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#frozen_string_literal: false
require 'json/version'
require 'json/generic_object'
module JSON
class << self
# :call-seq:
# JSON[object] -> new_array or new_string
#
# If +object+ is a \String,
# calls JSON.parse with +object+ and +opts+ (see method #parse):
# json = '[0, 1, null]'
# JSON[json]# => [0, 1, nil]
#
# Otherwise, calls JSON.generate with +object+ and +opts+ (see method #generate):
# ruby = [0, 1, nil]
# JSON[ruby] # => '[0,1,null]'
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:
# JSON.parser # => JSON::Ext::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 # for JRuby
const_set :FAST_STATE_PROTOTYPE, create_fast_state
const_set :PRETTY_STATE_PROTOTYPE, create_pretty_state
ensure
$VERBOSE = old
end
def create_fast_state
State.new(
:indent => '',
:space => '',
:object_nl => "",
:array_nl => "",
:max_nesting => false
)
end
def create_pretty_state
State.new(
:indent => ' ',
:space => ' ',
:object_nl => "\n",
:array_nl => "\n"
)
end
# Returns the JSON generator module that is used by JSON. This is
# either JSON::Ext::Generator or JSON::Pure::Generator:
# JSON.generator # => JSON::Ext::Generator
attr_reader :generator
# Sets or Returns the JSON generator state class that is used by JSON. This is
# either JSON::Ext::Generator::State or JSON::Pure::Generator::State:
# JSON.state # => JSON::Ext::Generator::State
attr_accessor :state
end
DEFAULT_CREATE_ID = 'json_class'.freeze
private_constant :DEFAULT_CREATE_ID
CREATE_ID_TLS_KEY = "JSON.create_id".freeze
private_constant :CREATE_ID_TLS_KEY
# Sets create identifier, which is used to decide if the _json_create_
# hook of a class should be called; initial value is +json_class+:
# JSON.create_id # => 'json_class'
def self.create_id=(new_value)
Thread.current[CREATE_ID_TLS_KEY] = new_value.dup.freeze
end
# Returns the current create identifier.
# See also JSON.create_id=.
def self.create_id
Thread.current[CREATE_ID_TLS_KEY] || DEFAULT_CREATE_ID
end
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 # :nodoc:
# 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
# :call-seq:
# JSON.parse(source, opts) -> object
#
# Returns the Ruby objects created by parsing the given +source+.
#
# Argument +source+ contains the \String to be parsed.
#
# Argument +opts+, if given, contains a \Hash of options for the parsing.
# See {Parsing Options}[#module-JSON-label-Parsing+Options].
#
# ---
#
# When +source+ is a \JSON array, returns a Ruby \Array:
# source = '["foo", 1.0, true, false, null]'
# ruby = JSON.parse(source)
# ruby # => ["foo", 1.0, true, false, nil]
# ruby.class # => Array
#
# When +source+ is a \JSON object, returns a Ruby \Hash:
# source = '{"a": "foo", "b": 1.0, "c": true, "d": false, "e": null}'
# ruby = JSON.parse(source)
# ruby # => {"a"=>"foo", "b"=>1.0, "c"=>true, "d"=>false, "e"=>nil}
# ruby.class # => Hash
#
# For examples of parsing for all \JSON data types, see
# {Parsing \JSON}[#module-JSON-label-Parsing+JSON].
#
# Parses nested JSON objects:
# source = <<-EOT
# {
# "name": "Dave",
# "age" :40,
# "hats": [
# "Cattleman's",
# "Panama",
# "Tophat"
# ]
# }
# EOT
# ruby = JSON.parse(source)
# ruby # => {"name"=>"Dave", "age"=>40, "hats"=>["Cattleman's", "Panama", "Tophat"]}
#
# ---
#
# Raises an exception if +source+ is not valid JSON:
# # Raises JSON::ParserError (783: unexpected token at ''):
# JSON.parse('')
#
def parse(source, opts = {})
Parser.new(source, **(opts||{})).parse
end
# :call-seq:
# JSON.parse!(source, opts) -> object
#
# Calls
# parse(source, opts)
# with +source+ and possibly modified +opts+.
#
# Differences from JSON.parse:
# - Option +max_nesting+, if not provided, defaults to +false+,
# which disables checking for nesting depth.
# - Option +allow_nan+, if not provided, defaults to +true+.
def parse!(source, opts = {})
opts = {
:max_nesting => false,
:allow_nan => true
}.merge(opts)
Parser.new(source, **(opts||{})).parse
end
# :call-seq:
# JSON.load_file(path, opts={}) -> object
#
# Calls:
# parse(File.read(path), opts)
#
# See method #parse.
def load_file(filespec, opts = {})
parse(File.read(filespec), opts)
end
# :call-seq:
# JSON.load_file!(path, opts = {})
#
# Calls:
# JSON.parse!(File.read(path, opts))
#
# See method #parse!
def load_file!(filespec, opts = {})
parse!(File.read(filespec), opts)
