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Edit File : psych.rb \| Size : 24.62 KB
# frozen_string_literal: true require_relative 'psych/versions' case RUBY_ENGINE when 'jruby' require_relative 'psych_jars' if JRuby::Util.respond_to?(:load_ext) JRuby::Util.load_ext('org.jruby.ext.psych.PsychLibrary') else require 'java'; require 'jruby' org.jruby.ext.psych.PsychLibrary.new.load(JRuby.runtime, false) end else require 'psych.so' end require_relative 'psych/nodes' require_relative 'psych/streaming' require_relative 'psych/visitors' require_relative 'psych/handler' require_relative 'psych/tree_builder' require_relative 'psych/parser' require_relative 'psych/omap' require_relative 'psych/set' require_relative 'psych/coder' require_relative 'psych/core_ext' require_relative 'psych/stream' require_relative 'psych/json/tree_builder' require_relative 'psych/json/stream' require_relative 'psych/handlers/document_stream' require_relative 'psych/class_loader' ### # = Overview # # Psych is a YAML parser and emitter. # Psych leverages libyaml [Home page: https://pyyaml.org/wiki/LibYAML] # or [git repo: https://github.com/yaml/libyaml] for its YAML parsing # and emitting capabilities. In addition to wrapping libyaml, Psych also # knows how to serialize and de-serialize most Ruby objects to and from # the YAML format. # # = I NEED TO PARSE OR EMIT YAML RIGHT NOW! # # # Parse some YAML # Psych.load("--- foo") # => "foo" # # # Emit some YAML # Psych.dump("foo") # => "--- foo\n...\n" # { :a => 'b'}.to_yaml # => "---\n:a: b\n" # # Got more time on your hands? Keep on reading! # # == YAML Parsing # # Psych provides a range of interfaces for parsing a YAML document ranging from # low level to high level, depending on your parsing needs. At the lowest # level, is an event based parser. Mid level is access to the raw YAML AST, # and at the highest level is the ability to unmarshal YAML to Ruby objects. # # == YAML Emitting # # Psych provides a range of interfaces ranging from low to high level for # producing YAML documents. Very similar to the YAML parsing interfaces, Psych # provides at the lowest level, an event based system, mid-level is building # a YAML AST, and the highest level is converting a Ruby object straight to # a YAML document. # # == High-level API # # === Parsing # # The high level YAML parser provided by Psych simply takes YAML as input and # returns a Ruby data structure. For information on using the high level parser # see Psych.load # # ==== Reading from a string # # Psych.safe_load("--- a") # => 'a' # Psych.safe_load("---\n - a\n - b") # => ['a', 'b'] # # From a trusted string: # Psych.load("--- !ruby/range\nbegin: 0\nend: 42\nexcl: false\n") # => 0..42 # # ==== Reading from a file # # Psych.safe_load_file("data.yml", permitted_classes: [Date]) # Psych.load_file("trusted_database.yml") # # ==== Exception handling # # begin # # The second argument changes only the exception contents # Psych.parse("--- `", "file.txt") # rescue Psych::SyntaxError => ex # ex.file # => 'file.txt' # ex.message # => "(file.txt): found character that cannot start any token" # end # # === Emitting # # The high level emitter has the easiest interface. Psych simply takes a Ruby # data structure and converts it to a YAML document. See Psych.dump for more # information on dumping a Ruby data structure. # # ==== Writing to a string # # # Dump an array, get back a YAML string # Psych.dump(['a', 'b']) # => "---\n- a\n- b\n" # # # Dump an array to an IO object # Psych.dump(['a', 'b'], StringIO.new) # => #<StringIO:0x000001009d0890> # # # Dump an array with indentation set # Psych.dump(['a', ['b']], :indentation => 3) # => "---\n- a\n- - b\n" # # # Dump an array to an IO with indentation set # Psych.dump(['a', ['b']], StringIO.new, :indentation => 3) # # ==== Writing to a file # # Currently there is no direct API for dumping Ruby structure to file: # # File.open('database.yml', 'w') do \|file\| # file.write(Psych.dump(['a', 'b'])) # end # # == Mid-level API # # === Parsing # # Psych provides access to an AST produced from parsing a YAML document. This # tree is built using the Psych::Parser and Psych::TreeBuilder. The AST can # be examined and manipulated freely. Please see Psych::parse_stream, # Psych::Nodes, and Psych::Nodes::Node for more information on dealing with # YAML syntax trees. # # ==== Reading from a string # # # Returns Psych::Nodes::Stream # Psych.parse_stream("---\n - a\n - b") # # # Returns Psych::Nodes::Document # Psych.parse("---\n - a\n - b") # # ==== Reading from a file # # # Returns Psych::Nodes::Stream # Psych.parse_stream(File.read('database.yml')) # # # Returns Psych::Nodes::Document # Psych.parse_file('database.yml') # # ==== Exception handling # # begin # # The second argument changes only the exception contents # Psych.parse("--- `", "file.txt") # rescue Psych::SyntaxError => ex # ex.file # => 'file.txt' # ex.message # => "(file.txt): found character that cannot start any token" # end # # === Emitting # # At the mid level is building an AST. This AST is exactly the same as the AST # used when parsing a YAML document. Users can build an AST by hand and the # AST knows how to emit itself as a YAML document. See Psych::Nodes, # Psych::Nodes::Node, and Psych::TreeBuilder for more information on building # a YAML AST. # # ==== Writing to a string # # # We need Psych::Nodes::Stream (not Psych::Nodes::Document) # stream = Psych.parse_stream("---\n - a\n - b") # # stream.to_yaml # => "---\n- a\n- b\n" # # ==== Writing to a file # # # We need Psych::Nodes::Stream (not Psych::Nodes::Document) # stream = Psych.parse_stream(File.read('database.yml')) # # File.open('database.yml', 