertible into a hash by a to_h method, # that is used as or to configure a State object. # # It defaults to a state object, that creates the shortest possible JSON text # in one line, checks for circular data structures and doesn't allow NaN, # Infinity, and -Infinity. # # A _state_ hash 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. # * max_nesting: The maximum depth of nesting allowed in the data # structures from which JSON is to be generated. Disable depth checking # with :max_nesting => false, it defaults to 100. # # See also the fast_generate for the fastest creation method with the least # amount of sanity checks, and the pretty_generate method for some # defaults for pretty output. def generate(obj, opts = nil) if State === opts state, opts = opts, nil else state = SAFE_STATE_PROTOTYPE.dup end if opts 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 state = state.configure(opts) end state.generate(obj) end # :stopdoc: # I want to deprecate these later, so I'll first be silent about them, and # later delete them. alias unparse generate module_function :unparse # :startdoc: # Generate a JSON document from the Ruby data structure _obj_ and return it. # This method disables the checks for circles in Ruby objects. # # WARNING: Be careful not to pass any Ruby data structures with circles as # _obj_ argument because this will cause JSON to go into an infinite loop. def fast_generate(obj, opts = nil) if State === opts state, opts = opts, nil else state = FAST_STATE_PROTOTYPE.dup end if opts 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 state.configure(opts) end state.generate(obj) end # :stopdoc: # I want to deprecate these later, so I'll first be silent about them, and later delete them. alias fast_unparse fast_generate module_function :fast_unparse # :startdoc: # Generate a JSON document from the Ruby data structure _obj_ and return it. # The returned document is a prettier form of the document returned by # #unparse. # # The _opts_ argument can be used to configure the generator. See the # generate method for a more detailed explanation. def pretty_generate(obj, opts = nil) if State === opts state, opts = opts, nil else state = PRETTY_STATE_PROTOTYPE.dup end if opts 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 state.configure(opts) end state.generate(obj) end # :stopdoc: # I want to deprecate these later, so I'll first be silent about them, and later delete them. alias pretty_unparse pretty_generate module_function :pretty_unparse # :startdoc: class << self # The global default options for the JSON.load method: # :max_nesting: false # :allow_nan: true # :allow_blank: true attr_accessor :load_default_options end self.load_default_options = { :max_nesting => false, :allow_nan => true, :allow_blank => true, :create_additions => true, } # Load a ruby data structure from a JSON _source_ and return it. A source can # either be a string-like object, an IO-like object, or an object responding # to the read method. If _proc_ was given, it will be called with any nested # Ruby object as an argument recursively in depth first order. To modify the # default options pass in the optional _options_ argument as well. # # BEWARE: This method is meant to serialise data from trusted user input, # like from your own database server or clients under your control, it could # be dangerous to allow untrusted users to pass JSON sources into it. The # default options for the parser can be changed via the load_default_options # method. # # This method is part of the implementation of the load/dump interface of # Marshal and YAML. def load(source, proc = nil, options = {}) opts = load_default_options.merge options if source.respond_to? :to_str source = source.to_str elsif source.respond_to? :to_io source = source.to_io.read elsif source.respond_to?(:read) source = source.read end if opts[:allow_blank] && (source.nil? \|\| source.empty?) source = 'null' end result = parse(source, opts) recurse_proc(result, &proc) if proc result end # Recursively calls passed _Proc_ if the parsed data structure is an _Array_ or _Hash_ def recurse_proc(result, &proc) case result when Array result.each { \|x\| recurse_proc x, &proc } proc.call result when Hash result.each { \|x, y\| recurse_proc x, &proc; recurse_proc y, &proc } proc.call result else proc.call result end end alias restore load module_function :restore class << self # The global default options for the JSON.dump method: # :max_nesting: false # :allow_nan: true # :allow_blank: true attr_accessor :dump_default_options end self.dump_default_options = { :max_nesting => false, :allow_nan => true, } # Dumps _obj_ as a JSON string, i.e. calls generate on the object and returns # the result. # # If anIO (an IO-like object or an object that responds to the write method) # was given, the resulting JSON is written to it. # # If the number of nested arrays or objects exceeds _limit_, an ArgumentError # exception is raised. This argument is similar (but not exactly the # same!) to the _limit_ argument in Marshal.dump. # # The default options for the generator can be changed via the # dump_default_options method. # # This method is part of the implementation of the load/dump interface of # Marshal and YAML. def dump(obj, anIO = nil, limit = nil) if anIO and limit.nil? anIO = anIO.to_io if anIO.respond_to?(:to_io) unless anIO.respond_to?(:write) limit = anIO anIO = nil end end opts = JSON.dump_default_options opts = opts.merge(:max_nesting => limit) if limit result = generate(obj, opts) if anIO anIO.write result anIO else result end rescue JSON::NestingError raise ArgumentError, "exceed depth limit" end # Encodes string using Ruby's _String.encode_ def self.iconv(to, from, string) string.encode(to, from) end end module ::Kernel private # Outputs _objs_ to STDOUT as JSON strings in the shortest form, that is in # one line. def j(objs) objs.each do \|obj\| puts JSON::generate(obj, :allow_nan => true, :max_nesting => false) end nil end # Outputs _objs_ to STDOUT as JSON strings in a pretty format, with # indentation and over many lines. def jj(objs) objs.each do \|obj\| puts JSON::pretty_generate(obj, :allow_nan => true, :max_nesting => false) end nil end # If _object_ is string-like, parse the string and return the parsed result as # a Ruby data structure. Otherwise, generate a JSON text from the Ruby data # structure object and return it. # # The _opts_ argument is passed through to generate/parse respectively. See # generate and parse for their documentation. def JSON(object, *args) if object.respond_to? :to_str JSON.parse(object.to_str, args.first) else JSON.generate(object, args.first) end end end # Extends any Class to include _json_creatable?_ method. class ::Class # Returns true if this class can be used to create an instance # from a serialised JSON string. The class has to implement a class # method _json_create_ that expects a hash as first parameter. The hash # should include the required data. def json_creatable? respond_to?(:json_create) end end Back

