691 lines
24 KiB
Ruby
691 lines
24 KiB
Ruby
# frozen_string_literal: true
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module JSON
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module TruffleRuby
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module Generator
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MAP = {
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"\x0" => '\u0000',
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"\x1" => '\u0001',
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"\x2" => '\u0002',
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"\x3" => '\u0003',
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"\x4" => '\u0004',
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"\x5" => '\u0005',
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"\x6" => '\u0006',
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"\x7" => '\u0007',
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"\b" => '\b',
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"\t" => '\t',
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"\n" => '\n',
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"\xb" => '\u000b',
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"\f" => '\f',
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"\r" => '\r',
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"\xe" => '\u000e',
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"\xf" => '\u000f',
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"\x10" => '\u0010',
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"\x11" => '\u0011',
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"\x12" => '\u0012',
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"\x13" => '\u0013',
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"\x14" => '\u0014',
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"\x15" => '\u0015',
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"\x16" => '\u0016',
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"\x17" => '\u0017',
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"\x18" => '\u0018',
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"\x19" => '\u0019',
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"\x1a" => '\u001a',
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"\x1b" => '\u001b',
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"\x1c" => '\u001c',
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"\x1d" => '\u001d',
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"\x1e" => '\u001e',
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"\x1f" => '\u001f',
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'"' => '\"',
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'\\' => '\\\\',
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}.freeze # :nodoc:
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SCRIPT_SAFE_MAP = MAP.merge(
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'/' => '\\/',
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"\u2028" => '\u2028',
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"\u2029" => '\u2029',
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).freeze
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SCRIPT_SAFE_ESCAPE_PATTERN = /[\/"\\\x0-\x1f\u2028-\u2029]/
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# Convert a UTF8 encoded Ruby string _string_ to a JSON string, encoded with
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# UTF16 big endian characters as \u????, and return it.
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def self.utf8_to_json(string, script_safe = false) # :nodoc:
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if script_safe
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if SCRIPT_SAFE_ESCAPE_PATTERN.match?(string)
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string.gsub(SCRIPT_SAFE_ESCAPE_PATTERN, SCRIPT_SAFE_MAP)
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else
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string
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end
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else
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if /["\\\x0-\x1f]/.match?(string)
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string.gsub(/["\\\x0-\x1f]/, MAP)
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else
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string
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end
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end
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end
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def self.utf8_to_json_ascii(original_string, script_safe = false) # :nodoc:
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string = original_string.b
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map = script_safe ? SCRIPT_SAFE_MAP : MAP
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string.gsub!(/[\/"\\\x0-\x1f]/n) { map[$&] || $& }
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string.gsub!(/(
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(?:
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[\xc2-\xdf][\x80-\xbf] |
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[\xe0-\xef][\x80-\xbf]{2} |
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[\xf0-\xf4][\x80-\xbf]{3}
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)+ |
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[\x80-\xc1\xf5-\xff] # invalid
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)/nx) { |c|
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c.size == 1 and raise GeneratorError.new("invalid utf8 byte: '#{c}'", original_string)
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s = c.encode(::Encoding::UTF_16BE, ::Encoding::UTF_8).unpack('H*')[0]
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s.force_encoding(::Encoding::BINARY)
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s.gsub!(/.{4}/n, '\\\\u\&')
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s.force_encoding(::Encoding::UTF_8)
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}
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string.force_encoding(::Encoding::UTF_8)
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string
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rescue => e
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raise GeneratorError.new(e.message, original_string)
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end
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def self.valid_utf8?(string)
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encoding = string.encoding
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(encoding == Encoding::UTF_8 || encoding == Encoding::ASCII) &&
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string.valid_encoding?
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end
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# This class is used to create State instances, that are use to hold data
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# while generating a JSON text from a Ruby data structure.
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class State
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def self.generate(obj, opts = nil, io = nil)
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new(opts).generate(obj, io)
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end
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# Creates a State object from _opts_, which ought to be Hash to create
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# a new State instance configured by _opts_, something else to create
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# an unconfigured instance. If _opts_ is a State object, it is just
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# returned.
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def self.from_state(opts)
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if opts
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case
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when self === opts
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return opts
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when opts.respond_to?(:to_hash)
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return new(opts.to_hash)
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when opts.respond_to?(:to_h)
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return new(opts.to_h)
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end
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end
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SAFE_STATE_PROTOTYPE.dup
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end
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# Instantiates a new State object, configured by _opts_.