'w') do \|file\| # file.write(stream.to_yaml) # end # # == Low-level API # # === Parsing # # The lowest level parser should be used when the YAML input is already known, # and the developer does not want to pay the price of building an AST or # automatic detection and conversion to Ruby objects. See Psych::Parser for # more information on using the event based parser. # # ==== Reading to Psych::Nodes::Stream structure # # parser = Psych::Parser.new(TreeBuilder.new) # => #<Psych::Parser> # parser = Psych.parser # it's an alias for the above # # parser.parse("---\n - a\n - b") # => #<Psych::Parser> # parser.handler # => #<Psych::TreeBuilder> # parser.handler.root # => #<Psych::Nodes::Stream> # # ==== Receiving an events stream # # recorder = Psych::Handlers::Recorder.new # parser = Psych::Parser.new(recorder) # # parser.parse("---\n - a\n - b") # recorder.events # => [list of [event, args] lists] # # event is one of: Psych::Handler::EVENTS # # args are the arguments passed to the event # # === Emitting # # The lowest level emitter is an event based system. Events are sent to a # Psych::Emitter object. That object knows how to convert the events to a YAML # document. This interface should be used when document format is known in # advance or speed is a concern. See Psych::Emitter for more information. # # ==== Writing to a Ruby structure # # Psych.parser.parse("--- a") # => #<Psych::Parser> # # parser.handler.first # => #<Psych::Nodes::Stream> # parser.handler.first.to_ruby # => ["a"] # # parser.handler.root.first # => #<Psych::Nodes::Document> # parser.handler.root.first.to_ruby # => "a" # # # You can instantiate an Emitter manually # Psych::Visitors::ToRuby.new.accept(parser.handler.root.first) # # => "a" module Psych # The version of libyaml Psych is using LIBYAML_VERSION = Psych.libyaml_version.join('.').freeze ### # Load +yaml+ in to a Ruby data structure. If multiple documents are # provided, the object contained in the first document will be returned. # +filename+ will be used in the exception message if any exception # is raised while parsing. If +yaml+ is empty, it returns # the specified +fallback+ return value, which defaults to +false+. # # Raises a Psych::SyntaxError when a YAML syntax error is detected. # # Example: # # Psych.unsafe_load("--- a") # => 'a' # Psych.unsafe_load("---\n - a\n - b") # => ['a', 'b'] # # begin # Psych.unsafe_load("--- `", filename: "file.txt") # rescue Psych::SyntaxError => ex # ex.file # => 'file.txt' # ex.message # => "(file.txt): found character that cannot start any token" # end # # When the optional +symbolize_names+ keyword argument is set to a # true value, returns symbols for keys in Hash objects (default: strings). # # Psych.unsafe_load("---\n foo: bar") # => {"foo"=>"bar"} # Psych.unsafe_load("---\n foo: bar", symbolize_names: true) # => {:foo=>"bar"} # # Raises a TypeError when `yaml` parameter is NilClass # # NOTE: This method should not be used to parse untrusted documents, such as # YAML documents that are supplied via user input. Instead, please use the # load method or the safe_load method. # def self.unsafe_load yaml, filename: nil, fallback: false, symbolize_names: false, freeze: false, strict_integer: false result = parse(yaml, filename: filename) return fallback unless result result.to_ruby(symbolize_names: symbolize_names, freeze: freeze, strict_integer: strict_integer) end ### # Safely load the yaml string in +yaml+. By default, only the following # classes are allowed to be deserialized: # # * TrueClass # * FalseClass # * NilClass # * Integer # * Float # * String # * Array # * Hash # # Recursive data structures are not allowed by default. Arbitrary classes # can be allowed by adding those classes to the +permitted_classes+ keyword argument. They are # additive. For example, to allow Date deserialization: # # Psych.safe_load(yaml, permitted_classes: [Date]) # # Now the Date class can be loaded in addition to the classes listed above. # # Aliases can be explicitly allowed by changing the +aliases+ keyword argument. # For example: # # x = [] # x << x # yaml = Psych.dump x # Psych.safe_load yaml # => raises an exception # Psych.safe_load yaml, aliases: true # => loads the aliases # # A Psych::DisallowedClass exception will be raised if the yaml contains a # class that isn't in the +permitted_classes+ list. # # A Psych::AliasesNotEnabled exception will be raised if the yaml contains aliases # but the +aliases+ keyword argument is set to false. # # +filename+ will be used in the exception message if any exception is raised # while parsing. # # When the optional +symbolize_names+ keyword argument is set to a # true value, returns symbols for keys in Hash objects (default: strings). # # Psych.safe_load("---\n foo: bar") # => {"foo"=>"bar"} # Psych.safe_load("---\n foo: bar", symbolize_names: true) # => {:foo=>"bar"} # def self.safe_load yaml, permitted_classes: [], permitted_symbols: [], aliases: false, filename: nil, fallback: nil, symbolize_names: false, freeze: false, strict_integer: false result = parse(yaml, filename: filename) return fallback unless result class_loader = ClassLoader::Restricted.new(permitted_classes.map(&:to_s), permitted_symbols.map(&:to_s)) scanner = ScalarScanner.new class_loader, strict_integer: strict_integer visitor = if aliases Visitors::ToRuby.new scanner, class_loader, symbolize_names: symbolize_names, freeze: freeze else Visitors::NoAliasRuby.new scanner, class_loader, symbolize_names: symbolize_names, freeze: freeze end result = visitor.accept result result end ### # Load +yaml+ in to a Ruby data structure. If