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Edit File : yaml.rb \| Size : 12.36 KB
# -- mode: ruby; ruby-indent-level: 4; tab-width: 4 -- vim: sw=4 ts=4 # $Id: yaml.rb 16084 2008-04-19 11:45:39Z knu $ # # = yaml.rb: top-level module with methods for loading and parsing YAML documents # # Author:: why the lucky stiff # require 'stringio' require 'yaml/error' require 'yaml/syck' require 'yaml/tag' require 'yaml/stream' require 'yaml/constants' # == YAML # # YAML(tm) (rhymes with 'camel') is a # straightforward machine parsable data serialization format designed for # human readability and interaction with scripting languages such as Perl # and Python. YAML is optimized for data serialization, formatted # dumping, configuration files, log files, Internet messaging and # filtering. This specification describes the YAML information model and # serialization format. Together with the Unicode standard for characters, it # provides all the information necessary to understand YAML Version 1.0 # and construct computer programs to process it. # # See http://yaml.org/ for more information. For a quick tutorial, please # visit YAML In Five Minutes (http://yaml.kwiki.org/?YamlInFiveMinutes). # # == About This Library # # The YAML 1.0 specification outlines four stages of YAML loading and dumping. # This library honors all four of those stages, although data is really only # available to you in three stages. # # The four stages are: native, representation, serialization, and presentation. # # The native stage refers to data which has been loaded completely into Ruby's # own types. (See +YAML::load+.) # # The representation stage means data which has been composed into # +YAML::BaseNode+ objects. In this stage, the document is available as a # tree of node objects. You can perform YPath queries and transformations # at this level. (See +YAML::parse+.) # # The serialization stage happens inside the parser. The YAML parser used in # Ruby is called Syck. Serialized nodes are available in the extension as # SyckNode structs. # # The presentation stage is the YAML document itself. This is accessible # to you as a string. (See +YAML::dump+.) # # For more information about the various information models, see Chapter # 3 of the YAML 1.0 Specification (http://yaml.org/spec/#id2491269). # # The YAML module provides quick access to the most common loading (YAML::load) # and dumping (YAML::dump) tasks. This module also provides an API for registering # global types (YAML::add_domain_type). # # == Example # # A simple round-trip (load and dump) of an object. # # require "yaml" # # test_obj = ["dogs", "cats", "badgers"] # # yaml_obj = YAML::dump( test_obj ) # # -> --- # - dogs # - cats # - badgers # ruby_obj = YAML::load( yaml_obj ) # # => ["dogs", "cats", "badgers"] # ruby_obj == test_obj # # => true # # To register your custom types with the global resolver, use +add_domain_type+. # # YAML::add_domain_type( "your-site.com,2004", "widget" ) do \|type, val\| # Widget.new( val ) # end # module YAML Resolver = YAML::Syck::Resolver DefaultResolver = YAML::Syck::DefaultResolver DefaultResolver.use_types_at( @@tagged_classes ) GenericResolver = YAML::Syck::GenericResolver Parser = YAML::Syck::Parser Emitter = YAML::Syck::Emitter # Returns a new default parser def YAML.parser; Parser.new.set_resolver( YAML.resolver ); end # Returns a new generic parser def YAML.generic_parser; Parser.new.set_resolver( GenericResolver ); end # Returns the default resolver def