class JSON::TruffleRuby::Generator::State

This class is used to create State instances, that are use to hold data while generating a JSON text from a Ruby data structure.

Attributes

array_nl [RW]

This string is put at the end of a line that holds a JSON array.

depth [RW]

This integer returns the current depth data structure nesting in the generated JSON.

indent [RW]

This string is used to indent levels in the JSON text.

max_nesting [RW]

This integer returns the maximum level of data structure nesting in the generated JSON, max_nesting = 0 if no maximum is checked.

object_nl [RW]

This string is put at the end of a line that holds a JSON object (or Hash).

script_safe [RW]

If this attribute is set to true, forward slashes will be escaped in all json strings.

space [RW]

This string is used to insert a space between the tokens in a JSON string.

space_before [RW]

This string is used to insert a space before the ‘:’ in JSON objects.

strict [RW]

If this attribute is set to true, attempting to serialize types not supported by the JSON spec will raise a JSON::GeneratorError

Public Class Methods

from_state (opts)

Source

# File lib/json/truffle_ruby/generator.rb, line 113
def self.from_state(opts)
  case
  when self === opts
    opts
  when opts.respond_to?(:to_hash)
    new(opts.to_hash)
  when opts.respond_to?(:to_h)
    new(opts.to_h)
  else
    SAFE_STATE_PROTOTYPE.dup
  end
end

Creates a State object from opts, which ought to be Hash to create a new State instance configured by opts, something else to create an unconfigured instance. If opts is a State object, it is just returned.

generate (obj, opts = nil, io = nil)

Source

# File lib/json/truffle_ruby/generator.rb, line 99
def self.generate(obj, opts = nil, io = nil)
  string = new(opts).generate(obj)
  if io
    io.write(string)
    io
  else
    string
  end
end

new (opts = nil)

Source

# File lib/json/truffle_ruby/generator.rb, line 143
def initialize(opts = nil)
  @indent                = ''
  @space                 = ''
  @space_before          = ''
  @object_nl             = ''
  @array_nl              = ''
  @allow_nan             = false
  @ascii_only            = false
  @depth                 = 0
  @buffer_initial_length = 1024
  @script_safe           = false
  @strict                = false
  @max_nesting           = 100
  configure(opts) if opts
end

Instantiates a new State object, configured by opts.

opts 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: ”),
script_safe: true if U+2028, U+2029 and forward slash (/) should be escaped as to make the JSON object safe to interpolate in a script tag (default: false).
check_circular: is deprecated now, use the :max_nesting option instead,
max_nesting: sets the maximum level of data structure nesting in the generated JSON, max_nesting = 0 if no maximum should be checked.
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.

Public Instance Methods

[] (name)

Source

# File lib/json/truffle_ruby/generator.rb, line 383
def [](name)
  if respond_to?(name)
    __send__(name)
  else
    instance_variable_get("@#{name}") if
      instance_variables.include?("@#{name}".to_sym) # avoid warning
  end
end

Return the value returned by method name.

[]= (name, value)

Source

# File lib/json/truffle_ruby/generator.rb, line 392
def []=(name, value)
  if respond_to?(name_writer = "#{name}=")
    __send__ name_writer, value
  else
    instance_variable_set "@#{name}", value
  end
end

allow_nan? ()

Source

# File lib/json/truffle_ruby/generator.rb, line 217
def allow_nan?
  @allow_nan
end

Returns true if NaN, Infinity, and -Infinity should be considered as valid JSON and output.

ascii_only? ()

Source

# File lib/json/truffle_ruby/generator.rb, line 223
def ascii_only?
  @ascii_only
end

Returns true, if only ASCII characters should be generated. Otherwise returns false.

check_circular? ()

Source

# File lib/json/truffle_ruby/generator.rb, line 211
def check_circular?
  !@max_nesting.zero?
end

Returns true, if circular data structures are checked, otherwise returns false.

configure (opts)

Source

# File lib/json/truffle_ruby/generator.rb, line 241
def configure(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
  opts.each do |key, value|
    instance_variable_set "@#{key}", value
  end