multiple documents are # provided, the object contained in the first document will be returned. # +filename+ will be used in the exception message if any exception # is raised while parsing. If +yaml+ is empty, it returns # the specified +fallback+ return value, which defaults to +false+. # # Raises a Psych::SyntaxError when a YAML syntax error is detected. # # Example: # # Psych.load("--- a") # => 'a' # Psych.load("---\n - a\n - b") # => ['a', 'b'] # # begin # Psych.load("--- `", filename: "file.txt") # rescue Psych::SyntaxError => ex # ex.file # => 'file.txt' # ex.message # => "(file.txt): found character that cannot start any token" # end # # When the optional +symbolize_names+ keyword argument is set to a # true value, returns symbols for keys in Hash objects (default: strings). # # Psych.load("---\n foo: bar") # => {"foo"=>"bar"} # Psych.load("---\n foo: bar", symbolize_names: true) # => {:foo=>"bar"} # # Raises a TypeError when `yaml` parameter is NilClass. This method is # similar to `safe_load` except that `Symbol` objects are allowed by default. # def self.load yaml, permitted_classes: [Symbol], permitted_symbols: [], aliases: false, filename: nil, fallback: nil, symbolize_names: false, freeze: false, strict_integer: false safe_load yaml, permitted_classes: permitted_classes, permitted_symbols: permitted_symbols, aliases: aliases, filename: filename, fallback: fallback, symbolize_names: symbolize_names, freeze: freeze, strict_integer: strict_integer end ### # Parse a YAML string in +yaml+. Returns the Psych::Nodes::Document. # +filename+ is used in the exception message if a Psych::SyntaxError is # raised. # # Raises a Psych::SyntaxError when a YAML syntax error is detected. # # Example: # # Psych.parse("---\n - a\n - b") # => #<Psych::Nodes::Document:0x00> # # begin # Psych.parse("--- `", filename: "file.txt") # rescue Psych::SyntaxError => ex # ex.file # => 'file.txt' # ex.message # => "(file.txt): found character that cannot start any token" # end # # See Psych::Nodes for more information about YAML AST. def self.parse yaml, filename: nil parse_stream(yaml, filename: filename) do \|node\| return node end false end ### # Parse a file at +filename+. Returns the Psych::Nodes::Document. # # Raises a Psych::SyntaxError when a YAML syntax error is detected. def self.parse_file filename, fallback: false result = File.open filename, 'r:bom\|utf-8' do \|f\| parse f, filename: filename end result \|\| fallback end ### # Returns a default parser def self.parser Psych::Parser.new(TreeBuilder.new) end ### # Parse a YAML string in +yaml+. Returns the Psych::Nodes::Stream. # This method can handle multiple YAML documents contained in +yaml+. # +filename+ is used in the exception message if a Psych::SyntaxError is # raised. # # If a block is given, a Psych::Nodes::Document node will be yielded to the # block as it's being parsed. # # Raises a Psych::SyntaxError when a YAML syntax error is detected. # # Example: # # Psych.parse_stream("---\n - a\n - b") # => #<Psych::Nodes::Stream:0x00> # # Psych.parse_stream("--- a\n--- b") do \|node\| # node # => #<Psych::Nodes::Document:0x00> # end # # begin # Psych.parse_stream("--- `", filename: "file.txt") # rescue Psych::SyntaxError => ex # ex.file # => 'file.txt' # ex.message # => "(file.txt): found character that cannot start any token" # end # # Raises a TypeError when NilClass is passed. # # See Psych::Nodes for more information about YAML AST. def self.parse_stream yaml, filename: nil, &block if block_given? parser = Psych::Parser.new(Handlers::DocumentStream.new(&block)) parser.parse yaml, filename else parser = self.parser parser.parse yaml, filename parser.handler.root end end ### # call-seq: # Psych.dump(o) -> string of yaml # Psych.dump(o, options) -> string of yaml # Psych.dump(o, io) -> io object passed in # Psych.dump(o, io, options) -> io object passed in # # Dump Ruby object +o+ to a YAML string. Optional +options+ may be passed in # to control the output format. If an IO object is passed in, the YAML will # be dumped to that IO object. # # Currently supported options are: # # [<tt>:indentation</tt>] Number of space characters used to indent. # Acceptable value should be in <tt>0..9</tt> range, # otherwise option is ignored. # # Default: <tt>2</tt>. # [<tt>:line_width</tt>] Max character to wrap line at. # # Default: <tt>0</tt> (meaning "wrap at 81"). # [<tt>:canonical</tt>] Write "canonical" YAML form (very verbose, yet # strictly formal). # # Default: <tt>false</tt>. # [<tt>:header</tt>] Write <tt>%YAML [version]</tt> at the beginning of document. # # Default: <tt>false</tt>. # # Example: # # # Dump an array, get back a YAML string # Psych.dump(['a', 'b']) # => "---\n- a\n- b\n" # # # Dump an array to an IO object # Psych.dump(['a', 'b'], StringIO.new) # => #<StringIO:0x000001009d0890> # # # Dump an array with indentation set # Psych.dump(['a', ['b']], indentation: 3) # => "---\n- a\n- - b\n" # # # Dump an array to an IO with indentation set # Psych.dump(['a', ['b']], StringIO.new, indentation: 3) def self.dump o, io = nil, options = {} if Hash === io options = io io = nil end visitor = Psych::Visitors::YAMLTree.create options visitor << o visitor.tree.yaml io, options end ### # call-seq: # Psych.safe_dump(o) -> string of yaml # Psych.safe_dump(o, options) -> string of yaml # Psych.safe_dump(o, io) -> io object passed in # Psych.safe_dump(o, io, options) -> io object passed in # # Safely dump Ruby object +o+ to a YAML string. Optional +options+ may be passed in # to control the output format. If an IO object is passed in, the YAML will # be dumped to that IO object. By default, only