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 JSON.const_defined_in?(self, :Parser) 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 JSON.const_defined_in?(p, c) 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 4627 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 true. # * *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 4627 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 true. def parse!(source, opts = {}) opts = { :max_nesting => false, :allow_nan => true }.update(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), # * or 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 # :quirks_mode: true attr_accessor :load_default_options end self.load_default_options = { :max_nesting => false, :allow_nan => true, :quirks_mode => 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[:quirks_mode] && (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 # :quirks_mode: true attr_accessor :dump_default_options end self.dump_default_options = { :max_nesting => false, :allow_nan => true, :quirks_mode => 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 limit and opts.update(:max_nesting => limit) result = generate(obj, opts) if anIO anIO.write result anIO else result end rescue JSON::NestingError raise ArgumentError, "exceed depth limit" end # Swap consecutive bytes of _string_ in place. def self.swap!(string) # :nodoc: 0.upto(string.size / 2) do |i| break unless string[2 * i + 1] string[2 * i], string[2 * i + 1] = string[2 * i + 1], string[2 * i] end string end # Shortuct for iconv. if ::String.method_defined?(:encode) && # XXX Rubinius doesn't support ruby 1.9 encoding yet defined?(RUBY_ENGINE) && RUBY_ENGINE != 'rbx' then # Encodes string using Ruby's _String.encode_ def self.iconv(to, from, string) string.encode(to, from) end else require 'iconv' # Encodes string using _iconv_ library def self.iconv(to, from, string) Iconv.conv(to, from, string) end end if ::Object.method(:const_defined?).arity == 1 def self.const_defined_in?(modul, constant) modul.const_defined?(constant) end else def self.const_defined_in?(modul, constant) modul.const_defined?(constant, false) end 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 # Ouputs _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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