Class: Psych::Visitors::ToRuby

Inherits:
Visitor show all
Defined in:
lib/psych/visitors/to_ruby.rb,
ext/psych/to_ruby.c

Overview

This class walks a YAML AST, converting each node to ruby

Instance Method Summary collapse

Constructor Details

#initialize(ss = ScalarScanner.new) ⇒ ToRuby

Returns a new instance of ToRuby.



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# File 'lib/psych/visitors/to_ruby.rb', line 12

def initialize ss = ScalarScanner.new
  super()
  @st = {}
  @ss = ss
  @domain_types = Psych.domain_types
end

Instance Method Details

#accept(target) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 19

def accept target
  result = super
  return result if @domain_types.empty? || !target.tag

  key = target.tag.sub(/^[!\/]*/, '').sub(/(,\d+)\//, '\1:')
  key = "tag:#{key}" unless key =~ /^(tag:|x-private)/

  if @domain_types.key? key
    value, block = @domain_types[key]
    return block.call value, result
  end

  result
end

#visit_Psych_Nodes_Alias(o) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 207

def visit_Psych_Nodes_Alias o
  @st.fetch(o.anchor) { raise BadAlias, "Unknown alias: #{o.anchor}" }
end

#visit_Psych_Nodes_Document(o) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 199

def visit_Psych_Nodes_Document o
  accept o.root
end

#visit_Psych_Nodes_Mapping(o) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 125

def visit_Psych_Nodes_Mapping o
  return revive(Psych.load_tags[o.tag], o) if Psych.load_tags[o.tag]
  return revive_hash({}, o) unless o.tag

  case o.tag
  when '!str', 'tag:yaml.org,2002:str'
    members = Hash[*o.children.map { |c| accept c }]
    string = members.delete 'str'
    init_with(string, members.map { |k,v| [k.to_s.sub(/^@/, ''),v] }, o)
  when /^!ruby\/struct:?(.*)?$/
    klass = resolve_class($1)

    if klass
      s = klass.allocate
      @st[o.anchor] = s if o.anchor

      members = {}
      struct_members = s.members.map { |x| x.to_sym }
      o.children.each_slice(2) do |k,v|
        member = accept(k)
        value  = accept(v)
        if struct_members.include?(member.to_sym)
          s.send("#{member}=", value)
        else
          members[member.to_s.sub(/^@/, '')] = value
        end
      end
      init_with(s, members, o)
    else
      members = o.children.map { |c| accept c }
      h = Hash[*members]
      Struct.new(*h.map { |k,v| k.to_sym }).new(*h.map { |k,v| v })
    end

  when '!ruby/range'
    h = Hash[*o.children.map { |c| accept c }]
    Range.new(h['begin'], h['end'], h['excl'])

  when /^!ruby\/exception:?(.*)?$/
    h = Hash[*o.children.map { |c| accept c }]

    e = build_exception((resolve_class($1) || Exception),
                        h.delete('message'))
    init_with(e, h, o)

  when '!set', 'tag:yaml.org,2002:set'
    set = Psych::Set.new
    @st[o.anchor] = set if o.anchor
    o.children.each_slice(2) do |k,v|
      set[accept(k)] = accept(v)
    end
    set

  when '!ruby/object:Complex'
    h = Hash[*o.children.map { |c| accept c }]
    Complex(h['real'], h['image'])

  when '!ruby/object:Rational'
    h = Hash[*o.children.map { |c| accept c }]
    Rational(h['numerator'], h['denominator'])

  when /^!ruby\/object:?(.*)?$/
    name = $1 || 'Object'
    obj = revive((resolve_class(name) || Object), o)
    obj

  when /^!map:(.*)$/, /^!ruby\/hash:(.*)$/
    revive_hash resolve_class($1).new, o

  else
    revive_hash({}, o)
  end
end

#visit_Psych_Nodes_Scalar(o) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 34

def visit_Psych_Nodes_Scalar o
  @st[o.anchor] = o.value if o.anchor

  if klass = Psych.load_tags[o.tag]
    instance = klass.allocate

    if instance.respond_to?(:init_with)
      coder = Psych::Coder.new(o.tag)
      coder.scalar = o.value
      instance.init_with coder
    end

    return instance
  end

  return o.value if o.quoted
  return @ss.tokenize(o.value) unless o.tag

  case o.tag
  when '!binary', 'tag:yaml.org,2002:binary'
    o.value.unpack('m').first
  when '!str', 'tag:yaml.org,2002:str'
    o.value
  when "!ruby/object:DateTime"
    require 'date'
    @ss.parse_time(o.value).to_datetime
  when "!ruby/object:Complex"
    Complex(o.value)
  when "!ruby/object:Rational"
    Rational(o.value)
  when "!ruby/class", "!ruby/module"
    resolve_class o.value
  when "tag:yaml.org,2002:float", "!float"
    Float(@ss.tokenize(o.value))
  when "!ruby/regexp"
    o.value =~ /^\/(.*)\/([mixn]*)$/
    source  = $1
    options = 0
    lang    = nil
    ($2 || '').split('').each do |option|
      case option
      when 'x' then options |= Regexp::EXTENDED
      when 'i' then options |= Regexp::IGNORECASE
      when 'm' then options |= Regexp::MULTILINE
      when 'n' then options |= Regexp::NOENCODING
      else lang = option
      end
    end
    Regexp.new(*[source, options, lang].compact)
  when "!ruby/range"
    args = o.value.split(/([.]{2,3})/, 2).map { |s|
      accept Nodes::Scalar.new(s)
    }
    args.push(args.delete_at(1) == '...')
    Range.new(*args)
  when /^!ruby\/sym(bol)?:?(.*)?$/
    o.value.to_sym
  else
    @ss.tokenize o.value
  end
end

#visit_Psych_Nodes_Sequence(o) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 96

def visit_Psych_Nodes_Sequence o
  if klass = Psych.load_tags[o.tag]
    instance = klass.allocate

    if instance.respond_to?(:init_with)
      coder = Psych::Coder.new(o.tag)
      coder.seq = o.children.map { |c| accept c }
      instance.init_with coder
    end

    return instance
  end

  case o.tag
  when '!omap', 'tag:yaml.org,2002:omap'
    map = Psych::Omap.new
    @st[o.anchor] = map if o.anchor
    o.children.each { |a|
      map[accept(a.children.first)] = accept a.children.last
    }
    map
  else
    list = []
    @st[o.anchor] = list if o.anchor
    o.children.each { |c| list.push accept c }
    list
  end
end

#visit_Psych_Nodes_Stream(o) ⇒ Object 



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# File 'lib/psych/visitors/to_ruby.rb', line 203

def visit_Psych_Nodes_Stream o
  o.children.map { |c| accept c }
end