the following # classes are allowed to be serialized: # # * TrueClass # * FalseClass # * NilClass # * Integer # * Float # * String # * Array # * Hash # # Arbitrary classes can be allowed by adding those classes to the +permitted_classes+ # keyword argument. They are additive. For example, to allow Date serialization: # # Psych.safe_dump(yaml, permitted_classes: [Date]) # # Now the Date class can be dumped in addition to the classes listed above. # # A Psych::DisallowedClass exception will be raised if the object contains a # class that isn't in the +permitted_classes+ list. # # Currently supported options are: # # [<tt>:indentation</tt>] Number of space characters used to indent. # Acceptable value should be in <tt>0..9</tt> range, # otherwise option is ignored. # # Default: <tt>2</tt>. # [<tt>:line_width</tt>] Max character to wrap line at. # # Default: <tt>0</tt> (meaning "wrap at 81"). # [<tt>:canonical</tt>] Write "canonical" YAML form (very verbose, yet # strictly formal). # # Default: <tt>false</tt>. # [<tt>:header</tt>] Write <tt>%YAML [version]</tt> at the beginning of document. # # Default: <tt>false</tt>. # # Example: # # # Dump an array, get back a YAML string # Psych.safe_dump(['a', 'b']) # => "---\n- a\n- b\n" # # # Dump an array to an IO object # Psych.safe_dump(['a', 'b'], StringIO.new) # => #<StringIO:0x000001009d0890> # # # Dump an array with indentation set # Psych.safe_dump(['a', ['b']], indentation: 3) # => "---\n- a\n- - b\n" # # # Dump an array to an IO with indentation set # Psych.safe_dump(['a', ['b']], StringIO.new, indentation: 3) def self.safe_dump o, io = nil, options = {} if Hash === io options = io io = nil end visitor = Psych::Visitors::RestrictedYAMLTree.create options visitor << o visitor.tree.yaml io, options end ### # Dump a list of objects as separate documents to a document stream. # # Example: # # Psych.dump_stream("foo\n ", {}) # => "--- ! \"foo\\n \"\n--- {}\n" def self.dump_stream objects visitor = Psych::Visitors::YAMLTree.create({}) objects.each do \|o\| visitor << o end visitor.tree.yaml end ### # Dump Ruby +object+ to a JSON string. def self.to_json object visitor = Psych::Visitors::JSONTree.create visitor << object visitor.tree.yaml end ### # Load multiple documents given in +yaml+. Returns the parsed documents # as a list. If a block is given, each document will be converted to Ruby # and passed to the block during parsing # # Example: # # Psych.load_stream("--- foo\n...\n--- bar\n...") # => ['foo', 'bar'] # # list = [] # Psych.load_stream("--- foo\n...\n--- bar\n...") do \|ruby\| # list << ruby # end # list # => ['foo', 'bar'] # def self.load_stream yaml, filename: nil, fallback: [], kwargs result = if block_given? parse_stream(yaml, filename: filename) do \|node\| yield node.to_ruby(kwargs) end else parse_stream(yaml, filename: filename).children.map { \|node\| node.to_ruby(kwargs) } end return fallback if result.is_a?(Array) && result.empty? result end ### # Load the document contained in +filename+. Returns the yaml contained in # +filename+ as a Ruby object, or if the file is empty, it returns # the specified +fallback+ return value, which defaults to +false+. # # NOTE: This method should not* be used to parse untrusted documents, such as # YAML documents that are supplied via user input. Instead, please use the # safe_load_file method. def self.unsafe_load_file filename, kwargs File.open(filename, 'r:bom\|utf-8') { \|f\| self.unsafe_load f, filename: filename, kwargs } end ### # Safely loads the document contained in +filename+. Returns the yaml contained in # +filename+ as a Ruby object, or if the file is empty, it returns # the specified +fallback+ return value, which defaults to +false+. # See safe_load for options. def self.safe_load_file filename, kwargs File.open(filename, 'r:bom\|utf-8') { \|f\| self.safe_load f, filename: filename, kwargs } end ### # Loads the document contained in +filename+. Returns the yaml contained in # +filename+ as a Ruby object, or if the file is empty, it returns # the specified +fallback+ return value, which defaults to +false+. # See load for options. def self.load_file filename, kwargs File.open(filename, 'r:bom\|utf-8') { \|f\| self.load f, filename: filename, kwargs } end # :stopdoc: def self.add_domain_type domain, type_tag, &block key = ['tag', domain, type_tag].join ':' domain_types[key] = [key, block] domain_types["tag:#{type_tag}"] = [key, block] end def self.add_builtin_type type_tag, &block domain = 'yaml.org,2002' key = ['tag', domain, type_tag].join ':' domain_types[key] = [key, block] end def self.remove_type type_tag domain_types.delete type_tag end def self.add_tag tag, klass load_tags[tag] = klass.name dump_tags[klass] = tag end # Workaround for emulating `warn '...', uplevel: 1` in Ruby 2.4 or lower. def self.warn_with_uplevel(message, uplevel: 1) at = parse_caller(caller[uplevel]).join(':') warn "#{at}: #{message}" end def self.parse_caller(at) if /^(.+?):(\d+)(?::in `.*')?/ =~ at file = $1 line = $2.to_i [file, line] end end private_class_method :warn_with_uplevel, :parse_caller class << self if defined?(Ractor) require 'forwardable' extend Forwardable class Config attr_accessor :load_tags, :dump_tags, :domain_types def initialize @load_tags = {} @dump_tags = {} @domain_types = {} end end def config Ractor.current[:PsychConfig] \|\|= Config.new end def_delegators :config, :load_tags, :dump_tags, :domain_types, :load_tags=, :dump_tags=, :domain_types= else attr_accessor :load_tags attr_accessor :dump_tags attr_accessor :domain_types end end self.load_tags = {} self.dump_tags = {} self.domain_types = {} # :startdoc: end Back