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#
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# _opts_ can have the following keys:
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#
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# * *indent*: a string used to indent levels (default: ''),
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# * *space*: a string that is put after, a : or , delimiter (default: ''),
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# * *space_before*: a string that is put before a : pair delimiter (default: ''),
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# * *object_nl*: a string that is put at the end of a JSON object (default: ''),
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# * *array_nl*: a string that is put at the end of a JSON array (default: ''),
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# * *script_safe*: true if U+2028, U+2029 and forward slash (/) should be escaped
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# as to make the JSON object safe to interpolate in a script tag (default: false).
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# * *check_circular*: is deprecated now, use the :max_nesting option instead,
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# * *max_nesting*: sets the maximum level of data structure nesting in
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# the generated JSON, max_nesting = 0 if no maximum should be checked.
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# * *allow_nan*: true if NaN, Infinity, and -Infinity should be
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# generated, otherwise an exception is thrown, if these values are
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# encountered. This options defaults to false.
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def initialize(opts = nil)
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@indent = ''
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@space = ''
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@space_before = ''
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@object_nl = ''
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@array_nl = ''
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@allow_nan = false
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@ascii_only = false
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@as_json = false
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@depth = 0
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@buffer_initial_length = 1024
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@script_safe = false
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@strict = false
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@max_nesting = 100
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configure(opts) if opts
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end
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# This string is used to indent levels in the JSON text.
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attr_accessor :indent
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# This string is used to insert a space between the tokens in a JSON
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# string.
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attr_accessor :space
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# This string is used to insert a space before the ':' in JSON objects.
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attr_accessor :space_before
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# This string is put at the end of a line that holds a JSON object (or
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# Hash).
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attr_accessor :object_nl
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# This string is put at the end of a line that holds a JSON array.
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attr_accessor :array_nl
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# This proc converts unsupported types into native JSON types.
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attr_accessor :as_json
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# This integer returns the maximum level of data structure nesting in
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# the generated JSON, max_nesting = 0 if no maximum is checked.
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attr_accessor :max_nesting
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# If this attribute is set to true, forward slashes will be escaped in
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# all json strings.
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attr_accessor :script_safe
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# If this attribute is set to true, attempting to serialize types not
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# supported by the JSON spec will raise a JSON::GeneratorError
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attr_accessor :strict
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# :stopdoc:
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attr_reader :buffer_initial_length
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def buffer_initial_length=(length)
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if length > 0
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@buffer_initial_length = length
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end
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end
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# :startdoc:
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# This integer returns the current depth data structure nesting in the
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# generated JSON.
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attr_accessor :depth
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def check_max_nesting # :nodoc:
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return if @max_nesting.zero?
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current_nesting = depth + 1
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current_nesting > @max_nesting and
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raise NestingError, "nesting of #{current_nesting} is too deep"
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end
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# Returns true, if circular data structures are checked,
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# otherwise returns false.
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def check_circular?
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!@max_nesting.zero?
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end
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# Returns true if NaN, Infinity, and -Infinity should be considered as
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# valid JSON and output.
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def allow_nan?
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@allow_nan
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end
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# Returns true, if only ASCII characters should be generated. Otherwise
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# returns false.
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def ascii_only?
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@ascii_only
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end
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# Returns true, if forward slashes are escaped. Otherwise returns false.
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def script_safe?
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@script_safe
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end
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# Returns true, if strict mode is enabled. Otherwise returns false.
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# Strict mode only allow serializing JSON native types: Hash, Array,
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# String, Integer, Float, true, false and nil.
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def strict?
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@strict
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end
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# Configure this State instance with the Hash _opts_, and return
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# itself.
