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Filename : property.rb
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# soap/property.rb: SOAP4R - Property implementation.
# Copyright (C) 2003  NAKAMURA, Hiroshi <nahi@ruby-lang.org>.

# This program is copyrighted free software by NAKAMURA, Hiroshi.  You can
# redistribute it and/or modify it under the same terms of Ruby's license;
# either the dual license version in 2003, or any later version.


module SOAP


# Property stream format:
#
#   line separator is \r?\n.  1 line per a property.
#   line which begins with '#' is a comment line.  empty line is ignored, too.
#   key/value separator is ':' or '='.
#   '\' as escape character.  but line separator cannot be escaped.
#   \s at the head/tail of key/value are trimmed.
#
#   '[' + key + ']' indicates property section.  for example,
#
#     [aaa.bbb]
#     ccc = ddd
#     eee.fff = ggg
#     []
#     aaa.hhh = iii
#
#   is the same as;
#
#     aaa.bbb.ccc = ddd
#     aaa.bbb.eee.fff = ggg
#     aaa.hhh = iii
#
class Property
  FrozenError = (RUBY_VERSION >= "1.9.0") ? RuntimeError : TypeError

  include Enumerable

  module Util
    def const_from_name(fqname)
      fqname.split("::").inject(Kernel) { |klass, name| klass.const_get(name) }
    end
    module_function :const_from_name

    def require_from_name(fqname)
      require File.join(fqname.split("::").collect { |ele| ele.downcase })
    end
    module_function :require_from_name
  end

  def self.load(stream)
    new.load(stream)
  end

  def self.loadproperty(propname)
    new.loadproperty(propname)
  end

  def initialize
    @store = Hash.new
    @hook = Hash.new
    @self_hook = Array.new
    @locked = false
  end

  KEY_REGSRC = '([^=:\\\\]*(?:\\\\.[^=:\\\\]*)*)'
  DEF_REGSRC = '\\s*' + KEY_REGSRC + '\\s*[=:]\\s*(.*)'
  COMMENT_REGEXP = Regexp.new('^(?:#.*|)$')
  CATDEF_REGEXP = Regexp.new("^\\[\\s*#{KEY_REGSRC}\\s*\\]$")
  LINE_REGEXP = Regexp.new("^#{DEF_REGSRC}$")
  def load(stream)
    key_prefix = ""
    stream.each_with_index do |line, lineno|
      line.sub!(/\r?\n\z/, '')
      case line
      when COMMENT_REGEXP
	next
      when CATDEF_REGEXP
	key_prefix = $1.strip
      when LINE_REGEXP
	key, value = $1.strip, $2.strip
	key = "#{key_prefix}.#{key}" unless key_prefix.empty?
	key, value = loadstr(key), loadstr(value)
	self[key] = value
      else
	raise TypeError.new(
	  "property format error at line #{lineno + 1}: `#{line}'")
      end
    end
    self
  end

  # find property from $:.
  def loadproperty(propname)
    return loadpropertyfile(propname) if File.file?(propname)
    $:.each do |path|
      if File.file?(file = File.join(path, propname))
        return loadpropertyfile(file)
      end
    end
    nil
  end

  # name: a Symbol, String or an Array
  def [](name)
    referent(name_to_a(name))
  end

  # name: a Symbol, String or an Array
  # value: an Object
  def []=(name, value)
    name_pair = name_to_a(name).freeze
    hooks = assign(name_pair, value)
    hooks.each do |hook|
      hook.call(name_pair, value)
    end
    value
  end