Edit File : psych.rb | Size : 24.62 KB

# frozen_string_literal: true
require_relative 'psych/versions'
case RUBY_ENGINE
when 'jruby'
  require_relative 'psych_jars'
  if JRuby::Util.respond_to?(:load_ext)
    JRuby::Util.load_ext('org.jruby.ext.psych.PsychLibrary')
  else
    require 'java'; require 'jruby'
    org.jruby.ext.psych.PsychLibrary.new.load(JRuby.runtime, false)
  end
else
  require 'psych.so'
end
require_relative 'psych/nodes'
require_relative 'psych/streaming'
require_relative 'psych/visitors'
require_relative 'psych/handler'
require_relative 'psych/tree_builder'
require_relative 'psych/parser'
require_relative 'psych/omap'
require_relative 'psych/set'
require_relative 'psych/coder'
require_relative 'psych/core_ext'
require_relative 'psych/stream'
require_relative 'psych/json/tree_builder'
require_relative 'psych/json/stream'
require_relative 'psych/handlers/document_stream'
require_relative 'psych/class_loader'

###
# = Overview
#
# Psych is a YAML parser and emitter.
# Psych leverages libyaml [Home page: https://pyyaml.org/wiki/LibYAML]
# or [git repo: https://github.com/yaml/libyaml] for its YAML parsing
# and emitting capabilities. In addition to wrapping libyaml, Psych also
# knows how to serialize and de-serialize most Ruby objects to and from
# the YAML format.
#
# = I NEED TO PARSE OR EMIT YAML RIGHT NOW!
#
#   # Parse some YAML
#   Psych.load("--- foo") # => "foo"
#
#   # Emit some YAML
#   Psych.dump("foo")     # => "--- foo\n...\n"
#   { :a => 'b'}.to_yaml  # => "---\n:a: b\n"
#
# Got more time on your hands?  Keep on reading!
#
# == YAML Parsing
#
# Psych provides a range of interfaces for parsing a YAML document ranging from
# low level to high level, depending on your parsing needs.  At the lowest
# level, is an event based parser.  Mid level is access to the raw YAML AST,
# and at the highest level is the ability to unmarshal YAML to Ruby objects.
#
# == YAML Emitting
#
# Psych provides a range of interfaces ranging from low to high level for
# producing YAML documents.  Very similar to the YAML parsing interfaces, Psych
# provides at the lowest level, an event based system, mid-level is building
# a YAML AST, and the highest level is converting a Ruby object straight to
# a YAML document.
#
# == High-level API
#
# === Parsing
#
# The high level YAML parser provided by Psych simply takes YAML as input and
# returns a Ruby data structure.  For information on using the high level parser
# see Psych.load
#
# ==== Reading from a string
#
#   Psych.safe_load("--- a")             # => 'a'
#   Psych.safe_load("---\n - a\n - b")   # => ['a', 'b']
#   # From a trusted string:
#   Psych.load("--- !ruby/range\nbegin: 0\nend: 42\nexcl: false\n") # => 0..42
#
# ==== Reading from a file
#
#   Psych.safe_load_file("data.yml", permitted_classes: [Date])
#   Psych.load_file("trusted_database.yml")
#
# ==== Exception handling
#
#   begin
#     # The second argument changes only the exception contents
#     Psych.parse("--- `", "file.txt")
#   rescue Psych::SyntaxError => ex
#     ex.file    # => 'file.txt'
#     ex.message # => "(file.txt): found character that cannot start any token"
#   end
#
# === Emitting
#
# The high level emitter has the easiest interface.  Psych simply takes a Ruby
# data structure and converts it to a YAML document.  See Psych.dump for more
# information on dumping a Ruby data structure.
#
# ==== Writing to a string
#
#   # Dump an array, get back a YAML string
#   Psych.dump(['a', 'b'])  # => "---\n- a\n- b\n"
#
#   # Dump an array to an IO object
#   Psych.dump(['a', 'b'], StringIO.new)  # => #<StringIO:0x000001009d0890>
#
#   # Dump an array with indentation set
#   Psych.dump(['a', ['b']], :indentation => 3) # => "---\n- a\n-  - b\n"
#
#   # Dump an array to an IO with indentation set
#   Psych.dump(['a', ['b']], StringIO.new, :indentation => 3)
#
# ==== Writing to a file
#
# Currently there is no direct API for dumping Ruby structure to file:
#
#   File.open('database.yml', 'w') do |file|
#     file.write(Psych.dump(['a', 'b']))
#   end
#
# == Mid-level API
#
# === Parsing
#
# Psych provides access to an AST produced from parsing a YAML document.  This
# tree is built using the Psych::Parser and Psych::TreeBuilder.  The AST can
# be examined and manipulated freely.  Please see Psych::parse_stream,
# Psych::Nodes, and Psych::Nodes::Node for more information on dealing with
# YAML syntax trees.
#
# ==== Reading from a string
#
#   # Returns Psych::Nodes::Stream
#   Psych.parse_stream("---\n - a\n - b")
#
#   # Returns Psych::Nodes::Document
#   Psych.parse("---\n - a\n - b")
#
# ==== Reading from a file
#
#   # Returns Psych::Nodes::Stream
#   Psych.parse_stream(File.read('database.yml'))
#
#   # Returns Psych::Nodes::Document
#   Psych.parse_file('database.yml')
#
# ==== Exception handling
#
#   begin
#     # The second argument changes only the exception contents
#     Psych.parse("--- `", "file.txt")
#   rescue Psych::SyntaxError => ex
#     ex.file    # => 'file.txt'
#     ex.message # => "(file.txt): found character that cannot start any token"
#   end
#
# === Emitting
#
# At the mid level is building an AST.  This AST is exactly the same as the AST
# used when parsing a YAML document.  Users can build an AST by hand and the
# AST knows how to emit itself as a YAML document.  See Psych::Nodes,
# Psych::Nodes::Node, and Psych::TreeBuilder for more information on building
# a YAML AST.
#
# ==== Writing to a string
#
#   # We need Psych::Nodes::Stream (not Psych::Nodes::Document)
#   stream = Psych.parse_stream("---\n - a\n - b")
#
#   stream.to_yaml # => "---\n- a\n- b\n"
#
# ==== Writing to a file
#
#   # We need Psych::Nodes::Stream (not Psych::Nodes::Document)
#   stream = Psych.parse_stream(File.read('database.yml'))
#
#   File.open('database.yml', 'w') do |file|
#     file.write(stream.to_yaml)
#   end
#
# == Low-level API
#
# === Parsing
#
# The lowest level parser should be used when the YAML input is already known,
# and the developer does not want to pay the price of building an AST or
# automatic detection and conversion to Ruby objects.  See Psych::Parser for
# more information on using the event based parser.
#
# ==== Reading to Psych::Nodes::Stream structure
#
#   parser = Psych::Parser.new(TreeBuilder.new) # => #<Psych::Parser>
#   parser = Psych.parser                       # it's an alias for the above
#
#   parser.parse("---\n - a\n - b")             # => #<Psych::Parser>
#   parser.handler                              # => #<Psych::TreeBuilder>
#   parser.handler.root                         # => #<Psych::Nodes::Stream>
#
# ==== Receiving an events stream
#
#   recorder = Psych::Handlers::Recorder.new
#   parser = Psych::Parser.new(recorder)
#
#   parser.parse("---\n - a\n - b")
#   recorder.events # => [list of [event, args] lists]
#                   # event is one of: Psych::Handler::EVENTS
#                   # args are the arguments passed to the event
#
# === Emitting
#
# The lowest level emitter is an event based system.  Events are sent to a
# Psych::Emitter object.  That object knows how to convert the events to a YAML
# document.  This interface should be used when document format is known in
# advance or speed is a concern.  See Psych::Emitter for more information.
#
# ==== Writing to a Ruby structure
#
#   Psych.parser.parse("--- a")       # => #<Psych::Parser>
#
#   parser.handler.first              # => #<Psych::Nodes::Stream>
#   parser.handler.first.to_ruby      # => ["a"]
#
#   parser.handler.root.first         # => #<Psych::Nodes::Document>
#   parser.handler.root.first.to_ruby # => "a"
#
#   # You can instantiate an Emitter manually
#   Psych::Visitors::ToRuby.new.accept(parser.handler.root.first)
#   # => "a"

module Psych
  # The version of libyaml Psych is using
  LIBYAML_VERSION = Psych.libyaml_version.join('.').freeze