YAML.resolver; DefaultResolver; end # Returns a new default emitter def YAML.emitter; Emitter.new.set_resolver( YAML.resolver ); end # # Converts _obj_ to YAML and writes the YAML result to _io_. # # File.open( 'animals.yaml', 'w' ) do \|out\| # YAML.dump( ['badger', 'elephant', 'tiger'], out ) # end # # If no _io_ is provided, a string containing the dumped YAML # is returned. # # YAML.dump( :locked ) # #=> "--- :locked" # def YAML.dump( obj, io = nil ) obj.to_yaml( io \|\| io2 = StringIO.new ) io \|\| ( io2.rewind; io2.read ) end # # Load a document from the current _io_ stream. # # File.open( 'animals.yaml' ) { \|yf\| YAML::load( yf ) } # #=> ['badger', 'elephant', 'tiger'] # # Can also load from a string. # # YAML.load( "--- :locked" ) # #=> :locked # def YAML.load( io ) yp = parser.load( io ) end # # Load a document from the file located at _filepath_. # # YAML.load_file( 'animals.yaml' ) # #=> ['badger', 'elephant', 'tiger'] # def YAML.load_file( filepath ) File.open( filepath ) do \|f\| load( f ) end end # # Parse the first document from the current _io_ stream # # File.open( 'animals.yaml' ) { \|yf\| YAML::load( yf ) } # #=> #<YAML::Syck::Node:0x82ccce0 # @kind=:seq, # @value= # [#<YAML::Syck::Node:0x82ccd94 # @kind=:scalar, # @type_id="str", # @value="badger">, # #<YAML::Syck::Node:0x82ccd58 # @kind=:scalar, # @type_id="str", # @value="elephant">, # #<YAML::Syck::Node:0x82ccd1c # @kind=:scalar, # @type_id="str", # @value="tiger">]> # # Can also load from a string. # # YAML.parse( "--- :locked" ) # #=> #<YAML::Syck::Node:0x82edddc # @type_id="tag:ruby.yaml.org,2002:sym", # @value=":locked", @kind=:scalar> # def YAML.parse( io ) yp = generic_parser.load( io ) end # # Parse a document from the file located at _filepath_. # # YAML.parse_file( 'animals.yaml' ) # #=> #<YAML::Syck::Node:0x82ccce0 # @kind=:seq, # @value= # [#<YAML::Syck::Node:0x82ccd94 # @kind=:scalar, # @type_id="str", # @value="badger">, # #<YAML::Syck::Node:0x82ccd58 # @kind=:scalar, # @type_id="str", # @value="elephant">, # #<YAML::Syck::Node:0x82ccd1c # @kind=:scalar, # @type_id="str", # @value="tiger">]> # def YAML.parse_file( filepath ) File.open( filepath ) do \|f\| parse( f ) end end # # Calls _block_ with each consecutive document in the YAML # stream contained in _io_. # # File.open( 'many-docs.yaml' ) do \|yf\| # YAML.each_document( yf ) do \|ydoc\| # ## ydoc contains the single object # ## from the YAML document # end # end # def YAML.each_document( io, &block ) yp = parser.load_documents( io, &block ) end # # Calls _block_ with each consecutive document in the YAML # stream contained in _io_. # # File.open( 'many-docs.yaml' ) do \|yf\| # YAML.load_documents( yf ) do \|ydoc\| # ## ydoc contains the single object # ## from the YAML document # end # end # def YAML.load_documents( io, &doc_proc ) YAML.each_document( io, &doc_proc ) end # # Calls _block_ with a tree of +YAML::BaseNodes+, one tree for # each consecutive document in the YAML stream contained in _io_. # # File.open( 'many-docs.yaml' ) do \|yf\| # YAML.each_node( yf ) do \|ydoc\| # ## ydoc contains a tree of nodes # ## from the YAML document # end # end # def YAML.each_node( io, &doc_proc ) yp = generic_parser.load_documents( io, &doc_proc ) end # # Calls _block_ with a tree of +YAML::BaseNodes+, one tree for # each consecutive document in the YAML stream contained in _io_. # # File.open( 'many-docs.yaml' ) do \|yf\| # YAML.parse_documents( yf ) do \|ydoc\| # ## ydoc contains a tree of nodes # ## from the