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# encoding: utf-8
# = plist
#
# Copyright 2006-2010 Ben Bleything and Patrick May
# Distributed under the MIT License
#
module Plist
# === Create a plist
# You can dump an object to a plist in one of two ways:
#
# * <tt>Plist::Emit.dump(obj)</tt>
# * <tt>obj.to_plist</tt>
# * This requires that you mixin the <tt>Plist::Emit</tt> module, which is already done for +Array+ and +Hash+.
#
# The following Ruby classes are converted into native plist types:
# Array, Bignum, Date, DateTime, Fixnum, Float, Hash, Integer, String, Symbol, Time, true, false
# * +Array+ and +Hash+ are both recursive; their elements will be converted into plist nodes inside the <array> and <dict> containers (respectively).
# * +IO+ (and its descendants) and +StringIO+ objects are read from and their contents placed in a <data> element.
# * User classes may implement +to_plist_node+ to dictate how they should be serialized; otherwise the object will be passed to <tt>Marshal.dump</tt> and the result placed in a <data> element.
#
# For detailed usage instructions, refer to USAGE[link:files/docs/USAGE.html] and the methods documented below.
module Emit
DEFAULT_INDENT = "\t"
# Helper method for injecting into classes. Calls <tt>Plist::Emit.dump</tt> with +self+.
def to_plist(envelope = true, options = {})
Plist::Emit.dump(self, envelope, options)
end
# Helper method for injecting into classes. Calls <tt>Plist::Emit.save_plist</tt> with +self+.
def save_plist(filename, options = {})
Plist::Emit.save_plist(self, filename, options)
end
# The following Ruby classes are converted into native plist types:
# Array, Bignum, Date, DateTime, Fixnum, Float, Hash, Integer, String, Symbol, Time
#
# Write us (via RubyForge) if you think another class can be coerced safely into one of the expected plist classes.
#
# +IO+ and +StringIO+ objects are encoded and placed in <data> elements; other objects are <tt>Marshal.dump</tt>'ed unless they implement +to_plist_node+.
#
# The +envelope+ parameters dictates whether or not the resultant plist fragment is wrapped in the normal XML/plist header and footer. Set it to false if you only want the fragment.
def self.dump(obj, envelope = true, options = {})
options = { :indent => DEFAULT_INDENT }.merge(options)
output = PlistBuilder.new(options[:indent]).build(obj)
output = wrap(output) if envelope
output
end
# Writes the serialized object's plist to the specified filename.
def self.save_plist(obj, filename, options = {})
File.open(filename, 'wb') do |f|
f.write(obj.to_plist(true, options))
end
end
private
class PlistBuilder
def initialize(indent_str)
@indent_str = indent_str.to_s
end
def build(element, level=0)
if element.respond_to? :to_plist_node
element.to_plist_node
else
case element
when Array
if element.empty?
tag('array', nil, level)
else
tag('array', nil, level) {
element.collect {|e| build(e, level + 1) }.join
}
end
when Hash
if element.empty?
tag('dict', nil, level)
else
tag('dict', '', level) do
element.sort_by{|k,v| k.to_s }.collect do |k,v|
tag('key', CGI.escapeHTML(k.to_s), level + 1) +
build(v, level + 1)
end.join
end
end
when true, false
tag(element, nil, level)
when Time
tag('date', element.utc.strftime('%Y-%m-%dT%H:%M:%SZ'), level)
when Date # also catches DateTime
tag('date', element.strftime('%Y-%m-%dT%H:%M:%SZ'), level)
when String, Symbol, Integer, Float
tag(element_type(element), CGI.escapeHTML(element.to_s), level)
when IO, StringIO
data = element.tap(&:rewind).read
data_tag(data, level)
else
data = Marshal.dump(element)
comment_tag('The <data> element below contains a Ruby object which has been serialized with Marshal.dump.') +
data_tag(data, level)
end
end
end
private
def tag(type, contents, level, &block)
if block_given?
indent("<#{type}>\n", level) +
block.call +
indent("</#{type}>\n", level)
elsif contents.to_s.empty?
indent("<#{type}/>\n", level)
else
indent("<#{type}>#{contents.to_s}</#{type}>\n", level)
end
end
def data_tag(data, level)
# note that apple plists are wrapped at a different length then
# what ruby's base64 wraps by default.
# I used #encode64 instead of #b64encode (which allows a length arg)
# because b64encode is b0rked and ignores the length arg.
tag('data', nil, level) do
Base64.encode64(data)
.gsub(/\s+/, '')
.scan(/.{1,68}/o)
.collect { |line| indent(line, level) }
.join("\n")
.concat("\n")
end
end
def indent(str, level)
@indent_str.to_s * level + str
end
def element_type(item)
case item
when String, Symbol
'string'
when Integer
'integer'
when Float
'real'
else
raise "Don't know about this data type... something must be wrong!"
end
end
def comment_tag(content)
return "<!-- #{content} -->\n"
end
end
def self.wrap(contents)
output = '<?xml version="1.0" encoding="UTF-8"?>' + "\n"
output << '<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">' + "\n"
output << '<plist version="1.0">' + "\n"
output << contents
output << '</plist>' + "\n"
output
end
end
end
class Array #:nodoc:
include Plist::Emit
end
class Hash #:nodoc:
include Plist::Emit
end
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