###
  # Load +yaml+ in to a Ruby data structure.  If multiple documents are
  # provided, the object contained in the first document will be returned.
  # +filename+ will be used in the exception message if any exception
  # is raised while parsing.  If +yaml+ is empty, it returns
  # the specified +fallback+ return value, which defaults to +false+.
  #
  # Raises a Psych::SyntaxError when a YAML syntax error is detected.
  #
  # Example:
  #
  #   Psych.unsafe_load("--- a")             # => 'a'
  #   Psych.unsafe_load("---\n - a\n - b")   # => ['a', 'b']
  #
  #   begin
  #     Psych.unsafe_load("--- `", filename: "file.txt")
  #   rescue Psych::SyntaxError => ex
  #     ex.file    # => 'file.txt'
  #     ex.message # => "(file.txt): found character that cannot start any token"
  #   end
  #
  # When the optional +symbolize_names+ keyword argument is set to a
  # true value, returns symbols for keys in Hash objects (default: strings).
  #
  #   Psych.unsafe_load("---\n foo: bar")                         # => {"foo"=>"bar"}
  #   Psych.unsafe_load("---\n foo: bar", symbolize_names: true)  # => {:foo=>"bar"}
  #
  # Raises a TypeError when `yaml` parameter is NilClass
  #
  # NOTE: This method *should not* be used to parse untrusted documents, such as
  # YAML documents that are supplied via user input.  Instead, please use the
  # load method or the safe_load method.
  #
  def self.unsafe_load yaml, filename: nil, fallback: false, symbolize_names: false, freeze: false, strict_integer: false
    result = parse(yaml, filename: filename)
    return fallback unless result
    result.to_ruby(symbolize_names: symbolize_names, freeze: freeze, strict_integer: strict_integer)
  end

###
  # Safely load the yaml string in +yaml+.  By default, only the following
  # classes are allowed to be deserialized:
  #
  # * TrueClass
  # * FalseClass
  # * NilClass
  # * Integer
  # * Float
  # * String
  # * Array
  # * Hash
  #
  # Recursive data structures are not allowed by default.  Arbitrary classes
  # can be allowed by adding those classes to the +permitted_classes+ keyword argument.  They are
  # additive.  For example, to allow Date deserialization:
  #
  #   Psych.safe_load(yaml, permitted_classes: [Date])
  #
  # Now the Date class can be loaded in addition to the classes listed above.
  #
  # Aliases can be explicitly allowed by changing the +aliases+ keyword argument.
  # For example:
  #
  #   x = []
  #   x << x
  #   yaml = Psych.dump x
  #   Psych.safe_load yaml               # => raises an exception
  #   Psych.safe_load yaml, aliases: true # => loads the aliases
  #
  # A Psych::DisallowedClass exception will be raised if the yaml contains a
  # class that isn't in the +permitted_classes+ list.
  #
  # A Psych::AliasesNotEnabled exception will be raised if the yaml contains aliases
  # but the +aliases+ keyword argument is set to false.
  #
  # +filename+ will be used in the exception message if any exception is raised
  # while parsing.
  #
  # When the optional +symbolize_names+ keyword argument is set to a
  # true value, returns symbols for keys in Hash objects (default: strings).
  #
  #   Psych.safe_load("---\n foo: bar")                         # => {"foo"=>"bar"}
  #   Psych.safe_load("---\n foo: bar", symbolize_names: true)  # => {:foo=>"bar"}
  #
  def self.safe_load yaml, permitted_classes: [], permitted_symbols: [], aliases: false, filename: nil, fallback: nil, symbolize_names: false, freeze: false, strict_integer: false
    result = parse(yaml, filename: filename)
    return fallback unless result

class_loader = ClassLoader::Restricted.new(permitted_classes.map(&:to_s),
                                               permitted_symbols.map(&:to_s))
    scanner      = ScalarScanner.new class_loader, strict_integer: strict_integer
    visitor = if aliases
                Visitors::ToRuby.new scanner, class_loader, symbolize_names: symbolize_names, freeze: freeze
              else
                Visitors::NoAliasRuby.new scanner, class_loader, symbolize_names: symbolize_names, freeze: freeze
              end
    result = visitor.accept result
    result
  end

###
  # Load +yaml+ in to a Ruby data structure.  If multiple documents are
  # provided, the object contained in the first document will be returned.
  # +filename+ will be used in the exception message if any exception
  # is raised while parsing.  If +yaml+ is empty, it returns
  # the specified +fallback+ return value, which defaults to +false+.
  #
  # Raises a Psych::SyntaxError when a YAML syntax error is detected.
  #
  # Example:
  #
  #   Psych.load("--- a")             # => 'a'
  #   Psych.load("---\n - a\n - b")   # => ['a', 'b']
  #
  #   begin
  #     Psych.load("--- `", filename: "file.txt")
  #   rescue Psych::SyntaxError => ex
  #     ex.file    # => 'file.txt'
  #     ex.message # => "(file.txt): found character that cannot start any token"
  #   end
  #
  # When the optional +symbolize_names+ keyword argument is set to a
  # true value, returns symbols for keys in Hash objects (default: strings).
  #
  #   Psych.load("---\n foo: bar")                         # => {"foo"=>"bar"}
  #   Psych.load("---\n foo: bar", symbolize_names: true)  # => {:foo=>"bar"}
  #
  # Raises a TypeError when `yaml` parameter is NilClass.  This method is
  # similar to `safe_load` except that `Symbol` objects are allowed by default.
  #
  def self.load yaml, permitted_classes: [Symbol], permitted_symbols: [], aliases: false, filename: nil, fallback: nil, symbolize_names: false, freeze: false, strict_integer: false
    safe_load yaml, permitted_classes: permitted_classes,
                    permitted_symbols: permitted_symbols,
                    aliases: aliases,
                    filename: filename,
                    fallback: fallback,
                    symbolize_names: symbolize_names,
                    freeze: freeze,
                    strict_integer: strict_integer
  end