YAML document # end # end # def YAML.parse_documents( io, &doc_proc ) YAML.each_node( io, &doc_proc ) end # # Loads all documents from the current _io_ stream, # returning a +YAML::Stream+ object containing all # loaded documents. # def YAML.load_stream( io ) d = nil parser.load_documents( io ) do \|doc\| d = YAML::Stream.new if not d d.add( doc ) end return d end # # Returns a YAML stream containing each of the items in +objs+, # each having their own document. # # YAML.dump_stream( 0, [], {} ) # #=> --- 0 # --- [] # --- {} # def YAML.dump_stream( objs ) d = YAML::Stream.new objs.each do \|doc\| d.add( doc ) end d.emit end # # Add a global handler for a YAML domain type. # def YAML.add_domain_type( domain, type_tag, &transfer_proc ) resolver.add_type( "tag:#{ domain }:#{ type_tag }", transfer_proc ) end # # Add a transfer method for a builtin type # def YAML.add_builtin_type( type_tag, &transfer_proc ) resolver.add_type( "tag:yaml.org,2002:#{ type_tag }", transfer_proc ) end # # Add a transfer method for a builtin type # def YAML.add_ruby_type( type_tag, &transfer_proc ) resolver.add_type( "tag:ruby.yaml.org,2002:#{ type_tag }", transfer_proc ) end # # Add a private document type # def YAML.add_private_type( type_re, &transfer_proc ) resolver.add_type( "x-private:" + type_re, transfer_proc ) end # # Detect typing of a string # def YAML.detect_implicit( val ) resolver.detect_implicit( val ) end # # Convert a type_id to a taguri # def YAML.tagurize( val ) resolver.tagurize( val ) end # # Apply a transfer method to a Ruby object # def YAML.transfer( type_id, obj ) resolver.transfer( YAML.tagurize( type_id ), obj ) end # # Apply any implicit a node may qualify for # def YAML.try_implicit( obj ) YAML.transfer( YAML.detect_implicit( obj ), obj ) end # # Method to extract colon-seperated type and class, returning # the type and the constant of the class # def YAML.read_type_class( type, obj_class ) scheme, domain, type, tclass = type.split( ':', 4 ) tclass.split( "::" ).each { \|c\| obj_class = obj_class.const_get( c ) } if tclass return [ type, obj_class ] end # # Allocate blank object # def YAML.object_maker( obj_class, val ) if Hash === val o = obj_class.allocate val.each_pair { \|k,v\| o.instance_variable_set("@#{k}", v) } o else raise YAML::Error, "Invalid object explicitly tagged !ruby/Object: " + val.inspect end end # # Allocate an Emitter if needed # def YAML.quick_emit( oid, opts = {}, &e ) out = if opts.is_a? YAML::Emitter opts else emitter.reset( opts ) end oid = case oid when Fixnum, NilClass; oid else oid = "#{oid.object_id}-#{oid.hash}" end out.emit( oid, &e ) end end require 'yaml/rubytypes' require 'yaml/types' module Kernel # # ryan:: You know how Kernel.p is a really convenient way to dump ruby # structures? The only downside is that it's not as legible as # YAML. # # _why:: (listening) # # ryan:: I know you don't want to urinate all over your users' namespaces. # But, on the other hand, convenience of dumping for debugging is, # IMO, a big YAML use case. # # _why:: Go nuts! Have a pony parade! # # ryan:: Either way, I certainly will have a pony parade. # # Prints any supplied _objects_ out in YAML. Intended as # a variation on +Kernel::p+. # # S = Struct.new(:name, :state) # s = S['dave', 'TX'] # y s # # _produces:_ # # --- !ruby/struct:S # name: dave # state: TX # def y( object, objects ) objects.unshift object puts( if objects.length == 1 YAML::dump( objects ) else YAML::dump_stream( objects ) end ) end private :y end Back