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def configure(opts)
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if opts.respond_to?(:to_hash)
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opts = opts.to_hash
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elsif opts.respond_to?(:to_h)
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opts = opts.to_h
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else
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raise TypeError, "can't convert #{opts.class} into Hash"
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end
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opts.each do |key, value|
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instance_variable_set "@#{key}", value
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end
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# NOTE: If adding new instance variables here, check whether #generate should check them for #generate_json
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@indent = opts[:indent] || '' if opts.key?(:indent)
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@space = opts[:space] || '' if opts.key?(:space)
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@space_before = opts[:space_before] || '' if opts.key?(:space_before)
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@object_nl = opts[:object_nl] || '' if opts.key?(:object_nl)
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@array_nl = opts[:array_nl] || '' if opts.key?(:array_nl)
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@allow_nan = !!opts[:allow_nan] if opts.key?(:allow_nan)
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@as_json = opts[:as_json].to_proc if opts[:as_json]
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@ascii_only = opts[:ascii_only] if opts.key?(:ascii_only)
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@depth = opts[:depth] || 0
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@buffer_initial_length ||= opts[:buffer_initial_length]
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@script_safe = if opts.key?(:script_safe)
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!!opts[:script_safe]
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elsif opts.key?(:escape_slash)
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!!opts[:escape_slash]
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else
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false
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end
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@strict = !!opts[:strict] if opts.key?(:strict)
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if !opts.key?(:max_nesting) # defaults to 100
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@max_nesting = 100
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elsif opts[:max_nesting]
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@max_nesting = opts[:max_nesting]
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else
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@max_nesting = 0
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end
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self
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end
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alias merge configure
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# Returns the configuration instance variables as a hash, that can be
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# passed to the configure method.
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def to_h
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result = {}
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instance_variables.each do |iv|
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iv = iv.to_s[1..-1]
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result[iv.to_sym] = self[iv]
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end
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result
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end
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alias to_hash to_h
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# Generates a valid JSON document from object +obj+ and
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# returns the result. If no valid JSON document can be
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# created this method raises a
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# GeneratorError exception.
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def generate(obj, anIO = nil)
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if @indent.empty? and @space.empty? and @space_before.empty? and @object_nl.empty? and @array_nl.empty? and
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!@ascii_only and !@script_safe and @max_nesting == 0 and (!@strict || Symbol === obj)
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result = generate_json(obj, ''.dup)
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else
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result = obj.to_json(self)
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end
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JSON::TruffleRuby::Generator.valid_utf8?(result) or raise GeneratorError.new(
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"source sequence #{result.inspect} is illegal/malformed utf-8",
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obj
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)
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if anIO
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anIO.write(result)
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anIO
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else
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result
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end
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end
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def generate_new(obj, anIO = nil) # :nodoc:
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dup.generate(obj, anIO)
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end
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# Handles @allow_nan, @buffer_initial_length, other ivars must be the default value (see above)
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private def generate_json(obj, buf)
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case obj
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when Hash
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buf << '{'
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first = true
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obj.each_pair do |k,v|
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buf << ',' unless first
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key_str = k.to_s
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if key_str.class == String
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fast_serialize_string(key_str, buf)
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elsif key_str.is_a?(String)
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generate_json(key_str, buf)
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else
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raise TypeError, "#{k.class}#to_s returns an instance of #{key_str.class}, expected a String"
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end
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buf << ':'
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generate_json(v, buf)
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first = false
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end
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buf << '}'
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when Array
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buf << '['
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first = true
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obj.each do |e|
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buf << ',' unless first
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generate_json(e, buf)
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first = false
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end
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buf << ']'
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when String
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if obj.class == String
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fast_serialize_string(obj, buf)
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else
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buf << obj.to_json(self)
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end
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when Integer
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buf << obj.to_s
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when Symbol
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if @strict
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fast_serialize_string(obj.name, buf)
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else
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buf << obj.to_json(self)
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end
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else
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# Note: Float is handled this way since Float#to_s is slow anyway
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buf << obj.to_json(self)
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end
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end
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# Assumes !@ascii_only, !@script_safe
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private def fast_serialize_string(string, buf) # :nodoc:
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buf << '"'
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unless string.encoding == ::Encoding::UTF_8
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begin
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string = string.encode(::Encoding::UTF_8)
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rescue Encoding::UndefinedConversionError => error
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raise GeneratorError.new(error.message, string)
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end
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end
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raise GeneratorError.new("source sequence is illegal/malformed utf-8", string) unless string.valid_encoding?
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if /["\\\x0-\x1f]/.match?(string)
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buf << string.gsub(/["\\\x0-\x1f]/, MAP)
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else
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buf << string
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end
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buf << '"'
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end
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# Return the value returned by method +name+.
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def [](name)
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if respond_to?(name)
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__send__(name)
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else
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instance_variable_get("@#{name}") if
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instance_variables.include?("@#{name}".to_sym) # avoid warning
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end
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end
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def []=(name, value)
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if respond_to?(name_writer = "#{name}=")
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__send__ name_writer, value
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else
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instance_variable_set "@#{name}", value
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end
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end
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end
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module GeneratorMethods
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module Object
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# Converts this object to a string (calling #to_s), converts
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# it to a JSON string, and returns the result. This is a fallback, if no
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# special method #to_json was defined for some object.
