41 lines
1.1 KiB
Ruby
41 lines
1.1 KiB
Ruby
require 'yaml'
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require 'strscan'
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module ActiveSupport
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module JSON
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class ParseError < StandardError
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end
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class << self
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# Converts a JSON string into a Ruby object.
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def decode(json)
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YAML.load(convert_json_to_yaml(json))
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rescue ArgumentError => e
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raise ParseError, "Invalid JSON string"
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end
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protected
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# Ensure that ":" and "," are always followed by a space
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def convert_json_to_yaml(json) #:nodoc:
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scanner, quoting, marks = StringScanner.new(json), false, []
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while scanner.scan_until(/(['":,]|\\.)/)
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case char = scanner[1]
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when '"', "'"
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quoting = quoting == char ? false : char
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when ":", ","
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marks << scanner.pos - 1 unless quoting
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end
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end
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if marks.empty?
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json
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else
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ranges = ([0] + marks.map(&:succ)).zip(marks + [json.length])
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ranges.map { |(left, right)| json[left..right] }.join(" ")
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end
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end
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end
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end
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end
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