end
# :call-seq:
# JSON.generate(obj, opts = nil) -> new_string
#
# Returns a \String containing the generated \JSON data.
#
# See also JSON.fast_generate, JSON.pretty_generate.
#
# Argument +obj+ is the Ruby object to be converted to \JSON.
#
# Argument +opts+, if given, contains a \Hash of options for the generation.
# See {Generating Options}[#module-JSON-label-Generating+Options].
#
# ---
#
# When +obj+ is an \Array, returns a \String containing a \JSON array:
# obj = ["foo", 1.0, true, false, nil]
# json = JSON.generate(obj)
# json # => '["foo",1.0,true,false,null]'
#
# When +obj+ is a \Hash, returns a \String containing a \JSON object:
# obj = {foo: 0, bar: 's', baz: :bat}
# json = JSON.generate(obj)
# json # => '{"foo":0,"bar":"s","baz":"bat"}'
#
# For examples of generating from other Ruby objects, see
# {Generating \JSON from Other Objects}[#module-JSON-label-Generating+JSON+from+Other+Objects].
#
# ---
#
# Raises an exception if any formatting option is not a \String.
#
# Raises an exception if +obj+ contains circular references:
# a = []; b = []; a.push(b); b.push(a)
# # Raises JSON::NestingError (nesting of 100 is too deep):
# JSON.generate(a)
#
def generate(obj, opts = nil)
if State === opts
state, opts = opts, nil
else
state = State.new
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:
# :call-seq:
# JSON.fast_generate(obj, opts) -> new_string
#
# Arguments +obj+ and +opts+ here are the same as
# arguments +obj+ and +opts+ in JSON.generate.
#
# By default, generates \JSON data without checking
# for circular references in +obj+ (option +max_nesting+ set to +false+, disabled).
#
# Raises an exception if +obj+ contains circular references:
# a = []; b = []; a.push(b); b.push(a)
# # Raises SystemStackError (stack level too deep):
# JSON.fast_generate(a)
def fast_generate(obj, opts = nil)
if State === opts
state, opts = opts, nil
else
state = JSON.create_fast_state
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:
# :call-seq:
# JSON.pretty_generate(obj, opts = nil) -> new_string
#
# Arguments +obj+ and +opts+ here are the same as
# arguments +obj+ and +opts+ in JSON.generate.
#
# Default options are:
# {
# indent: ' ', # Two spaces
# space: ' ', # One space
# array_nl: "\n", # Newline
# object_nl: "\n" # Newline
# }
#
# Example:
# obj = {foo: [:bar, :baz], bat: {bam: 0, bad: 1}}
# json = JSON.pretty_generate(obj)
# puts json
# Output:
# {
# "foo": [
# "bar",
# "baz"
# ],
# "bat": {
# "bam": 0,
# "bad": 1
# }
# }
#
def pretty_generate(obj, opts = nil)
