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require 'active_support/json/encoders'
module ActiveSupport
module JSON #:nodoc:
class CircularReferenceError < StandardError #:nodoc:
end
# A string that returns itself as as its JSON-encoded form.
class Variable < String #:nodoc:
def to_json
self
end
end
# When +true+, Hash#to_json will omit quoting string or symbol keys
# if the keys are valid JavaScript identifiers. Note that this is
# technically improper JSON (all object keys must be quoted), so if
# you need strict JSON compliance, set this option to +false+.
mattr_accessor :unquote_hash_key_identifiers
@@unquote_hash_key_identifiers = true
class << self
REFERENCE_STACK_VARIABLE = :json_reference_stack
def encode(value)
raise_on_circular_reference(value) do
Encoders[value.class].call(value)
end
end
def can_unquote_identifier?(key)
return false unless unquote_hash_key_identifiers
key.to_s =~ /^[[:alpha:]_$][[:alnum:]_$]*$/
end
protected
def raise_on_circular_reference(value)
stack = Thread.current[REFERENCE_STACK_VARIABLE] ||= []
raise CircularReferenceError, 'object references itself' if
stack.include? value
stack << value
yield
ensure
stack.pop
end
end
end
end
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