Edit File : common.rb | Size : 15.00 KB

#frozen_string_literal: false
require 'json/version'
require 'json/generic_object'

module JSON
  class << self
    # If _object_ is string-like, parse the string and return the parsed
    # result as a Ruby data structure. Otherwise generate a JSON text from the
    # Ruby data structure object and return it.
    #
    # The _opts_ argument is passed through to generate/parse respectively.
    # See generate and parse for their documentation.
    def [](object, opts = {})
      if object.respond_to? :to_str
        JSON.parse(object.to_str, opts)
      else
        JSON.generate(object, opts)
      end
    end

# Returns the JSON parser class that is used by JSON. This is either
    # JSON::Ext::Parser or JSON::Pure::Parser.
    attr_reader :parser

# Set the JSON parser class _parser_ to be used by JSON.
    def parser=(parser) # :nodoc:
      @parser = parser
      remove_const :Parser if const_defined?(:Parser, false)
      const_set :Parser, parser
    end

# Return the constant located at _path_. The format of _path_ has to be
    # either ::A::B::C or A::B::C. In any case, A has to be located at the top
    # level (absolute namespace path?). If there doesn't exist a constant at
    # the given path, an ArgumentError is raised.
    def deep_const_get(path) # :nodoc:
      path.to_s.split(/::/).inject(Object) do |p, c|
        case
        when c.empty?                  then p
        when p.const_defined?(c, true) then p.const_get(c)
        else
          begin
            p.const_missing(c)
          rescue NameError => e
            raise ArgumentError, "can't get const #{path}: #{e}"
          end
        end
      end
    end