if State === opts
state, opts = opts, nil
else
state = JSON.create_pretty_state
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
# Sets or returns default options for the JSON.load method.
# Initially:
# opts = JSON.load_default_options
# opts # => {:max_nesting=>false, :allow_nan=>true, :allow_blank=>true, :create_additions=>true}
attr_accessor :load_default_options
end
self.load_default_options = {
:max_nesting => false,
:allow_nan => true,
:allow_blank => true,
:create_additions => true,
}
# :call-seq:
# JSON.load(source, proc = nil, options = {}) -> object
#
# Returns the Ruby objects created by parsing the given +source+.
#
# - Argument +source+ must be, or be convertible to, a \String:
# - If +source+ responds to instance method +to_str+,
# <tt>source.to_str</tt> becomes the source.
# - If +source+ responds to instance method +to_io+,
# <tt>source.to_io.read</tt> becomes the source.
# - If +source+ responds to instance method +read+,
# <tt>source.read</tt> becomes the source.
# - If both of the following are true, source becomes the \String <tt>'null'</tt>:
# - Option +allow_blank+ specifies a truthy value.
# - The source, as defined above, is +nil+ or the empty \String <tt>''</tt>.
# - Otherwise, +source+ remains the source.
# - Argument +proc+, if given, must be a \Proc that accepts one argument.
# It will be called recursively with each result (depth-first order).
# See details below.
# 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.
# - Argument +opts+, if given, contains a \Hash of options for the parsing.
# See {Parsing Options}[#module-JSON-label-Parsing+Options].
# The default options can be changed via method JSON.load_default_options=.
#
# ---
#
# When no +proc+ is given, modifies +source+ as above and returns the result of
# <tt>parse(source, opts)</tt>; see #parse.
#
# Source for following examples:
# source = <<-EOT
# {
# "name": "Dave",
# "age" :40,
# "hats": [
# "Cattleman's",
# "Panama",
# "Tophat"
# ]
# }
# EOT
#
# Load a \String:
# ruby = JSON.load(source)
# ruby # => {"name"=>"Dave", "age"=>40, "hats"=>["Cattleman's", "Panama", "Tophat"]}
#
# Load an \IO object:
# require 'stringio'
# object = JSON.load(StringIO.new(source))
# object # => {"name"=>"Dave", "age"=>40, "hats"=>["Cattleman's", "Panama", "Tophat"]}
#
# Load a \File object:
# path = 't.json'
# File.write(path, source)
# File.open(path) do |file|
# JSON.load(file)
# end # => {"name"=>"Dave", "age"=>40, "hats"=>["Cattleman's", "Panama", "Tophat"]}
#
# ---
#
# When +proc+ is given:
# - Modifies +source+ as above.
# - Gets the +result+ from calling <tt>parse(source, opts)</tt>.
# - Recursively calls <tt>proc(result)</tt>.
# - Returns the final result.
#
# Example:
# require 'json'
#
# # Some classes for the example.
# class Base
# def initialize(attributes)
# @attributes = attributes
# end
# end
# class User < Base; end
# class Account < Base; end
# class Admin < Base; end
# # The JSON source.
# json = <<-EOF
# {
# "users": [
# {"type": "User", "username": "jane", "email": "jane@example.com"},
# {"type": "User", "username": "john", "email": "john@example.com"}
# ],
# "accounts": [
# {"account": {"type": "Account", "paid": true, "account_id": "1234"}},
# {"account": {"type": "Account", "paid": false, "account_id": "1235"}}
# ],
# "admins": {"type": "Admin", "password": "0wn3d"}
# }
# EOF
# # Deserializer method.
# def deserialize_obj(obj, safe_types = %w(User Account Admin))
# type = obj.is_a?(Hash) && obj["type"]
# safe_types.include?(type) ? Object.const_get(type).new(obj) : obj
# end
# # Call to JSON.load
# ruby = JSON.load(json, proc {|obj|
# case obj
# when Hash
# obj.each {|k, v| obj[k] = deserialize_obj v }
# when Array
# obj.map! {|v| deserialize_obj v }
# end
# })
# pp ruby
# Output:
# {"users"=>
# [#<User:0x00000000064c4c98
# @attributes=
# {"type"=>"User", "username"=>"jane", "email"=>"jane@example.com"}>,
# #<User:0x00000000064c4bd0
# @attributes=
# {"type"=>"User", "username"=>"john", "email"=>"john@example.com"}>],
# "accounts"=>
# [{"account"=>
# #<Account:0x00000000064c4928
# @attributes={"type"=>"Account", "paid"=>true, "account_id"=>"1234"}>},
# {"account"=>
# #<Account:0x00000000064c4680
# @attributes={"type"=>"Account", "paid"=>false, "account_id"=>"1235"}>}],
# "admins"=>
# #<Admin:0x00000000064c41f8
# @attributes={"type"=>"Admin", "password"=>"0wn3d"}>}
#
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) # :nodoc:
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
# Sets or returns the default options for the JSON.dump method.
# Initially:
# opts = JSON.dump_default_options
# opts # => {:max_nesting=>false, :allow_nan=>true, :escape_slash=>false}
attr_accessor :dump_default_options
end
self.dump_default_options = {
:max_nesting => false,
:allow_nan => true,
:escape_slash => false,
}
# :call-seq:
# JSON.dump(obj, io = nil, limit = nil)
#
# Dumps +obj+ as a \JSON string, i.e. calls generate on the object and returns the result.
#
# The default options can be changed via method JSON.dump_default_options.
#
# - Argument +io+, if given, should respond to method +write+;
# the \JSON \String is written to +io+, and +io+ is returned.
# If +io+ is not given, the \JSON \String is returned.
# - Argument +limit+, if given, is passed to JSON.generate as option +max_nesting+.
#
# ---
#
# When argument +io+ is not given, returns the \JSON \String generated from +obj+:
# obj = {foo: [0, 1], bar: {baz: 2, bat: 3}, bam: :bad}
# json = JSON.dump(obj)
# json # => "{\"foo\":[0,1],\"bar\":{\"baz\":2,\"bat\":3},\"bam\":\"bad\"}"
#
# When argument +io+ is given, writes the \JSON \String to +io+ and returns +io+:
# path = 't.json'
# File.open(path, 'w') do |file|
# JSON.dump(obj, file)
# end # => #<File:t.json (closed)>
# puts File.read(path)
# Output:
# {"foo":[0,1],"bar":{"baz":2,"bat":3},"bam":"bad"}
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 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