###
  # Parse a YAML string in +yaml+.  Returns the Psych::Nodes::Document.
  # +filename+ is used in the exception message if a Psych::SyntaxError is
  # raised.
  #
  # Raises a Psych::SyntaxError when a YAML syntax error is detected.
  #
  # Example:
  #
  #   Psych.parse("---\n - a\n - b") # => #<Psych::Nodes::Document:0x00>
  #
  #   begin
  #     Psych.parse("--- `", filename: "file.txt")
  #   rescue Psych::SyntaxError => ex
  #     ex.file    # => 'file.txt'
  #     ex.message # => "(file.txt): found character that cannot start any token"
  #   end
  #
  # See Psych::Nodes for more information about YAML AST.
  def self.parse yaml, filename: nil
    parse_stream(yaml, filename: filename) do |node|
      return node
    end

false
  end

###
  # Parse a file at +filename+. Returns the Psych::Nodes::Document.
  #
  # Raises a Psych::SyntaxError when a YAML syntax error is detected.
  def self.parse_file filename, fallback: false
    result = File.open filename, 'r:bom|utf-8' do |f|
      parse f, filename: filename
    end
    result || fallback
  end

###
  # Returns a default parser
  def self.parser
    Psych::Parser.new(TreeBuilder.new)
  end

###
  # Parse a YAML string in +yaml+.  Returns the Psych::Nodes::Stream.
  # This method can handle multiple YAML documents contained in +yaml+.
  # +filename+ is used in the exception message if a Psych::SyntaxError is
  # raised.
  #
  # If a block is given, a Psych::Nodes::Document node will be yielded to the
  # block as it's being parsed.
  #
  # Raises a Psych::SyntaxError when a YAML syntax error is detected.
  #
  # Example:
  #
  #   Psych.parse_stream("---\n - a\n - b") # => #<Psych::Nodes::Stream:0x00>
  #
  #   Psych.parse_stream("--- a\n--- b") do |node|
  #     node # => #<Psych::Nodes::Document:0x00>
  #   end
  #
  #   begin
  #     Psych.parse_stream("--- `", filename: "file.txt")
  #   rescue Psych::SyntaxError => ex
  #     ex.file    # => 'file.txt'
  #     ex.message # => "(file.txt): found character that cannot start any token"
  #   end
  #
  # Raises a TypeError when NilClass is passed.
  #
  # See Psych::Nodes for more information about YAML AST.
  def self.parse_stream yaml, filename: nil, &block
    if block_given?
      parser = Psych::Parser.new(Handlers::DocumentStream.new(&block))
      parser.parse yaml, filename
    else
      parser = self.parser
      parser.parse yaml, filename
      parser.handler.root
    end
  end

###
  # call-seq:
  #   Psych.dump(o)               -> string of yaml
  #   Psych.dump(o, options)      -> string of yaml
  #   Psych.dump(o, io)           -> io object passed in
  #   Psych.dump(o, io, options)  -> io object passed in
  #
  # Dump Ruby object +o+ to a YAML string.  Optional +options+ may be passed in
  # to control the output format.  If an IO object is passed in, the YAML will
  # be dumped to that IO object.
  #
  # Currently supported options are:
  #
  # [<tt>:indentation</tt>]   Number of space characters used to indent.
  #                           Acceptable value should be in <tt>0..9</tt> range,
  #                           otherwise option is ignored.
  #
  #                           Default: <tt>2</tt>.
  # [<tt>:line_width</tt>]    Max character to wrap line at.
  #
  #                           Default: <tt>0</tt> (meaning "wrap at 81").
  # [<tt>:canonical</tt>]     Write "canonical" YAML form (very verbose, yet
  #                           strictly formal).
  #
  #                           Default: <tt>false</tt>.
  # [<tt>:header</tt>]        Write <tt>%YAML [version]</tt> at the beginning of document.
  #
  #                           Default: <tt>false</tt>.
  #
  # Example:
  #
  #   # Dump an array, get back a YAML string
  #   Psych.dump(['a', 'b'])  # => "---\n- a\n- b\n"
  #
  #   # Dump an array to an IO object
  #   Psych.dump(['a', 'b'], StringIO.new)  # => #<StringIO:0x000001009d0890>
  #
  #   # Dump an array with indentation set
  #   Psych.dump(['a', ['b']], indentation: 3) # => "---\n- a\n-  - b\n"
  #
  #   # Dump an array to an IO with indentation set
  #   Psych.dump(['a', ['b']], StringIO.new, indentation: 3)
  def self.dump o, io = nil, options = {}
    if Hash === io
      options = io
      io      = nil
    end

visitor = Psych::Visitors::YAMLTree.create options
    visitor << o
    visitor.tree.yaml io, options
  end