  # NOTE: If adding new instance variables here, check whether #generate should check them for #generate_json
  @indent                = opts[:indent]        || '' if opts.key?(:indent)
  @space                 = opts[:space]         || '' if opts.key?(:space)
  @space_before          = opts[:space_before]  || '' if opts.key?(:space_before)
  @object_nl             = opts[:object_nl]     || '' if opts.key?(:object_nl)
  @array_nl              = opts[:array_nl]      || '' if opts.key?(:array_nl)
  @allow_nan             = !!opts[:allow_nan]         if opts.key?(:allow_nan)
  @ascii_only            = opts[:ascii_only]          if opts.key?(:ascii_only)
  @depth                 = opts[:depth] || 0
  @buffer_initial_length ||= opts[:buffer_initial_length]

  @script_safe = if opts.key?(:script_safe)
    !!opts[:script_safe]
  elsif opts.key?(:escape_slash)
    !!opts[:escape_slash]
  else
    false
  end

  @strict                = !!opts[:strict] if opts.key?(:strict)

  if !opts.key?(:max_nesting) # defaults to 100
    @max_nesting = 100
  elsif opts[:max_nesting]
    @max_nesting = opts[:max_nesting]
  else
    @max_nesting = 0
  end
  self
end

Configure this State instance with the Hash opts, and return itself.

Also aliased as: merge

generate (obj)

Source

# File lib/json/truffle_ruby/generator.rb, line 302
def generate(obj)
  if @indent.empty? and @space.empty? and @space_before.empty? and @object_nl.empty? and @array_nl.empty? and
      !@ascii_only and !@script_safe and @max_nesting == 0 and !@strict
    result = generate_json(obj, ''.dup)
  else
    result = obj.to_json(self)
  end
  JSON::TruffleRuby::Generator.valid_utf8?(result) or raise GeneratorError.new(
    "source sequence #{result.inspect} is illegal/malformed utf-8",
    obj
  )
  result
end

Generates a valid JSON document from object obj and returns the result. If no valid JSON document can be created this method raises a GeneratorError exception.

merge (opts)

Alias for: configure

script_safe? ()

Source

# File lib/json/truffle_ruby/generator.rb, line 228
def script_safe?
  @script_safe
end

Returns true, if forward slashes are escaped. Otherwise returns false.

strict? ()

Source

# File lib/json/truffle_ruby/generator.rb, line 235
def strict?
  @strict
end

Returns true, if strict mode is enabled. Otherwise returns false. Strict mode only allow serializing JSON native types: Hash, Array, String, Integer, Float, true, false and nil.

to_h ()

Source

# File lib/json/truffle_ruby/generator.rb, line 287
def to_h
  result = {}
  instance_variables.each do |iv|
    iv = iv.to_s[1..-1]
    result[iv.to_sym] = self[iv]
  end
  result
end

Returns the configuration instance variables as a hash, that can be passed to the configure method.

Also aliased as: to_hash

to_hash ()

Alias for: to_h

Private Instance Methods

generate_json (obj, buf)

Source

# File lib/json/truffle_ruby/generator.rb, line 317
        def generate_json(obj, buf)
  case obj
  when Hash
    buf << '{'
    first = true
    obj.each_pair do |k,v|
      buf << ',' unless first

      key_str = k.to_s
      if key_str.class == String
        fast_serialize_string(key_str, buf)
      elsif key_str.is_a?(String)
        generate_json(key_str, buf)
      else
        raise TypeError, "#{k.class}#to_s returns an instance of #{key_str.class}, expected a String"
      end

      buf << ':'
      generate_json(v, buf)
      first = false
    end
    buf << '}'
  when Array
    buf << '['
    first = true
    obj.each do |e|
      buf << ',' unless first
      generate_json(e, buf)
      first = false
    end
    buf << ']'
  when String
    if obj.class == String
      fast_serialize_string(obj, buf)
    else
      buf << obj.to_json(self)
    end
  when Integer
    buf << obj.to_s
  else
    # Note: Float is handled this way since Float#to_s is slow anyway
    buf << obj.to_json(self)
  end
end

Handles @allow_nan, @buffer_initial_length, other ivars must be the default value (see above)