Edit File : yaml.rb | Size : 12.36 KB

# -*- mode: ruby; ruby-indent-level: 4; tab-width: 4 -*- vim: sw=4 ts=4
# $Id: yaml.rb 16084 2008-04-19 11:45:39Z knu $
#
# = yaml.rb: top-level module with methods for loading and parsing YAML documents
#
# Author:: why the lucky stiff
#

require 'stringio'
require 'yaml/error'
require 'yaml/syck'
require 'yaml/tag'
require 'yaml/stream'
require 'yaml/constants'

# == YAML
#
# YAML(tm) (rhymes with 'camel') is a
# straightforward machine parsable data serialization format designed for
# human readability and interaction with scripting languages such as Perl
# and Python. YAML is optimized for data serialization, formatted
# dumping, configuration files, log files, Internet messaging and
# filtering. This specification describes the YAML information model and
# serialization format. Together with the Unicode standard for characters, it
# provides all the information necessary to understand YAML Version 1.0
# and construct computer programs to process it.
#                         
# See http://yaml.org/ for more information.  For a quick tutorial, please
# visit YAML In Five Minutes (http://yaml.kwiki.org/?YamlInFiveMinutes).
#                              
# == About This Library
#                         
# The YAML 1.0 specification outlines four stages of YAML loading and dumping.
# This library honors all four of those stages, although data is really only
# available to you in three stages.
#     
# The four stages are: native, representation, serialization, and presentation.
#     
# The native stage refers to data which has been loaded completely into Ruby's
# own types. (See +YAML::load+.)
#
# The representation stage means data which has been composed into
# +YAML::BaseNode+ objects.  In this stage, the document is available as a
# tree of node objects.  You can perform YPath queries and transformations
# at this level.  (See +YAML::parse+.)
#   
# The serialization stage happens inside the parser.  The YAML parser used in
# Ruby is called Syck.  Serialized nodes are available in the extension as
# SyckNode structs.
#       
# The presentation stage is the YAML document itself.  This is accessible
# to you as a string.  (See +YAML::dump+.)
#   
# For more information about the various information models, see Chapter
# 3 of the YAML 1.0 Specification (http://yaml.org/spec/#id2491269).
#
# The YAML module provides quick access to the most common loading (YAML::load)
# and dumping (YAML::dump) tasks.  This module also provides an API for registering
# global types (YAML::add_domain_type).
#
# == Example
#
# A simple round-trip (load and dump) of an object.
#
#     require "yaml"
#
#     test_obj = ["dogs", "cats", "badgers"]
#
#     yaml_obj = YAML::dump( test_obj )
#                         # -> ---
#                              - dogs
#                              - cats
#                              - badgers
#     ruby_obj = YAML::load( yaml_obj )
#                         # => ["dogs", "cats", "badgers"]
#     ruby_obj == test_obj
#                         # => true
#
# To register your custom types with the global resolver, use +add_domain_type+.
#
#     YAML::add_domain_type( "your-site.com,2004", "widget" ) do |type, val|
#         Widget.new( val )
#     end
#
module YAML

Resolver = YAML::Syck::Resolver
    DefaultResolver = YAML::Syck::DefaultResolver
    DefaultResolver.use_types_at( @@tagged_classes )
    GenericResolver = YAML::Syck::GenericResolver
    Parser = YAML::Syck::Parser
    Emitter = YAML::Syck::Emitter

# Returns a new default parser
    def YAML.parser; Parser.new.set_resolver( YAML.resolver ); end
    # Returns a new generic parser
    def YAML.generic_parser; Parser.new.set_resolver( GenericResolver ); end
    # Returns the default resolver
    def YAML.resolver; DefaultResolver; end
    # Returns a new default emitter
    def YAML.emitter; Emitter.new.set_resolver( YAML.resolver ); end

#
	# Converts _obj_ to YAML and writes the YAML result to _io_.
    #     
    #   File.open( 'animals.yaml', 'w' ) do |out|
    #     YAML.dump( ['badger', 'elephant', 'tiger'], out )
    #   end
    #
    # If no _io_ is provided, a string containing the dumped YAML
    # is returned.
	#
    #   YAML.dump( :locked )
    #      #=> "--- :locked"
    #
	def YAML.dump( obj, io = nil )
        obj.to_yaml( io || io2 = StringIO.new )
        io || ( io2.rewind; io2.read )
	end

#
	# Load a document from the current _io_ stream.
	#
    #   File.open( 'animals.yaml' ) { |yf| YAML::load( yf ) }
    #      #=> ['badger', 'elephant', 'tiger']
    #
    # Can also load from a string.
    #
    #   YAML.load( "--- :locked" )
    #      #=> :locked
    #
	def YAML.load( io )
		yp = parser.load( io )
	end

#
    # Load a document from the file located at _filepath_.
    #
    #   YAML.load_file( 'animals.yaml' )
    #      #=> ['badger', 'elephant', 'tiger']
    #
    def YAML.load_file( filepath )
        File.open( filepath ) do |f|
            load( f )
        end
    end

