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|
module Psych
module Visitors
class YAMLTree < Psych::Visitors::Visitor
attr_reader :tree
def initialize options = {}
super()
@json = options[:json]
@tree = Nodes::Stream.new
@stack = []
@st = {}
@ss = ScalarScanner.new
@dispatch_cache = Hash.new do |h,klass|
method = "visit_#{(klass.name || '').split('::').join('_')}"
method = respond_to?(method) ? method : h[klass.superclass]
raise(TypeError, "Can't dump #{target.class}") unless method
h[klass] = method
end
end
def << object
doc = create_document
@stack << doc
@tree.children << doc
accept object
end
def accept target
# return any aliases we find
if node = @st[target.object_id]
node.anchor = target.object_id.to_s
return append Nodes::Alias.new target.object_id.to_s
end
if target.respond_to?(:encode_with)
dump_coder target
else
send(@dispatch_cache[target.class], target)
end
end
def visit_Psych_Omap o
seq = Nodes::Sequence.new(nil, '!omap', false)
register(o, seq)
@stack.push append seq
o.each { |k,v| visit_Hash k => v }
@stack.pop
end
def visit_Object o
tag = Psych.dump_tags[o.class]
unless tag
klass = o.class == Object ? nil : o.class.name
tag = ['!ruby/object', klass].compact.join(':')
end
map = append Nodes::Mapping.new(nil, tag, false)
register(o, map)
@stack.push map
dump_ivars(o, map)
@stack.pop
end
def visit_Struct o
tag = ['!ruby/struct', o.class.name].compact.join(':')
map = register(o, Nodes::Mapping.new(nil, tag, false))
@stack.push append map
o.members.each do |member|
map.children << Nodes::Scalar.new("#{member}")
accept o[member]
end
dump_ivars(o, map)
@stack.pop
end
def visit_Exception o
tag = ['!ruby/exception', o.class.name].join ':'
map = append Nodes::Mapping.new(nil, tag, false)
@stack.push map
{
'message' => private_iv_get(o, 'mesg'),
'backtrace' => private_iv_get(o, 'backtrace'),
}.each do |k,v|
next unless v
map.children << Nodes::Scalar.new(k)
accept v
end
dump_ivars(o, map)
@stack.pop
end
def visit_Regexp o
append Nodes::Scalar.new(o.inspect, nil, '!ruby/regexp', false)
end
def visit_Time o
formatted = o.strftime("%Y-%m-%d %H:%M:%S")
if o.utc?
formatted += ".%06dZ" % [o.usec]
else
formatted += ".%06d %+.2d:00" % [o.usec, o.gmt_offset / 3600]
end
append Nodes::Scalar.new formatted
end
def visit_Rational o
map = append Nodes::Mapping.new(nil, '!ruby/object:Rational', false)
[
'denominator', o.denominator.to_s,
'numerator', o.numerator.to_s
].each do |m|
map.children << Nodes::Scalar.new(m)
end
end
def visit_Complex o
map = append Nodes::Mapping.new(nil, '!ruby/object:Complex', false)
['real', o.real.to_s, 'image', o.imag.to_s].each do |m|
map.children << Nodes::Scalar.new(m)
end
end
def visit_Integer o
append Nodes::Scalar.new o.to_s
end
alias :visit_TrueClass :visit_Integer
alias :visit_FalseClass :visit_Integer
alias :visit_Date :visit_Integer
def visit_Float o
if o.nan?
append Nodes::Scalar.new '.nan'
elsif o.infinite?
append Nodes::Scalar.new(o.infinite? > 0 ? '.inf' : '-.inf')
else
append Nodes::Scalar.new o.to_s
end
end
def visit_String o
plain = false
quote = false
if o.index("\x00") || o.count("^ -~\t\r\n").fdiv(o.length) > 0.3
str = [o].pack('m').chomp
tag = '!binary'
else
str = o
tag = nil
quote = !(String === @ss.tokenize(o))
plain = !quote
end
ivars = o.respond_to?(:to_yaml_properties) ?
o.to_yaml_properties :
o.instance_variables
scalar = create_scalar str, nil, tag, plain, quote
if ivars.empty?
append scalar
else
mapping = append Nodes::Mapping.new(nil, '!str', false)
mapping.children << Nodes::Scalar.new('str')
mapping.children << scalar
@stack.push mapping
dump_ivars o, mapping
@stack.pop
end
end
def visit_Class o
raise TypeError, "can't dump anonymous class #{o.class}"
end
def visit_Range o
@stack.push append Nodes::Mapping.new(nil, '!ruby/range', false)
['begin', o.begin, 'end', o.end, 'excl', o.exclude_end?].each do |m|
accept m
end
@stack.pop
end
def visit_Hash o
@stack.push append register(o, create_mapping)
o.each do |k,v|
accept k
accept v
end
@stack.pop
end
def visit_Psych_Set o
@stack.push append register(o, Nodes::Mapping.new(nil, '!set', false))
o.each do |k,v|
accept k
accept v
end
@stack.pop
end
def visit_Array o
@stack.push append register(o, create_sequence)
o.each { |c| accept c }
@stack.pop
end
def visit_NilClass o
append Nodes::Scalar.new('', nil, 'tag:yaml.org,2002:null', false)
end
def visit_Symbol o
append create_scalar ":#{o}"
end
private
def append o
@stack.last.children << o
o
end
def register target, yaml_obj
@st[target.object_id] = yaml_obj
yaml_obj
end
def dump_coder o
tag = Psych.dump_tags[o.class]
unless tag
klass = o.class == Object ? nil : o.class.name
tag = ['!ruby/object', klass].compact.join(':')
end
c = Psych::Coder.new(tag)
o.encode_with(c)
emit_coder c
end
def emit_coder c
case c.type
when :scalar
append create_scalar(c.scalar, nil, c.tag, c.tag.nil?)
when :seq
@stack.push append create_sequence(nil, c.tag, c.tag.nil?)
c.seq.each do |thing|
accept thing
end
@stack.pop
when :map
map = append Nodes::Mapping.new(nil, c.tag, c.implicit, c.style)
@stack.push map
c.map.each do |k,v|
map.children << create_scalar(k)
accept v
end
@stack.pop
end
end
def dump_ivars target, map
ivars = target.respond_to?(:to_yaml_properties) ?
target.to_yaml_properties :
target.instance_variables
ivars.each do |iv|
map.children << create_scalar("#{iv.to_s.sub(/^@/, '')}")
accept target.instance_variable_get(iv)
end
end
def create_document
Nodes::Document.new
end
def create_mapping
Nodes::Mapping.new
end
def create_scalar value, anchor = nil, tag = nil, plain = true, quoted = false, style = Nodes::Scalar::ANY
Nodes::Scalar.new(value, anchor, tag, plain, quoted, style)
end
def create_sequence anchor = nil, tag = nil, implicit = true, style = Nodes::Sequence::BLOCK
Nodes::Sequence.new(anchor, tag, implicit, style)
end
end
end
end
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