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|
#--
##############################################################
# Copyright 2006, Ben Bleything <ben@bleything.net> and #
# Patrick May <patrick@hexane.org> #
# #
# Distributed under the MIT license. #
##############################################################
#++
#
# Plist parses Mac OS X xml property list files into ruby data structures.
#
# === Load a plist file
# This is the main point of the library:
#
# r = Plist::parse_xml( filename_or_xml )
module Plist
TEMPLATE = <<-XML
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
%plist%
</plist>
XML
def Plist::_xml( xml )
TEMPLATE.sub( /%plist%/, xml )
end
# Note that I don't use these two elements much:
#
# + Date elements are returned as DateTime objects.
# + Data elements are implemented as Tempfiles
#
# Plist::parse_xml will blow up if it encounters a data element.
# If you encounter such an error, or if you have a Date element which
# can't be parsed into a Time object, please send your plist file to
# plist@hexane.org so that I can implement the proper support.
def Plist::parse_xml( filename_or_xml )
listener = Listener.new
#parser = REXML::Parsers::StreamParser.new(File.new(filename), listener)
parser = StreamParser.new(filename_or_xml, listener)
parser.parse
listener.result
end
class Listener
#include REXML::StreamListener
attr_accessor :result, :open
def initialize
@result = nil
@open = Array.new
end
def tag_start(name, attributes)
@open.push PTag::mappings[name].new
end
def text( contents )
@open.last.text = contents if @open.last
end
def tag_end(name)
last = @open.pop
if @open.empty?
@result = last.to_ruby
else
@open.last.children.push last
end
end
end
class StreamParser
def initialize( filename_or_xml, listener )
@filename_or_xml = filename_or_xml
@listener = listener
end
TEXT = /([^<]+)/
XMLDECL_PATTERN = /<\?xml\s+(.*?)\?>*/um
DOCTYPE_PATTERN = /\s*<!DOCTYPE\s+(.*?)(\[|>)/um
def parse
plist_tags = PTag::mappings.keys.join('|')
start_tag = /<(#{plist_tags})([^>]*)>/i
end_tag = /<\/(#{plist_tags})[^>]*>/i
require 'strscan'
@scanner = StringScanner.new( if (File.exists? @filename_or_xml)
File.open(@filename_or_xml, "r") {|f| f.read}
else
@filename_or_xml
end )
until @scanner.eos?
if @scanner.scan(XMLDECL_PATTERN)
elsif @scanner.scan(DOCTYPE_PATTERN)
elsif @scanner.scan(start_tag)
@listener.tag_start(@scanner[1], nil)
if (@scanner[2] =~ /\/$/)
@listener.tag_end(@scanner[1])
end
elsif @scanner.scan(TEXT)
@listener.text(@scanner[1])
elsif @scanner.scan(end_tag)
@listener.tag_end(@scanner[1])
else
raise "Unimplemented element"
end
end
end
end
class PTag
@@mappings = { }
def PTag::mappings
@@mappings
end
def PTag::inherited( sub_class )
key = sub_class.to_s.downcase
key.gsub!(/^plist::/, '' )
key.gsub!(/^p/, '') unless key == "plist"
@@mappings[key] = sub_class
end
attr_accessor :text, :children
def initialize
@children = Array.new
end
def to_ruby
raise "Unimplemented: " + self.class.to_s + "#to_ruby on #{self.inspect}"
end
end
class PList < PTag
def to_ruby
children.first.to_ruby
end
end
class PDict < PTag
def to_ruby
dict = Hash.new
key = nil
children.each do |c|
if key.nil?
key = c.to_ruby
else
dict[key] = c.to_ruby
key = nil
end
end
dict
end
end
class PKey < PTag
def to_ruby
text
end
end
class PString < PTag
def to_ruby
text || ''
end
end
class PArray < PTag
def to_ruby
children.collect do |c|
c.to_ruby
end
end
end
class PInteger < PTag
def to_ruby
text.to_i
end
end
class PTrue < PTag
def to_ruby
true
end
end
class PFalse < PTag
def to_ruby
false
end
end
class PReal < PTag
def to_ruby
text.to_f
end
end
require 'date'
class PDate < PTag
def to_ruby
DateTime.parse(text)
end
end
require 'base64'
require 'tempfile'
class PData < PTag
def to_ruby
tf = Tempfile.new("plist.tmp")
tf.write Base64.decode64(text.gsub(/\s+/,''))
tf.close
# is this a good idea?
tf.open
tf
end
end
end
|