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def to_json(state = nil, *)
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state = State.from_state(state) if state
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if state&.strict?
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value = self
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if state.strict? && !(false == value || true == value || nil == value || String === value || Array === value || Hash === value || Integer === value || Float === value || Fragment === value)
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if state.as_json
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value = state.as_json.call(value)
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unless false == value || true == value || nil == value || String === value || Array === value || Hash === value || Integer === value || Float === value || Fragment === value
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raise GeneratorError.new("#{value.class} returned by #{state.as_json} not allowed in JSON", value)
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end
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value.to_json(state)
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else
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raise GeneratorError.new("#{value.class} not allowed in JSON", value)
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end
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end
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else
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to_s.to_json
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end
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end
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end
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module Hash
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# Returns a JSON string containing a JSON object, that is unparsed from
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# this Hash instance.
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# _state_ is a JSON::State object, that can also be used to configure the
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# produced JSON string output further.
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# _depth_ is used to find out nesting depth, to indent accordingly.
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def to_json(state = nil, *)
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state = State.from_state(state)
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state.check_max_nesting
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json_transform(state)
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end
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private
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def json_shift(state)
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state.object_nl.empty? or return ''
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state.indent * state.depth
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end
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def json_transform(state)
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depth = state.depth += 1
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if empty?
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state.depth -= 1
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return '{}'
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end
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delim = ",#{state.object_nl}"
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result = +"{#{state.object_nl}"
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first = true
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indent = !state.object_nl.empty?
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each { |key, value|
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result << delim unless first
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result << state.indent * depth if indent
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key_str = key.to_s
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if key_str.is_a?(String)
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key_json = key_str.to_json(state)
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else
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raise TypeError, "#{key.class}#to_s returns an instance of #{key_str.class}, expected a String"
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end
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result = +"#{result}#{key_json}#{state.space_before}:#{state.space}"
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if state.strict? && !(false == value || true == value || nil == value || String === value || Array === value || Hash === value || Integer === value || Float === value || Fragment === value)
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if state.as_json
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value = state.as_json.call(value)
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unless false == value || true == value || nil == value || String === value || Array === value || Hash === value || Integer === value || Float === value || Fragment === value
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raise GeneratorError.new("#{value.class} returned by #{state.as_json} not allowed in JSON", value)
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end
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result << value.to_json(state)
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else
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raise GeneratorError.new("#{value.class} not allowed in JSON", value)
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end
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elsif value.respond_to?(:to_json)
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result << value.to_json(state)
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else
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result << %{"#{String(value)}"}
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end
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first = false
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}
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depth = state.depth -= 1
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unless first
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result << state.object_nl
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result << state.indent * depth if indent
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end
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result << '}'
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result
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end
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end
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module Array
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# Returns a JSON string containing a JSON array, that is unparsed from
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# this Array instance.
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# _state_ is a JSON::State object, that can also be used to configure the
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# produced JSON string output further.
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def to_json(state = nil, *)
|
|
state = State.from_state(state)
|
|
state.check_max_nesting
|
|
json_transform(state)
|
|
end
|
|
|
|
private
|
|
|
|
def json_transform(state)
|
|
depth = state.depth += 1
|
|
|
|
if empty?
|
|
state.depth -= 1
|
|
return '[]'
|
|
end
|
|
|
|
result = '['.dup
|
|
if state.array_nl.empty?
|
|
delim = ","
|
|
else
|
|
result << state.array_nl
|
|
delim = ",#{state.array_nl}"
|
|
end
|
|
|
|
first = true
|
|
indent = !state.array_nl.empty?
