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