# Set the module _generator_ to be used by JSON.
    def generator=(generator) # :nodoc:
      old, $VERBOSE = $VERBOSE, nil
      @generator = generator
      generator_methods = generator::GeneratorMethods
      for const in generator_methods.constants
        klass = deep_const_get(const)
        modul = generator_methods.const_get(const)
        klass.class_eval do
          instance_methods(false).each do |m|
            m.to_s == 'to_json' and remove_method m
          end
          include modul
        end
      end
      self.state = generator::State
      const_set :State, self.state
      const_set :SAFE_STATE_PROTOTYPE, State.new
      const_set :FAST_STATE_PROTOTYPE, State.new(
        :indent         => '',
        :space          => '',
        :object_nl      => "",
        :array_nl       => "",
        :max_nesting    => false
      )
      const_set :PRETTY_STATE_PROTOTYPE, State.new(
        :indent         => '  ',
        :space          => ' ',
        :object_nl      => "\n",
        :array_nl       => "\n"
      )
    ensure
      $VERBOSE = old
    end

# Returns the JSON generator module that is used by JSON. This is
    # either JSON::Ext::Generator or JSON::Pure::Generator.
    attr_reader :generator

# Returns the JSON generator state class that is used by JSON. This is
    # either JSON::Ext::Generator::State or JSON::Pure::Generator::State.
    attr_accessor :state

# This is create identifier, which is used to decide if the _json_create_
    # hook of a class should be called. It defaults to 'json_class'.
    attr_accessor :create_id
  end
  self.create_id = 'json_class'

NaN           = 0.0/0

Infinity      = 1.0/0

MinusInfinity = -Infinity

# The base exception for JSON errors.
  class JSONError < StandardError
    def self.wrap(exception)
      obj = new("Wrapped(#{exception.class}): #{exception.message.inspect}")
      obj.set_backtrace exception.backtrace
      obj
    end
  end

# This exception is raised if a parser error occurs.
  class ParserError < JSONError; end

# This exception is raised if the nesting of parsed data structures is too
  # deep.
  class NestingError < ParserError; end

# :stopdoc:
  class CircularDatastructure < NestingError; end
  # :startdoc:

# This exception is raised if a generator or unparser error occurs.
  class GeneratorError < JSONError; end
  # For backwards compatibility
  UnparserError = GeneratorError

# This exception is raised if the required unicode support is missing on the
  # system. Usually this means that the iconv library is not installed.
  class MissingUnicodeSupport < JSONError; end

module_function

# Parse the JSON document _source_ into a Ruby data structure and return it.
  #
  # _opts_ can have the following
  # keys:
  # * *max_nesting*: The maximum depth of nesting allowed in the parsed data
  #   structures. Disable depth checking with :max_nesting => false. It
  #   defaults to 100.
  # * *allow_nan*: If set to true, allow NaN, Infinity and -Infinity in
  #   defiance of RFC 7159 to be parsed by the Parser. This option defaults
  #   to false.
  # * *symbolize_names*: If set to true, returns symbols for the names
  #   (keys) in a JSON object. Otherwise strings are returned. Strings are
  #   the default.
  # * *create_additions*: If set to false, the Parser doesn't create
  #   additions even if a matching class and create_id was found. This option
  #   defaults to false.
  # * *object_class*: Defaults to Hash
  # * *array_class*: Defaults to Array
  def parse(source, opts = {})
    Parser.new(source, **(opts||{})).parse
  end

# Parse the JSON document _source_ into a Ruby data structure and return it.
  # The bang version of the parse method defaults to the more dangerous values
  # for the _opts_ hash, so be sure only to parse trusted _source_ documents.
  #
  # _opts_ can have the following keys:
  # * *max_nesting*: The maximum depth of nesting allowed in the parsed data
  #   structures. Enable depth checking with :max_nesting => anInteger. The
  #   parse! methods defaults to not doing max depth checking: This can be
  #   dangerous if someone wants to fill up your stack.
  # * *allow_nan*: If set to true, allow NaN, Infinity, and -Infinity in
  #   defiance of RFC 7159 to be parsed by the Parser. This option defaults
  #   to true.
  # * *create_additions*: If set to false, the Parser doesn't create
  #   additions even if a matching class and create_id was found. This option
  #   defaults to false.
  def parse!(source, opts = {})
    opts = {
      :max_nesting  => false,
      :allow_nan    => true
    }.merge(opts)
    Parser.new(source, **(opts||{})).parse
  end

