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|
module Psych
module Visitors
class YASTBuilder < Psych::Visitors::Visitor
attr_reader :tree
def initialize options = {}
super()
@tree = Nodes::Stream.new
@tree.children << Nodes::Document.new
@stack = @tree.children.dup
@st = {}
end
def accept target
target.class.ancestors.each do |klass|
next unless klass.name
method_name = :"visit_#{klass.name.split('::').join('_')}"
if respond_to?(method_name)
return send(method_name, target)
end
end
raise TypeError, "Can't dump #{target.class}"
end
def visit_Object o
tag = ['!ruby/object', o.class.name].join(':')
@stack.push append Nodes::Mapping.new(nil, tag, false)
o.instance_variables.each do |iv|
accept iv.to_s.sub(/^@/, '')
accept o.instance_variable_get(iv)
end
@stack.pop
end
def visit_Struct o
tag = ['!ruby/struct', o.class.name].compact.join(':')
@stack.push append Nodes::Mapping.new(nil, tag, false)
o.members.each do |member|
accept member
accept o[member]
end
@stack.pop
end
def visit_Exception o
@stack.push append Nodes::Mapping.new(nil, '!ruby/exception', false)
['message', o.message].each do |m|
accept m
end
@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 %d:00" % [o.usec, o.gmt_offset / 3600]
end
append Nodes::Scalar.new formatted
end
def visit_Date o
append Nodes::Scalar.new o.to_s
end
def visit_Rational o
@stack.push append Nodes::Mapping.new(nil,'!ruby/object:Rational',false)
['denominator', o.denominator, 'numerator', o.numerator].each do |m|
accept m
end
@stack.pop
end
def visit_Complex o
@stack.push append Nodes::Mapping.new(nil, '!ruby/object:Complex', false)
['real', o.real, 'image', o.image].each do |m|
accept m
end
@stack.pop
end
def visit_Integer o
append Nodes::Scalar.new o.to_s
end
def visit_TrueClass o
append Nodes::Scalar.new o.to_s
end
def visit_FalseClass o
append Nodes::Scalar.new o.to_s
end
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
quote = ScalarScanner.new(o).tokenize.first != :SCALAR
scalar = Nodes::Scalar.new(o, nil, nil, !quote, quote)
@stack.last.children << scalar
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
if node = @st[o.object_id]
node.anchor = o.object_id.to_s
return append Nodes::Alias.new o.object_id.to_s
end
map = Nodes::Mapping.new
@st[o.object_id] = map
@stack.push append map
o.each do |k,v|
accept k
accept v
end
@stack.pop
end
def visit_Array o
if node = @st[o.object_id]
node.anchor = o.object_id.to_s
return append Nodes::Alias.new o.object_id.to_s
end
seq = Nodes::Sequence.new
@st[o.object_id] = seq
@stack.push append seq
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 Nodes::Scalar.new ":#{o}"
end
private
def append o
@stack.last.children << o
o
end
end
end
end
|