|
|
each { |value|
|
|
result << delim unless first
|
|
result << state.indent * depth if indent
|
|
if state.strict? && !(false == value || true == value || nil == value || String === value || Array === value || Hash === value || Integer === value || Float === value || Fragment === value || Symbol == value)
|
|
if state.as_json
|
|
value = state.as_json.call(value)
|
|
unless false == value || true == value || nil == value || String === value || Array === value || Hash === value || Integer === value || Float === value || Fragment === value || Symbol === value
|
|
raise GeneratorError.new("#{value.class} returned by #{state.as_json} not allowed in JSON", value)
|
|
end
|
|
result << value.to_json(state)
|
|
else
|
|
raise GeneratorError.new("#{value.class} not allowed in JSON", value)
|
|
end
|
|
elsif value.respond_to?(:to_json)
|
|
result << value.to_json(state)
|
|
else
|
|
result << %{"#{String(value)}"}
|
|
end
|
|
first = false
|
|
}
|
|
depth = state.depth -= 1
|
|
result << state.array_nl
|
|
result << state.indent * depth if indent
|
|
result << ']'
|
|
end
|
|
end
|
|
|
|
module Integer
|
|
# Returns a JSON string representation for this Integer number.
|
|
def to_json(*) to_s end
|
|
end
|
|
|
|
module Float
|
|
# Returns a JSON string representation for this Float number.
|
|
def to_json(state = nil, *args)
|
|
state = State.from_state(state)
|
|
if infinite? || nan?
|
|
if state.allow_nan?
|
|
to_s
|
|
elsif state.strict? && state.as_json
|
|
casted_value = state.as_json.call(self)
|
|
|
|
if casted_value.equal?(self)
|
|
raise GeneratorError.new("#{self} not allowed in JSON", self)
|
|
end
|
|
|
|
state.check_max_nesting
|
|
state.depth += 1
|
|
result = casted_value.to_json(state, *args)
|
|
state.depth -= 1
|
|
result
|
|
else
|
|
raise GeneratorError.new("#{self} not allowed in JSON", self)
|
|
end
|
|
else
|
|
to_s
|
|
end
|
|
end
|
|
end
|
|
|
|
module Symbol
|
|
def to_json(state = nil, *args)
|
|
state = State.from_state(state)
|
|
if state.strict?
|
|
name.to_json(state, *args)
|
|
else
|
|
super
|
|
end
|
|
end
|
|
end
|
|
|
|
module String
|
|
# This string should be encoded with UTF-8 A call to this method
|
|
# returns a JSON string encoded with UTF16 big endian characters as
|
|
# \u????.
|
|
def to_json(state = nil, *args)
|
|
state = State.from_state(state)
|
|
if encoding == ::Encoding::UTF_8
|
|
unless valid_encoding?
|
|
raise GeneratorError.new("source sequence is illegal/malformed utf-8", self)
|
|
end
|
|
string = self
|
|
else
|
|
string = encode(::Encoding::UTF_8)
|
|
end
|
|
if state.ascii_only?
|
|
%("#{JSON::TruffleRuby::Generator.utf8_to_json_ascii(string, state.script_safe)}")
|
|
else
|
|
%("#{JSON::TruffleRuby::Generator.utf8_to_json(string, state.script_safe)}")
|
|
end
|
|
rescue Encoding::UndefinedConversionError => error
|
|
raise ::JSON::GeneratorError.new(error.message, self)
|
|
end
|
|
|
|
# Module that holds the extending methods if, the String module is
|
|
# included.
|
|
module Extend
|
|
# Raw Strings are JSON Objects (the raw bytes are stored in an
|
|
# array for the key "raw"). The Ruby String can be created by this
|
|
# module method.
|
|
def json_create(o)
|
|
o['raw'].pack('C*')
|
|
end
|
|
end
|
|
|
|
# Extends _modul_ with the String::Extend module.
|
|
def self.included(modul)
|
|
modul.extend Extend
|
|
end
|
|
|
|
# This method creates a raw object hash, that can be nested into
|
|
# other data structures and will be unparsed as a raw string. This
|
|
# method should be used, if you want to convert raw strings to JSON
|
|
# instead of UTF-8 strings, e. g. binary data.
|
|
def to_json_raw_object
|
|
{
|
|
JSON.create_id => self.class.name,
|
|
'raw' => self.unpack('C*'),
|
|
}
|
|
end
|
|
|
|
# This method creates a JSON text from the result of
|
|
# a call to to_json_raw_object of this String.
|
|
def to_json_raw(*args)
|
|
to_json_raw_object.to_json(*args)
|
|
end
|
|
end
|
|
|
|
module TrueClass
|
|
# Returns a JSON string for true: 'true'.
|
|
def to_json(*) 'true' end
|
|
end
|
|
|
|
module FalseClass
|
|
# Returns a JSON string for false: 'false'.
|
|
def to_json(*) 'false' end
|
|
end
|
|
|
|
module NilClass
|
|
# Returns a JSON string for nil: 'null'.
|
|
def to_json(*) 'null' end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|