#
	# Parse the first document from the current _io_ stream
	#
    #   File.open( 'animals.yaml' ) { |yf| YAML::load( yf ) }
    #      #=> #<YAML::Syck::Node:0x82ccce0
    #           @kind=:seq,
    #           @value=
    #            [#<YAML::Syck::Node:0x82ccd94
    #              @kind=:scalar,
    #              @type_id="str",
    #              @value="badger">,
    #             #<YAML::Syck::Node:0x82ccd58
    #              @kind=:scalar,
    #              @type_id="str",
    #              @value="elephant">,
    #             #<YAML::Syck::Node:0x82ccd1c
    #              @kind=:scalar,
    #              @type_id="str",
    #              @value="tiger">]>
    #
    # Can also load from a string.
    #
    #   YAML.parse( "--- :locked" )
    #      #=> #<YAML::Syck::Node:0x82edddc 
    #            @type_id="tag:ruby.yaml.org,2002:sym", 
    #            @value=":locked", @kind=:scalar>
    #
	def YAML.parse( io )
		yp = generic_parser.load( io )
	end

#
    # Parse a document from the file located at _filepath_.
    #
    #   YAML.parse_file( 'animals.yaml' )
    #      #=> #<YAML::Syck::Node:0x82ccce0
    #           @kind=:seq,
    #           @value=
    #            [#<YAML::Syck::Node:0x82ccd94
    #              @kind=:scalar,
    #              @type_id="str",
    #              @value="badger">,
    #             #<YAML::Syck::Node:0x82ccd58
    #              @kind=:scalar,
    #              @type_id="str",
    #              @value="elephant">,
    #             #<YAML::Syck::Node:0x82ccd1c
    #              @kind=:scalar,
    #              @type_id="str",
    #              @value="tiger">]>
    #
    def YAML.parse_file( filepath )
        File.open( filepath ) do |f|
            parse( f )
        end
    end

#
	# Calls _block_ with each consecutive document in the YAML
    # stream contained in _io_.
    #
    #   File.open( 'many-docs.yaml' ) do |yf|
    #     YAML.each_document( yf ) do |ydoc|
    #       ## ydoc contains the single object
    #       ## from the YAML document
    #     end
    #   end
	#
	def YAML.each_document( io, &block )
		yp = parser.load_documents( io, &block )
    end

#
	# Calls _block_ with each consecutive document in the YAML
    # stream contained in _io_.
    #
    #   File.open( 'many-docs.yaml' ) do |yf|
    #     YAML.load_documents( yf ) do |ydoc|
    #       ## ydoc contains the single object
    #       ## from the YAML document
    #     end
    #   end
	#
	def YAML.load_documents( io, &doc_proc )
		YAML.each_document( io, &doc_proc )
    end

#
	# Calls _block_ with a tree of +YAML::BaseNodes+, one tree for
    # each consecutive document in the YAML stream contained in _io_.
    #
    #   File.open( 'many-docs.yaml' ) do |yf|
    #     YAML.each_node( yf ) do |ydoc|
    #       ## ydoc contains a tree of nodes
    #       ## from the YAML document
    #     end
    #   end
	#
	def YAML.each_node( io, &doc_proc )
		yp = generic_parser.load_documents( io, &doc_proc )
    end

#
	# Calls _block_ with a tree of +YAML::BaseNodes+, one tree for
    # each consecutive document in the YAML stream contained in _io_.
    #
    #   File.open( 'many-docs.yaml' ) do |yf|
    #     YAML.parse_documents( yf ) do |ydoc|
    #       ## ydoc contains a tree of nodes
    #       ## from the YAML document
    #     end
    #   end
	#
	def YAML.parse_documents( io, &doc_proc )
		YAML.each_node( io, &doc_proc )
    end

#
	# Loads all documents from the current _io_ stream, 
    # returning a +YAML::Stream+ object containing all
    # loaded documents.
	#
	def YAML.load_stream( io )
		d = nil
		parser.load_documents( io ) do |doc|
			d = YAML::Stream.new if not d
			d.add( doc ) 
        end
		return d
	end