  # value: an Object
  # key is generated by property
  def <<(value)
    self[generate_new_key] = value
  end

  # name: a Symbol, String or an Array; nil means hook to the root
  # cascade: true/false; for cascading hook of sub key
  # hook: block which will be called with 2 args, name and value
  def add_hook(name = nil, cascade = false, &hook)
    if name == nil or name == true or name == false
      cascade = name
      assign_self_hook(cascade, &hook)
    else
      assign_hook(name_to_a(name), cascade, &hook)
    end
  end

  def each
    @store.each do |key, value|
      yield(key, value)
    end
  end

  def empty?
    @store.empty?
  end

  def keys
    @store.keys
  end

  def values
    @store.values
  end

  def lock(cascade = false)
    if cascade
      each_key do |key|
	key.lock(cascade)
      end
    end
    @locked = true
    self
  end

  def unlock(cascade = false)
    @locked = false
    if cascade
      each_key do |key|
	key.unlock(cascade)
      end
    end
    self
  end

  def locked?
    @locked
  end

protected

  def deref_key(key)
    check_lock(key)
    ref = @store[key] ||= self.class.new
    unless propkey?(ref)
      raise ArgumentError.new("key `#{key}' already defined as a value")
    end
    ref
  end

  def local_referent(key)
    check_lock(key)
    if propkey?(@store[key]) and @store[key].locked?
      raise FrozenError.new("cannot split any key from locked property")
    end
    @store[key]
  end

  def local_assign(key, value)
    check_lock(key)
    if @locked
      if propkey?(value)
	raise FrozenError.new("cannot add any key to locked property")
      elsif propkey?(@store[key])
	raise FrozenError.new("cannot override any key in locked property")
      end
    end
    @store[key] = value
  end

  def local_hook(key, direct)
    hooks = []
    (@self_hook + (@hook[key] || NO_HOOK)).each do |hook, cascade|
      hooks << hook if direct or cascade
    end
    hooks
  end

  def local_assign_hook(key, cascade, &hook)
    check_lock(key)
    @store[key] ||= nil
    (@hook[key] ||= []) << [hook, cascade]
  end

private

  NO_HOOK = [].freeze

  def referent(ary)
    ary[0..-2].inject(self) { |ref, name|
      ref.deref_key(to_key(name))
    }.local_referent(to_key(ary.last))
  end

  def assign(ary, value)
    ref = self
    hook = NO_HOOK
    ary[0..-2].each do |name|
      key = to_key(name)
      hook += ref.local_hook(key, false)
      ref = ref.deref_key(key)
    end
    last_key = to_key(ary.last)
    ref.local_assign(last_key, value)
    hook + ref.local_hook(last_key, true)
  end

  def assign_hook(ary, cascade, &hook)
    ary[0..-2].inject(self) { |ref, name|
      ref.deref_key(to_key(name))
    }.local_assign_hook(to_key(ary.last), cascade, &hook)
  end

  def assign_self_hook(cascade, &hook)
    check_lock(nil)
    @self_hook << [hook, cascade]
  end

  def each_key
    self.each do |key, value|
      if propkey?(value)
	yield(value)
      end
    end
  end

  def check_lock(key)
    if @locked and (key.nil? or !@store.key?(key))
      raise FrozenError.new("cannot add any key to locked property")
    end
  end

  def propkey?(value)
    value.is_a?(::SOAP::Property)
  end

  def name_to_a(name)
    case name
    when Symbol
      [name]
    when String
      name.scan(/[^.\\]+(?:\\.[^.\\])*/)	# split with unescaped '.'
    when Array
      name
    else
      raise ArgumentError.new("Unknown name #{name}(#{name.class})")
    end
  end

  def to_key(name)
    name.to_s.downcase
  end

  def generate_new_key
    if @store.empty?
      "0"
    else
      (key_max + 1).to_s
    end
  end

  def key_max
    (@store.keys.max { |l, r| l.to_s.to_i <=> r.to_s.to_i }).to_s.to_i
  end

  def loadpropertyfile(file)
    puts "find property at #{file}" if $DEBUG
    File.open(file) do |f|
      load(f)
    end
  end

  def loadstr(str)
    str.gsub(/\\./) { |c| eval("\"#{c}\"") }
  end
end


end


# for ruby/1.6.
unless Enumerable.instance_methods.include?('inject')
  module Enumerable
    def inject(init)
      result = init
      each do |item|
	result = yield(result, item)
      end
      result
    end
  end
end