# Generate a JSON document from the Ruby data structure _obj_ and return
  # it. _state_ is * a JSON::State object,
  # * or a Hash like object (responding to to_hash),
  # * an object convertible into a hash by a to_h method,
  # that is used as or to configure a State object.
  #
  # It defaults to a state object, that creates the shortest possible JSON text
  # in one line, checks for circular data structures and doesn't allow NaN,
  # Infinity, and -Infinity.
  #
  # A _state_ hash 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.
  # * *max_nesting*: The maximum depth of nesting allowed in the data
  #   structures from which JSON is to be generated. Disable depth checking
  #   with :max_nesting => false, it defaults to 100.
  #
  # See also the fast_generate for the fastest creation method with the least
  # amount of sanity checks, and the pretty_generate method for some
  # defaults for pretty output.
  def generate(obj, opts = nil)
    if State === opts
      state, opts = opts, nil
    else
      state = SAFE_STATE_PROTOTYPE.dup
    end
    if opts
      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
      state = state.configure(opts)
    end
    state.generate(obj)
  end

# :stopdoc:
  # I want to deprecate these later, so I'll first be silent about them, and
  # later delete them.
  alias unparse generate
  module_function :unparse
  # :startdoc:

# Generate a JSON document from the Ruby data structure _obj_ and return it.
  # This method disables the checks for circles in Ruby objects.
  #
  # *WARNING*: Be careful not to pass any Ruby data structures with circles as
  # _obj_ argument because this will cause JSON to go into an infinite loop.
  def fast_generate(obj, opts = nil)
    if State === opts
      state, opts = opts, nil
    else
      state = FAST_STATE_PROTOTYPE.dup
    end
    if opts
      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
      state.configure(opts)
    end
    state.generate(obj)
  end

# :stopdoc:
  # I want to deprecate these later, so I'll first be silent about them, and later delete them.
  alias fast_unparse fast_generate
  module_function :fast_unparse
  # :startdoc:

# Generate a JSON document from the Ruby data structure _obj_ and return it.
  # The returned document is a prettier form of the document returned by
  # #unparse.
  #
  # The _opts_ argument can be used to configure the generator. See the
  # generate method for a more detailed explanation.
  def pretty_generate(obj, opts = nil)
    if State === opts
      state, opts = opts, nil
    else
      state = PRETTY_STATE_PROTOTYPE.dup
    end
    if opts
      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
      state.configure(opts)
    end
    state.generate(obj)
  end

# :stopdoc:
  # I want to deprecate these later, so I'll first be silent about them, and later delete them.
  alias pretty_unparse pretty_generate
  module_function :pretty_unparse
  # :startdoc:

class << self
    # The global default options for the JSON.load method:
    #  :max_nesting: false
    #  :allow_nan:   true
    #  :allow_blank:  true
    attr_accessor :load_default_options
  end
  self.load_default_options = {
    :max_nesting      => false,
    :allow_nan        => true,
    :allow_blank       => true,
    :create_additions => true,
  }