#
    # Returns a YAML stream containing each of the items in +objs+,
    # each having their own document.
    #
    #   YAML.dump_stream( 0, [], {} )
    #     #=> --- 0
    #         --- []
    #         --- {}
    #
	def YAML.dump_stream( *objs )
		d = YAML::Stream.new
        objs.each do |doc|
			d.add( doc ) 
        end
        d.emit
	end

#
	# Add a global handler for a YAML domain type.
	#
	def YAML.add_domain_type( domain, type_tag, &transfer_proc )
        resolver.add_type( "tag:#{ domain }:#{ type_tag }", transfer_proc )
	end

#
	# Add a transfer method for a builtin type
	#
	def YAML.add_builtin_type( type_tag, &transfer_proc )
	    resolver.add_type( "tag:yaml.org,2002:#{ type_tag }", transfer_proc )
	end

#
	# Add a transfer method for a builtin type
	#
	def YAML.add_ruby_type( type_tag, &transfer_proc )
	    resolver.add_type( "tag:ruby.yaml.org,2002:#{ type_tag }", transfer_proc )
	end

#
	# Add a private document type
	#
	def YAML.add_private_type( type_re, &transfer_proc )
	    resolver.add_type( "x-private:" + type_re, transfer_proc )
	end

#
    # Detect typing of a string
    #
    def YAML.detect_implicit( val )
        resolver.detect_implicit( val )
    end

#
    # Convert a type_id to a taguri
    #
    def YAML.tagurize( val )
        resolver.tagurize( val )
    end

#
    # Apply a transfer method to a Ruby object
    #
    def YAML.transfer( type_id, obj )
        resolver.transfer( YAML.tagurize( type_id ), obj )
    end

#
	# Apply any implicit a node may qualify for
	#
	def YAML.try_implicit( obj )
		YAML.transfer( YAML.detect_implicit( obj ), obj )
	end

#
    # Method to extract colon-seperated type and class, returning
    # the type and the constant of the class
    #
    def YAML.read_type_class( type, obj_class )
        scheme, domain, type, tclass = type.split( ':', 4 )
        tclass.split( "::" ).each { |c| obj_class = obj_class.const_get( c ) } if tclass
        return [ type, obj_class ]
    end

#
    # Allocate blank object
    #
    def YAML.object_maker( obj_class, val )
        if Hash === val
            o = obj_class.allocate
            val.each_pair { |k,v|
                o.instance_variable_set("@#{k}", v)
            }
            o
        else
            raise YAML::Error, "Invalid object explicitly tagged !ruby/Object: " + val.inspect
        end
    end

#
	# Allocate an Emitter if needed
	#
	def YAML.quick_emit( oid, opts = {}, &e )
        out = 
            if opts.is_a? YAML::Emitter
                opts
            else
                emitter.reset( opts )
            end
        oid =
            case oid when Fixnum, NilClass; oid
            else oid = "#{oid.object_id}-#{oid.hash}"
            end
        out.emit( oid, &e )
	end
	
end

require 'yaml/rubytypes'
require 'yaml/types'

module Kernel
    #
    # ryan:: You know how Kernel.p is a really convenient way to dump ruby
    #        structures?  The only downside is that it's not as legible as
    #        YAML.
    #
    # _why:: (listening)
    #
    # ryan:: I know you don't want to urinate all over your users' namespaces.
    #        But, on the other hand, convenience of dumping for debugging is,
    #        IMO, a big YAML use case.
    #
    # _why:: Go nuts!  Have a pony parade!
    #
    # ryan:: Either way, I certainly will have a pony parade.
    #

# Prints any supplied _objects_ out in YAML.  Intended as
    # a variation on +Kernel::p+.
    #
    #   S = Struct.new(:name, :state)
    #   s = S['dave', 'TX']
    #   y s
    #
    # _produces:_
    #
    #   --- !ruby/struct:S 
    #   name: dave
    #   state: TX
    #
    def y( object, *objects )
        objects.unshift object
        puts( if objects.length == 1
                  YAML::dump( *objects )
              else
                  YAML::dump_stream( *objects )
              end )
    end
    private :y
end

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