* ext/json/*, test/json/*: Reverted r50231. Because it's not works with

cross-compile environment.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50267 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/json/lib/json/common.rb

@@ -0,0 +1,484 @@
+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 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 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 false.
+  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),
+  # * 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
+    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
+
+  # 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
+
+  # Shortcut for iconv.
+  if ::String.method_defined?(:encode)
+    # 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
+
+  # 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