# Load a ruby data structure from a JSON _source_ and return it. A source can
  # either be a string-like object, an IO-like object, or an object responding
  # to the read method. If _proc_ was given, it will be called with any nested
  # Ruby object as an argument recursively in depth first order. To modify the
  # default options pass in the optional _options_ argument as well.
  #
  # BEWARE: This method is meant to serialise data from trusted user input,
  # like from your own database server or clients under your control, it could
  # be dangerous to allow untrusted users to pass JSON sources into it. The
  # default options for the parser can be changed via the load_default_options
  # method.
  #
  # This method is part of the implementation of the load/dump interface of
  # Marshal and YAML.
  def load(source, proc = nil, options = {})
    opts = load_default_options.merge options
    if source.respond_to? :to_str
      source = source.to_str
    elsif source.respond_to? :to_io
      source = source.to_io.read
    elsif source.respond_to?(:read)
      source = source.read
    end
    if opts[:allow_blank] && (source.nil? || source.empty?)
      source = 'null'
    end
    result = parse(source, opts)
    recurse_proc(result, &proc) if proc
    result
  end

# Recursively calls passed _Proc_ if the parsed data structure is an _Array_ or _Hash_
  def recurse_proc(result, &proc)
    case result
    when Array
      result.each { |x| recurse_proc x, &proc }
      proc.call result
    when Hash
      result.each { |x, y| recurse_proc x, &proc; recurse_proc y, &proc }
      proc.call result
    else
      proc.call result
    end
  end

alias restore load
  module_function :restore

class << self
    # The global default options for the JSON.dump method:
    #  :max_nesting: false
    #  :allow_nan:   true
    #  :allow_blank: true
    attr_accessor :dump_default_options
  end
  self.dump_default_options = {
    :max_nesting => false,
    :allow_nan   => true,
  }

# Dumps _obj_ as a JSON string, i.e. calls generate on the object and returns
  # the result.
  #
  # If anIO (an IO-like object or an object that responds to the write method)
  # was given, the resulting JSON is written to it.
  #
  # If the number of nested arrays or objects exceeds _limit_, an ArgumentError
  # exception is raised. This argument is similar (but not exactly the
  # same!) to the _limit_ argument in Marshal.dump.
  #
  # The default options for the generator can be changed via the
  # dump_default_options method.
  #
  # This method is part of the implementation of the load/dump interface of
  # Marshal and YAML.
  def dump(obj, anIO = nil, limit = nil)
    if anIO and limit.nil?
      anIO = anIO.to_io if anIO.respond_to?(:to_io)
      unless anIO.respond_to?(:write)
        limit = anIO
        anIO = nil
      end
    end
    opts = JSON.dump_default_options
    opts = opts.merge(:max_nesting => limit) if limit
    result = generate(obj, opts)
    if anIO
      anIO.write result
      anIO
    else
      result
    end
  rescue JSON::NestingError
    raise ArgumentError, "exceed depth limit"
  end

# Encodes string using Ruby's _String.encode_
  def self.iconv(to, from, string)
    string.encode(to, from)
  end
end

module ::Kernel
  private

# Outputs _objs_ to STDOUT as JSON strings in the shortest form, that is in
  # one line.
  def j(*objs)
    objs.each do |obj|
      puts JSON::generate(obj, :allow_nan => true, :max_nesting => false)
    end
    nil
  end

# Outputs _objs_ to STDOUT as JSON strings in a pretty format, with
  # indentation and over many lines.
  def jj(*objs)
    objs.each do |obj|
      puts JSON::pretty_generate(obj, :allow_nan => true, :max_nesting => false)
    end
    nil
  end

# If _object_ is string-like, parse the string and return the parsed result as
  # a Ruby data structure. Otherwise, generate a JSON text from the Ruby data
  # structure object and return it.
  #
  # The _opts_ argument is passed through to generate/parse respectively. See
  # generate and parse for their documentation.
  def JSON(object, *args)
    if object.respond_to? :to_str
      JSON.parse(object.to_str, args.first)
    else
      JSON.generate(object, args.first)
    end
  end
end

# Extends any Class to include _json_creatable?_ method.
class ::Class
  # Returns true if this class can be used to create an instance
  # from a serialised JSON string. The class has to implement a class
  # method _json_create_ that expects a hash as first parameter. The hash
  # should include the required data.
  def json_creatable?
    respond_to?(:json_create)
  end
end

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