Module: JSON
- Defined in:
- lib/json.rb,
lib/json/ext.rb,
parser/parser.c,
lib/json/common.rb,
lib/json/version.rb,
generator/generator.c
Defined Under Namespace
Modules: Ext Classes: CircularDatastructure, GeneratorError, JSONError, MissingUnicodeSupport, NestingError, ParserError
Constant Summary collapse
- JSON_LOADED =
true
- NaN =
0.0/0
- Infinity =
1.0/0
- MinusInfinity =
-Infinity
- UnparserError =
For backwards compatibility
GeneratorError
- VERSION =
JSON version
'1.5.4'
- VERSION_ARRAY =
:nodoc:
VERSION.split(/\./).map { |x| x.to_i }
- VERSION_MAJOR =
VERSION_ARRAY[0]
- VERSION_MINOR =
VERSION_ARRAY[1]
- VERSION_BUILD =
:nodoc: :nodoc: :nodoc:
VERSION_ARRAY[2]
Class Attribute Summary collapse
-
.create_id ⇒ Object
This is create identifier, which is used to decide if the json_create hook of a class should be called.
-
.generator ⇒ Object
Returns the JSON generator module that is used by JSON.
-
.parser ⇒ Object
Returns the JSON parser class that is used by JSON.
-
.state ⇒ Object
Returns the JSON generator state class that is used by JSON.
Class Method Summary collapse
-
.[](object, opts = {}) ⇒ Object
If object is string-like, parse the string and return the parsed result as a Ruby data structure.
- .const_defined_in?(modul, constant) ⇒ Boolean
-
.deep_const_get(path) ⇒ Object
Return the constant located at path.
-
.dump(obj, anIO = nil, limit = nil) ⇒ Object
Dumps obj as a JSON string, i.e.
-
.fast_generate(obj, opts = nil) ⇒ Object
(also: fast_unparse)
Generate a JSON document from the Ruby data structure obj and return it.
-
.generate(obj, opts = nil) ⇒ Object
(also: unparse)
Generate a JSON document from the Ruby data structure obj and return it.
-
.iconv(to, from, string) ⇒ Object
Encodes string using iconv library.
-
.load(source, proc = nil) ⇒ Object
(also: restore)
Load a ruby data structure from a JSON source and return it.
-
.parse(source, opts = {}) ⇒ Object
Parse the JSON document source into a Ruby data structure and return it.
-
.parse!(source, opts = {}) ⇒ Object
Parse the JSON document source into a Ruby data structure and return it.
-
.pretty_generate(obj, opts = nil) ⇒ Object
(also: pretty_unparse)
Generate a JSON document from the Ruby data structure obj and return it.
-
.recurse_proc(result, &proc) ⇒ Object
Recursively calls passed Proc if the parsed data structure is an Array or Hash.
-
.swap!(string) ⇒ Object
Swap consecutive bytes of string in place.
Class Attribute Details
.create_id ⇒ Object
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'.
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# File 'lib/json/common.rb', line 94 def create_id @create_id end |
.generator ⇒ Object
Returns the JSON generator module that is used by JSON. This is either JSON::Ext::Generator or JSON::Pure::Generator.
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# File 'lib/json/common.rb', line 86 def generator @generator end |
.parser ⇒ Object
Returns the JSON parser class that is used by JSON. This is either JSON::Ext::Parser or JSON::Pure::Parser.
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# File 'lib/json/common.rb', line 21 def parser @parser end |
.state ⇒ Object
Returns the JSON generator state class that is used by JSON. This is either JSON::Ext::Generator::State or JSON::Pure::Generator::State.
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# File 'lib/json/common.rb', line 90 def state @state end |
Class Method Details
.[](object, opts = {}) ⇒ Object
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.
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# File 'lib/json/common.rb', line 11 def [](object, opts = {}) if object.respond_to? :to_str JSON.parse(object.to_str, opts) else JSON.generate(object, opts) end end |
.const_defined_in?(modul, constant) ⇒ Boolean
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# File 'lib/json/common.rb', line 380 def self.const_defined_in?(modul, constant) modul.const_defined?(constant) end |
.deep_const_get(path) ⇒ Object
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.
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# File 'lib/json/common.rb', line 34 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 |
.dump(obj, anIO = nil, limit = nil) ⇒ Object
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.
This method is part of the implementation of the load/dump interface of Marshal and YAML.
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# File 'lib/json/common.rb', line 336 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 limit ||= 0 result = generate(obj, :allow_nan => true, :max_nesting => limit) if anIO anIO.write result anIO else result end rescue JSON::NestingError raise ArgumentError, "exceed depth limit" end |
.fast_generate(obj, opts = nil) ⇒ Object Also known as: fast_unparse
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.
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# File 'lib/json/common.rb', line 231 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 |
.generate(obj, opts = nil) ⇒ Object Also known as: unparse
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 19.
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.
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# File 'lib/json/common.rb', line 200 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 |
.iconv(to, from, string) ⇒ Object
Encodes string using iconv library
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# File 'lib/json/common.rb', line 368 def self.iconv(to, from, string) string.encode(to, from) end |
.load(source, proc = nil) ⇒ Object Also known as: restore
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.
This method is part of the implementation of the load/dump interface of Marshal and YAML.
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# File 'lib/json/common.rb', line 294 def load(source, proc = nil) if source.respond_to? :to_str source = source.to_str elsif source.respond_to? :to_io source = source.to_io.read else source = source.read end result = parse(source, :max_nesting => false, :allow_nan => true) recurse_proc(result, &proc) if proc result end |
.parse(source, opts = {}) ⇒ Object
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 19.
-
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
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# File 'lib/json/common.rb', line 147 def parse(source, opts = {}) Parser.new(source, opts).parse end |
.parse!(source, opts = {}) ⇒ Object
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.
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# File 'lib/json/common.rb', line 166 def parse!(source, opts = {}) opts = { :max_nesting => false, :allow_nan => true }.update(opts) Parser.new(source, opts).parse end |
.pretty_generate(obj, opts = nil) ⇒ Object Also known as: pretty_unparse
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.
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# File 'lib/json/common.rb', line 262 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 |
.recurse_proc(result, &proc) ⇒ Object
Recursively calls passed Proc if the parsed data structure is an Array or Hash
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# File 'lib/json/common.rb', line 308 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 |
.swap!(string) ⇒ Object
Swap consecutive bytes of string in place.
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# File 'lib/json/common.rb', line 357 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 |