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require 'psych/scalar_scanner'
module Psych
module Visitors
###
# This class walks a YAML AST, converting each node to ruby
class ToRuby < Psych::Visitors::Visitor
def initialize
super
@st = {}
@ss = ScalarScanner.new
@domain_types = Psych.domain_types
end
def accept target
result = super
return result if @domain_types.empty? || !target.tag
short_name = target.tag.sub(/^!/, '').split('/', 2).last
if Psych.domain_types.key? short_name
url, block = Psych.domain_types[short_name]
return block.call "#{url}:#{short_name}", result
end
result
end
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:Complex"
Complex(o.value)
when "!ruby/object:Rational"
Rational(o.value)
when "tag:yaml.org,2002:float", "!float"
Float(@ss.tokenize(o.value))
when "!ruby/regexp"
o.value =~ /^\/(.*)\/([mix]*)$/
source = $1
options = 0
lang = nil
($2 || '').split('').each do |option|
case option
when 'x' then options |= Regexp::EXTENDED
when 'i' then options |= Regexp::IGNORECASE
when 'm' then options |= Regexp::MULTILINE
else lang = option
end
end
Regexp.new(*[source, options, lang].compact)
when "!ruby/range"
args = o.value.split(/([.]{2,3})/, 2).map { |s|
accept Nodes::Scalar.new(s)
}
args.push(args.delete_at(1) == '...')
Range.new(*args)
when /^!ruby\/sym(bol)?:?(.*)?$/
o.value.to_sym
else
@ss.tokenize o.value
end
end
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
def visit_Psych_Nodes_Mapping o
return revive(Psych.load_tags[o.tag], o) if Psych.load_tags[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)
@st[o.anchor] = obj if o.anchor
obj
else
hash = {}
@st[o.anchor] = hash if o.anchor
o.children.each_slice(2) { |k,v|
key = accept(k)
if key == '<<' && Nodes::Alias === v
# FIXME: remove this when "<<" syntax is deprecated
if $VERBOSE
where = caller.find { |x| x !~ /psych/ }
warn where
warn "\"<<: *#{v.anchor}\" is no longer supported, please switch to \"*#{v.anchor}\""
end
return accept(v)
else
hash[key] = accept(v)
end
}
hash
end
end
def visit_Psych_Nodes_Document o
accept o.root
end
def visit_Psych_Nodes_Stream o
o.children.map { |c| accept c }
end
def visit_Psych_Nodes_Alias o
@st[o.anchor]
end
private
def revive klass, node
s = klass.allocate
h = Hash[*node.children.map { |c| accept c }]
init_with(s, h, node)
end
def init_with o, h, node
if o.respond_to?(:init_with)
c = Psych::Coder.new(node.tag)
c.map = h
o.init_with c
else
h.each { |k,v| o.instance_variable_set(:"@#{k}", v) }
end
o
end
# Convert +klassname+ to a Class
def resolve_class klassname
return nil unless klassname and not klassname.empty?
name = klassname
retried = false
begin
path2class(name)
rescue ArgumentError => ex
name = "Struct::#{name}"
unless retried
retried = true
retry
end
raise ex
end
end
end
end
end
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