###
  # call-seq:
  #   Psych.safe_dump(o)               -> string of yaml
  #   Psych.safe_dump(o, options)      -> string of yaml
  #   Psych.safe_dump(o, io)           -> io object passed in
  #   Psych.safe_dump(o, io, options)  -> io object passed in
  #
  # Safely dump Ruby object +o+ to a YAML string. Optional +options+ may be passed in
  # to control the output format.  If an IO object is passed in, the YAML will
  # be dumped to that IO object. By default, only the following
  # classes are allowed to be serialized:
  #
  # * TrueClass
  # * FalseClass
  # * NilClass
  # * Integer
  # * Float
  # * String
  # * Array
  # * Hash
  #
  # Arbitrary classes can be allowed by adding those classes to the +permitted_classes+
  # keyword argument.  They are additive.  For example, to allow Date serialization:
  #
  #   Psych.safe_dump(yaml, permitted_classes: [Date])
  #
  # Now the Date class can be dumped in addition to the classes listed above.
  #
  # A Psych::DisallowedClass exception will be raised if the object contains a
  # class that isn't in the +permitted_classes+ list.
  #
  # Currently supported options are:
  #
  # [<tt>:indentation</tt>]   Number of space characters used to indent.
  #                           Acceptable value should be in <tt>0..9</tt> range,
  #                           otherwise option is ignored.
  #
  #                           Default: <tt>2</tt>.
  # [<tt>:line_width</tt>]    Max character to wrap line at.
  #
  #                           Default: <tt>0</tt> (meaning "wrap at 81").
  # [<tt>:canonical</tt>]     Write "canonical" YAML form (very verbose, yet
  #                           strictly formal).
  #
  #                           Default: <tt>false</tt>.
  # [<tt>:header</tt>]        Write <tt>%YAML [version]</tt> at the beginning of document.
  #
  #                           Default: <tt>false</tt>.
  #
  # Example:
  #
  #   # Dump an array, get back a YAML string
  #   Psych.safe_dump(['a', 'b'])  # => "---\n- a\n- b\n"
  #
  #   # Dump an array to an IO object
  #   Psych.safe_dump(['a', 'b'], StringIO.new)  # => #<StringIO:0x000001009d0890>
  #
  #   # Dump an array with indentation set
  #   Psych.safe_dump(['a', ['b']], indentation: 3) # => "---\n- a\n-  - b\n"
  #
  #   # Dump an array to an IO with indentation set
  #   Psych.safe_dump(['a', ['b']], StringIO.new, indentation: 3)
  def self.safe_dump o, io = nil, options = {}
    if Hash === io
      options = io
      io      = nil
    end

visitor = Psych::Visitors::RestrictedYAMLTree.create options
    visitor << o
    visitor.tree.yaml io, options
  end

###
  # Dump a list of objects as separate documents to a document stream.
  #
  # Example:
  #
  #   Psych.dump_stream("foo\n  ", {}) # => "--- ! \"foo\\n  \"\n--- {}\n"
  def self.dump_stream *objects
    visitor = Psych::Visitors::YAMLTree.create({})
    objects.each do |o|
      visitor << o
    end
    visitor.tree.yaml
  end

###
  # Dump Ruby +object+ to a JSON string.
  def self.to_json object
    visitor = Psych::Visitors::JSONTree.create
    visitor << object
    visitor.tree.yaml
  end

###
  # Load multiple documents given in +yaml+.  Returns the parsed documents
  # as a list.  If a block is given, each document will be converted to Ruby
  # and passed to the block during parsing
  #
  # Example:
  #
  #   Psych.load_stream("--- foo\n...\n--- bar\n...") # => ['foo', 'bar']
  #
  #   list = []
  #   Psych.load_stream("--- foo\n...\n--- bar\n...") do |ruby|
  #     list << ruby
  #   end
  #   list # => ['foo', 'bar']
  #
  def self.load_stream yaml, filename: nil, fallback: [], **kwargs
    result = if block_given?
               parse_stream(yaml, filename: filename) do |node|
                 yield node.to_ruby(**kwargs)
               end
             else
               parse_stream(yaml, filename: filename).children.map { |node| node.to_ruby(**kwargs) }
             end

return fallback if result.is_a?(Array) && result.empty?
    result
  end

###
  # Load the document contained in +filename+.  Returns the yaml contained in
  # +filename+ as a Ruby object, or if the file is empty, it returns
  # the specified +fallback+ return value, which defaults to +false+.
  #
  # NOTE: This method *should not* be used to parse untrusted documents, such as
  # YAML documents that are supplied via user input.  Instead, please use the
  # safe_load_file method.
  def self.unsafe_load_file filename, **kwargs
    File.open(filename, 'r:bom|utf-8') { |f|
      self.unsafe_load f, filename: filename, **kwargs
    }
  end

###
  # Safely loads the document contained in +filename+.  Returns the yaml contained in
  # +filename+ as a Ruby object, or if the file is empty, it returns
  # the specified +fallback+ return value, which defaults to +false+.
  # See safe_load for options.
  def self.safe_load_file filename, **kwargs
    File.open(filename, 'r:bom|utf-8') { |f|
      self.safe_load f, filename: filename, **kwargs
    }
  end

###
  # Loads the document contained in +filename+.  Returns the yaml contained in
  # +filename+ as a Ruby object, or if the file is empty, it returns
  # the specified +fallback+ return value, which defaults to +false+.
  # See load for options.
  def self.load_file filename, **kwargs
    File.open(filename, 'r:bom|utf-8') { |f|
      self.load f, filename: filename, **kwargs
    }
  end

# :stopdoc:
  def self.add_domain_type domain, type_tag, &block
    key = ['tag', domain, type_tag].join ':'
    domain_types[key] = [key, block]
    domain_types["tag:#{type_tag}"] = [key, block]
  end

def self.add_builtin_type type_tag, &block
    domain = 'yaml.org,2002'
    key = ['tag', domain, type_tag].join ':'
    domain_types[key] = [key, block]
  end

def self.remove_type type_tag
    domain_types.delete type_tag
  end

def self.add_tag tag, klass
    load_tags[tag] = klass.name
    dump_tags[klass] = tag
  end

# Workaround for emulating `warn '...', uplevel: 1` in Ruby 2.4 or lower.
  def self.warn_with_uplevel(message, uplevel: 1)
    at = parse_caller(caller[uplevel]).join(':')
    warn "#{at}: #{message}"
  end

def self.parse_caller(at)
    if /^(.+?):(\d+)(?::in `.*')?/ =~ at
      file = $1
      line = $2.to_i
      [file, line]
    end
  end
  private_class_method :warn_with_uplevel, :parse_caller

class << self
    if defined?(Ractor)
      require 'forwardable'
      extend Forwardable

class Config
        attr_accessor :load_tags, :dump_tags, :domain_types
        def initialize
          @load_tags = {}
          @dump_tags = {}
          @domain_types = {}
        end
      end

def config
        Ractor.current[:PsychConfig] ||= Config.new
      end

def_delegators :config, :load_tags, :dump_tags, :domain_types, :load_tags=, :dump_tags=, :domain_types=
    else
      attr_accessor :load_tags
      attr_accessor :dump_tags
      attr_accessor :domain_types
    end
  end
  self.load_tags = {}
  self.dump_tags = {}
  self.domain_types = {}
  # :startdoc:
end

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